Complexes of trivalent phosphorus derivatives. III. Metal carbonyl complexes of 9-phenyl-9-phosphabicyclo[4.2.1]nonatriene

Article abstract of DOI:10.1021/ic50060a021

The reactions of various metal carbonyl derivatives with the novel unsaturated tertiary phosphine 9-phenyl-9-phosphabicyclo[4.2.1]nonatriene (C₈H₈PC₆H₅) have been investigated. Cycloheptatrienetricarbonylmolybdenum reacts with C₈H₈PC₆H₅ at room temperature to give pale yellow cis-(C₈H₈PC₆H₅) ₂Mo(CO)₃ where one of the two ligands is bonded to the metal atom through its phosphorus atom and one of its double bonds. In all other complexes of C₈H₈PC₆H₅ prepared in this work, only the phosphorus atom of this ligand is bonded to the metal atom. Hexacarbonylchromium reacts with C₈H₈PC₆H₅ to form a mixture of (C₈H₈PC₆H₅)Cr(CO)₅ and trans-(C₈H₈PC₆H₅) ₂Cr(CO)₄. Hexacarbonylmolybdenum reacts withC₈H₈PC₆H₅ to give a mixture of (C₈H₈PC₆H₅)Mo(CO)₅ and cis-(C₈H₈PC₆H₅) ₂Mo(CO)₄; however, the latter compound is better prepared from C₈H₈PC₆H₅ and cycloheptatrienetricarbonylmolybdenum at 100°. The monosubstituted yellow iron complex (C₈H₈PC₆H₅)Fe(CO)₄ may be prepared from Fe(CO)₅ and C₈H₈PC₆H₅ and the deeper yellow, relatively unstable, disubstituted iron complex trans-(C₈H₈PC₆H₅) ₂Fe(CO)₃ from Fe₂(CO)₉ or C₈H₈Fe(CO)₃ and C₈H₈PC₆H₅. The mercury derivatives Hg[Fe(CO)₃NO]₂ and Hg[Co(CO)₄]₂ react with C₈H₈PC₆H₅ to form orange Hg[Fe(CO)₂(NO)(C₈H₈PC₆H ₅)]₂ and yellow Hg[Co(CO)₃(C₈H₈PC₆H ₅)]₂, respectively.