1: With triethylamine in 1,2-dichloro-ethane 0.0166667 h; 2: With titanium tetrachloride in dichloromethane; 1,2-dichloro-ethane T=20°C; 3: With water; sodium cyanoborohydride; sodium hydrogencarbonate more than 3 stages;

in methanol

boron trifluoride diethyl etherate in dichloromethane

cyclohexa-1,4-diene; acetic acid; palladium on activated charcoal T=60°C; 3 h;