ansa-Chromocenes: An alternative route to Me2Si(C5Me4)(2)Cr

作者：Charbonneau Fabien; Oguadinma Paul O; Schaper Frank^*

来源：Inorganica Chimica Acta, 2010, 363(8): 1779-1784.

DOI：10.1016/j.ica.2010.02.034

• X-ray crystal structures
• Chromium complexes
• ansa-Chromocenes

The mechanism for the preparation of Me2Si(C5Me4)(2)Cr, 1, from CrCl2(THF)(x) and Me2Si(C5Me4)(2)Li-2 was investigated and-in contrast to earlier claims-no evidence was found for the participation of an auxiliary ligand. The formation and stability of 1 is attributed to the combination of correct reaction conditions and a highly substituted ligand framework. Reactions with other ligands under identical conditions did not lead to the formation of ansa-chromocenes. Reaction with H(4)C(2)Ind(2)Li(2) afforded the eta(3)-Ind bridged dimer {H4C2(eta(5)-Ind)(mu-, eta(3)-Ind)Cr}(2), 9. Complex 1 does not coordinate PPh3 or carbenes, but from reaction with two equivalents of xylyl isocyanide the CH-activated complex Me2Si(C5Me4)(eta(C5Me4)-C-3(eta(3)- H)(H)(=CH2)Cr(CNC6MeH3)(2), 7, was obtained. Complexes 7 and 9 were characterised by X-ray crystallography.

• 出版日期2010-5-5