Showing papers on "Sodium sulfite published in 2001"
TL;DR: To determine the oxygen-transfer capacities of small-scale bioreactors such as shaking flasks, test tubes, and microtiter plates, a noninvasive easy-to-use optical method based on sulfite oxidation has been developed.
Abstract: The growth of microorganisms may be limited by operating conditions which provide an inadequate supply of oxygen. To determine the oxygen-transfer capacities of small-scale bioreactors such as shaking flasks, test tubes, and microtiter plates, a noninvasive easy-to-use optical method based on sulfite oxidation has been developed. The model system of sodium sulfite was first optimized in shaking-flask experiments for this special application. The reaction conditions (pH, buffer, and catalyst concentration) were adjusted to obtain a constant oxygen transfer rate for the whole period of the sulfite oxidation reaction. The sharp decrease of the pH at the end of the oxidation, which is typical for this reaction, is visualized by adding a pH dye and used to measure the length of the reaction period. The oxygen-transfer capacity can then be calculated by the oxygen consumed during the complete stoichiometric transformation of sodium sulfite and the visually determined reaction time. The suitability of this optical measuring method for the determination of oxygen-transfer capacities in small-scale bioreactors was confirmed with an independent physical method applying an oxygen electrode. The correlation factor for the maximum oxygen-transfer capacity between the chemical model system and a culture of Pseudomonas putida CA-3 was determined in shaking flasks. The newly developed optical measuring method was finally used for the determination of oxygen-transfer capacities of different types of transparent small-scale bioreactors.
91 citations
TL;DR: Sodium sulfite was used to improve the separation of copper-activated sphalerite from pyrite in mildly alkaline pH conditions as discussed by the authors, which was mainly the result of the much larger depression of the flotation of pyrites than sphalersite, and was obtained by conditioning the minerals with oxygen and decreasing the time interval between sulfite and xanthate additions.
87 citations
TL;DR: The isolation of high-quality DNA from plants, especially woody plants, is often difficult and expensive, but new approaches are being developed to overcome this challenge.
Abstract: The isolation of high-quality DNA from plants, especially woody plants, is often difficult...
71 citations
TL;DR: The method is sensitive and requires little sample preparation in a wide concentration range and is used for quantitative analysis of ISDN in arterial plasma, synthetic serum and pharmaceutical dosage form.
50 citations
TL;DR: In this paper, the authors investigated the mechanism of the sulfur inclusion by analyzing for sulfur gold deposits produced under various experimental conditions and also by observing weight gains resulting from the adsorption of sulfur-containing species on gold using the quartz crystal microbalance (QCM) technique.
Abstract: The hardness of the soft gold electrodeposited from the thiosulfate-sulfite mixed ligand bath which we developed recently, has previously been found to increase with increasing sulfur content of the gold deposit. In the present study the mechanism of the sulfur inclusion was investigated by analyzing for sulfur gold deposits produced under various experimental conditions and also by observing weight gains resulting from the adsorption of sulfur-containing species on gold using the quartz crystal microbalance (QCM) technique. The results led us to conclude that the origin of the included sulfur is primarily the adsorbed Au(I)-thiosulfate species. (Au 2 S 2 O 3 ) ads , formed as an intermediate in the gold deposition reaction.
40 citations
TL;DR: Red wine contains phenolic substances that may delay the onset of atherogenesis by reducing peroxidative reactions and sodium sulfite is used as a preservative in foods and as an antioxidant in alcoholic beverages.
Abstract: High intake of fats is strongly correlated with high mortality from coronary heart disease. The lack of this correlation not seen in certain regions of France has been attributed to wine consumption (1). Red wine contains phenolic substances. The antioxidant properties of these compounds may delay the onset of atherogenesis by reducing peroxidative reactions. Sodium sulfite is used as a preservative in foods and as an antioxidant in alcoholic beverages. Sulfite is present in finished wines in concentrations up to ∼6 mmol/L. We measured the concentration of plasma sulfite in four healthy volunteers (males; age range, 28–37 years) before and after they drank a glass of wine (200 mL of a 1997 Bordeaux red wine containing ∼320 mg/L sodium sulfite). Each volunteer fasted for 12 h before the …
27 citations
Patent•
17 Apr 2001TL;DR: In this paper, the ion exchange technology was used to recover gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thio-sulfates leaching.
