Topic
Methyl vinyl ketone
About: Methyl vinyl ketone is a research topic. Over the lifetime, 1510 publications have been published within this topic receiving 26839 citations. The topic is also known as: 3-buten-2-one & gamma-oxo-alpha-butylene.
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TL;DR: In this paper, the structure of NN-dimethylisobutenylamine with methyl vinyl ketone was deduced from extensive spectroscopic examination of the adduct.
Abstract: The reaction of NN-dimethylisobutenylamine with methyl vinyl ketone gives 2-dimethylamino-3,3,6-trimethyl-3,4-dihydro-2H-pyran as the first formed product. The structure was deduced from extensive spectroscopic examination of the adduct. The chemical reactions of the adduct, however, indicated a ready equilibration of the dihydropyran with methyl 2-dimethylamino-3,3-dimethylcyclobutyl ketone through the immonium enolate intermediate. Other enamines and vinyl ketones appear to behave similarly.
11 citations
TL;DR: In this paper, the main-chain scission of atactic poly(t-BVK) and isotactic polymers of tert-butyl vinyl ketone and its copolymers with styrene and α-methylstyrene was studied in dioxane as a solvent at room temperature.
Abstract: Photodegradation behavior of atactic and isotactic polymers of tert-butyl vinyl ketone (t-BVK) and its copolymers with styrene and α-methylstyrene was studied in dioxane as a solvent at room temperature. The quantum yield of main-chain scission of atactic poly(t-BVK) was found to be larger than that of isotactic poly(t-BVK) and atactic poly(methyl vinyl ketone). From the Stern-Volmer plots on the quenching study of atactic poly(t-BVK) with naphthalene and 2,5-dimethyl-2,4-hexadiene, it was found that 60–70% of its photochemical reaction underwent main-chain scission from the triplet state. It was also found that the increase in t-BVK contents of both copolymers accelerated the photodegradation, and the copolymer with styrene was more photodegradable than that with α-methylstyrene. These results seemed to suggest that the main-chain scission of these vinyl ketone polymers and copolymers proceeded through a Norrish type II photoelimination mechanism.
11 citations
TL;DR: In this article, a simple direct exchange reaction has been discovered for vinyl groups in which the exchangeable deuterium of alcohols or water (D2O) replaces only the alpha-hydrogen of activated vinyls under catalysis by DABCO (1,4-diazabicylo-(2.2.) octane).
Abstract: : A simple, direct exchange reaction has been discovered for vinyl groups in which the exchangeable deuterium of alcohols (e.g. CH3OD) or water (D2O) replaces only the alpha-hydrogen of activated vinyls under catalysis by DABCO (1,4-diazabicylo-(2.2.2.) octane). Acrylate esters, acrylonitrile, acrylamides and methyl vinyl ketone were found to go rapid exchange at room temperature to give easily isolated, pure and readily polymerizable alpha-deuterated compounds. This procedure is the most general efficient and cost-effective one available for obtaining such isotopically labeled materials.
11 citations
TL;DR: In this article, the HSAB theory was used to explain the 1,2-addition properties of organic compounds such as acrolein, methyl vinyl ketone, benzalacetone, chalcone, and 2-cyclohexen-1-one.
Abstract: Organoytterbium iodide σ complexes (RYbl) react with α,β-unsaturated carbonyl compounds such as acrolein, methyl vinyl ketone, benzalacetone, chalcone, and 2-cyclohexen-1-one to give 1,2-addition products selectively. This high selectivity is explained in terms of the HSAB theory.
11 citations
TL;DR: The absorption spectrum and cross sections of vinyl radicals were determined in the gas phase in the spectral range 220−550 nm as mentioned in this paper, where the spectrum exhibits a relatively broad and intense absorption centered at about 232 nm, followed by at least two identifiable and weaker absorptions with maxima at about 340 and 420 nm.
Abstract: The absorption spectrum and cross sections of vinylperoxy (C2H3O2, ethenylperoxy) radical have been determined, for the first time in the gas phase, in the spectral range 220−550 nm. The spectrum exhibits a relatively broad and intense absorption centered at about 232 nm, followed by at least two identifiable and weaker absorptions with maxima at about 340 and 420 nm. The absorption tail persists at longer wavelengths into the visible region. To discern competition between the stabilization of the vinylperoxy isomers and reaction, the effect of pressure on the absorption has been examined. Vinylperoxy radicals in these experiments were produced through photochemical production of vinyl radicals followed by reaction of vinyl radicals with molecular oxygen. Vinyl bromide (C2H3Br) photolyzed at 193 nm was used as the precursor of vinyl radicals, and methyl vinyl ketone (CH3COC2H3) photolyzed at 193 nm was used as a precursor of both methyl and vinyl radicals. In the latter system identical concentrations of ...
11 citations