ammonia T=40°C; 336 h;

potassium hydroxide; tetra(n-butyl)ammonium hydrogensulfate in tetrahydrofuran T=20°C;

1: 80 percent / diethyl ether / 1 h / Ambient temperature 2: 88 percent / 25percent aq. sodium sulfite, 10percent aq. KOH / diethyl ether; CHCl3 / 1 h 3: 41 percent / tetrabutylammonium hydrogen sulfate, KOH / tetrahydrofuran / 8 h / Ambient temperature View Scheme

1: 88 percent / 25percent aq. sodium sulfite, 10percent aq. KOH / diethyl ether; CHCl3 / 1 h 2: 41 percent / tetrabutylammonium hydrogen sulfate, KOH / tetrahydrofuran / 8 h / Ambient temperature View Scheme