lead to production of the desired 1,3-dienic δ-sultones in fairly high yields and short reaction times. Beside its role as a solvent, the NMP-ClSO3H salt efficiently catalyzes the self-condensation of acetophenones and plays as a mild sulfonating agent in conversion of the resulting condensates into δ-sultones. The reaction protocol is simple and follows a green work-up procedure that enables to recover
向N-甲基-
2-吡咯烷酮(
NMP)中添加
氯磺酸导致形成低熔点固体,其具有在环境温度下至少4个月内合理稳定且易于处理的优点。该固体与
苯乙酮衍
生物形成均相溶液,该
苯乙酮衍
生物在不存在任何其他溶剂和催化剂的情况下加热,以相当高的收率和较短的反应时间产生所需的1,3-二烯基δ-磺内酯。除了作为溶剂,
NMP-ClSO 3H盐可有效催化
苯乙酮的自缩合,并在将生成的缩合物转化为δ-磺内酯中充当温和的磺化剂。该反应方案简单,遵循绿色后处理程序,可回收反应残留物并防止废物排放到环境中。