Tabbe's reagent (Cp2TiCH2·AlMe2Cl) or titanocene metallacyclobutanes react with nitriles in the presence of a Lewis base such as trimethylphosphine to afford vinylimido complexes of titanocene; these undergo follow-up reactions with unsaturated organic molecules to yield new heterocyclic compounds of titanocene.
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Doxsee et al. (1990) studied this question.
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