Abstract: Processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed. The processes include subjecting the gold-bearing and copper-bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an ion exchange resin. The ion exchange resin once loaded with gold and optionally copper is eluted with a mixture of sodium tetrathionate, ammonium thiosulfate and sodium sulfite. Gold and optionally copper are recovered from the eluate by electrowinning or precipitation.
22 citations
Patent•
30 Oct 2001TL;DR: In this paper, the use of a glycolic acid adduct of sodium sulfite as the reducing agent in the redox couple for polymerization of vinyl acetate polymer based emulsions for nonwoven binders which contain formaldehyde, primarily from the self-crosslinking co-monomer N-methylolacrylamide.
Abstract: The invention is the use of a glycolic acid adduct of sodium sulfite as the reducing agent in the redox couple for polymerization of vinyl acetate polymer based emulsions for nonwoven binders which contain formaldehyde, primarily from the self-crosslinking co-monomer N-methylolacrylamide.
18 citations
TL;DR: The proposed method was successfully applied to assay the MSB content in MSB injection and a detection limit of 0.38 microg l(-1) was achieved at a sampling rate of 90 h(-1).
Abstract: A flow-injection on-line photochemical spectrofluorometry (FI-PF) was developed for the determination of menadione sodium bisulfite (MSB) using acetone and sodium sulfite as sensitizing reagents. An injected sample band carried by a water stream was on-line merged with a mixed NaOH, Na2SO3 and acetone solution in a "T" connector. It was then driven to pass a knotted PTFE photochemical reactor (0.5 mm i.d. x 200 cm, KR) that was freely coiled around a 6-W low-pressure mercury lamp. While passing the KR, MSB was derived into an intensively fluorescent compound that was on-line delivered into a flow-through cell and detected therein at an emission wavelength of 459 nm and an excitation wavelength of 336 nm. Under optimized conditions a detection limit of 0.38 microg l(-1) was achieved at a sampling rate of 90 h(-1). Eleven determinations of 0.5 mg l(-1) and 0.05 mg l(-1) MSB standard solution gave RSDs of 0.75% and 1.3%, respectively. The calibration curve was linear in the MSB concentration range 0.005-1.5 mg l(-1). The proposed method was successfully applied to assay the MSB content in MSB injection.
9 citations
TL;DR: In this paper, the plasmon bands of metallic silver nanoparticles were identified and the kinetics of this process were determined under various conditions and Ag2S nanoparticles are found to be a highly active catalyst.
Abstract: Silver sulfide nanoparticles were found to catalyze the reduction of Ag+ ions by sodium sulfite and hydroquinone. The change in the absorption spectrum of the reaction mixtures was studied. New bands were found to arise at 403, 415, and 426 nm depending on the reaction conditions. These bands were identified as plasmon bands of metallic silver nanoparticles. The kinetics of this process was determined under various conditions and Ag2S nanoparticles were found to be a highly active catalyst.
8 citations
Patent•
24 Oct 2001
TL;DR: The efficient complexing water purifying agent consists of O-type component comprising aluminium sulfate, ferrous sulfate and water; K-type components comprising sodium hydroxide, sodium sulfite, sodium hypochlorate, polyacrylamide and water.
Abstract: The efficient complexing water purifying agent consists of O-type component comprising aluminium sulfate, ferrous sulfate, sulfuric acid and water; K-type component comprising sodium hydroxide, sodium sulfite, sodium hypochlorate and water; and C-type component comprising sodium sulfite, polyacrylamide and water. The water; purifying agent with scientific formulation possesses functions of pH regulation, oxidioreduction and flocculant precipitation, has the features of both inorganic and organic water purifying agent, and can purify various industry and domestic sewage effectively and fast.
