The ¹³C N.M.R. spectra of some arenetricarbonylchromium compounds, and their dicarbonyl triphenylphosphine, triphenyl phosphite and diphenylphosphinite analogues, including chelate compounds

Abstract

A number of new arenetricarbonylchromium compounds have been synthesized in which the arene ring is substituted with a number of large groups such as t-butyl. Also prepared were the Ph₃PCr(CO)₂ and (PhO)₃PCr(CO)₂ analogues of these compounds and of more lightly substituted arenes, and a number of chelate compounds incorporating a short chain attached at C1 of the arene and bonded to chromium by phosphine, phosphite or phosphinite phosphorus atoms. The ¹³C n.m.r. spectra of these compounds have been recorded, and examined for evidence of stereo-specific influences of phosphorus on the chemical shifts of the arene ring carbons, but no such effects were found. ³¹P n.m.r. chemical shifts are also reported for these compounds.