[S:1]1[CH2:4][S:3][C:2]1=[C:5]([C:11]([O:13]CC)=[O:12])[C:6]([O:8][CH2:9][CH3:10])=[O:7].[OH-].[K+]>C(O)C>[S:1]1[CH2:4][S:3][C:2]1=[C:5]([C:11]([OH:13])=[O:12])[C:6]([O:8][CH2:9][CH3:10])=[O:7]Diethyl 2-(1,3-dithietan-2-ylidene)malonate was treated with a solution of potassium hydroxide in ethanol. The resultant solid was isolated and purified by the same method as in Example 1 to afford the titled compound as a white solid. (51%).
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