TL;DR: In this article, the effects of triphaflavine, SDS, and thallium nitrate concentrations on pyrene-SRTP intensity, lifetime, and decay rate constants were studied.
Patent•
29 Aug 2001
TL;DR: In this paper, the aluminum pectinate solution is mixed with sodium sulfite or sodium bisulfite as decoloring agent at 60-90 deg.c through stirring for 20-60 min.
Abstract: The present invention relates to chemical extraction and refining technology. Orange peel, sunflower receptacle and beet pulp as material are first dealuminized with oxalic acid, citric acid or theirmixture, and the aluminum pectinate as intermediate is treated with 80-95% concentration alcohol at room temperature for 2-4 hr. During aluminium salt settling separation, mixed aluminium pectinate solution is mixed with sodium sulfite or sodium bisulfite as decoloring agent at 60-90 deg.c through stirring for 20-60 min. The present invention is easy to use in industry.
TL;DR: The first symmetrical bilirubin analog with CO2H groups replaced by SO3H, 8,12-bis-(2-sulfo-ethyl)-3,17-diethyl-2,7,13,18-tetramethyl-(10H,21H,23H,24H)-bilin-1,19-dione, was synthesized from methyl (2,4-dimethyl-5-ethoxycarbonyl-1H-pyrrol-3-yl) acetate in nine steps via the sulf
Abstract: The first symmetrical bilirubin analog with CO2H groups replaced by SO3H, 8,12-bis-(2-sulfo-ethyl)-3,17-diethyl-2,7,13,18-tetramethyl-(10H,21H,23H,24H)-bilin-1,19-dione, was synthesized from methyl (2,4-dimethyl-5-ethoxycarbonyl-1H-pyrrol-3-yl) acetate in nine steps via the sulfonic acid analog of xanthobilirubic acid (XBR) and isolated as its disodium salt. The sulfonic acid group was introduced at an early stage of the synthesis by reaction of an intermediate, ethyl 4-(2-bromoethyl)-3,5-dimethyl-1H-pyrrole-2-carboxylate, with sodium sulfite. The disodium bilirubin disulfonate exhibits NMR spectroscopic properties rather similar to those of the parent carboxylic acid, mesobilirubin-XIIIα; however, its UV/Vis spectra are blue-shifted and broadened relative to those of the parent compound. Like mesobilirubin, the disulfonate displays a positive exciton chirality circular dichroism spectrum, albeit with weaker Cotton effects, in a buffered aqueous solution (pH = 7.4) containing a 2:1 molar ratio of human serum albumin.
Patent•
02 Jul 2001
TL;DR: In this article, a sample solution containing ammoniacal nitrogen is allowed to flow down in a capillary for channels, at the same time, a reaction reagent is poured into the sample solution from a reagent solution injection port for mixing, a gas constituent being separated from a liquid phase is converted to nitrogen monoxide by a heating oxidation oven 8 in a gas-liquid separator such as a gas liquid separation tube 7 for supplying to a chemical light emission detector in a Chemical Light Emitting Emitting Device (CEE) section 10, and Chemical light emission intensity is
Abstract: PROBLEM TO BE SOLVED: To discharge drain being discharged from an ammonia measurement process to a peripheral environment without any obstruction. SOLUTION: In the measurement of ammonia, a sample solution containing ammoniacal nitrogen is allowed to flow down in a capillary for channels, at the same time, a reaction reagent is poured into the sample solution from a reagent solution injection port for mixing, a gas constituent being separated from a liquid phase is converted to nitrogen monoxide by a heating oxidation oven 8 in a gas-liquid separator such as a gas-liquid separation tube 7 for supplying to a chemical light emission detector in a chemical light emission section 10, and chemical light emission intensity is detected for measuring ammoniacal nitrogen concentration in the sample solution by a flow injection analysis method and a chemical light emission method. In this case, a reducing agent comprising sodium ascorbic acid, sodium thiosulfate, sodium sulfite, or L-sodium ascorbic acid is injected to waste liquid being discharged from the gas-liquid separator, thus removing remaining chlorine in the waste liquid.
