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Issue 32, 2013
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Activation of a (cyclooctadiene) rhodium(i) complex supported by a chiral ferrocenyl phosphine thioether ligand for hydrogenation catalysis: a combined parahydrogen NMR and DFT study

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Abstract

The reaction of [RhCl(P,StBu)(COD)] (1) or [Rh(P,StBu)(COD)]BF4 (2) where (P,StBu) is CpFe[η5-1,2-C5H3(PPh2)(CH2StBu)] with H2 in MeOH gives rise to COD hydrogenation and formation of a solvent-stabilized product. The formation of hydride species cannot be observed in view of a very rapid H/D exchange between H2 and the solvent. Introduction of pyridine or acetonitrile slows down this exchange process and allows observation of diastereometric dihydride complexes, [Rh(P,StBu)(H)2(L)2]+, the stereochemistry of which was fully elucidated. The hydride site exchange rates have been derived from EXSY NMR experiments and used, with assistance from DFT calculation, to elucidate the isomerization and site exchange mechanisms.

Graphical abstract: Activation of a (cyclooctadiene) rhodium(i) complex supported by a chiral ferrocenyl phosphine thioether ligand for hydrogenation catalysis: a combined parahydrogen NMR and DFT study

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Article information


Submitted
31 May 2013
Accepted
24 Jun 2013
First published
24 Jun 2013

Dalton Trans., 2013,42, 11720-11730
Article type
Paper

Activation of a (cyclooctadiene) rhodium(I) complex supported by a chiral ferrocenyl phosphine thioether ligand for hydrogenation catalysis: a combined parahydrogen NMR and DFT study

E. M. Kozinets, M. Fekete, O. A. Filippov, N. V. Belkova, E. S. Shubina, R. Poli, S. B. Duckett and E. Manoury, Dalton Trans., 2013, 42, 11720
DOI: 10.1039/C3DT51429C

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