Process for the preparation of 2-chloro-4-methylphenol
AssigneeBayer Aktiengesellschaft
InventorsFranz-Josef Mais, Helmut Fiege
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Abstract
2-Chloro-4-methylphenol is prepared by reacting 4-methylphenol with a chlorinating agent in the presence of a catalyst system of one or more Lewis acids in a total amount of 0.1-10% by weight and one or more diaryl sulphides in a total amount of 0.1-10% by weight, all based on the amount of 4-methylphenol. The reaction temperature is 0.degree.-100.degree. C. The chlorinating agent is used in an amount of 0.5-1.5 mol per mole of 4-methylphenol. The reaction can be carried out until virtually complete consumption of the 4-methylphenol, high isomeric selectivity and high stage selectivity being observed.
Claims20
A process for the preparation of 2-chloro-4-methylphenol in yields of 90% or greater by reacting 4-methylphenol with a chlorinating agent in the presence of a Lewis acid, wherein the reaction is carried out at 0.degree.-100.degree. C. with 0.5-1.5 mol of chlorinating agent per mole of 4-methylphenol in the presence of a catalyst system of one or more Lewis acids in a total amount of 0.1-10% by weight and one or more diaryl sulphides in a total amount of 0.1-10% by weight, all based on the amount of 4-methylphenol.
Dependencies are inferred from the claim text.