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Showing papers on "Acetone published in 1972"


Journal ArticleDOI
TL;DR: An analytical procedure for these pigments has been developed, based upon this extraction sequence, followed by partition of the acetone extract between hexane and aqueous acetone.
Abstract: Dimethyl sulfoxide (DMSO) rapidly extracts much of the chlorophyll c and fucoxanthin from the intact thalli of brown algae. Subsequent extraction by acetone rapidly removes most of the chlorophyll a and β-carotene. An analytical procedure for these pigments has been developed, based upon this extraction sequence, followed by partition of the acetone extract between hexane and aqueous acetone. Fucoxanthin and chlorophyll c can be recovered from the DMSO extract and the aqueous acetone phase by extraction into ethyl acetate and subsequent evaporation. The DMSO-acetone extraction sequence is also effective with green algae and a few red algae, although the full scope of the method has not been investigated.

217 citations


Journal ArticleDOI
TL;DR: Long chain N-acylglutamic acid was prepared in a high yield by a reaction of glutamic acid with fatty acid chloride in a mixed solvent of water and a water miscible organic solvent.
Abstract: Long chain N-acylglutamic acid was prepared in a high yield by a reaction of glutamic acid with fatty acid chloride in a mixed solvent of water and a water miscible organic solvent such as acetone, methyl ethyl ketone, dioxane, tetrahydrofuran,t-butyl alcohol or cyclohexanone. In this reaction the composition of the mixed solvent influenced the yield of N-acylated glutamic acid and the best yield was obtained when the reaction was carried out in the mixed solvent comprising 30–60% v/v of the organic solvent. Long chain N-acylaspartic acid was also obtained in a high yield by the same method. As the other method to obtain N-lauroyl-D L-glutamic acid, it was examined that N-acyl-α-aminoglutarodinitrile which was obtained by a reaction of α-aminoglutarodinitrile with fatty acid chloride was hydrolyzed with an aqueous alkaline solution. The salts of long chain N-acylglutamic acid are known as the surface active agents that react mildly on the human skin.

66 citations


Journal ArticleDOI
TL;DR: In this paper, the parent aldehyde or ketone is converted into the parent ketone in good yield either by methyl iodide in moist acetone or by methyl fluorosulphonate and water in liquid sulphur dioxide.
Abstract: Thioacetals are converted into the parent aldehyde or ketone in good yield either by methyl iodide in moist acetone or by methyl fluorosulphonate and water in liquid sulphur dioxide.

54 citations




Journal ArticleDOI
TL;DR: In this article, the amount of acidic sites of a series of SnO 2 MoO 3 binary oxides was determined by n -butylamine titration and correlated to the catalytic activity to form acetone in the oxidation of propylene.

39 citations


Journal ArticleDOI
TL;DR: This work has shown that aniline, a well-known type II substrate, can also interact with the type I binding site of cytochrome P-450, and elicited a spectral change with rat liver microsomes resembling a type II difference spectrum.
Abstract: 1. Acetone (0.8 M) enhanced the p-hydroxylation of aniline about 3-4 fold when added to the incubation mixture. Only inhibition in hydroxylation of 3,4-benzpyrene or N-demethylation of ethylmorphine was observed.2. Phospholipase C treatment of rat liver microsomes decreased aniline p-hydroxylation about 20%. The enhancing action of acetone vanished after such a treatment.3. Acetone diminished the type II binding of aniline. In the presence of acetone, low concn. of aniline produced a type I difference spectrum with rat hepatic microsomes. With higher concn. of aniline a type II spectral change was obtained. This indicates that aniline, a well-known type II substrate, can also interact with the type I binding site of cytochrome P-450. Correlation between the type I spectral change and activation of aniline p-hydroxylation is suggested. Acetone itself elicited a spectral change with rat liver microsomes resembling a type II difference spectrum.4. Acetone partly reversed the inhibition produced by aniline on...

38 citations


Journal ArticleDOI
TL;DR: With this method, concentrations from 1 μM could be measured accurately, which is particularly convenient for biological analyses, and if samples of acetoacetate and β-hydroxybutyrate are to be stored, the transformation of the respective substances to acetone should be carried out on the day of sampling.

