Studies on Vinyl acetals. II:Oxidation of Vinyl acetals

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An oxidation of vinyl acetal (namely, 1, 1-dialkoxy-3-butene) has been investigated under the condition of accompanying no hydrolysis of acetal group.(1). In case of oxidation by ozone, it gave corresponding yield of ozonide and a catalytic reductive cleavage of this gave formaldehyde and malondialdehyde monoacetal. The latter was converted easily into 1, 1, 3, 3-tetraalkoxypropane by acetalization or its condensation with guanidine gave 2-aminopyrimidine.(2). Epoxylation can be carried out by the oxidation with perbenzoic acid or by dehydrochlorination of HOCl additive of vinyl acetal with alkali to obtain corresponding 3, 4-epoxybutyraldehyde acetal.(3). Alkaline KMnO<SUB>4</SUB> oxidation gave α-glycol (namely, 3, 4-dihydroxybutyraldehyde acetal).
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