magnesium in tetrahydrofuran N2 atmosphere; Mg stirring (24 h, room temp.); solvent removal (vac.), extn. (pentane), recrystn. (pentane), sublimation (100 - 150°C, 0.1 mm Hg); elem. anal.;

in tetrahydrofuran Ar-atmosphere; dropwise addn. of K2C8H8 to Ti-complex (during 30 min), stirring (room temp., 90 min), refluxing (15 min); solvent removal (reduced pressure), sublimation (120°C/0.2 Torr); elem. anal.;