[C:1]1([S:7][CH2:8][C:9]([O:11][CH2:12][CH3:13])=[O:10])C=C[CH:4]=[CH:3][CH:2]=1.C(S)CCC.CC[O-].[Na+].BrCC(OCC)=O>C(O)C>[CH2:1]([S:7][CH2:8][C:9]([O:11][CH2:12][CH3:13])=[O:10])[CH2:2][CH2:3][CH3:4]The procedure is as in Example 2 for the preparation of ethyl (phenylthio)acetate, starting with n-butylmercaptan (10.7 cc), a 2M ethanolic solution of sodium ethylate (50 cc) and ethyl bromoacetate (16.7 g) in ethanol (100 cc). Ethyl (n-butylthio)acetate (15.4 g) is thereby obtained, and is used in the crude state in the subsequent syntheses.
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