Stereoselective carbon–carbon bond formation via alkylation of [(η-5C5H5)Fe(PPh3)(CO)(COMeCHR)](R = Me,Prn,Ph): X-ray crystal structure of (Z)-[(η5-C5H5)Fe(PPh3)(CO)(COMeCHMe)]

Abstract

[(η-²C₅H₅)Fe(PPh₃)(CO)(Mthoxycarbene)]⁺ complexes, prepared either from terminal acetylenes or from the corresponding acyl complexes, are stereoselectively deprotonated, as evidenced by the crystal structure of (Z)-[(η⁵-C₅H₅)Fe(PPh₃)(CO)(COMeCHMe)], to (Z)-methoxyvinyl complexes which can be stereoselectively alkylated under mild conditions to give elaborated acyl complexes.