Issue 34, 2007
From the journal:

Dalton Transactions

Hydrodefluorination of pentafluoropyridine at rhodium using dihydrogen: detection of unusual rhodium hydrido complexes†

Thomas Braun,*a   Daniel Noveski,b   Marcel Ahijadoa  and  Falk Wehmeierb  

* Corresponding authors

a Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany

b Fakultät für Chemie, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany
E-mail: thomas.braun@chemie.hu-berlin.de

Abstract

The pentafluoropyridyl complex [Rh(4-C5NF4)(PEt3)3] (3) reacts with H2 to give initially the dihydrido complex cis-mer-[Rh(H)2(4-C5NF4)(PEt3)3] (6). Within a few hours 2,3,5,6-tetrafluoropyridine as well as two rhodium(III) complexes mer-[Rh(H)3(PEt3)3] (mer-7) and fac-[Rh(H)3(PEt3)3] (fac-7) are formed. A catalytic C–F activation process for the formation of 2,3,5,6-tetrafluoropyridine starting from pentafluoropyridine and dihydrogen using 3 as a catalyst has been developed. Reaction of [RhH(PEt3)3] (1) with hydrogen affords fac-[Rh(H)3(PEt3)3] (fac-7) and mer-[Rh(H)3(PEt3)3] (mer-7) in a ratio of 1 : 7.25 at 193 K. The latter complex represents the first mononuclear rhodium compound bearing trans-hydrides.

Graphical abstract: Hydrodefluorination of pentafluoropyridine at rhodium using dihydrogen: detection of unusual rhodium hydrido complexes

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Article information

DOI
https://doi.org/10.1039/B706846H
Article type
Paper
Submitted
08 May 2007
Accepted
19 Jun 2007
First published
10 Jul 2007

Dalton Trans., 2007, 3820-3825

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Hydrodefluorination of pentafluoropyridine at rhodium using dihydrogen: detection of unusual rhodium hydrido complexes

T. Braun, D. Noveski, M. Ahijado and F. Wehmeier, Dalton Trans., 2007, 3820 DOI: 10.1039/B706846H

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