32 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of selective adsorption has been assessed and an adorption inversion has been detected and the mechanism of cosolvency is then discussed in relation to the selective adaption and the excess free energy of mixing of the two liquid components.

31 citations


Patent
15 May 1972
TL;DR: In this article, the authors describe the use of free-flowing, free-flowing POWDers, having little or no ELECTROSTATIC CHARGE reaction and being completely free from the Internet.
Abstract: DRY, FREE-FLOWING POWDERS HAVING LITTLE OR NO ELECTROSTATIC CHARGE REACTION AND SUBSTANTIALLY FREE FROM WEBBEING ARE OBTAINED BY A PROESS WHICH COMPRISES THE STEPS OF: (1) PREPARING AN ACETONE SOLUTION OF AN ACRYLIC POLYMER, WHICH SOLUTION HAS A VISCOSITY OF LESS THAN ABOUT 13 SECONDS ($4 FORD CUP) AND THE RATIO OF ACETONE TO OTHER ORGANIC SOLVENTS IS AT LAST 3, (2) ADDING TO THE PRODUCT OF STEP (1) FROM 3 TO ABOUT 10 PERCENT ATER, BASED ON THE VOLUME OF ACETONE EMPLOYED, AND (3) SPRAY-DRYING THE PRODUCT OF STEP (2). THE POWDERS THUS OBTAINED ARE USEFUL AS COATING POWDER COMPOSITIONS WHICH CAN BE APPLIED BY EITHER ELECRROSTATIC SPRAYING OR FLUIDIZED BEADS, WITH EXCELLENT RESULTS.

30 citations


Journal ArticleDOI
TL;DR: The route of oxygen incorporation into oxidized products has been studied in the heterogeneous oxidation of propylene by molecular oxygen over stannic oxide combined with molybdenum trioxide in the presence of [ 18 O]H 2 O tracer as discussed by the authors.

Journal ArticleDOI
TL;DR: In this article, a number of lithium and sodium salts in acetone and in tetrahydrofuran solutions in the 0·01-0·15 M concentration range were determined for a series of properties.

Journal ArticleDOI
TL;DR: In this article, it was shown that the selectivity and activity of the catalysts are determined by the basic and acidity of the catalyst, and that the conversion to propionaldehyde is proportional to the acidity.
Abstract: The isomerization of propylene oxide was carried out on metal phosphate catalysts. The main products were allyl alcohol, propionaldehyde, acetone, and 1-propanol. It was found that allyl alcohol is produced by acid-base bifunctional catalysts, acetone, by basic-site catalysts only, and propionaldehyde, by acid-site catalysts. 1-Propanol may be produced by the hydrogen-transfer reaction of allyl alcohol. The conversion to propionaldehyde is proportional to the acidity of the catalyst, the strength of which is stronger than H0=+4.8. The sum of the conversions to allyl alcohol, acetone, and 1-propanol correlate linearly with the observed basicity (H0≥+7.2) of the catalyst. The selectivity and activity are determined by the basic and acidic properties of the catalyst. The mechanisms of the propylene oxide isomerization are also discussed.

Journal ArticleDOI
TL;DR: In this article, the selectivity and activity of propylene oxide isomerization have been investigated over zeolite catalysts at 100°C, and it has been found that the acid strength of a catalyst is a dominant factor in the selectivities and activity.
Abstract: The selectivity and activity of propylene oxide isomerization have been investigated over zeolite catalysts at 100°C. It has been found that the acid strength of a catalyst is a dominant factor in the selectivity and activity. The stronger the acid strength, the larger the ratio of acetone to propionaldehyde. The reaction intermediates are deduced to be a propylene oxide protonated or that adsorbed on a Lewis-acid site. It has also been found that, in the cases of HY, Silnex (SiO2), and HY treated with pyridine, the selectivity and activity correlate with the strength of the interaction between the propylene oxide and the surface hydroxyl group. Moreover, it has been clarified that the H0 value of the surface hydroxyl group observed at 3660 cm−1 on HY is −8.2–−5.6, while that found at 3540 cm−1 is +4.0–+4.8.