TL;DR: Horseradish peroxidase utilizes molecular oxygen (O2) with sodium sulfite (Na2SO3) to oxidize thioanisole and styrene at the exterior of the heme pocket.
Patent•
14 Mar 2001
TL;DR: Sliced poplar is treated through water washing in washing machine, dewatering, preheating, high temperature digestion in water solution of sodium sulfite and water solution insidea digestion pipe, storing in buffering tower and pulp grinding in a pulp grinding machine to obtain poplar pulp Poplar pulp is sieved, washed to eliminate dregs, further washed in pretreating tower, first bleached for a certain period in the mixed solution of hydrogen peroxide, sodium hydroxide, sodium silicate and magnesium sulfate in a middle bleaching tower, and finally re
Abstract: Sliced poplar is treated through water washing in washing machine, dewatering, preheating, high temperature digestion in water solution of sodium sulfite and water solution of sodium hydroxide insidea digestion pipe, storing in buffering tower and pulp grinding in a pulp grinding machine to obtain poplar pulp Poplar pulp is sieved, washed to eliminate dregs, further washed in pretreating tower,first bleached for a certain period in the mixed solution of hydrogen peroxide, sodium hydroxide, sodium silicate and magnesium sulfate in a middle bleaching tower, and finally re-bleached in a high bleaching tower to produce poplar fluff pulp
Patent•
06 Apr 2001
TL;DR: In this article, a preparation method of canned crab and crab packed in a retort container is provided to store the crab food for a long time with maintaining the ingredients and nutrients and the unique color and flavor of the crab flesh with low cost.
Abstract: PURPOSE: A preparation method of canned crab and crab packed in a retort container is provided to store the crab food for a long time with maintaining the ingredients and nutrients and the unique color and flavor of the crab flesh with low cost. CONSTITUTION: The method includes the following steps: (i) taking off the shell of the crab and removing the inside inedible parts from the crab; (ii) cooking the prepared crab in boiling water for 5-7min(material 1) or heating the crab at 50-55deg.C for 5-7min (material 2)and separating the flesh part from the boiled crab; (iii) heating the second material in boiling water for 2-3min; (iii) soaking the first material in a 1.5% mixed solution of Sodium Tripolyphosphate, Sodium metaphosphate, Pyrophosphates, Sodium Acid Pyrophosphate, Sodium Citrate, citric acid, BHA, Sodium hyposulfite and EDTA for more than 4hr to remove discoloration causing materials in the crab; (iv) steeping the first material and the second material in a 1.2% solution of Sodium metaphosphate, Sodium Tripolyphosphate, Sodium Acid Pyrohosphate, L-Tryptophan, Sodium Erythorbate, Sodium sulfite and Phytic acid for 5min ; (v) putting the prepared crab in a container made of synthetic resins for retort or nonferrous metals and adding a fixed amount of flavoring matters to the product; and then (vi) sterilizing the resulting packed crab food at 98-100deg.C for 100-120 or at 110deg.C for 60min.
Patent•
20 Feb 2001
TL;DR: In this article, the adsorption purification of gasolines is carried out with activated carbon-fiber materials with applied cobalt phthalocyanine, and the regenerated adsorbent is washed with hydrocarbon to remove disulfides, after which adsorbed oxygen is removed via sodium sulfite solution treatment.
Abstract: gasoline production. SUBSTANCE: adsorption purification of gasolines is carried out with activated carbon-fiber materials with applied cobalt phthalocyanine. Mercaptan-saturated adsorbent is regenerated by oxidation of mercaptans with oxygen-containing gas in presence of alkali at 50 to 80 C. The thus regenerated adsorbent is washed with hydrocarbon to remove disulfides, after which adsorbed oxygen is removed via sodium sulfite solution treatment. EFFECT: increased degree of purification of adsorbent under long operation conditions. 2 cl, 2 tbl
Patent•
29 Jun 2001
TL;DR: In this article, a cyanide-free gold substitution plating solution is proposed, which can perform gold substitution on an electroless nickel-boron plated film or an electrolytically plated sheet of nickel, to impart it adequate adhesiveness and solderability.
