光诱导液相中BPEB的[2+2]环加成反应

Photoinduced the 2+2 Ring Addition Reaction of BPEB in Liquid Phase

环加成反应是在光或热的条件下,两个或多个不饱和分子通过双键相互加成生成环状化合物的反应。本研究以1,4-二[2-(4-吡啶)乙烯基]苯(BPEB)为前驱体,通过二甲基亚砜(DMSO)液相光诱导反应获得了BPEP二聚体。与在晶体固相中制备方法相比,该方法不需要模版剂或培养特定结构的晶体、能耗少、操作简单。同其他液相中2+2环加成反应相比,该方法不需要使用催化剂。该研究通过核磁以及红外光谱对环加成产物进行表征,此方法获得的目标产物特异性好及产率高等特点。

In this work,1,4-bis[2-(4-pyridyl)ethenyl]-benzene(BPEB)was synthesized viaheating reflux method,and dimerBPEB was synthesized in DMSO.Compared with previous synthesis method of BPEB dimer or polymer in solid crystal,the reaction occurs in a solution phase without any template agents.A hand-held ultraviolet lamp(365 nm)with the power of 12 Wand the watt density of 0.14 mW·cm-2 can realize the photodimerization of BPEB,instead of the high-power mercury lamp in most previous studies.Unlike other[2+2]cycloaddition in liquid state using catalysts or even noble metals,no catalysts are required here,which is cost-saving.The product was characterized via ~1 H NMR and IR.