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 article, the reaction of isothiocyanates with in situ generated carbanions of α,β-unsaturated ketones yielded α,α-β-unaturated keto thioamides which in the reaction with acids or bases cyclized to give 2,6-disubstituted thiopyran-4-ones and in reaction with α-bromoesters gave thiazolidin-4 -one derivatives.
4 citations
TL;DR: This reaction provides a novel approach to these oxazolones with potential therapeutic importance and other ring A analogs were synthesized also.
4 citations
TL;DR: In this paper, the effect of pressure on the binary copolymerization of St-MAMMA is discussed, and it appears that in case of conjugated monomers reactivity decreases as the electron-donating character of the substituents increases.
Abstract: Synopsis This article describes the copolymerization of methyl vinyl ketone (MVK), methyl acrylate (MA), and methyl methacrylate (MMA) with styrene (St) as reference monomer at 3.4 MPa and 335 K with toluene as solvent. In addition, the effect of pressure on the binary copolymerizations of St-MAMMA is discussed. It appears that in case of conjugated monomers reactivity decreases as the electron-donating character of the substituents increases, whereas the reverse is found in unconjugated monomers. This is explained by the finding that in conjugated monomers resonance effects induced by polar factors play a dominant role, whereas in unconjugated monomers mainly polar factors are governing the relative reactivities. The r values at 3.4 MPa are compared with those predicted by means of the Q-e scheme and Patterns. No definite conclusions could be drawn about the applicability and validity of either scheme, although Patterns shows excellent result in case of the H function of Mayo. In vinyl ester copolymerizations and Le Noble and Asano’s example of the Menshutkin reaction one single factor (polarity and steric hindrance, successively) dominates AG#, AG, and AV#. This allows a straightforward interpretation of the results with the Hammond postulate and is in full agreement with Evan’s potential-energy calculations. In conjugated monomers, however, an interplay of resonance and polar factors is found. The general validity of these findings needs further experimental and theoretical support.
4 citations
TL;DR: In this article, a 30-40% selectivity was achieved by the reaction of methanol and acetone at 350 °C over Ti(IV)-, Cr(III)-, Mn(II)-, and Sn(IV) exchanged forms of fluoro tetrasilicic mica (TSM).
Abstract: Methyl vinyl ketone was obtained at 30–40% selectivity by the reaction of methanol and acetone at 350 °C over Ti(IV)-, Cr(III)-, Mn(II)-, and Sn(IV)-exchanged forms of fluoro tetrasilicic mica (TSM). The addition of oxygen into the feed increased the conversion of acetone and the reaction over Ti(IV)-TSM converted 11% of acetone fed into methyl vinyl ketone at 85% selectivity.
4 citations
TL;DR: In this article, the structures and energy properties of Diels-Alder reactions between cyclopentadiene and ethylene, isoprene and methyl vinyl ketone were investigated.
Abstract: Ab initio molecular orbital calculations have been used to investigate the structures and energetics for the reactants and transition states of Diels-Alder reactions between cyclopentadiene and ethylene, isoprene, cyclopentadiene, acrylonitrile, and methyl vinyl ketone (MVK). Geometry optimizations were performed with both RHF/3-21G and RHF/6-31G * calculations, and the energies were computed to the MP3/6-1G * //6-31G * level in each case. Calculations the vibrational frequencies permitted computation of the enthalpies and entropies of activation
4 citations