1: With tert.-butyl lithium in tetrahydrofuran T=-78°C; 1.5 h; 2: With copper (I) cyanide in tetrahydrofuran T=-78 - 20°C; 3: With 2,5-dimethyl-1,4-benzoquinone in tetrahydrofuran T=20°C; 3 h;

bromine; acetic acid in tetrachloromethane

1: bromine vapor / 16 h 2: bromine; acetic acid / CCl4 View Scheme

bromine 16 h;