Journal ArticleDOI
TL;DR: In this article, a method for the estimation of standard chemical potential differences (Δμ°) of single ions for the transfer from one solvent to another, described previously, is further improved and applied to the transfer of water to acetone and acetone-water mixtures.
Abstract: A method for the estimation of standard chemical potential differences (Δμ°) of single ions for the transfer from one solvent to another, described previously, is further improved and applied to the transfer from water to acetone and acetone-water mixtures. With some reservation a value of the surface potential χ of acetone is derived.

Journal ArticleDOI
TL;DR: In this paper, the vapor pressure and vapor composition of the methanol-cyclohexane system were investigated at temperatures ranging from 25 to 50° and the same properties of the binary systems: acetone-methanol and...
Abstract: The vapor pressure and vapor composition of the methanol–cyclohexane system were investigated at temperatures ranging from 25 to 50°. The same properties of the binary systems: acetone–methanol and...

Journal ArticleDOI
TL;DR: The reactions of the acetone and acetyl cation with acetone have been investigated in a photoionization mass spectrometer and two reaction channels are observed.
Abstract: SIECK, L. W., AND AUSLOOS, P. Reactions of the Acetone Cation. Implications for the Radiolysis of Acetone. Radiat. Res. 52, 47-58 (1972). The reactions of the acetone and acetyl cation with acetone have been investigated in a photoionization mass spectrometer. Reaction of the acetone cation with ?-<0.3 eV internal energy occurs essentially at every collision (k = 8.4 X 10-10 ml/molecule sec), but decreases slightly with an increase in internal energy. Two reaction channels are observed for the acetone

Journal ArticleDOI
TL;DR: In this article, the reactions of various olefins were compared over supported Ir catalysts, and the rates of total oxidation decreased in the order given, while the corresponding activation energies increased.

Journal ArticleDOI
TL;DR: In this paper, the density, dielectric constant, change of volume on mixing, refractive index, surface tension, and viscosity of the methanol-cyclohexane system have been investigated experimentally at temperatur...
Abstract: The density, dielectric constant, change of volume on mixing, refractive index, surface tension, and viscosity of the methanol–cyclohexane system have been investigated experimentally at temperatur...

Journal ArticleDOI
TL;DR: In this paper, the Astragalus cibarius Sheld was extracted with acetone and purification by silica gel chromatography of the residue from the acetone extract yielded a colorless, crystalline compound, m.p. 122°.


Journal ArticleDOI
TL;DR: In this article, the mechanism of the action of SrO2, CaO 2, SrCO3, barium formate and barium oxalate used as additives to silver catalysts (2 −20 mole %) in the oxidation of ethylene to ethylene oxide and CO2 + H2O has been studied.


Journal ArticleDOI
TL;DR: In this article, the integrated intensity of the OD band of HDO in water-dioxane, -acetone, -tetrahydrofuran and -methyl cyanide mixtures was investigated.


Journal ArticleDOI
TL;DR: Oppenauer oxidation constitutes a mild, often selective, procedure for the conversion of alcohols to aldehydes or ketones as mentioned in this paper, and in many instances a ketone higher boiling than acetone must be used to facilitate the reaction.

Journal ArticleDOI
TL;DR: In this paper, the Osmium (VIII) catalyzed oxidation of acetone and ethylmethyl ketone by chloramine-T, in highly alkaline solutions showed first order dependence to chloramine and osmium.
Abstract: The Osmium (VIII) catalyzed oxidation of acetone and ethylmethyl ketone by chloramine-T, in highly alkaline solutions showed first order dependence to chloramine-T and osmium (VIII). The order of the reactions with respect to alkali and ketone were found to be fractional, being ~-0.82 and 0.3 respectively. No effects of ionic strength were evident. The mechanism has been proposed on the basis of the formation of a complex between N-chlorotoluene-p-sulfonamide and osmium (VIII) in the slow step, which in turn oxidizes the enol anion of the reducing substrate in the fast step. During the study of the mechanism of oxidations by chloramine-T, the kinetics of the oxidation of α-hydroxy acids 1 in presence of osmium (VIII) as catalyst, glycerol2 in neutral and alkaline media, p-cresol3 in an acidic medium, hexacyanoferrate (II)4 in a feebly acidic medium (pH 6-7) and aliphatic aldehydes 5 in alkaline media have been investigated. Despite the high redox potential6 of the chloramine-T/toluene sulfonamide system (1.138 V at pH 12), the oxidation of acetone does not take place in absence of catalyst and that of ethylmethyl ketone proceeds only in highly alkaline solutions7 (NaOH>0.01 M). In the present note the kinetics of the osmium (VIII) catalyzed oxidation of acetone and ethylmethyl ketone have been recorded.

