Synlett

Homocoupling of arylboronic acids with a catalyst system consisting of a palladium (II) N-heterocyclic carbene complex and p-benzoquinone

Y Yamamoto

Index: Yamamoto, Yoshihiko Synlett, 2007 , # 12 p. 1913 - 1916

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Citation Number: 7

Abstract

This author and co-workers have developed Pd(OAc) 2 -catalyzed homocoupling that proceeds in methanol at room temperature under air. [13] A serious limitation of our protocol is low efficiency toward arylboronic acids bearing an electron-withdrawing substituent, resulting in the low yield of biaryls due to the formation of palladium black. Although the addition of triphenylphosphine as an external ligand or use of polyurea-encapsulated catalyst (Pd II EnCat TM ) are able ...

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