SYNTHESIS AND STRUCTURE OF THE FIRST ETA(1)-BORAZINE COMPLEXES

A series of eta(1)-borazine complexes were obtained by the reaction of trichloroborazine with Na[(eta(5)-C5R5)Fe(CO)(2)]. The compounds [{(C 5R5)(CO)(2)Fe}(n)Cl3-nB3N3H3] (1a, n = 1, R = Me; 1b, n = 2, C5R5 = C5 H4Me; 1c, n = 3, R = H) have one to three iron-boron sigma bonds and F e-B pi-interactions can be ruled out from the spectroscopic and struct ural results. All new borazine complexes were isolated as orange cryst alline solids and characterized by multinuclear NMR methods and IR spe ctroscopy. The structure of Ib in the crystalline state was also deter mined by a single-crystal X-ray study.