Toluene → 4-chloro-N-methylbenzothiazolone

Beteiligte Stoffe

Reaktionsschritte

4-Chlorobenzothiazolone (9.28 g, 0.05 mole) was dissolved in a solution of sodium hydroxide (3.19 g, 0.075 mole) in water (220 ml), and tetra-n-butylammonium bromide (0.48 g, 0.0015 mole) and toluene (80 ml) were added thereto. Dimethyl sulfate (9.40 g, 0.075 mole) was added dropwise thereto at room temperature, and the mixture was stirred at room temperature for 1 hour, followed by phase-separation. The toluene layer was washed once with water, and the solvent was removed under reduced pressure to obtain 9.80 g of 4-chloro-N-methylbenzothiazolone as pale yellow crystals. Yield 98.2%, purity 98.2%, m.p. 130°-132° C.

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