Chemistry and Physics Faculty Articles

Title

Intermediates in the Catalytic Dehydrogenative Coupling of Arylgermanes

Document Type

Article

Publication Date

1997

Publication Title

Chemistry: A European Journal

Keywords

Dehydrogenative coupling, Germanium, Platinum, Reaction mechanisms, Structure elucidation

ISSN

0947-6539

Volume

3

Issue/No.

11

First Page

1793

Last Page

1796

Abstract

The use of a new electron-withdrawing germane, H2Ge[3,5-(CF3)2C6H3]2 (3), has facilitated the isolation and characterization of three new complexes implicated in the dehydrogenative coupling of bisarylgermanes by Pt0-phos-phane complexes. The intermediates include a digermyl species, trans-[(Et3P)2Pt{GeH(Ar)2}2] (7), a bound digermane showing the first stage of Ge-Ge catenation, cis-[(Et3P)2Pt(H){Ge(Ar)2-GeH(Ar)2}] (8), and the Ge-H activated form of this product, [(Et3P)2HPtGe(Ar)2-Ge(Ar)2PtH(PEt3)2] (6). Complexes such as 6 and 8 have not previously been isolated as intermediates in dehydrogenative coupling reactions. An X-ray crystal structure was determined for complex 6, confirming the cis geometry of the hydrogen and germanium ligands; this provides yet another example of the stability of germyl hydrides towards reductive elimination. A similar cis geometry was observed for complex 8. Performing the dehydrogenative coupling reaction under a CO2 atmosphere failed to yield any products containing trapped germylene species.

Comments

©WiLEY-VCH Verlag GmbH, 69451 Weinheim 1997

DOI

10.1002/chem.19970031110

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Peer Reviewed

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