摘要:
Thermal reactions of 2H-azaphosphirene metal complexes 1a,b (M = W, Mo) with acetylene ethylcarboxylate led to complexes 5 and 8, which present two different P,C-cage ligands, thus showing a surprising effect of metal-directed synthesis. DFT studies of [(OC)(5)MPC5Me5)] (M = W, Mo) did not yield the expected ground-state structure as implied by the formula; instead complexes having three isomeric ligand structures (2',10 ,11) were obtained, one with a zwitterionic structure (10). These results, combined with calculations of compliance constants, led to a proposal for the first reaction step that is responsible for the metal-mediation of the reaction course.