n-butyllithium in diethyl ether; hexane; water stirred soln. of C5H6 in ethyl ether (0°C, Schlenk flask), addn. of n-BuLi (hexane), ice bath removed, white ppt., addn. of (3)H2O, stirred for 5 min, addn. of water, ether layer dried, addn. of n-BuLi at 0, of CpTiCl3 at -78°C, stirred; addn. of HCl, org. phase diluted (CH2Cl2), dried over CaCl2, evapn., recrystn. twice from HCl satd. refluxing chloroform; 1H-NMR and m.p. identical to authentic Cp2TiCl2;

in neat (no solvent) equilibrium constant discussed;;