Unusual (fulvene)chromiumcarbonyl complexes

The preparation and characterization of several new and unusual (fulvene)chromiumcarbonyl complexes is reported. η6-Phenyl-coordinated iso-(6,6-diphenylfulvene)Cr(CO)3 (1) is obtained by treatment of (η6-benzophenone)Cr(CO)3 with cyclopentadiene. Tricarbonyl(1-fulvenyl-4,6,8-trimethylazulene)chromium(0) (3) is the first transition metal complex containing a tricyclic fulvenylazulene ligand. P-Coordination without participation of the fulvene ring system has been achieved in the complex (6,6-dimethyl-1-diphenylphosphinofulvene)Cr(CO)5 (4).