Chemistry and Physics Faculty Articles

Title

Intermediates in the Catalytic Dehydrogenative Coupling of Arylgermanes

Document Type

Article

Publication Date

1997

Keywords

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

Publication Title

Chemistry: A European Journal

ISSN

0947-6539

Volume

3

Issue/No.

11

First Page

1793

Last Page

1796

Peer Reviewed

1

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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