Three-Coordinate, Cyclic Bent Allene Iron Complexes
journal contributionposted on 13.05.2013, 00:00 by Conor Pranckevicius, Douglas W. Stephan
Novel three-coordinate Fe complexes featuring 1,2-diphenyl-3,5-bis(2,6-dimethylphenoxy)pyrazolin-4-ylidine or “cyclic bent allene” (CBA) have been synthesized. Reaction with FeCl2(PPh3)2 results in the loss of both phosphines to yield monomeric Fe(CBA)Cl2. Treatment with 2 equiv of benzyl Grignard affords the three-coordinate alkylated product Fe(CBA)(Bn)2. Exposure of the alkylated species to an atmosphere of CO results in reductive elimination of 1,3-diphenylpropanone and formation of trigonal-bipyramidal Fe(CBA)(CO)4.