期刊
ORGANOMETALLICS
卷 28, 期 6, 页码 1845-1854出版社
AMER CHEMICAL SOC
DOI: 10.1021/om8010596
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资金
- National Graduate Research School Combination NRSC-Catalysis
- joint activity of the graduate research schools NIOK
- HRSMC
- PTN
- Netherlands Organization for Scientific Research (CW-NWO)
Nickel(II) halide complexes of novel chelating bidentate benzimidazole-based N-heterocyclic carbenes have been prepared from Ni(OAc)(2) and bisbenzimidazolium salts. Single-crystal X-ray structure determination on four complexes revealed a cis-geometry on a square-planar nickel center. The complexes are active catalysts for the Kumada coupling of 4-chloroanisole and 4-bromoanisole with phenylmagnesium chloride. The most active catalyst gives a complete conversion of 4-bromoanisole within 75 min with a selectivity to 4-methoxybiphenyl of 82% and a complete conversion of 4-chloroanisole in less than 14 h with a selectivity to 4-methoxybiphenyl of 99%.
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