1: With hydrogenchloride; sodium nitrite in water; acetic acid T=0°C; 2: With sulfur dioxide; copper dichloride in water; acetic acid T=-20 - 20°C;

1: With n-butyllithium; Di-n-butylmagnesium in tetrahydrofuran T=-10°C; Inert atmosphere; 2: With sulfuryl dichloride in tetrahydrofuran; toluene T=-10 - 10°C;