Boron and transition metal compounds derived from 2-uroylbenzimidazole

The coordination sires of 2-uroylbenzimidazole 1 toward diphenylborinic aci d as well as zinc, cadmium, copper: nickel and cobalt chlorides, bromides, and nitrates were investigated The ligand is bonded in monodentate mode to ZnCl2, ZnBr2, CdCl2, CdBr2, and Cd(NO3)(2), and in bidentate mode to all ot hers. With diphenylborinic acid, two heterocycles are formed; in one, the b oron is bonded to imidazole and the terminal NH2 group, and in the other th e boron is bonded to imidazole and to the oxygen atom. Boron, zinc, and cad mium derivatives were studied by NMR spectroscopy. The X-ray diffraction st ructure of 2-uroylbenzimidazole is reported. (C) 1999 John Wiley & Sons, In c.