Polycarboxylic acids and esters P 0253Dimerization of Sodium Enolates of Malonic Ester and Acetylacetone Effected by the Action of 4-Methyl-3,4-dibromotetrahydropyran. -Reaction of the title compounds (I) and (II) affords the dimerization products (III) instead of the substituted pyrans (IV). In this case, dibromide (II) seems to act as oxidant which is converted to 4-methyl-2H-dihydropyran. -(GEVORKYAN, A. A.; ARAKELYAN, A. S.; BARSEGYAN, S. V.; PETROSYAN, K. A.; PANOSYAN, G. A.; Russ.
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