[C:1]([O:4][C:5]1[CH:9]([CH3:10])[S:8][CH2:7][C:6]=1[C:11]([O:13][CH3:14])=[O:12])(=[O:3])[CH3:2].S(Cl)(Cl)(=O)=O>C(Cl)Cl>[C:1]([O:4][C:5]1[C:6]([C:11]([O:13][CH3:14])=[O:12])=[CH:7][S:8][C:9]=1[CH3:10])(=[O:3])[CH3:2]To methyl 4-acetoxy-2,5-dihydro-5-methyl-3-thiophene-carboxylate (68.3 g) in anhydrous methylene chloride (143 ml) was added sulphuryl chloride (30.4 ml) dropwise over 30 minutes. The black solution was stirred at room temperature over night.
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