hydrogenchloride in water also for reaction catalysed with various bases; Rate constant;

1: With triphenylphosphine in toluene 0.0833333 h; 2: With diethylazodicarboxylate in toluene T=20°C; 18 h;

1.1: n-BuLi / tetrahydrofuran; hexane / 4 h / -78 °C 1.2: tetrahydrofuran; hexane / 11 h / -78 - 20 °C 2.1: 3.4 g / 2N HCl / tetrahydrofuran; hexane / 2 h / 20 °C 3.1: 88 percent / Et3N; NaI / acetonitrile / 4 h / 20 °C View Scheme

boron trifluoride diethyl etherate; sodium cyanoborohydride in tetrahydrofuran 3.5 h; Ambient temperature;

2,4,6-triphenylpyrilium perchlorate in acetonitrile 0.5 h; Irradiation;