Showing papers on "Acetone published in 1973"
TL;DR: In this article, the photocatalytic oxidation of isopropanol has been studied in a specially designed rotating reaction vessel affording good contact between the incident uv light and the powdered photocatalyst.
160 citations
TL;DR: In this article, the rate constants of triplet quenching are derived and the pathways of deactivation for triplet acetone in solution are discussed, as well as the quantum yields of acetone disappearance.
Abstract: Kinetic studies of the absorption and emission of triplet acetone and the absorption of the ketyl radical, following flash excitation of acetone in a variety of solvents, are reported as well as the quantum yields of acetone disappearance.Rate constants of triplet quenching are derived and the pathways of deactivation of triplet acetone in solution are discussed.
78 citations
48 citations
TL;DR: In this article, the enol of 3-hydroxy-3-methyl-2-butanone was detected by NMR, spectroscopy during photoreactions of 3 -hydroxy 3-methyl 2 butanone in acetonitrile and 2-propanol.
Abstract: The enol of acetone, formed by disproportionation reactions of 1-hydroxy-1-methylethyl radicals, is detected by NMR, spectroscopy during photoreactions of 3-hydroxy-3-methyl-2-butanone in acetonitrile and of acetone in 2-propanol and slowly tautomerizes to acetone. The photolysis of 3-hydroxy-3-methyl-2-butanone is shown to proceed via Type I cleavage, predominantly from an excited triplet state.
42 citations
38 citations
TL;DR: In this article, neutral constituents of volatiles in the ether extract of cultured broth of Sporobolomyces odorus AHU 3246 were analyzed by gas chromatography-mass spectrometry and other methods.
Abstract: Neutral constituents of volatiles in the ether extract of cultured broth of Sporobolomyces odorus AHU 3246 were analyzed by gas chromatography-mass spectrometry and other methods.Identified compounds were as follows: Methyl, ethyl, isobutyl, n-butyl, isoamyl, n-amyl, benzyl, and β-phenylethyl alcohol; formaldehyde, acetaldehyde, benzaldehyde, phenyl-acetaldehyde, acetone, and methyl ethyl ketone; ethyl formate, ethyl acetate, and di-n-butyl phthalate; γ-decalactone (4-decanolide) and 4-hydroxy-cis-dodecenoic acid γ-lactone (cis-6-dodecen-4-olide). Di-n-butyl phthalate and parts of methyl, ethyl, and n-butyl alcohol and ethyl acetate were thought to be contaminants. γ-Lactones produced by the yeast were determined by GLC.Although nine strains of six species of carotenoid pigment accumulating yeasts were cultured under the same conditions, neither flavorful smelling nor γ-lactone production detected in their cultured broths.
36 citations
TL;DR: In this article, the enthalpies of mixing and total and partial vapour pressures of methanol + acetone, carbon disulphide+ acetone (CDE) and other mixing agents have been determined.
31 citations
TL;DR: Aminotriazole plus isopropanol, 18 h prior to a challenging dose of CCl4, reduced the isoprostanol-enhanced response of Ccl4; serum glutamic–pyruvic transaminase (SGPT) activities were less than those found for isoproanol plus CCl 4; Hepatic triglyceride content also reflected reduced hepatotoxicity.
Abstract: The effect of aminotriazole on (1) isopropanol- and acetone-induced potentiation of CCl4 hepatotoxicity, and (2) the in vivo metabolism of isopropanol and acetone was studied in rats. Aminotriazole plus isopropanol, 18 h prior to a challenging dose of CCl4, reduced the isopropanol-enhanced response of CCl4; serum glutamic–pyruvic transaminase (SGPT) activities were less than those found for isopropanol plus CCl4. Hepatic triglyceride content also reflected reduced hepatotoxicity. Aminotriazole pretreatment did not produce any change in the rate of isopropanol elimination nor was the rise and subsequent decline in the blood concentrations of the derived acetone altered. An 18 h pretreatment with acetone enhanced CCl4 hepatotoxicity. Aminotriazole, 15 min prior to acetone, diminished the enhanced response of CCl4 to acetone (reduced SGPT activities and hepatic triglyceride content). Aminotriazole had no effect on acetone elimination from the blood 1, 4, and 8 h after the oral administration of acetone. Anil...