Abstract: PROBLEM TO BE SOLVED: To provide a cyanide-free gold substitution plating solution, which can perform gold substitution plating even onto an electroless nickel-boron plated film or an electrolytically plated film of nickel, to impart it adequate adhesiveness and solderability. SOLUTION: The gold substitution plating solution includes gold sodium sulfite or ethylenediamine complex of gold sodium sulfite of 0.01-1.0 g/L in terms of gold concentration, sulfite of 10-100 g/L, organic carboxylic acid or a salt thereof of 5-50 g/L, and ethylene diamine tetraacetic acid or a salt thereof of 5-50 g/L, and has pH of 4.5-6.0 of a weak acid region.
Patent•
01 Aug 2001
TL;DR: In this article, a process for preparing sodium sulfite from liquid hydrocarbon or waste alkaline solution of gasoline is described, which includes the mixed gas of SO2 generated by combustion of sulfur to the bottom of absorption twoer I, spraying 3-10% solution of sodium hydroxide, and stirring the liquid from absorption tower I with ferrous sulfate or zinc sulfate.
Abstract: A process for preparing sodium sulfite from liquid hydrocarbon or waste alkaline solution of gasoline includes introducing the mixed gas of SO2 generated by combustion of sulfur to the bottom of absorption twoer I, spraying said waste alkaline solution from tower top for neutralizing, burning the tail gas of said tower to generate gas containing SO2, introducing it to the bottom of absorption tower II, spray 3-10% solution of sodium hydroxide, and stirring the liquid from absorption tower I with ferrous sulfate or zinc sulfate.
Journal Article•
TL;DR: In this article, a novel synthesis route of 2-chloro-4-(methylsulfonyl)benzoic acid was set up for increasing its purity and rate of production.
Abstract: The novel synthesis route of 2-chloro-4-(methylsulfonyl)benzoic acid was set up for increasing its purity and rate of production.
Patent•
27 Oct 2001
TL;DR: In this paper, a part of sample is distilled off in presence of alkali and two distillate portions are sampled The two portions are treated with sulfuric acid at heating on boiling water bath for 5-7 min.
Abstract: analytical methods SUBSTANCE: preliminarily, a part of sample is distilled off in presence of alkali and two distillate portions are sampled The two portions are treated with sulfuric acid at heating on boiling water bath for 5-7 min, after which one portion is consecutively treated with solutions of potassium permanganate, sodium sulfite, chromotrope acid, and concentrated sulfuric acid, whereas the second portion is treated with chromotrope acid solution and concentrated sulfuric acid Concentration of methanol is calculated from results of photometric measurements of solutions of the two sample portions taking into account coefficient reflecting multiplicity of decrease of formaldehyde concentration during treatment of the first sample portion EFFECT: increased measurement accuracy 2 cl, 4 ex
Patent•
11 Jul 2001
TL;DR: A pre-treating process for the electrolytic regeneration of sodium hydroxide as desulfurizing agent features that the waste water containing sodium sulfite and sodium hydrogen sulfite after desulfURizing fume is aerated to generate sodium sulfate and then electrolytically regenerated as mentioned in this paper.
Abstract: A pre-treating process for the electrolytic regeneration of sodium hydroxide as desulfurizing agent features that the waste water containing sodium sulfite and sodium hydrogen sulfite after desulfurizing fume is aerated to generate sodium sulfate and sodium hydrogen sulfate, and then electrolytically regenerated Its advantages are combining desulfurizing washing with electrolytic regeneration, easy control, high reliability and high economical value of by-product
Patent•
09 Oct 2001
TL;DR: In this paper, a method for producing dried persimmon without requiring any special equipment was proposed, which is capable of easily preventing them from getting black and moldy, and to obtain the desired result.
