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Three-Coordinate, Cyclic Bent Allene Iron Complexes

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journal contribution
posted 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.