New, sterically demanding 1,3-dialkylbenzimidazolium salts (2a–c) as N-heterocyclic-carbene precursors have been synthesized and characterized. The ortho position of aromatic aldehydes was directly and selectively arylated with aryl chlorides in the presence of a catalytic system prepared in situ from Pd(OAc)2, 1,3-dialkylbenzimidazolium chlorides (2a–c), and Cs2CO3. © 2008 Wiley Periodicals, Inc.
已经合成并表征了新的、空间要求高的 1,3-二烷基
苯并咪唑鎓盐 (2a-c) 作为 N-杂环卡宾前体。在由 Pd(OAc)2、1,3-二烷基
苯并咪唑鎓
氯化物 (2a-c) 和 Cs2CO3 原位制备的催化体系存在下,芳族醛的邻位被芳基
氯化物直接和选择性地芳基化。© 2008 Wiley Periodicals, Inc. 杂原子
化学 19:569–574, 2008; 在线发表于 Wiley InterScience (www.interscience.wiley.com)。DOI 10.1002/hc.20479