Reactions of α-monochloro- and α,α-dichloro-β-oxoaldehyde acetals with bases
摘要:
alpha,alpha-Dichloro-beta-oxoaldehyde diethyl acetals decompose under the action of bases (NaOH, MeONa) with cleavage of the carbon-carbon bond and formation of carboxylic acids or their esters and the dichloroacetaldehyde diethyl acetal carbanion. The latter reacts in situ with benzaldehyde to form stable alpha-chloro-alpha,beta-epoxyacetal. alpha-Chloro-alpha-formly-gamma-butyrolactone diethyl acetal is transformed into alpha-chloro-alpha-diethoxymethyl-gamma-hydroxybutyric acid under the action of an alkali.