The stereochemistry of organometallic compounds. XIV. trans-Effects in the ¹³C N.M.R. spectra of Dicarbonyltriphenyl-phosphine- and -arsine-(arene)chromium compounds

Abstract

The ¹³C chemical shifts of some triphenyl-phosphine and -arsine dicarbonyl(arene)chromiums are reported. The shifts are discussed in terms of a deshielding effect on the arene ring carbons trans to the Group 5 atom in the preferred conformations of these molecules.