Manganese complex containing a bidentate 2,2-dicyanovinylphosphonato ligand formed by a novel variant of the Michaelis–Arbusov reaction; the X-ray crystal structure of [{(NC)2CCP(O)}(OCHMe2)2Mn(CO)2(Ph2PCH2CH2PPH2)]

Abstract

U.v. irradiation of fac-[(NC)₂CC(Cl)Mn(CO)₃(dppe)](dppe = Ph₂PCH₂CH₂PPh₂) with excess of triisopropyl phosphite results in elimination of both isopropyl chloride and carbon monoxide to give [(NC)₂CCP(O)(OCHMe₂)₂Mn(CO)₂(dppe)] which is shown by X-ray diffraction to contain a bidentate 2,2-dicyanovinylphosphonato ligand bonded to the manganese both through a vinylic carbon and the phosphoryl oxygen to give a four-membered MnCPO chelate ring.