Synthesis and structures of titanium complexes bearing tetradentate tripodal [O2XC] ligands (X = C, P)

We report the synthesis and structures of titanium complexes supported by tripodal mixed-donor [O₂CC] and [O₂PC] ligands. Stepwise cyclometallation of a chelating bis(phenoxide) complex led to tetradentate binding of the [O₂CC] ligand to the titanium center. Phosphination of a Ti-C bond of the [O₂CC] complex afforded the tripodal [O₂PC] ligand.

Regio- and stereoselective formation of conjugated dienes by titanocene(ii)-promoted alkylation of propargyl carbonates

Conjugated dienes were produced with complete regio- and stereoselectivity by the titanocene(ii)-promoted alkylation of propargyl carbonates via the formation of 2,3,4-trisubstituted titanacyclobutenes.