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing dried persimmon, needing no special equipment, and capable of easily preventing them from getting black and moldy, and to obtain dried persimmon by the above method. SOLUTION: This method for producing dried persimmon comprises the following practice: persimmon 1 is skinned into the corresponding skinned persimmon 2, which is soaked in a solution 10 prepared by mixing 100 g of water 13 with 0.9-1.1 g of sodium sulfite 11 and 1.2-1.5 g of citric acid 12 and then dried; wherein in the solution 10, the sodium sulfite 11 and the citric acid 12 are reacted with each other to form sulfurous acid, which is absorbed into the surface layer of the skinned persimmon 2 soaked in the solution 10; since the sulfurous acid has strong reducing effect as an aqueous sulfurous acid solution, the oxidative action by the oxygen in the skinned persimmon 2's flesh can be inhibited, thereby preventing the skinned persimmon 2 from getting black and also preventing growth of microorganisms such as mould; furthermore, since the respective concentrations of the sodium sulfite and the citric acid are appropriate, the objective dried persimmon 3 not getting black and moldy can be produced without exceeding the standard specified for the above chemicals as food additives.
Patent•
23 Oct 2001
TL;DR: In this paper, the authors proposed a method of producing hydrogen from a sulfur-containing material such as hydrogen sulfide discharged from a desulfurization process or contained in natural gas and existing abundantly as a raw material by a novel reaction.
Abstract: PROBLEM TO BE SOLVED: To provide a method of producing hydrogen from a sulfur-containing material such as hydrogen sulfide discharged from a desulfurization process or contained in natural gas and existing abundantly as a raw material by a novel reaction. SOLUTION: Hydrogen is produced by irradiating an inorganic sulfur compound ion aqueous solution such a an aqueous solution of sodium sulfide, sodium sulfite or the like with ultraviolet ray to reduce water.
Patent•
07 Aug 2001
TL;DR: In this paper, the authors presented an innovation dealing with antimicrobial preparations applied for treating purulent-necrotic lesions of limbs in cattle and methods for their applications, including antimicrobial substance of tetracyclines' group represented by foundation's oxyteteracycline salt, and additionally, the preparation contains Novocain, sodium sulfite (or sodium formaldehyde sulfoxylate), magnesium chloride, polyvinyl alcohol, propylene glycol and distilled water at the following ratio of components, g/l solution: oxytetracyCLine hydro
Abstract: FIELD: veterinary science SUBSTANCE: the present innovation deals with antimicrobial preparations applied for treating purulent-necrotic lesions of limbs in cattle and methods for their applications The suggested preparation includes antimicrobial substance of tetracyclines' group represented by foundation's oxyteteracycline salt Moreover, additionally, the preparation contains Novocain, sodium sulfite (or sodium formaldehyde sulfoxylate), magnesium chloride, polyvinyl alcohol, propylene glycol and distilled water at the following ratio of components, g/l solution: oxytetracycline hydrochloride 120-160, novocaine 15- 25, sodium sulfite or sodium formaldehyde sulfoxylate 40-60, magnesium chloride 12-16, polyvinyl alcohol 30-40, propylene glycol 80-120, distilled water the rest Method for treating purulent-necrotic lesions of limbs in cattle deals with introducing medicinal preparation at the dosage of 1 ml/7 kg body weight twice at 7-d-long interval into affected limb, moreover, injection should be performed into soft tissues of affected limb being above lesion site into several points The present innovation enables to shorten terms of recovery by 15 times and increase efficiency of therapy by 1164-181% EFFECT: higher efficiency of therapy 3 cl
Patent•
25 Jul 2001
TL;DR: In this paper, a salt removal agent composite and method for removing salt using thereof to prevent environmental pollution and damage due to reclaimed coal ash wastes by reusing dumped coal ash to the utmost, to reduce cost in accordance with making new reclaimed land.
Abstract: PURPOSE: Disclosed are a salt removal agent composite and method for removing salt using thereof to prevent environmental pollution and damage due to reclaimed coal ash wastes by reusing dumped coal ash to the utmost, to reduce cost in accordance with making new reclaimed land. CONSTITUTION: The salt removal agent composite comprises 8-15 wt% of sodium sulfite, 3-10 wt% of sodium thiosulfate, 1-4 wt% of sodium bisulfate, 3-9 wt% of sodium formate, 65-85 wt% of water for total composite.
