SYNTHESE ET ETUDE STRUCTURALE D'UN COMPLEXE MONONUCLEAIRE DU TUNGSTENE PORTANT A LA FOIS UN GROUPEMENT ALKYLIDENE ET UNE DOUBLE LIAISON

Article abstract of DOI:10.1016/S0022-328X(00)86779-0

Reaction of W(CO)6 with 4-penten-1-yllithium and 3-buten-1-yllithium leads after alkylation to the unsaturated alkylidene complexes (CO)5WC(OMe)(CH2)3CHCH2 (6) and (CO)5WC(OEt)(CH2)2CHCH2 (13), respectively.Coordination of the double bonds of complexes 6 and 13 occurs in refluxing benzene and gives the isomerized complex W(CO)4C(OMe)(CH2)2CHCHCH3 (7) and complex W(CO)4C(OEt)(CH2)2CHCH2 (14).An X-ray structure of complex 14 shows that the alkylidene function and the coordinated double bond are perpendicular to each other.