General acid catalysis in the hydrolysis of 1,3-dioxolanes and 1,3-oxathiolanes. The hydrolysis of acetals and thioacetals of p-(dimethylamino)benzaldehyde
作者:Thomas H. Fife、R. Natarajan
DOI:10.1021/ja00269a048
日期:1986.4
intermediate occurs in hydrolysis of the dioxolane, and the rate-determining step changes to ring opening near pH 8. Rapid attack of a ,&substituent group on an oxocarbonium ion intermediate was demonstrated in ring closure of the oxocarbonium ion produced by C-S cleavage of p(dimethy1amino)benzaldehyde 0-(8-mercaptoethyl) S-(P-hydroxyethyl) thioacetal; the values of kow for hydrolysis of that compound are