A novel unsaturated (alkyne)titanium(II) complex (η5-C5H5)(η5-C5Me5)Ti(Ph–CC–Ph) and its coupling reaction with carbon dioxide

Abstract
The titanium derivatives CpCp′TiX2(Cp η5-C5H5; Cp′=η5-C5Me5; X = Me, Ph, or CO) have been synthesized and the reaction of CpCp′Ti(CO)2 with diphenylacetylene and trimethylphosphine affords the unsaturated (alkyne)titanium(II) complex CpCp′Ti(C2Ph2) which readily adds carbon dioxide to give the metallacyclic compound [graphic omitted] via carbon-carbon bond formation.

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