Some acetonyltriphenylphosphonium, methoxycarbonylmethyltriphenylphosphonium salts and their triphenylarsonium analogues could undergo Wittig reaction with aldehyde in good yields. Their reactivity was counteranion-dependent and was arranged in the following order: p-TsO−, Br−≪CF3CO2−≪ClCH2CO2−
Keywords :
counteranion , Wittig reaction , ozonide , triphenylphosphonium ylide , triphenylarsonium ylide , triphenylarsonium salts , triphenylphosphonium salts