The interaction of C7H8Mo(CO)4 with 2 equivalents of Ph2P(C5H5) in hexane at -2°C gives two isomers of cis-[Ph2P(C5H5)]2Mo(CO)4 (II and III) in high yield. In toluene, the coordinated Ph2P(C5H5) ligands of II and III undergo intramolecular Diels-Alder dimerization at room temperature producing cis-[1,3-bis(diphenylphosphino) dicyclopentadiene](tetracarbonyl)molybdenum (IV) in quantitative yield. Compound IV can also be prepared in high yield by the interaction of cis-Mo(CO)4(Ph2PCl)2 with 2 equivalents of (C5H5)Tl in refluxing toluene. Pyrolysis of IV gives a hexane solvate 2[(C5H5)Mo]2(μ-PPh2) 2(CO)(O)·C6H14 (VI) in low yield, the structure of which was determined by X-ray crystallography.
Scopus Subject Areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry