Dimethyl Sulfate → 2-{[4-(Dimethylamino)phenyl]diazenyl}-6-methoxy-3-methyl-1,3-benzothiazol-3-ium methyl sulfate

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Reaction Steps

A solution of [4-(6-methoxy-benzothiazol-2-ylazo)phenyl]-dimethyl-amine (Example 4b, 0.75 g, 2.40 mmol) and dimethyl sulfate (0.50 mL, 5.28 mmol) in 15 mL of chlorobenzene was heated under nitrogen at 70° C. for 3 hours. The solution was cooled and solid formed. The mixture was filtered, the solid was washed with diethyl ether and recrystallized from ethanol to give the title compound as a dark blue-black solid, mp 206-207° C., dec.

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