1: With methyl chloroformate; 1,1,1,3,3,3-hexamethyl-disilazane in tetrahydrofuran T=5°C; 3 h; 2: With sodium hydroxide in tetrahydrofuran T=10°C; 2 h; 3: With hydrogenchloride in tetrahydrofuran; water pH=7;

1: With 3-chloro-benzenecarboperoxoic acid in ethylene glycol dimethyl ether T=20°C; 1.5 h; 2: With potassium hydroxide in methanol; ethylene glycol dimethyl ether

1: With trichlorophosphate 8 h; Heating / reflux; 2: With sodium hydrogencarbonate in water T=0°C; pH=8 - 9;