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As compounds with characteristics of Wittig and Tebbe reagents, titanacycles 1 (X = Cl, NMe2) can function as synthetic equivalents of carbon atoms because of the oxophilicity of the P and Ti centers. In fact, complexes 1 react with electron-rich aromatic aldehydes (Ar = 4-MeC6H4, 4-MeOC6H4) to give the allenes 2.
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Hughes et al. (1993) studied this question.
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