EASY ACCESS TO C,C'-BIFUNCTIONALIZED 1H-PHOSPHIRENE-TUNGSTEN COMPLEXES - EVIDENCE FOR AMBIPHILIC REACTION BEHAVIOR OF A PHOSPHANEDIYL-TUNGSTEN COMPLEX

The 2H-azaphosphirene-tungsten complex 1 reacts with ethoxyacetylene 2 a or dimethyl acetylenedicarboxylate 2b to yield C,C'-bifunctionalized 1H-phosphirene-tungsten complexes 4a,b; compounds 4a,b are characteri zed by NMR spectroscopy (C-13, P-31) and complex 4a by single-crystal X-ray diffraction.