Photobromination of Side-Chain Methyl Groups on Arenes with<i>N</i>-Bromosuccinimide–Convenient and Selective Syntheses of Bis(bromomethyl)- and (Bromomethyl)methylarenes–
作者:Shigeru Futamura、Zhi-Min Zong
DOI:10.1246/bcsj.65.345
日期:1992.2
Photobromination of side-chain methyl groups on arenes with N-bromosuccinimide (NBS) was investigated. Visible light irradiation in benzene solvent was extremely effective in increasing the selectivity of the reaction and the efficiency for product purification. The photobromination of 1,4-, 1,8-, 2,3-, and 2,6-dimethylnaphthalenes, 4,4′-dimethylbiphenyl, and p-xylene with 2.2 mol equivalents of NBS
研究了用 N-溴代琥珀酰亚胺 (NBS) 对芳烃上的侧链甲基进行光溴化。苯溶剂中的可见光照射对于提高反应的选择性和产物纯化的效率非常有效。1,4-、1,8-、2,3- 和 2,6-二甲基萘、4,4'-二甲基联苯和对二甲苯与 2.2 mol 当量的 NBS 进行光溴化反应,定量得到相应的双(溴甲基)芳烃,分别。在上述二甲基芳烃与 1.1 摩尔当量 NBS 的光溴化反应中,也以良好的收率获得了(溴甲基)甲基芳烃。