Aryl esters, 1, carbonates, 2, and carbamates, 3, are three classes of compounds which differ only in the acyl part, R, RO and RNH where R is alkyl or aryl. The aminolysis mechanism of the carbonates is quite similar to that of esters, 1, and carbonates, 2, especially to the latter. For example, the aminolysis of aryl O-ethylcarbonates1 (2a; R= Et) and aryl N-phenylcarbamates2 (3a; R= C6H4Y) were found to proceed via two reaction ...