in tetrahydrofuran; ethylene glycol dimethyl ether soln. of Ti(CO)3(dmpe)2 in DME stirred under CO for 3 h and then cooled to 0°C; cooled soln. of Na(DME)C5H5 in THF added; mixt. warmed to room temp.; CO replaced by Ar atmosphere; addn. of Et4NBr; filtration, removal of solvents and dmpe in vac.; cryst. product washed with ethanol (0°C) and dried in vac.;

in ethylene glycol dimethyl ether soln. of Ti(CO)3(dmpe)2 in DME stirred under CO at room temp. for 3 h; addn. of Na(DME)(C9H7) in DME at -30°C; soln. slowly warmed to room temp. over a period of 12 h; addn. of Et4NBr; slurry stirred for further 12 h; filtration, redn. of vol., addn. of diethyl ether; ppt. washed with ether and dried in vac.;

in ethylene glycol dimethyl ether soln. of Ti(CO)3(dmpe)2 in DME stirred under CO for 3 h; addn. of K(HBpz3) in DME; after 3 h addn. of Et4NBr; stirring continued for 6 h; filtration, solvent removed in vac. at room temp.; resulting solid washed with toluene, ethanol, and ether; recrystn. from acetonitrile/toluene; elem. anal.;