[OH:1][CH:2]1[C:6]([CH3:7])=[C:5]([CH3:8])[C:4](=O)[O:3]1.S(Cl)([Cl:12])=O>>[Cl:12][CH:4]1[C:5]([CH3:8])=[C:6]([CH3:7])[C:2](=[O:1])[O:3]1A mixture of 6.6g of 2-hydroxy-3,4-dimethyl-5-oxo-2,5-dihydrofuran and 10 ml of thionyl chloride was stirred for 2 hours at room temperature. By concentrating the reaction mixture under reduced pressure, 7.5g of light-yellowish oily 2-chloro-3,4-dimethyl-5-oxo-2,5-dihydrofuran was obtained.
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