Confined Space-Controlled Hydroperoxidation of Trisubstituted Alkenes Adsorbed on Pentasil Zeolites
作者:Yu-Zhe Chen、Li-Zhu Wu、Li-Ping Zhang、Chen-Ho Tung
DOI:10.1021/jo050081n
日期:2005.6.1
the zeolites and reacted with alkenes. For all the substrates studied, the ene-type allylic hydroperoxides were obtained in a highly regioselective manner. The regiochemistry for 1−4 in favor of the allylic hydrogen abstraction from the largest substituents is in contrast to their photooxidation within the dye-supported zeolite Na−Y, where the secondary hydroperoxides are preferentially produced. The
三烷基烯烃2-甲基-2-戊烯(1),1-甲基环己烯(2),反式-3-甲基-2-戊烯(3),顺式-3-甲基-2-戊烯(4)和2的光敏氧化-甲基-2-丁烯(5研究了Na-ZSM-5沸石内部骨架中包含的)。将吸附了烯烃的沸石样品悬浮在异辛烷中,并将敏化剂四苯基卟啉(TPP)溶解在该溶液中。溶液中产生的单重态氧扩散到沸石的内部骨架中,并与烯烃反应。对于所有研究的底物,均以高度区域选择性的方式获得了烯型烯丙基氢过氧化物。的区域化学为1 - 4有利于从最大取代基中提取烯丙基氢的方法与它们在染料负载的沸石Na-Y中的光氧化相反,后者优先生成仲氢过氧化物。ZSM-5分子筛狭窄通道内烯烃的紧密封闭可能是造成这种选择性的原因。