1: With borane-THF in tetrahydrofuran T=20°C; 18 h; 2: With hydrogenchloride in tetrahydrofuran; water pH=1; 4 h; 3: With sodium hydroxide in tetrahydrofuran; water pH=> 10;

water; triphenylphosphine in tetrahydrofuran T=20°C; 48 h; Product distribution / selectivity;