SYNTHESIS OF p-CHLOROAZACALIX[5]ARENE PENTAMETHYL ETHER: RING SIZE-DEPENDENT DEPROTECTION OF N-BENZYL GROUPS
摘要:
Syntheses of chlorinated azacalix[4]arene and azacalix[5]arene have been investigated. While the preparation of the former failed in the final N-debenzylation step, the latter was successfully obtained. The observed ring size-dependent deprotection was interpreted by steric effect.