29 citations
TL;DR: Oxidation of O -benzyl- O -methyl derivatives of methyl α- d -glucopyranoside having only HO-6 unsubstituted, with chromium trioxide and dilute sulphuric acid in acetone, followed by esterification, gave high yields of the corresponding methyluronates, which were characterized as the amides.
28 citations
Patent•
10 Jul 1973
TL;DR: Methyl isobutyl ketone is produced in a one-step process by contacting acetone and hydrogen at a temperature of from about 50°-200°C and a pressure between 50-100 atm, preferably 60-100atm, in the presence of a cation exchange resin having from 0.001 to 0.1 weight percent of a noble metal distributed in monoatomic form therein this paper.
Abstract: Methyl isobutyl ketone is produced in a one-step process by contacting acetone and hydrogen at a temperature of from about 50°-200°C and a pressure between 50-100 atm, preferably 60-100 atm, in the presence of a catalyst composed of a cation exchange resin having from 0.001 to 0.1 weight percent of a noble metal distributed in monoatomic form therein.
27 citations
TL;DR: In this article, the isomerization of propylene oxide was carried out over silica-magnesia catalysts and metal oxides at 260-270°C using a pulse reactor.
Abstract: The isomerization of propylene oxide was carried out over silica-magnesia catalysts and metal oxides at 260–270°C using a pulse reactor. The main products of the reaction were propionaldehyde, acetone, allyl alcohol, 1-propanol, and acrolein. Propionaldehyde and acetone are produced on acidic and basic sites respectively. Allyl alcohol is formed over acid-base bifunctional catalysts. 1-Propanol and acrolein are mainly produced through hydrogen-transfer reactions between allyl alcohol and propionaldehyde and propylene oxide. As regards these reactions, acid-base bifunctional catalysts are favorable and the reaction rate depends on the electron-donating power of the hydrogen acceptor and the basic strength of the catalyst. The acid sites on silica-magnesia catalysts are attributed to the forsterite produced by the reaction of magnesium oxide and silica gel, and the basic sites, to the magnesium oxide remaining. The metal oxides, such as magnesium and calcium oxides, are considered to have very weak acid sites.
TL;DR: In this article, the effects of swelling of the sample and polymerization solvents were studied for photo-induced graft copolymerization of vinyl monomers on cellulose.
Abstract: The effects of swelling of the sample and polymerization solvents were studied for photo-induced graft copolymerization of vinyl monomers on cellulose. The graft copolymerization of methyl methacrylate (MMA) was activated by swelling of the sample or organic solvent-water solutions within a certain range of their concentrations. Though each organic solvent gave a maximum in per cent grafting and the number of grafts at about 25 vol-% concentration, the initiation reaction scarcely took place at 100% concentration; thus, the solvent itself is considered to have a negative effect. The solvents used in the experiments were all hydrophilic, such as methanol, acetone, and dioxane. The average molecular weight of the grafted PMMA differed in each solvent, indicating a different characteristic effect of solvent on the growing grafted polymer radicals. The presence of ferric ion as a sensitizer stimulated further the contributions of the sample swelling and the organic solvents to the copolymerization reaction. A similar effect was observed for styrene as for MMA, but not for acrylic acid and methacrylic acid.
TL;DR: In this article, the free carboxylic group was used to give rise to three anomalous products which correspond to oxidative decarboxylation (3,4 ) or lactonization (5 ).
TL;DR: The acetone powders prepared from leaf extracts of Tecoma stans L. were found to catalyze the oxidation of catechol to 3,4,3',4'-tetrahydroxydiphenyl, and the purified enzyme was remarkably specific forcatechol.
TL;DR: The reaction of testosterone-17β-acetate (3) with heptafluorobutyric anhydride in high purity and anhydrous acetone at room temperature leads to the preferential formation of 1 with less than 1% of the isomeric 2,4-diene as discussed by the authors.
