Interaction of carbon dioxide with acetylene complexes of titanocene Cp2Ti(RC2R) (R Ph, SiMe3). Synthesis and structure of binuclear σ-alkenylcarboxylate complexes of titanium (III) Cp2TiC(R)C(R) COOTiCp2 and unexpected transformation of these complexes into titanafuranone metallacycles under the ac

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