Evidence for correlated rotation and diastereoisomer discrimination in (η4-diene)Fe(CO)2L complexes: the crystal and solution structures of (cyclohexadiene)Fe(CO)2P(o-tolyl)3 and (cycloheptadiene)Fe(CO)2(+)-PPh2(neomenthyl)

Article abstract of DOI:10.1016/0022-328X(91)80056-P

The solid state structure of (cyclohexadiene)Fe(CO)2P(o-tolyl)3 reveals an exo₂ conformation for the phosphine.In solution, arene ring exchange in the phosphine and exchange of phosphine between equivalent basal positions of the square pyramid occur at equal rates.In solution, (cycloheptadiene)Fe(CO)2(+)-PPh2(neomenthyl) exhibits a diastereoselection between basal isomers, and crystallizes as a single diastereoisomer which has been structurally characterized.