sodium in tetrahydrofuran; benzene byproducts: NaCl; to metallic Na in THF t-BuC5H5 added at -20°C; after 2 h n-BuCl in THF added dropwise; stirred for 10 h; NaCl filtered off; TiCl4 in THF/benzene added at 0°C to the filtrate; stirred for 3 h at -20°C; satd. with dry HCl; solvent evapd. in vacuo; residue extd. (HCl-satd. CHCl3); recrystd. (CHCl3); elem. anal.;

in tetrahydrofuran under Ar, addn. of TiCl4 to a THF soln. at 0°C, dropwise addn. of (C5H4CMe3)Li in THF, allowed to warm to room temp., stirred for 2 h; addn. of heptane, pptn. filtered off in air, recrystn. (CHCl3);

in tetrahydrofuran adding ((tBuCp)2TiCl)2 in THF to freshly sublimated S8 under stirring at room temp. , react. time: 3d , argon atmosphere; equil.; flash chromatography, elem. anal.;