in tetrahydrofuran under N2; to soln. of LiC5H4NMe2 in THF added at -30 °C soln. ofCpTiCl3 in THF, kept for 12 h at room temp.; evapd., extd. (CHCl3), evapd., pptd. (C5H4NMe2)2TiCl2 by addn. of pentane, recrystd. (CHCl3); CHCl3 soln. contained Cp2TiCl2;