1.1
Reagents:
Butyllithium
Solvents:
Tetrahydrofuran
,
Hexane
;
-78 °C; 40 min, -78 °C
1.2
Reagents:
Sulfur dioxide
Solvents:
Tetrahydrofuran
;
15 min, -78 °C; 45 min, -78 °C → -5 °C
1.3
Reagents:
Sulfuryl chloride
;
30 min, rt

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