Issue 28, 2011

Tris(pyrazolyl)borate amidoborane complexes of the group 4 metals

Abstract

Treatment of the tris(pyrazolyl)borate metal triamides Tp′M(NMe2)3, where Tp′ = (C3H3N2)3BH (Tp) or (3,5-Me2C3HN2)3BH (Tp*) and M = Ti, Zr and Hf, with the Brønsted acidic Lewis adduct (C6F5)3B·NH3 in toluene solution leads to the formation of Tp′M(NMe2)2{NH2B(C6F5)3} complexes. The exception to this was the attempted preparation of Tp*Ti(NMe2)2{NH2B(C6F5)3} which was unsuccessful. Where Tp′ = Tp and M = Ti and Zr and where Tp′ = Tp* and M = Zr the complexes have been characterized by single crystal X-ray diffraction methods, revealing the first examples of octahedral amidoborane complexes of the group 4 metals. Attempts to drive the reactions to completion resulted in competing preferential hydrolysis of the amidoborane group, regenerating (C6F5)3B·NH3.

Graphical abstract: Tris(pyrazolyl)borate amidoborane complexes of the group 4 metals

Supplementary files

Article information

Article type
Paper
Submitted
19 Apr 2011
Accepted
24 May 2011
First published
20 Jun 2011

Dalton Trans., 2011,40, 7434-7441

Tris(pyrazolyl)borate amidoborane complexes of the group 4 metals

A. Fuller, D. L. Hughes and S. J. Lancaster, Dalton Trans., 2011, 40, 7434 DOI: 10.1039/C1DT10709G

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