Preparation of molybdenum(II) η2-vinyl complexes via sequential C - Cl activation and alkyne insertion

Article abstract of DOI:10.1016/0277-5387(96)00311-7

Reaction of the Schiff base ligand 1, prepared by the condensation of 2-chlorobenzaldehyde and N,N-dimethylethylenediamine with (η⁶-C₆H₅CH₃)Mo(CO)₃ 2 resulted in the formation of the seven-coordinate molybdenum(II) metallacycle, 3, by oxidative addition of the strong aromatic C - Cl bond at molybdenum(0). The metallacycle 3 undergoes migratory insertion with electron-deficient internal acetylenes to afford novel η²-vinyl complexes 4, resulting in net replacement of a C - Cl bond by a C - C bond. Copyright