Formation of the metal-coordinated chelating bis-phosphorus ligand Ph2PN(Et)C(O)PPh2 via a novel [3 + 2] cycloaddition between the phosphenium complexes Cp(CO)(HPh2P)M=PPh2 (M = Mo, W) and ethyl isocyanate

Article abstract of DOI:10.1021/om00010a001

Convenient access to the unusual hydrido complexes Cp(CO)(H)MPPh₂C(O)N(Et)PPh₂ (M = Mo (4a,a′), W (4b,b′)), obtained as mixtures of two isomers, is established via cycloaddition between the phosphenium complexes Cp(CO)(HPh₂P)M=PPh₂ (2a,b) and EtNCO (3). Reaction of 4a,b with carbon tetrachloride yields the analogous chloro complexes Cp(CO)(Cl)-MPPh₂C(O)N(Et)PPh₂ (5a,a′, 5b,b′); 5b′ has been characterized by X-ray analysis.