Showing papers on "Acetone published in 1977"
TL;DR: Excess volumes of the binaries: acetone + benzene and acetone+ cyclohexane, and for the ternary, have been determined from density measurements at 298.15 K as discussed by the authors.
108 citations
TL;DR: In this paper, an asymmetric membrane was prepared from cellulose diacetate using a mixture of acetone and formamide, DMF, DMSO, NMP, dioxane or acetic acid as a basic solvent and water as the precipitation agent.
42 citations
TL;DR: In this paper, the hydrogenation of acetone in various solvents on Raney nickel was studied at different temperatures and concentrations, where the reaction rates were represented by a Langmuir-Hinshelwood type kinetic equation.
36 citations
TL;DR: The origin of the products of oxidation of propylene over polymolybdic surface sites of an MoO 3 · SiO 2 catalyst has been correlated to the oxidation states of molybdenum by studying the effects of temperature (380-440 °C), O 2 C 3 H 6 ratio (0.5-18), and dopants [Zn(II) and Na(I) ions] on overall conversion and selectivity in microreactor experiments, both in the presence and absence of steam as discussed by the authors.
33 citations
TL;DR: By a single measurement for acetone, all three ketone bodies are simultaneously determined and the clinical implications of this approach are extensive.
Abstract: We describe a one-step assay for total ketone bodies in serum. D-BETA-Hydroxybutyrate is enzymatically oxidized by NAD+ to acetoacetate. This thermodynamically unfavorable reaction is driven to completion by coupling it with the enzymatic reduction of pyruvate by NADH. The acetoacetate so formed, as well as the pre-existing acetoacetate, is quantitatively decarboxylated to acetone in a gas chromatograph and measured directly. Thus by a single measurement for acetone, all three ketone bodies are simultaneously determined. In light of the ubiquity of situations associated with augmented ketone body production, the clinical implications of this approach are extensive.
31 citations
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27 citations
Patent•
05 Aug 1977
TL;DR: Propylene oxide is separated from contaminating quantities of methanol and acetone by extractive distillation with water as mentioned in this paper, but it is not suitable for use in industrial applications.
Abstract: Propylene oxide is separated from contaminating quantities of methanol and acetone by extractive distillation with water.
24 citations
TL;DR: In this article, the infrared spectra of the adsorbed species produced by acetone on silica-supported Ni and Co have been obtained and the structure of the adaption is that of acetone coordinated through the oxygen atom.
23 citations
TL;DR: The α-methylene group of 1-alkylazulene side-chain is readily oxidized to carbonyl by treatment with DDQ in aq. acetone or dioxane as mentioned in this paper.
Abstract: The α-methylene group of 1-alkylazulene side-chain is readily oxidized to carbonyl by treatment with DDQ in aq. acetone or dioxane. The reaction provides a convenient method for the conversion of 1-alkylazulenes (1) into 1-acylazulenes (2).
21 citations
Patent•
08 Feb 1977
TL;DR: In this article, a phenylacetic acid derivative of formula I is allylated in the presence of a base in a solvent, e.g. acetone, to give a compound of formula III, which is then subjected to the Claisen rearrangement under heating at 100W300°C.
Abstract: NEW MATERIAL:A phenylacetic acid derivative of formula I (R 1 and R 2 are H or lower alkyl; M is carboxyl, carbamoyl, hydroxyaminocarbonyl or lower alkoxycarbonyl; A and B are H, lower alkyl or aryl). EXAMPLE: 3-(Thiazol-2-yl)-2-hydroxyphenylacetic acid. USE: Useful as a medicine having analgesic, anti-inflammatory, antipyretic, antithrombotic and antiallergic action, etc. with high safety. PROCESS: A compound of formula II is allylated in the presence of a base in a solvent, e.g. acetone, to give a compound of formula III, which is then subjected to the Claisen rearrangement under heating at 100W300°C. The reaction product is then alkylated with an alkyl halide in the presence of a base to afford a compound of formula IV, which is then oxidized in a mixed solvent of water with acetic acid in the presence of an oxidizing agent to give the compound of formula I . COPYRIGHT: (C)1984,JPO&Japio
20 citations
TL;DR: The substitution of acetone for ethanol, the elimination of chelating agents, and the addition of sodium hydroxide to gel preparations markedly reduced degradation of benzoyl peroxide.
Patent•
25 Aug 1977
TL;DR: In this article, a destillate is obtained containing as main components phenol, o- and p-isopropenyl-phenol and their dimers at yield of about 40-74% by weight calculated in relation to the initial amount of dian waste.
