5 6 gives 4-phenyltriazol-2-ylacetic acid (6) on hydrolysis. This differs from the reaction of 4- phenyltriazole anion with ethyl chloroacetate, in which esters leading to 6 and 7 are produced (eq 9). B Both of the isomeric acids (7, 8) were prepared by the alternate route of eq 10. Since the structures of 7 and 8 are predetermined by their mode of synthesis as either 1 or 3 substituted, the remaining isomer (6) must be 2 substituted.
