In the presence of a catalytic amount of Pd2+ or Pd0, oxidative homo-coupling of arylzinc compounds was achieved by the use of N-chlorosuccinimide (NCS) or O2 as an oxidant. Different reaction pathways were involved in the catalytic reactions depending on the oxidants; NCS or O2 probably oxidized I− or Pd0 to I+ or Pd2+, respectively. This reaction disclosed a new and facile synthetic method of biaryls from aryl halides or arenes via arylzinc intermediates.
在少量 Pd2+ 或 Pd0 催化剂存在下,使用 N-
氯代琥珀
酰亚胺(
NCS)或
氧气作为氧化剂,实现了芳基
锌化合物的氧化自偶联。根据氧化剂的不同,催化反应涉及不同的反应途径;
NCS 或
氧气可能分别将 I- 或 Pd0 氧化成 I+ 或 Pd2+。这个反应通过芳基
锌中间体,提供了一种从芳基卤化物或
芳烃合成联芳基化合物的新型简便方法。