Dimethyl Sulfate → 1-Iodo-2-[(methylthio)methyl]-benzene

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To a mixture of 2-(2-iodo-benzyl)-isothiourea (13.53 g, 36.2 mmol) from previous step and a solution of NaOH (22 mL) in water (15 mL) was added dropwise dimethylsulfate (4.1 mL, 43.4 mmol). The reaction mixture was heated to reflux (105° C.) for 2 h, cooled. The resulting oil was then extracted into diethyl oxyde, the organic layer was washed with water, dried over Na2SO4. On concentration the solution generated a yellow oil that was directly used in the next step without any further purification (8.5 g, yield=89%).

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