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Issue 19, 2006
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Structure and bonding in a cyclobutyl tris(pyrazolyl)boratoniobium complex and the variation in agostic behaviour with ring size in the series TpMe2NbCl(c-CnH2n − 1)(MeC[triple bond, length as m-dash]CMe), n = 3–6

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Abstract

The synthesis and characterisation of the cyclobutyl complex TpMe2NbCl(c-C4H7)(MeC[triple bond, length as m-dash]CMe) completes the family of cycloalkyl complexes TpMe2NbCl(c-CnH2n − 1), n = 3–6. The properties of the cyclobutyl complex are qualitatively similar to those of its cyclopentyl and cyclohexyl analogues, and dramatically different from those of the cyclopropyl derivative. Most conspicuously, the cyclobutyl system has an α-C–H agostic interaction in the dominant isomer, with no evidence for the α-C–C agostic character found for the smaller ring. C–C agostic character therefore seems to be unique to the cyclopropyl complex, where the acute C–C–C angles destabilise the C–C bonding orbitals.

Graphical abstract: Structure and bonding in a cyclobutyl tris(pyrazolyl)boratoniobium complex and the variation in agostic behaviour with ring size in the series TpMe2NbCl(c-CnH2n − 1)(MeC [[triple bond, length as m-dash]] CMe), n = 3–6

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Article information


Submitted
18 Nov 2005
Accepted
08 Feb 2006
First published
24 Feb 2006

Dalton Trans., 2006, 2362-2367
Article type
Paper

Structure and bonding in a cyclobutyl tris(pyrazolyl)boratoniobium complex and the variation in agostic behaviour with ring size in the series TpMe2NbCl(c-CnH2n − 1)(MeC[triple bond, length as m-dash]CMe), n = 3–6

M. Besora, F. Maseras, J. E. McGrady, P. Oulié, D. H. Dinh, C. Duhayon and M. Etienne, Dalton Trans., 2006, 2362
DOI: 10.1039/B516393E

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