1: With phosphorus pentachloride in benzene 1 h; Heating; 2: With triethylamine in diethyl ether 6 h; Heating;

1: With DMEG in dichloromethane T=0°C; Substitution; 0.5 h; 2: With triethylamine in dichloromethane T=0°C; Elimination; 3 h;