1: N,N'-diethyl acetamide With trichlorophosphate in 1,2-dichloro-ethane T=20°C; Cooling with ice; 2: 3-hydroxy-5,6,7,8-tetrahydro-2-naphthoic acid in 1,2-dichloro-ethane T=20 - 95°C; 24.3333 h; 3: With water; sodium acetate in 1,2-dichloro-ethane T=90°C; 1 h;