Patent
D Duchane1
21 Aug 1972
TL;DR: In this paper, a BINDER MIXTURE is used to connect a non-woven web platform with an ORGANIC ACID in the presence of an ALKALINE BORATE.
Abstract: A STABILIZED HIGH SOLIDS CONTENT BINDER MIXTURE FOR BONDING NON-WOVEN WEBS TO PROVIDE A WATER-FLUSABLE WRAPPER FOR ABSORBENT PADS SUCH AS SANITARY MAPKINS, DIAPERS AND THE LIKE. THE MIXTURE COMPRISES AN ACIDFIED SOLUTION OF COLD-WATER SOLUBLE POLYVINYL ALCOHOL CONTAINING AN ALKALINE BORATE AND A RELATIVELY UNSTABLE ORGANIC ACID. THE ORGANIC ACID TEMPORARILY ACIDIFIES THE SOLUTION TO PERMIT THE POLYVINYL ALCOHOL TO BE UTILIZED IN A RELATIVELY HIGH SOLIDS CONCENTRATION IN THE PRESENCE OF ALKALINE BORATE WITHOUT PREMATURE GELLING. SUITABLE ORGANIC ACIDS INCLUDE ACETOACETIC ACID AND ACETONE DICARBOXYLIC ACID/ AFTER THE BINDER MIXTURE IS APPLIED TO A NON-WOVEN WEB, THE HEAT USED IN DURING BREAKS DOWN THE ORGANIC ACID INTO ACETONE AND CARBON DIOXIDE. THE DECOMPOSITION OF THE ACID AND SUBSEQUENT ESCAPE OF ITS CONSTITUENTS TO THE ATMOSPHERE RAISES THE PH OF THE MIXTURE WHEREBY THE BORAX CROSS-LINKS WITH THE POLYVINYL ALCOHOL TO RENDER IT TEMPORARILY INSOLUBLE.

Journal ArticleDOI
TL;DR: In this paper, the effects of dehydroacetic acid, methyl cis-3-acetoxycrotonate, and diketene on the asymmetric activity of catalysts modified with L-amino acids were examined in the hydrogenation of methyl acetoacetate.
Abstract: Dehydroacetic acid and methyl cis-3-acetoxycrotonate were picked out as trace impurities of the substrate, methyl acetoacetate. The effects of dehydroacetic acid, methyl cis-3-acetoxycrotonate, and diketene, which is the starting material for the preparation of methyl acetoacetate, on the asymmetric activities of catalysts modified with L-amino acids were examined in the hydrogenation of methyl acetoacetate. The above three compounds, when added to the hydrogenation system, raised the asymmetric activity of the catalyst. Also, simple unsaturated compounds, such as acetone and diethyl maleate, has a similar effect on the catalyst. The effects of the above unsaturated compounds on the asymmetric activities of the catalysts modified with L-amino acids were discussed, and it was suggested that the unsaturated compounds adsorb on the catalyst surface and might scavenge the asymmetrically uncontrolled active hydrogen absorbed on the catalyst surface.

Patent
18 Sep 1972
TL;DR: In this paper, azeotropes of 1-chloro-2, 2,2,2-trifluoroethyl difluoromethyl ether and acetone, methyl ethyl ketone or tetrahydrofuran are formed and used to separate this ether from 1-closeto-2.2.
Abstract: Azeotropes of 1-chloro-2,2,2-trifluoroethyl difluoromethyl ether and acetone, methyl ethyl ketone or tetrahydrofuran are formed and used to separate this ether from 1-chloro-2,2,2trifluoroethyl difluorochloromethyl ether.