Suzuki cross-coupling in aqueous media catalyzed by a 1,1′-N-substituted ferrocenediyl Pd(II) complex
摘要:
Reaction of PdCl2(MeCN)(2) with Fe[eta-C5H4NC(H)Ph-N](2) (1) at MeOH at r.t. gives air-stable PdCl2Fe[eta-C5H4NC(H)Ph-N](2) (2; yield 84%). X-ray single-crystal diffraction analyses show that 2 is a Pd(II) square planar complex with N,N' chelation of the ferrocenediyl ligand, without Fe-Pd bond. It effectively catalyzes Suzuki cross-coupling reactions of aryl iodides and bromides with aryl boronic acids in aqueous media under non-homogeneous conditions in which the products can be easily isolated. The reaction conditions including choice of base, catalytic load and catalyst recoverability have been investigated and reported. (C) 2003 Elsevier B.V. All rights reserved.