1: POCl3 / 0.5 h / Ambient temperature 2: 2) sodium acetate trihydrate, H2O / 1) 1,2-dichloroethane, reflux, 5 h, 2) reflux, 90 min View Scheme

water; sodium acetate 1) 1,2-dichloroethane, reflux, 5 h, 2) reflux, 90 min; Yield given. Multistep reaction. Yields of byproduct given;