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 copolymer (4VK) of 4-vinylpyridine (4VP) and methyl vinyl ketone (MVK) was nearly quantitatively converted into an oxime, which could be complexed with various metal salts.
Abstract: The copolymer (4VK) of 4-vinylpyridine (4VP) and methyl vinyl ketone (MVK) was nearly quantitatively converted into an oxime (4VKX) which could be complexed with various metal salts. 4VKX was compared with 4VK in their membrane performance. When crosslinked with divinyl sulfone (DVS), the 4VKX membrane showed a higher strength than cellulose acetate (CA) membrane and a higher performance than 4VK membrane crosslinked with dihydrazine derivatives. The most adequate DVS content and copolymer composition were found to be 25 mol % based on MVK oxime and 1:1, respectively. A metal salt taken up by the membrane in a much larger amount tended to be highly rejected. The crosslinking quaternization of 4VKX with diisobutane (DIB) very effectively improved water permeability, as did 4VK, and gave a membrane performance superior to that of 4VK. The most appropriate charge ratio of DIB was 15–20 mol % based on 4VP. Some transport characteristics and compaction in a long-term operation were investigated and discussed.
4 citations
TL;DR: In this paper, X-ray crystallographic, computer modelling and NMR techniques have been used to elucidate questions concerning configurational preferences, reaction pathways and the apparent difference in susceptibility towards aza-Michael reactions exhibited by methyl acrylate and methyl vinyl ketone (MVK) derived Baylis-Hillman substrates.
4 citations
TL;DR: In this article , a high-throughput screening exercise testing 60 different catalysts resulted in 5 wt % Pt on sulfided carbon as the best catalyst in the conversion of bio-based methyl levulinate (ML) to methyl vinyl ketone (MVK) in a gas-phase continuous process.
Abstract: A high-throughput screening exercise testing 60 different catalysts resulted in 5 wt % Pt on sulfided carbon as the best catalyst in the conversion of bio-based methyl levulinate (ML) to methyl vinyl ketone (MVK) in a gas-phase continuous process. Up to 18% yield of MVK was obtained, but fast catalyst deactivation was observed. For a better understanding of the reaction mechanism, the potential reaction intermediates [α-angelica lactone (α-AL), γ-valerolactone, methyl ethyl ketone (MEK), and levulinic acid (LA)] were also fed as starting materials under the same reaction conditions as those used for ML. Of the different pathways possible, the route via AL seems to be the most likely route. Since the side product methanol led to the hydrogenation of MVK to MEK, LA is a better substrate in this reaction toward MVK at a medium reaction temperature. Herein, we report the highest yield of MVK (>50%) from LA at 350 °C. However, this knowledge of the reaction pathway via AL also opened up the possibility of a high-temperature conversion process of ML to MVK. It was found that ML could be converted to MVK in 71% selectivity at 600 °C using 40% CaO on γ-Al2O3 as the catalyst. Here, the catalyst merely serves to accelerate the ring closure of ML to AL, which undergoes an electrocyclic reaction under extrusion of CO to form MVK.
4 citations
TL;DR: In this paper, a weak lewis base such as imidazole can promote the reaction to give the normal Baylis-Hillman adduct under good yields under heterogeneous reaction conditions.
Abstract: In the Baylis-Hillman reaction of aldehydes with methyl vinyl ketone, we found that, in the presence of a stoichiometric amount of binol and silica gel(SiO2), a weak lewis base such as imidazole can promote the reaction to give the normal Baylis-Hillman adduct under good yields under heterogeneous reaction conditions.
4 citations
Patent•
17 Jan 1962
TL;DR: In this paper, the proportion of such antiozonant may be 0,1-5% of the rubber. But this is not the case for all rubber compounds. But it is the case of natural rubber and copolymers of an aliphatic conjugated diolefine, e.g. butadiene.
Abstract: Vulcanized rubber contains as antiozonant a thiourea having one or more alkyl, alkenyl, aralkyl or alicyclic substituents in the molecule. The proportion of such antiozonant may be 0,1-5% of the rubber. Rubbers referred to are natural rubber and copolymers of an aliphatic conjugated diolefine, e.g. butadiene, with styrene, acrylonitrile, methyl vinyl ketone and methyl isopropenyl ketone. Examples are of testing vulcanizates of such rubbers containing di-n-butyl, di-n-hexyl, dibenzyl, diethyl, di-n-octyl, di-n-dodecyl, di-n-hexadecyl, di-n-octadecyl, di-n-octadecenyl, N-methyl-N1-dodecyl, tributyl and N,N-petnamethylene-N1-benzyl, and tetrabutyl thioureas and diethyl and dibenzyl thioureas in a polyethylene amine carrier of composition R.N[(C2H4O)nH]2, R being the oleyl group. Specification 887,173 is referred to.
4 citations