1: With titanium(IV) isopropylate in diethyl ether T=20°C; 0.5 h; 2: With boron trifluoride diethyl etherate in diethyl ether T=20°C; 0.166667 h; Further stages.;

titanium(IV) isopropylate in diethyl ether T=20°C; 0.5 h;