Mono- and bi-dentate Group 6-coordinated and titanium-containing isocyanide ligands prepared from benzoxazole

Abstract

Reaction of lithiated benzoxazole with Group 6 carbonyl complexes and subsequently with Cp₂TiCl₂ affords bimetallic systems in which the titanium is O-bonded and the Group 6 metal isocyanide-coordinated. Depending on starting material and reaction conditions the cyclopentadienyl titanium complex may act as either a mono- or bi-dentate ligand. Crystal and molecular structures of [(CO)₅Cr{CN(C₆H₄-o)O}Ti(Cl)Cp₂] (1) and [(CO)₄Cr{CN(C₆H₄-o)O}₂TiCp₂] (2), are reported. The heterometallacyclic ring in 2 contains 12 atoms.