in toluene evacuated glass tubes, 90-100°C, 2 h, cooling; product formed on ampule walls;

in toluene byproducts: dioxane; standing (room temperature, 24 h); liquid chromy.;

in toluene byproducts: dioxane; standing (room temperature, 24 h); liquid chromy.;

ethanol in ethylene glycol dimethyl ether; ethanol to educts added DME-EtOH mixt., kept for 5 min at 20°C; ppt. isolated, soln. evapd., washed with hexane at 0°C, recrystd. from toluene, mother liquor cooled at -78°C for 24 h, ppt. isolated, evapd.;

heating in N2 atm. at 220-230°C for 30 min, distn. at 10-15 Torr at 170-180°C;

palladium 10 on activated carbon in N,N-dimethyl acetamide T=60°C; Suzuki-Miyaura coupling; 24 h;