☆ 4.5 Article

Coordination of N-methylpyrrolidone to iron(II)

JOURNAL OF ORGANOMETALLIC CHEMISTRY (2009)

期刊

JOURNAL OF ORGANOMETALLIC CHEMISTRY

卷 694, 期 26, 页码 4204-4208

出版社

ELSEVIER SCIENCE SA

DOI: 10.1016/j.jorganchem.2009.09.005

关键词

Iron; N-Methylpyrrolidone; Cross-coupling

类别

Chemistry, Inorganic & Nuclear Chemistry, Organic

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摘要

The use of NMP (N-methylpyrrolidone) as a cosolvent has been shown to improve the yield of iron-catalyzed cross-coupling reactions, but surprisingly there are no iron complexes of NMP in the literature. This paper reports two novel NMP complexes of iron(II): Fe3Cl6(NMP)(8) and (LFe)-Fe-tBu(NMP)Cl (L-tBu = bulky beta-diketiminate ligand). The X-ray crystal structure of Fe3Cl6(NMP)(8) shows an octahedral Fe(NMP)(6)(2+) cation and two tetrahedral FeCl3(NMP) anions. H-1 NMR spectra show that the NMP ligands are labile, exchanging rapidly on the NMR time scale. The beta-diketiminate complex has a trigonal pyramidal geometry with the NMP in an axial position. The use of NMP improves the yield of the catalytic cross-coupling of methyl 4-chlorobenzoate and 1-hexylmagnesium bromide using these and other iron complexes as precatalysts. (C) 2009 Elsevier B.V. All rights reserved.

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