1: 16 percent / acetic anhydride; ethyl cyanoacetate / 2 h / 100 °C 2: hydrazine View Scheme

dihydrogen peroxide in diethyl ether; acetic anhydride 168 h; Ambient temperature;

1: dicyclohexylcarbodiimide / acetonitrile / 24 h / Ambient temperature 2: 65 percent / hydrogen peroxide (40 percent) / acetic anhydride; diethyl ether / 168 h / Ambient temperature View Scheme

1: dicyclohexylcarbodiimide / acetonitrile / 24 h / Ambient temperature 2: 65 percent / hydrogen peroxide (40 percent) / acetic anhydride; diethyl ether / 168 h / Ambient temperature View Scheme