A novel unsaturated (alkyne)titanium(II) complex (η5-C5H5)(η5-C5Me5)Ti(Ph–CC–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.