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(η4-RCHCHCHCHCOOMe)(η5-C5H5)] (M = Rh or Ir; R = Me or Ph) with HPF6 affords crystalline salts [M(η3-RCHCHCHCH2COOMe)(η5-C5J5)]+ PF6− in which the acyl CO group is coordinated to the metal. Base-catalysed hydrolysis of the η4-ester complexes affords the dienoic acid derivatives [M(η4-RCHCHCHCHCOOH)(η5-CH3CH; CHCHCHCOCH3)(η5-C5H5)] with HPF6 proceeds similarly. The 1H NMR spectra of the compounds are reported.