摘要:
A new type of Ind-NHC ligand precursor (Ind = indenyl), [C9H7-(CH2)(3)-(CH {(NCHCHNPr)-Pr-i})]Br(HL center dot HBr, 1), was designed and prepared. The reaction of in situ generated anionic indenyl-functionalized NHC ligand LLi with (DME)NiCl2 affords a novel mono-ligand Ni(II) bromide, [C9H6-(CH2)(3)-(C{(NCHCHNPr)-Pr-i})]NiBr (2), which was characterized by elemental analysis, NMR and X-ray crystal determination. Complex 2 in combination with NaBPh4 can catalyze the polymerization of styrene at 80 degrees C. (c) 2006 Elsevier B.V. All rights reserved.