Competition entre substitution nucleophile et reduction chez les bromo-9 anthracenes dans l'action des anions phenate et methylate
作者:J. Rigaudy、A.M. Seuleiman、Nguyen Kim Cuong
DOI:10.1016/0040-4020(82)80052-5
日期:1982.1
potassium phenoxide in DMF gives rise to a competition between nucleophilic substitution and reductive dehalogenation. Derivatives carrying electron attracting groups, 1c (Br), 1e (CN) and 1f (NO2), react essentially by substitution leading to phenolic ethers 2, whereas with non-activated bromides, 1a (H), 1b (C6H5) and 1d (OC6H5), the main reaction is a reduction to anthracenes 3 which should arise from
用DMF中的苯酚钾处理α位不带氢的内取代的9-溴蒽在亲核取代和还原脱卤之间引起竞争。带有电子吸引基团1c(Br),1e(CN)和1f(NO 2)的衍生物基本上通过取代反应生成酚醚2,而与未活化的溴化物1a(H),1b(C 6 H 5))和1d(OC 6 H 5),主要反应是还原为蒽3 这应该是由电子转移引起的。