1: acetoacetic acid benzyl ester With sodium nitrite in water; acetic acid T=20°C; 2: 3-(n-butyl)-2,4-pentanedione With sodium acetate; zinc in water; acetic acid T=80 - 90°C; Further stages.;

sodium T=80°C; P=15 Torr; 4 h;

in benzyl alcohol T=20 - 230°C; 1.58333 h;

1: 1.) zinc, sodium acetate / 1.) acetic acid, 80 deg C, 40 min; 2.) acetic acid, 20 min, 95-105 deg C 2: 67 percent / sodium / 4 h / 80 °C / 15 Torr View Scheme