potassium hydroxide in tetrahydrofuran; water Heating;

potassium carbonate in methanol T=20°C;

N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile in tetrachloromethane 2 h; Heating;

1: 2,2'-azo-bisisobutyronitrile; N-bromosuccinmide / tetrachloromethane / 4 h / |Reflux 2: copper dilithium tetrachloride / tetrahydrofuran; diethyl ether / 2 h / 0 - 20 °C 3: potassium carbonate / methanol / 20 °C View Scheme