CHEMISTRY OF 2H-AZAPHOSPHIRENE COMPLEXES - 9 - SYNTHESES OF 3-PHENYL-2H-AZAPHOSPHIRENE CHROMIUM AND MOLYBDENUM COMPLEXES - FIRST EVIDENCE FOR REACTION INTERMEDIATES

The synthesis of 8-phenyl-substituted 2H-azaphosphirene pentacarbonylc hromium and pentacarbonylmolybdenum complexes is reported. New informa tion on the rearrangement cascade, which finally leads to 2H-azaphosph irene ring formation, has been obtained through isolation of a reactiv e intermediate. A comparison of the C-13-, N-15-, P-31-NMR, and UV/vis spectroscopic data and single crystal X-ray structural data of 3-phen yl-substituted 2H-azaphosphirene chromium, molybdenum, and tungsten co mplexes is presented.