in tetrahydrofuran under Ar using Schlenk techniques; soln. of Ti(N(SiMe3)CH2CH2C5H4N)Cl3 in THF cooled to -95°C; soln. of NaC5H5 in THF added dropwise; mixt. stirred for 5.5 h; slowly warmed to room temp.; ppt. filtered off; volatiles removed; residue washed (n-hexane); extd. (EtO2); solvent removed; elem. anal;