Diene and dienyl complexes of transition elements: V. Preparation of η-cyclopentadienyl-η-methyl dienoate-rhodium and -iridium complexes: base hydrolysis and protonation studies

Abstract

Reaction of [M(η 4-RCHCHCHCHCOOMe)(η 5-C 5H 5)] (M = Rh or Ir; R = Me or Ph) with HPF 6 affords crystalline salts [M(η 3-RCHCHCHCH 2COOMe)(η 5-C 5J 5)] + PF 6 − in which the acyl CO group is coordinated to the metal. Base-catalysed hydrolysis of the η 4-ester complexes affords the dienoic acid derivatives [M(η 4-RCHCHCHCHCOOH)(η 5-CH 3CH; CHCHCHCOCH 3)(η 5-C 5H 5)] with HPF 6 proceeds similarly. The 1H NMR spectra of the compounds are reported.