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Equilibria between alpha- and beta-agostic stabilized rotamers of secondary alkyl niobium complexes.

Abstract:

The isopropyl chloro complex Tp(Me2)NbCl(i-Pr)(PhCandtbd1;CMe) (2) [Tp(Me2) = hydrotris(3,5-dimethylpyrazolyl)borate] exhibits a beta-agostic structure in the crystal. The conformation of the alkyl group is such that the agostic methyl group lies in the Calpha-Nb-Cl plane and the nonagostic one, in a wedge formed by two pyrazole rings. As observed by solution NMR spectroscopy, restricted rotation about the Nb-C bond allows the observation of an equilibrium between this species, 2beta, and a m...

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Publication status:
Published

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Publisher copy:
10.1021/ja0038169

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Journal:
Journal of the American Chemical Society
Volume:
123
Issue:
25
Pages:
6000-6013
Publication date:
2001-06-05
DOI:
EISSN:
1520-5126
ISSN:
0002-7863
URN:
uuid:91cff300-27ea-477d-9cdd-11873ddc1b10
Source identifiers:
51660
Local pid:
pubs:51660
Language:
English

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