Abstract: The essence of the invention consists in heating the dian waste in the presence of sodium hypophosphite as a catalyst in amount of 001 - 05% by weight at a temperature of 150 to 250° C and under reduced pressure in the range of 5 to 50 mm Hg As a result a destillate is obtained containing as main components phenol, o- and p-isopropenyl-phenol and their dimers at yield of about 40-74% by weight calculated in relation to the initial amount of dian waste The distillate obtained was made up with fresh phenol or with phenol and acetone and brought into contact with strongly acid cation exchanger, such as Wofatit KPS, Zerolit 225, Wofatit OK-80, in consequence the o- and p-isopropenylphenol and their dimers reacted with phenol to obtain the dian, the latter being then separated by known methods
01 Aug 1977
TL;DR: In this article, an experimental device was described for the measurement at low pressure of different transport phenomena in membranes and water permeability was measured in 15 cellulose acetate membranes, using celluloseacetate with a degree of acetilation of 2.7.
Abstract: An experimental device is described for the measurement at low pressure of different transport phenomena in membranes. The water permeability was measured in 15 cellulose acetate membranes, using cellulose acetate with a degree of acetilation of 2.7. The manufacture of membranes was based on solutions of cellulose acetate in acetone, whose composition varied in the range of 35 to 110 mg of cellulose acetate in 25 cm2 of acetone. The maximal pressure difference was 50 cm of water and the temperatures were made to vary from 30 to 50°C. A significant correlation between temperature and permeability was found. This dependence can be described either by exponential or linear equations with practically the same degree of accuracy.
TL;DR: Ethanol replaces the acetone sometimes used as solvent for the 3,4-dimethylphenol reagent, so that spectral interference caused by acetone is eliminated and the time required for complete nitration of the reagent is reduced.
TL;DR: In this article, metal polyphthalocyanines, especially Fe,Cu-polyphthalocynine, were found to be useful oxidation catalysts for the selective formation of peracetic acid from acetaldehyde.
Abstract: Acetaldehyde was oxidized using metal polyphthalocyanines as catalysts. Metal polyphthalocyanines, especially Fe,Cu–polyphthalocyanine, were found to be useful oxidation catalysts for the selective formation of peracetic acid from acetaldehyde. The rate of oxidation was much affected by the nature of the solvents. The solvent is considered to take part in the initiation oxidation reaction in two ways: one is based on the prevention of the oxygen molecule from coordination with a metal polyphthalocyanine and subsequent activation, and the other is due to the solvation with the activated oxygen molecules on the catalyst. Preferable solvents were ethyl acetate, bromobenzene, benzene, and acetone.
TL;DR: Solubility measurements suggest that the interactions of the solvent mixtures with (NH 4 ) 2 CO 3 (or carbamate), rather than urea, are responsible for the variations in urea yield.
TL;DR: In this paper, the delayed S2 emission from the sulphite addition compound in 5 ml of the solution was measured in a MECA cavity; a hydrogen-nitrogen flame was used.
TL;DR: In this article, photolysis of tris(trimethylsilyl)phenylsilane (I) in the presence of acetone, diethyl ketone and cyclohexanone resulted in formation of the respective 2,2,2-trimmethylphenyldisilanyl enol ethers in moderate yields.
TL;DR: In this article, gas-liquid chromatography (GLC) was used to measure Henry's law constants for ethylene, ethane, carbon dioxide, sulfur dioxide, methyl chloride, vinyl acetate, isopropyl alcohol, methyl ethyl ketone, and acetone in liquid polyvinyl acetate.
Abstract: Gas-liquid chromatography (GLC) was used to measure Henry's law constants for ethylene, ethane, carbon dioxide, sulfur dioxide, methyl chloride, vinyl acetate, isopropyl alcohol, methyl ethyl ketone, and acetone in liquid poly(vinyl acetate) in the region 125 to 200°C. Retention-time differences were measured relative to nitrogen and corrections for nitrogen's finite solubility were applied; these corrections are significant when measuring the solubilities of sparingly soluble solutes by the GLC method. The effect of GLC column diameter is discussed.
TL;DR: In this article, the authors investigated the photolysis of triplet acetone in various solutions by analysis of reaction products as well as absorption spectroscopy and showed that intermolecular hydrogen abstraction plays a significant role in quenching the decaying process.
