A new synthetic route to functionally substituted (η5-cyclopentadienyl) dicarbonyliridium compounds

Article abstract of DOI:10.1016/0022-328X(95)05627-2

A series of functionally substituted (η⁵-cyclopentadienyl)dicarbonylirridium compounds have been prepared from reactions of the corresponding substituted cyclopentadienyl-sodium, -lithium, or -thallium reagents with chlorodicarbonyl(pyridine)iridium.Ring-substituted compounds synthesized by this route include chloro, benzyl, pentabenzyl, acetyl, carbometoxy, methyl, benzoyl, trimethylsilyl, cyano, dimethylamino, tetraphenyl, dimethylaminoethyl, (tetramethyl)dimethylaminoethyl, methoxyethyl and pentamethyl.The symmetric and asymmetric carbonyl stretching frequencies as well as the 13C NMR chemical shifts of the carbonyl substituents have been correlated with various Hammett substituent parameters.Keywords: Iridium; Substituted (cyclopentadienyl(dicarbonyliridium compounds; Synthesis; 13C NMR spectra; Hammett substituent parameters