Synthesis and Structure of Pentamethylcyclopentadienyl Tungsten(V) Complexes Containing Functionalized 6,12-Epiiminodibenzo[b,f][1.5]diazocine Ligands

2-Amino-3,5-dibromobenzaldehyde [3,5-Br 2 -2-H 2 NC 6 H 2 CHO] undergoes a self-condensation reaction in the presence of o- or m -anthranilic acid, affording the novel ligand systems [ o- or m -(HO 2 C)C 6 H 4 (μ 3 -N)L] (L = [3,5-Br 2 -2-HNC 6 H 2 CH] 2 ). Further interaction with [Cp*WCl 4 ] in refluxing toluene affords the tungsten(V) complexes [Cp*WCl 3 (η 2 -O 2 C)C 6 H 4 (μ 3 -N)L], the X-ray crystal structures of which show pseudo-octahedral tungsten centers with the chelating syn carboxylate group of the new ligand system and a mer arrangement of chlorine atoms forming the base and an η 5 - (for 1·MeCN ) or slipped, η 3 - (for 2·3MeCN ) C 5 Me 5 ligand at the apex.