Synthesis and Characterization of Diorganocobalt Chlorides by Aliphatic Vinylic C-Cl Bond Activation

摘要

Three diorganocobalt chlorides [CoClMe(PMe3)(2)-{(C5H6)-CH=O}] (4), [CoClMe(PMe3)(2)-{(C6H8)-CH=O}] (5), and [CoClMe(PMe3)(2)-{(C(6)H(7)Memeta)-CH=O}] (6) were synthesized through cyclometalation reactions with aldehyde as an anchoring group involving aliphatic vinylic C-Cl bond activation. Complexes 4-6 were characterized by IR and NMR spectroscopy. The crystal and molecular structures of complexes 4 and 5 were determined by single-crystal X-ray diffraction. Complexes 4-6 are stable in solution at room temperature, but they decompose at above 30 degrees C affording C,C-couplings products with the formation of [Co(PMe3)(3)Cl]. The results of this work will be important for people to deepen the understanding of the C-Cl bond activation mechanism.