15 Apr 2001
TL;DR: InChIKey as mentioned in this paper, a mixture of copper(I) chloride and tetrabutylammonium chloride is used for halogen exchange of halonitrobenzenes, and the resulting dichlorocuprate salt is extracted into CH2Cl2 and purified by recrystallization.
Abstract: [39926-94-8] C16H36Cl2CuN (MW 376.92)
InChI = 1S/C16H36N.2ClH.Cu/c1-5-9-13-17(14-10-6-2,15-11-7-3)16-12-8-4;;;/h5-16H2,1-4H3;2*1H;/q+1;;;+1/p-2
InChIKey = YIUUANLZYOKQPA-UHFFFAOYSA-L
(homogeneous catalyst for rearrangement of propargyl chlorides to allenyl chlorides;2 reagent for halogen exchange of halonitrobenzenes1)
Alternate Name: copper(I) chloride–tetra-n-butylammonium chloride.
Physical Data: mp 71–72 °C.
Solubility: sol haloalkanes, haloarenes, ketones, and other polar solvents; poorly sol alkanes.
Preparative Methods: in situ complexation of freshly prepared Copper(I) Chloride by tetrabutylammonium chloride in appropriate solvent (acetone, chloroform, etc.);2 pure material can best be prepared by reduction of Copper(II) Sulfate pentahydrate in aqueous solution with sodium sulfite or ascorbic acid in the presence of tetrabutylammonium hydrogen sulfate and sodium chloride, in the molar ratio 1∶2∶1∶4. The resulting dichlorocuprate salt is extracted into CH2Cl2 and may be purified by recrystallization.3
Purification: the CH2Cl2 solution of the reagent may be dried, the solvent evaporated, and the residue recrystallized from ethyl acetate to yield colorless crystalline rhombic plates.
Handling, Storage, and Precautions: the solid cuprate salt is stable to short-term exposure to air, but should be used immediately or stored under an inert atmosphere.
15 Apr 2001
TL;DR: InChIKey as mentioned in this paper, a mixture of 30% H2O2 and 30% Hydrogen Peroxide (49 mmol) is added to a stirred solution of Tris(acetylacetonate)iron(III) (2.7 mmol), and substrate (0.26 mmol) in acetonitrile.
Abstract: (Fe(acac)3) [14024-18-1] C15H21FeO6 (MW 353.21)
InChI = 1S/3C5H8O2.Fe/c3*1-4(6)3-5(2)7;/h3*3,6H,1-2H3;/q;;;+3/p-3/b3*4-3-;
InChIKey = AQBLLJNPHDIAPN-LNTINUHCSA-K
(H2O2) [7722-84-1] H2O2 (MW 34.02)
InChI = 1S/H2O2/c1-2/h1-2H
InChIKey = MHAJPDPJQMAIIY-UHFFFAOYSA-N
(β-epoxidation of cholesterol derivatives;2 trans-epoxidation of alkenes3)
Alternate Name: tris(acetylacetonate)iron(III)–hydrogen peroxide.
Physical Data: Fe(acac)3: mp 184 °C, d 1.33 g cm−3.
Solubility: slightly sol cold and hot water; sol alcohol, acetone, benzene, chloroform.
Form Supplied in: dark red powder; widely available.
Preparative Method: reagent combination is generated in situ, via dropwise addition of 30% Hydrogen Peroxide (49 mmol) to a stirred solution of Tris(acetylacetonato)iron(III) (2.7 mmol), and substrate (0.26 mmol) in acetonitrile.2, 3
Handling, Storage, and Precautions: use in a fume hood. Fe(acac)3 causes severe eye irritation and may cause skin irritation. Toxic fumes of carbon monoxide and carbon dioxide are generated on decomposition. It is incompatible with strong oxidizing agents; thus the H2O2 has to be used in excess because it is decomposed by FeIII ion.4 Reactions should be worked up by decomposition of excess H2O2 with saturated aqueous sodium sulfite and then extraction of product with ether. See also Hydrogen Peroxide.