Novel SN2 ring-opening reactions of 2- and 2,2-substituted thiiranes with thiols using Na+-exchanged X-type zeolite or triethylamine in methanol
作者:Hiroshi Takeuchi、Yasuhisa Nakajima
DOI:10.1039/a804879g
日期:——
the concentration and nucleophilicity of 2, the reactivity of 1 towards 2 and so on. This suggests that the reactions using Na+-zeolite X or Et3N proceed via a zwitterion or an ion-pairintermediate, respectively, by an SN2 attack on 1 of 2, having enhanced nucleophilicity due to the basic catalysts. The reactions using Na+-zeolite A-3 or H+-zeolite X in MeOH or benzene and that using H2SO4 in benzene