二茂铁亚胺环钯化合物——一种新型芳基氯化汞偶联催化剂

Cyclopalladated Ferrocenylimines——A Novel Type of Catalyst for Dimerization of Arylmercuric Chlorides

发现在催化量二茂铁亚胺环钯化合物催化下,芳基氯化汞可在温和条件下偶联,以中等或高的收率生成联芳烃.对于铑盐不能催化偶联的邻位取代苯基氯化汞和α-萘基氯化汞,在此体系中亦可发生偶联.以HMPA为溶剂,在x=0.025(摩尔分数)化合物1或2催化下与2.0当量氯化锂存在时,得到最好的催化效果.

Dimerization of arylmercuric chlorides has been found to proceed using a catalytic amount of cyclopalladated ferrocenylimines under mild conditions, affording a variety of biaryls in moderate to excellent yields. Even orthosubstituted phenylmercuric chlorides and alpha-naphthylmercuric chloride, which can not be catalytically dimerized by rhodium salt are applicable to this reaction. The best results were obtained with 0.025 (molar fraction) 1 in the presence of 2.0 equiv. of LiCl in HMPA at 80 degreesC