A potential starting material for the development of new catalysts, the zirconocene-betaine complex 3 was obtained from the zirconocene derivative 1 by func-tionalization of a Cp ligand (via 2). Analogous reactions with metallocenes containing titanium, zirconium, or hafnium are relatively unexplored. RCMeCMeCMeCHMe.
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Ruwwe et al. (1996) studied this question.
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