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Cationic η 2 -thiocarbene complexes of molybdenum and tungsten [Cp(CO)PMe 3[BF 4 ] (R = Me, Ph, Tol) add N 3 COOMe to the electron rich metal carbon double bond to yield the corresponding bicyclic system. The products have been characterized by  1 H,  13 C,  31 P NMR, IR and mass spectra. The crystal structure of 4b has been determined: space group P2 1 /n with a = 1749.9(7), b = 827.9(1), c = 1846.8(7) pm and Z = 4.

zeitschrift für naturforschung b

Zur Cycloaddition von Azidoameisensäuremethylester an die Metall-Carben-Doppelbindung in η 2 -Thiocarbenkomplexen des Molybdäns und Wolframs / Cycloaddition of Azidoformic Acid Methylester to the Metal Carbon Double Bond of η 2 -Thiocarbene Complexes of Molybdenum and Tungsten