Oxiran formation in the base-catalysed reaction of long-chain alkyldimethylsulphonium salts and carbonyl compounds in benzene–water

1973 ◽  
pp. 527-528 ◽  
Author(s):  
Yumihiko Yano ◽  
Tsuneo Okonogi ◽  
Masami Sunaga ◽  
Waichiro Tagaki
Keyword(s):  
Carbonyl Compounds ◽  
Catalysed Reaction ◽  
Long Chain

scholarly journals Characterization of a long-chain 14C-labelled alcohol resulting from a plant enzyme-catalysed reaction with S-adenosyl[methyl-14C]methionine

1972 ◽  
Vol 128 (3) ◽  
pp. 605-610 ◽  
Author(s):  
S. A. Ludwig ◽  
C. L. Villemez
Keyword(s):  
Enzyme Preparation ◽  
Primary Alcohol ◽  
Hydrocarbon Chain ◽  
Molecular Formula ◽  
Methyl Group ◽  
Catalysed Reaction ◽  
The One ◽  
Plant Enzyme ◽  
Long Chain

A particulate enzyme from Phaseolus aureus seedlings catalyses the incorporation of radioactivity from S-adenosyl[Me-14C]methionine into several lipid acceptors present in the enzyme preparation. The structure of one of the radioactive lipids has been elucidated by using mass, n.m.r. and i.r. spectral data. This compound has a molecular formula C28H57OH, is a saturated primary alcohol and has a single branch of one methyl group in the interior of the hydrocarbon chain. The results of a Kuhn–Roth degradation demonstrate that the branch methyl group is the one derived from S-adenosylmethionine.

The extension to long-chain alkanes and to high temperatures of the hydroperoxide chain mechanism of autoxidation

1969 ◽  
Vol 308 (1495) ◽  
pp. 547-568 ◽  
Keyword(s):  
Carbonyl Compounds ◽  
Oxidation Products ◽  
Antioxidant Compounds ◽  
Chain Mechanism ◽  
Chemical Methods ◽  
Alkyl Radicals ◽  
Phase Oxidation ◽  
Two Factors ◽  
Alkylperoxy Radicals ◽  
Long Chain

The liquid-phase oxidation of 2-methylhexadecane has been studied to determine how adequately the hydroperoxide chain mechanism describes the oxidation of high molecular weight alkanes and to elucidate the changes in this mechanism caused by increased temperature. The reaction between 2-methylhexadecane and molecular oxygen has been studied at temperatures of 145 to 230 °C and the oxidation products analysed by gas-chromatographic and chemical methods. Over 160 products including hydroperoxides, alkanes, alcohols, carbonyl compounds and acids have been identified and the dependence of their yields on time, temperature and oxygen concentration measured. The attack on 2-methylhexadecane at temperatures throughout this range is selective, indicating that chain propagation occurs predominantly by the reaction of alkylperoxy radicals with alkane molecules followed by the addition of oxygen to the alkyl radicals so formed. At low temperatures the former reaction is rate-determining. However, an increase in temperature increases the rate of this reaction and reduces the concentration of oxygen dissolved in the alkane; the combined effect of these two factors causes the addition of oxygen to alkyl radicals to become rate-determining at temperatures above ca . 210 °C. As a result of this change, the concentration of alkyl radicals relative to that of alkylperoxy radicals increases with temperature. Consequently, both the yield of alkanes, and the fraction of secondary alkyl radicals that react with 2-methylhexadecane molecules to form more stable tertiary radicals, increase. These results help to predict the necessary properties of a high temperature antioxidant; compounds that react specifically with alkyl radicals rather than with alkylperoxy radicals should function thus.

The mechanism of 1,3-dioxolane formation from the BF3 -catalysed reaction of epoxides with carbonyl compounds

Tetrahedron ◽  
1970 ◽  
Vol 26 (6) ◽  
pp. 1311-1313 ◽  
Author(s):  
B.N. Blackett ◽  
J.M. Coxon ◽  
M.P. Hartshorn ◽  
A.J. Lewis ◽  
G.R. Little ◽  
...  
Keyword(s):  
Carbonyl Compounds ◽  
Catalysed Reaction

The BF3-Catalysed Reaction between 2-Methylfuran and Some a,b-Unsaturated Carbonyl Compounds.

Heterocycles ◽  
1981 ◽  
Vol 15 (2) ◽  
pp. 1079 ◽  
Author(s):  
John W. ApSimon ◽  
V. Seenu Srinivasan ◽  
M. R. L’Abbé ◽  
R. Seguin
Keyword(s):  
Carbonyl Compounds ◽  
Catalysed Reaction

scholarly journals Enzymes catalysing conjugations of glutathione with αβ-unsaturated carbonyl compounds

1968 ◽  
Vol 109 (4) ◽  
pp. 651-661 ◽  
Author(s):  
E. Boyland ◽  
L. F. Chasseaud
Keyword(s):  
Ammonium Sulphate ◽  
Carbonyl Compounds ◽  
Lower Energy ◽  
Rat Kidney ◽  
Heat Inactivation ◽  
Phenoxyacetic Acid ◽  
Diethyl Maleate ◽  
Catalysed Reaction ◽  
Ammonium Sulphate Fractionation ◽  
Inhibition Studies

1. Heat-inactivation experiments, ammonium sulphate-fractionation studies, enzyme-inhibition studies with S-(αβ-diethoxycarbonylethyl)glutathione, and evidence from the distribution of activities in rat liver, in rat kidney and in the livers of other animals, indicate that reactions of glutathione with (i) trans-benzylideneacetone, (ii) cyclohex-2-en-1-one, (iii) trans-cinnamaldehyde, (iv) diethyl maleate, (v) diethyl fumarate and (vi) 2,3-dimethyl-4-(2-methylenebutyryl)phenoxyacetic acid are catalysed by different enzymes. 2. Evidence is presented that the enzymes catalysing the reactions of glutathione with substrates (i)–(iv) are different from glutathione S-alkyltransferase, S-aryltransferase and S-epoxidetransferase. 3. The name ‘glutathione S-alkenetransferases’ is proposed for enzymes catalysing reactions of glutathione with αβ-unsaturated compounds. 4. The Arrenhius plot for the enzyme-catalysed reaction of diethyl maleate with glutathione is discontinuous, with lower energy of activation at 38°.

scholarly journals β-Borylation of conjugated carbonyl compounds with silylborane or bis(pinacolato)diboron catalyzed by Au nanoparticles

2020 ◽  
Vol 18 (43) ◽  
pp. 8921-8927
Author(s):  
Marios Kidonakis ◽  
Michael Fragkiadakis ◽  
Manolis Stratakis
Keyword(s):  
Carbonyl Compounds ◽  
Au Nanoparticles ◽  
Analogous Reaction ◽  
Catalysed Reaction

β-Borylation occurs in the Au/TiO2-catalysed reaction between the silylborane Me2PhSiBpin and conjugated carbonyl compounds, in contrast to the so far known analogous reaction catalysed by other metals, where β-silylation occurs instead.

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