Reaction of a rhodium(I) carbonyl complex of a para-dimethylaminophenyl substituted diphosphine with methyl iodide and hydrogen iodide

Gareth W. Lamb, Dave Law, Alexandra M. Z. Slawin, Matt Clarke

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Reaction of [Rh(CO)(2)](mu-Cl)](2) with bis-1,2-(di{4-dimethylaminophenyl)phosphino-ethane (L) gives the monomeric Rh(I) complex of type cis-[RhCl(L)(CO)] that was separated from a side product of type [Rh(L)(2)] Cl, and characterised by X-ray crystallography. This complex reacts with methyl iodide at high temperature to give the Rh(III) acetyl complex, [Rh(I)(2)(C(O)Me)(L)], which was also structurally characterised by X-ray crystallography. There is no sign of quaternisation of the dimethylamino groups under these conditions. This complex is soluble in organic solvent and insoluble in the polar media used in methanol carbonylation (AcOH/H2O/MeOH). However, in the presence of HI, this complex is readily soluble in AcOH/H2O/MeOH, in contrast to [Rh(I)(2)(C(O) Me)(dppe)] and most other Rh-acetyl complexes of diphosphine ligands. (C) 2009 Elsevier B. V. All rights reserved.

Original languageEnglish
Pages (from-to)4263-4267
Number of pages5
JournalInorganica Chimica Acta
Volume362
Issue number11
DOIs
Publication statusPublished - 15 Aug 2009

Keywords

  • Rhodium
  • Methanol carbonylation
  • Oxidative addition
  • Water-soluble ligands
  • Phosphines
  • WATER-SOLUBLE PHOSPHINES
  • METHANOL CARBONYLATION
  • HYDROFORMYLATION CATALYSTS
  • AQUEOUS-MEDIA
  • LIGANDS
  • DERIVATIVES
  • IMMOBILIZATION
  • EFFICIENT

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