Results All the reactions were carried out at 30" C in aqueous solution of constant ionic strength of 0.2 M. The rates were determined spectrophotometrically by following the disappearance of the thiolester absorption. Pseudo-firsborder plots were usually linear over four half-lives. The final spectra of reaction mixtures coincide well with those of expected hydrolysis products (acid+ thiol) except for mea where a nucleophile-like hydrazine was At ...
