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Deprotonation of the aminofulvene 1 with LiCH(SiMe3)2 provides 2, which reacts with MCl4 (M=Zr or Hf) by intramolecular NMe2H elimination and coupling of the fulvene moieties to form complex 3 or 4. This reaction is a useful synthetic pathway to allyl-bridged ansa-metallocenes, especially those with a conjugated 14 π electron system. R′=dimethylamino.
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Bai et al. (1999) studied this question.
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