Abstract: The photolysis of acetone in various solutions has been investigated by analysis of reaction products as well as absorption spectroscopy. The rate of photolysis of acetone in aqueous solution decreases on addition of methanol or with increasing concentration of acetone, being much higher than that in methanol and heptane solutions. The results suggest that intermolecular hydrogen abstraction plays a significant role in quenching of triplet acetone. This is supported by spectroscopic studies which reveal formation of the enol form of acetone as an intermediate in the decay process of triplet acetone.
Patent•
18 Nov 1977
TL;DR: Cumene hydroperoxide in a solvent comprising phenol and acetone is decomposed using a soluble rhenium compound as discussed by the authors, which is used to decompose the solvent into a solution of pure phenolic acid and pure acetone.
Abstract: Cumene hydroperoxide in a solvent comprising phenol and acetone is decomposed to phenol and acetone using a soluble rhenium compound.
TL;DR: Sodium dodecyl sulfate polyacrylamide gel electrophoresis revealed that powders obtained by acetone drying of the pastes contained significantly higher amounts of monomeric albumin.
Abstract: Various lots of human serum albumin, prepared by the Cohn alcohol procedure, were assayed for polymer distribution after lyophilization or acetone drying of the albumin paste. Sodium dodecyl sulfate polyacrylamide gel electrophoresis revealed that powders obtained by acetone drying of the pastes contained significantly higher amounts of monomeric albumin.
Patent•
15 Dec 1977
TL;DR: In this article, a main column separates phenol from crude acetone, this fraction being removed overhead, and the crude phenol being removed as a sidestream fraction from the main column at a point in the column above the feed-point where the total concentration of acetophenone plus carbinol is less than 1,000 ppm.
Abstract: Crude phenol is recovered from CHP reaction products by continuously feeding to a main column separating in its uppermost section phenol from crude acetone, this fraction being removed overhead, and in the lower section crude phenol from higher boilers, including acetophenone and carbinol, the crude phenol being removed as a sidestream fraction from the main column at a point in the column above the feed-point wherein the total concentration of acetophenone plus carbinol is less than 1,000 ppm and the higher boiling compounds being removed as a base fraction.
Patent•
23 Dec 1977TL;DR: In this paper, a process for the recovery of 2,2-bis(4-hydroxyphenyl)propane from residues remaining after purification distillation of bisphenol-A produced from a condensation reaction of phenol and acetone is described.
Abstract: A process is disclosed for the recovery of 2,2-bis(4-hydroxyphenyl)propane, herein referred to as bisphenol-A, from residues remaining after purification distillation of bisphenol-A produced from a condensation reaction of phenol and acetone. The process comprises mixing the residues with phenol in the absence of acidic reagents to precipitate a bisphenol-A-phenol crystalline adduct and recovering bisphenol-A from the separated adduct.
Patent•
23 Dec 1977TL;DR: In this article, a process for the production of 2,2-bis(4-hydroxyphenyl) propane from by-products remaining after purification distillation of bisphenol-A produced from a condensation reaction of phenol and acetone is described.
Abstract: A process is disclosed for the production of 2,2-bis(4-hydroxyphenyl) propane, herein referred to as bisphenol-A, from by-products remaining after purification distillation of bisphenol-A produced from a condensation reaction of phenol and acetone. The process comprises mixing the by-products with phenol and adding anhydrous hydrogen chloride under superatmospheric pressure to the resulting mixture to isomerize those by-products isomerizable to bisphenol-A for subsequent recovery.
Patent•
05 Jul 1977
TL;DR: A mixture of polycyclic aromatic polycarboxylic acids that is substantially soluble in acetone and substantially solvable in water is described in this paper, and a process for preparing the mixture is described.
Abstract: A mixture of polycyclic aromatic polycarboxylic acids that is substantially soluble in acetone and substantially soluble in water and a process for preparing the mixture.
TL;DR: In this paper, the reaction of 2-acetoxy-3-oxoheptanoate with γ-bromo-β-methoxy-cis-crotonate in the presence of sodium ethoxide afforded diethyl 3methioxioxioxoxide-5-hydroxy-5valeryl-2-hexenedioate (7) in 65% yield.
Abstract: The reaction of ethyl 2-acetoxy-3-oxoheptanoate with γ-bromo-β-methoxy-cis-crotonate in the presence of sodium ethoxide afforded diethyl 3-methoxy-5-hydroxy-5-valeryl-2-hexenedioate (7) in 65% yield. Treatment of 7 with a dilute aqueous NaOH in acetone gave (±)-4-methoxy-6-valeryl-5,6-dihydro-2-pyrone, a key intermediate leading to pestalotin, in 41% yield.