SYNTHESIS AND REACTIVITY OF TITANIUM(II) ARENE COMPLEXES

The synthesis of the arene derivatives of titanium(II), Ti($-arene)[(~-X)2(AlX2)]2 (X = Br, I) from reaction of TiX,, AlX,, and Al with the parent arene is described, and their reactions are reported. Treatment of Ti( $-arene)[( P-X) 2(AlX 2)] 2 with carbon monoxide at low temperature has given the dicarbonyl derivatives {Ti( #- arene)(CO),@X),(AlX,)]} AK, (X = Br, I). The room temperature, AlX,-mediated carbonylation of toluene, which is in competition with the formation of titanium(II) carbonyl complexes, has been studied. Treatment of Ti( $-arene)[( p- X),(AlX,)], (X = Cl, Br), with TlCp (Cp = $-cyclopentadienyl) and carbon monoxide at room temperature and atmospheric pressure has given TiCp,(CO), in good yields.