New mixed ligand complexes of dicyclopentadienyl titanium(IV) derived from sterically congested heterocyclic β-diketones and N-protected amino acids

Abstract

New mixed ligand monomeric complexes of dicyclopentadienyl titanium(IV) of general formula, $[{\text{TiCp}}_2\{\text{RCOC:}\stackrel{}{\overbracket{\text{C}(\text{O})\text{N}({\text{C}}_{\text{6}}{\text{H}}_{\text{5}})\text{N}:\text{C}}}{\text{CH}}_3\left\}\right\{{\text{O}}_{\text{2}}\text{CCHR}\text{'}\stackrel{}{\overbracket{\text{NC}(\text{O}){\text{C}}_{\text{6}}{\text{H}}_{\text{4}}\text{C}}}(\text{O})\}][\text{where}\hspace{0.17em}\text{R}=-{\text{C}}_{\text{6}}{\text{H}}_{\text{5}},-{\text{CH}}_{\text{3}}\hspace{0.17em}\text{and}\hspace{0.17em}-{\text{C}}_{\text{2}}{\text{H}}_{\text{5}}\hspace{0.17em}\text{and}\hspace{0.17em}\text{R}\text{'}=-{\text{H,-CH}}_{\text{2}}{\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{,-CH}}_{\text{3}}\hspace{0.17em}\text{and}\hspace{0.17em}\text{-CH}{({\text{CH}}_3)}_2]$ have been synthesised by the reaction of titanocenedichloride with sterically congested heterocyclic β-diketones and N-protected amino acids in the presence of triethylamine in refluxing THF. Plausible structures for these mixed ligand complexes have been suggested