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Synthesis and Reactivity of Diborane(4)yl Complexes Holger Braunschweig

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Synthesis and Reactivity of Diborane(4)yl Complexes Holger Braunschweig

a

and Margot Koster

b

aDepartment of Chemistry, Imperial College of Science, Technology, and Medicine, South Kensington, London, SW7 2AY, UK

bInstitut f¨ur Anorganische Chemie der Technischen Hochschule Templergraben 55, D-52056 Aachen, Germany

Reprint requests to Dr. H. Braunschweig. Fax: ++44 (207) 594-5900.

E-mail: h.braunschweig@ic.ac.uk

Z. Naturforsch.57 b,483–487 (2002); received December 19, 2001 Boranes, Diboranes(4), Boryl Complexes

Reaction of various 1,2-dihalodiboranes(4) with Na[(5-C5H4R)M(CO)3] yielded the di- borane(4)yl complexes [X(Me2N)B-B(NMe2)f5-(C5H4R)M(CO)3g] (5, X = Cl, R = H, M = Mo; 6, X = Br, R = Me, M = Mo; 7, X = Br, R = H, M = W; 8, X = Br, R = Me, M = W) and [Cl(C4H8N)B-B(NC4H8)f5-(C5H5)W(CO)3g] (9). The reactivity of di- borane(4)yl complexes of the type [X(Me2N)B-B(NMe2)f5-(C5H5)M(CO)ng] (X = Cl, Br;

M(CO)n = Fe(CO)2, Mo(CO)3) with respect to substitution of X and CO, respectively, was investigated. The novel derivatives [MeO(Me2N)B-B(NMe2)f5-(C5H5)Mo(CO)3g] (10), [MeO(Me2N)B-B(NMe2)f5-(C5H5)Fe(CO)2g] (11), and [Br(Me2N)B-B(NMe2)f5-(C5H5)- Mo(CO)2(PMe3)g] (12) were obtained. All compounds were fully characterised in solution by NMR spectroscopy and by elemental analysis.

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