SUBSTITUENT EFFECTS IN CYCLOPENTADIENYL DERIVATIVES OF TITANIUM AND ZIRCONIUM

Study of ring-substituted π-cyclopentadienyl dichlorides of Ti and Zr shows that the metal-to-ring and metal-to-chloride bonds are sensitive to the donor and acceptor character of the substituent. The preparation of new compounds is reported, namely Cp(Ind)TiCl2 (I), (IndH4)TiCl3 (II) and the oxides [(IndH4)TiCl2]2O (III) and [(IndH4)TiClO]4 (IV) derived from (II), and their NMR spectra are given. The previously reported ABC spectrum of the C5 ring protons in [(IndH4)2ZrCl]2O (V) is further confirmed by spin decoupling experiments. The nonequivalent environments of these protons is suggested as a possible explanation of their peculiar NMR behaviour. © 1969.