TL;DR: In this article, the photolysis of 3,3-dimethylbutan-2-one (MTBK) has been studied in the gas phase at 408 and 326 K, mainly with light of 313 nm wavelength.
Abstract: The photolysis of 3,3-dimethylbutan-2-one (MTBK) has been studied in the gas phase at 408 and 326 K, mainly with light of 313 nm wavelength. At the higher temperature, the major products were methane, ethane, isobutane, isobutene, neopentane, tetramethylbutane, and carbon monoxide. At 326 K, in addition to these products, appreciable quantities of acetaldehyde, acetone, and biacetyl were detected. Quantum yields were determined using acetone and pentan-3-one as actinometers. A conventional mechanism is able to explain most of the experimental data. At 326 K, the results may be interpreted to yield a value for the rate constant for decomposition of the acetyl radical. Some theoretical calculations are reported on the acetyl radical decomposition and some earlier experimental work on this radical reevaluated.
TL;DR: In this paper, irradiation of a solution of 3,4,6-tri-O -acetyl-D -glucal in various mixtures of acetone and isopropyl alcohol was investigated to elucidate solvent effects on the photochemical addition of 2 to 1.
TL;DR: In this paper, the photochemical reaction of α-nitroepoxides showed marked solvent dependence, and the effects of acidity and hydrogen-donating property of solvents on the excited α-nodes were interpreted in terms of effects of the acidity.
Abstract: The photochemical reaction of α-nitroepoxides showed marked solvent dependence. The photolysis of (1,2-epoxy-2-nitropropyl)benzene (I) in 2-propanol led to the formation of three products 1-phenyl-1-isopropoxy-2-propanone (IIb), 1-phenyl-1,2-propanedione oxime (III) and 1-hydroxy-1-phenyl-2-propanone oxime (IV), whereas on irradiation in ether I gave exclusively IV. However, in t-butyl alcohol, benzene, acetone, acetonitrile or n-hexane, I was not susceptible to photolysis. The photolysis of α,α′-epoxy-α-nitrobibenzyl (V) in ether gave benzoin oxime (VII) in addition to benzaldehyde and benzoic acid, whereas in methanol it gave benzoin methyl ether (VI) in the dark. These reactions are interpreted in terms of effects of the acidity and hydrogen-donating property of solvents on the excited α-nitroepoxides. The pyrolysis of I and V were also examined.
Patent•
19 Dec 1973
TL;DR: In this article, a process for the production of 2,2-(4,4'-dihydroxydiphenyl)propane (bisphenol A) of high purity of condensation of phenol with acetone in the presence of strong acids is described.
Abstract: A process for the production of 2,2-(4,4'-dihydroxydiphenyl)propane (bisphenol A) of high purity of condensation of phenol with acetone in the presence of strong acids, which comprises Preparing an addition product of bisphenol A and phenol and Separating the constituents of this addition product by fractional condensation of the vapours obtained by treating the addition product at high temperature and at reduced pressure for a short time.
Patent•
09 Oct 1973TL;DR: In this article, the selectivity for organic hydroperoxides can be substantially increased by using a phosphate compound of Li, Na, Mg, Ca, Sr, Fe, Cu, U or B.
Abstract: In autoxidation of tertiary, aryl or cycloalkanes the selectivity for organic hydroperoxides can be substantially increased by using a phosphate compound of Li, Na, Mg, Ca, Sr, Fe, Cu, U or B. For example an autoxidation of isopentane with 0.05 wt. % boron phosphate at 9.9 mole % conversion gave selectivities of t-amyl hydroperoxides -- 75.0 mole %, acetone -- 18.3 mole % and t-amyl alcohol -- 1.5 mole %. The same reaction without the phosphate at 10.0 mole % conversion gave selectivities of t-amyl hydroperoxide -- 56.8 mole %, acetone -- 31.2 mole % and t-amyl alcohol -- 4.8 mole %.
