Hydrochloric Acid → beta-Carbaryl

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반응 단계

A process for the manufacture of α-naphthyl-N-methylcarbamate by the reaction of methylcarbamyl chloride and α-naphthol containing β-naphthol as an impurity, which comprises reacting methylcarbamyl chloride, which is essentially free from phosgene and hydrogen chloride, in the absence of an acid-binding agent, with α-naphthol containing β-naphthol as an impurity at a temperature in the range of 60° to 130° C in, as solvent, cumene, the starting concentration of said naphthol in the cumene being in the range of 20 to 40% by weight, based on the cumene, and cooling the reaction mixture to precipitate the α-naphthyl-N-methylcarbamate as a pure crystalline solid, the β-naphthyl-N-methylcarbamate formed in the reaction remaining in solution in the cumene when the reaction mixture is cooled.

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