Photothermal Side-Chain Bromination of Methyl-, Dimethyl-, and Trimethylbenzenes with<i>N</i>-Bromosuccinimide
作者:Shuntaro Mataka、Guo-Bin Liu、Tsuyoshi Sawada、Masayoshi Kurisu、Masashi Tashiro
DOI:10.1246/bcsj.67.1113
日期:1994.4
Tri- and dibromination of methyl-, dimethyl-, and trimethylbenzenes with N-bromosuccinimide were accomplished by photothermal reaction with a tungsten lamp in carbon tetrachloride or benzene. (Dibromomethyl)arenes and (tribromomethyl) derivatives were produced depending upon a solvent used and a substituent on the benzene ring. In the bromination of methylbenzenes without a substituent on the ortho-position, (tribromomethyl)benzenes were formed. On the other hand, ortho-substituted methylbenzenes gave (dibromomethyl)benzenes. α,β-Dibromo-1,2-diarylstilbenes were formed via the debrominative carbon–carbon coupling reaction of (tribromomethyl) benzenes upon irradiation with a tungsten lamp.
采用钨丝灯在四氯化碳或苯溶剂中进行光热反应,实现了N-溴代琥珀酰亚胺对甲基苯、二甲基苯和三甲基苯的二溴化和三溴化。根据所用溶剂和苯环上取代基的不同,生成了二溴甲基芳烃和三溴甲基衍生物。在邻位无取代基的甲基苯的溴化反应中,生成了三溴甲基苯。另一方面,邻位取代的甲基苯生成了二溴甲基苯。通过三溴甲基苯在钨丝灯照射下的脱溴碳-碳偶联反应,生成了α,β-二溴-1,2-二芳基苯乙烯。