Three-Coordinate, Cyclic Bent Allene Iron Complexes
2013-05-13T00:00:00Z (GMT) by
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 FeCl<sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub> results in the loss of both phosphines to yield monomeric Fe(CBA)Cl<sub>2</sub>. Treatment with 2 equiv of benzyl Grignard affords the three-coordinate alkylated product Fe(CBA)(Bn)<sub>2</sub>. 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)<sub>4</sub>.