TL;DR: Condensations of 3-hydroxybenzylhydrazine with acetone, cyclohexanone, and 1-methyl-4-piperidone in the presence of acid gave the 1,1-disubstituted 1,2,3,4-tetrahydrophthalazines as mentioned in this paper.
Abstract: Condensations of 3-hydroxybenzylhydrazine with acetone, ethyl methyl ketone, diethyl ketone, cyclohexanone, and 1-methyl-4-piperidone in the presence of acid gave the 1,1-disubstituted 1,2,3,4-tetrahydrophthalazines (2)–(6). On the other hand, the reactions of 3-hydroxybenzoylhydrazine (7) with acetone, cyclohexanone, and benzalde-hyde gave the Schiff's bases (8)–(10).
Patent•
19 Sep 1973
TL;DR: In this article, Bisphenol-A-bis(2-methacrylatoethyl) phthalate is prepared by the reaction of phthaloyl chloride with 2-hydroxyethyl methacrylate in pyridine and acetone.
Abstract: Esters are prepared by reaction of acyl halides and alcohols or hydroxyalkyl esters and acid halides in the presence of a tertiary amine and polar aprotonic solvents. Bis(2-methacrylatoethyl) phthalate is prepared by the reaction of phthaloyl chloride with 2-hydroxyethyl methacrylate in pyridine and acetone. Bis-phenol-A-bis(2-methacrylatoethyl)ether is prepared from 2,2-bis[4-(2-hydroxyethoxy)phenyl]-propane and methacryl chloride in acetone.
TL;DR: U(VI) can be separated from Ga, Fe(III), Bi, Pb, Cd, Zn, Cu(II) and Au(III) by quantitative elution with 0.50M HBr in 86% acetone from a column of AG50W-X4 cation-exchange resin of 200-400 mesh particle size.
TL;DR: The photodecomposition of 2-nitro-2-nitrosopropane (2-propylpseudonitrole) with light of λ > 540 nm was studied in this paper.
TL;DR: In this paper, direct irradiation of 2-methyl-2-(cyclopent-1-enyl)cyclopentanone (1) gives the hydroazulene (2), whereas the tricyclic ketone (4) is produced upon sensitized irradiation in acetone.
Abstract: Direct irradiation of 2-methyl-2-(cyclopent-1-enyl)cyclopentanone (1) gives the hydroazulene (2), whereas the tricyclic ketone (4) is produced upon sensitized irradiation in acetone.
Patent•
28 Sep 1973TL;DR: In this article, a mixture of bisphenols is used as the starting material for the production of low viscosity epoxy resins, where a phenolic compound is used to react with mixtures of acetone and formaldehyde.
Abstract: Mixtures containing a major proportion of 2,2-bis(4-hydroxyphenyl)propane and a minor proportion, e.g. 10-30 percent w, of the isomers of bis(hydroxyphenyl)methane are prepared by allowing a phenolic compound to react with mixtures of acetone and formaldehyde (preferably as trioxane). The recovered mixture of bisphenols serves as the starting material for the production of low viscosity epoxy resins.
TL;DR: In this paper, the hydrogen bonding ability of CF3CHCl2, CCl3CHCL2, CHClCl2Cl, and CHCl2CL2 with acetone and benzene as electron donors was measured in cyclohexane medium by NMR method.
Patent•
20 Feb 1973
TL;DR: In this paper, a 2,3,6-trimethylp-benzoquinone is prepared by catalytic hydrogenation using a palladium catalyst and an aliphatic ketone as solvent.
Abstract: 1365035 2,3,6-Trimethylhydroquinone KURARAY CO Ltd 20 Feb 1973 [3 March 1972] 8203/73 Heading C2C 2,3,6-Trimethylhydroquinone is prepared by the catalytic hydrogenation of 2,3,6-trimethylp-benzoquinone using a palladium catalyst and an aliphatic ketone as solvent. Suitable ketones are, for example, acetone, methyl isopropyl ketone and methyl isobutyl ketone. The palladium may be supported, e.g. on active carbon, barium sulphate or barium carbonate.