1: cyclobenzothiazole With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.166667 h; 2: tributyltin chloride in tetrahydrofuran; hexane T=-78 - 20°C; 3.5 h;

n-Buli in tetrahydrofuran; diethyl ether; hexane under N2, addn. of soln. of n-Buli in hexane to soln. of benzothiazole in THF during 1 h, stirring for 1 h at -10 ° C for 1 h, addn. of soln. of tributyltin chloride in Et2O during 1 h, warming up to room temp.; filtration, evapn., distn., elem. anal.;