Abstract Second-order rate constants have been measured spectrophotometrically for alkaline hydrolysis of Y-substituted phenyl phenyl carbonates (2a-j) and compared with the values reported previously for the corresponding reactions of Y-substituted phenyl benzoates (1a-j). Carbonates 2a-j are 8~ 16 times more reactive than benzoates 1a-j. The Hammett plots correlated with and constants exhibit many scattered points, while the ...