potassium tert-butylate in tetrahydrofuran T=25°C; 6 h;

potassium tert-butylate

1: With N-bromosuccinmide; triethylamine hydrofluoric acid in dichloromethane T=0 - 20°C; 2: With potassium tert-butylate in pentane 5 h; Heating;