An Improved Method for the Regiospecific Synthesis of Polysubstituted [2.2]Paracyclophanes
作者:Hak-Fun Chow、Kam-Hung Low、King Y. Wong
DOI:10.1055/s-2005-872270
日期:——
4,16-Disubstituted, 4,7,12,15-tetrasubstituted, 4,8,12,16-tetrasubstituted and 4,5,7,8,12,13,15,16-octasubstituted [2.2]paracyclophanes can be prepared in significantly improved yields and excellent regiospecificities via the Winberg 1,6-elimination-dimerization reaction from substituted (4-methylbenzyl)trimethylammonium hydroxides. Using 2-chloro-phenothiazine instead of phenothiazine as a polymerization inhibitor results in a doubling of product yields.
4,16-二取代、4,7,12,15-四取代、4,8,12,16-四取代及4,5,7,8,12,13,15,16-八取代[2.2]对环聚醌可通过Winberg 1,6-消除-聚合反应,从取代的(4-甲基苄基)三甲胺氢氧化物中显著提高产率和优良的区域特异性。使用2-氯苯噻嗪代替苯噻嗪作为聚合抑制剂可使产品产率翻倍。