selenium; n-butyllithium; oxygen in diethyl ether; hexane Ambient temperature1.) 24 h; 2.) 0.5 h; 3.) 0.5 h;

1: benzyl-N,N-dimethylamine With n-butyllithium in diethyl ether; hexane T=27°C; 24 h; 2: selenium in diethyl ether; hexane T=27°C; 0.5 h; Inert atmosphere;

1: With n-butyllithium in water 2: With selenium 3: With oxygen in water Further stages.;