RAPID INTRAMOLECULAR INTERACTIONS BETWEEN ORGANIC ISOCYANATES AND HEXAFLUOROBUT-2-YNE ON A DIRHODIUM CENTRE; X-RAY CRYSTAL STRUCTURE OF (η-C5H5)2Rh22(η3-C(CF3)C(CF3)C(O)N(Ph)>

Article abstract of DOI:10.1016/0022-328X(84)80080-7

Complexes of formula (η-C5H5)2Rh2 have been prepared by three methods, from reactions between organic isocyanates and (η-C5H5)2Rh2(CO)(CF3C2CF3) or (η-C5H5)2Rh2(CO)2(CF3C2CF3); by trteatment of (η-C5H5)2Rh2(CO)(CF3C2CF3) with organic azides; and by oxidation with Me3NO of the organic isocyanide in (η-C5H5)2Rh2(CO)(CNR)(CF3C2CF3).The crystal and molecular structure of the complex (η-C5H5)2Rh2 with R = Ph has been determined from single crystal X-ray diffraction data.This reveals that the isocyanate has condensed with the hexafluorobut-2-yne to form an amide ligand of the form C(CF3)C(CF3)C(=O)N(R); this bridges the two rhodium atoms in a μ₂η³-manner.