A. Lennartsson, Anna Hedström, M. Håkansson
Jan 11, 2010
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0
Influential Citations
12
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Journal
Organometallics
Abstract
Di-sec-butylzinc has been used to synthesize [Zn(s-Bu)2L2] complexes, where L denotes amine ligands: e.g., pyridine (py), 2-picoline (2-pic), and 3-picoline (3-pic). The crystal structures of [Zn(s-Bu)2(py)2] (1), [Zn(s-Bu)2(2-pic)2] (2), and [Zn(s-Bu)2(3-pic)2] (3) were determined. Reaction of di-sec-butylzinc with the bidentate amine ligands N,N,N′,N’-tetramethylethylenediamine (TMEDA) and N,N,N′,N’-tetraethylethylenediamine (TEEDA) afforded the chiral complexes [Zn(s-Bu)2(tmeda)] (4) and [Zn(s-Bu)2(teeda)] (5); their crystal structures were determined. Since they coordinate two s-Bu groups each, complexes 1−5 may exist both as chiral and meso molecules in solution, but the crystalline complexes were found to be exclusively chiral. The enantiomerization rate of 1−5 in benzene was found to be slow on the NMR time scale. Chiral crystalline complexes containing the Zn(s-Bu)2 moiety are of particular interest, since they display reactive chirogenic α-carbon atoms. The identification of a Zn(s-Bu)2 complex s...