Zeolite-promoted benzylation of alcohols with benzyl chloride has been investigated. By use of a series of cation-exchanged zeolites, which have the same crystalline structure but different acid and base properties, it is confirmed that the cooperative function of acid sites and base sites of zeolite is required for the effective benzylation of alcohols although both acid and base strengths are low. It is also found that alcohols show different reactivities in zeolite from those in solution depending on their molecular structures because the benzylation is promoted inside the narrow cavities of zeolite.
沸石促进的苯
甲基氯与醇的苄基化反应已被研究。通过使用一系列阳离子交换的
沸石,这些
沸石具有相同的晶体结构但不同的酸碱性质,证实了尽管酸和碱的强度较低,但
沸石的酸位点和碱位点的协同作用对于醇的有效苄基化反应是必要的。还发现,由于苄基化反应在
沸石的狭窄孔道内得到促进,醇在
沸石中的反应活性与在溶液中不同,这取决于它们的分子结构。