FORMATION OF THE METAL-COORDINATED CHELATING BIS-PHOSPHORUS LIGAND PH(2)PN(ET)C(O)PPH(2) VIA A NOVEL [3-CYCLOADDITION BETWEEN THE PHOSPHENIUM COMPLEXES CP(CO)(HPH(2)P)M=PPH(2) (M=MO, W) AND ETHYL ISOCYANATE(2])
W. Malisch et H. Pfister, FORMATION OF THE METAL-COORDINATED CHELATING BIS-PHOSPHORUS LIGAND PH(2)PN(ET)C(O)PPH(2) VIA A NOVEL [3-CYCLOADDITION BETWEEN THE PHOSPHENIUM COMPLEXES CP(CO)(HPH(2)P)M=PPH(2) (M=MO, W) AND ETHYL ISOCYANATE(2]), Organometallics, 14(10), 1995, pp. 4443-4445
Convenient access to the unusual hydride complexes Cp(CO)(H)MPPh(2)C(O
)N(Et)PPh(2) (M = Mo (4a,a'), W (4b,b'), obtained as mixtures of two i
somers, is established via cycloaddition between the phosphenium compl
exes Cp(CO)(HPh(2)P)M = PPh(2) (2a,b) and EtNCO(3), Reaction of 4a,b w
ith carbon tetrachloride yields the analogous chloro complexes Cp(CO)(
Cl)MPPh(2)C(O)N(Et)PPh(2) (5a,a', 5b,b'); 5b' has been characterized b
y X-ray analysis.