3-Chlorobenzoic Acid → 3-Chlorobenzoic Acid

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A reactor is loaded with 151 g of 3-(2-cyclohexanonyl)propionitrile in 500 ml of n-hexane and 260 g of m-chloroperbenzoic acid (70% titer) dissolved at 50° C. in 2000 ml of n-hexane in 30 minutes. The solution is heated to 55° C. for 15 hours. Cooling separates from the solution, in crystalline form, part of the m-chlorobenzoic acid, which is scarcely soluble in the system, together with a heavy liquid phase which is formed by 7-cyanoethyl-2-oxepanone and by m-chlorobenzoic acid. 71.5 g of 7-cyanoethyl-2-oxepanone, impure with m-chlorobenzoic acid, are recovered from the lower phase. 24 g of 7-cyanoethyl-2-oxepanone are recovered from the upper phase by concentration and by several crystallizations. Conversion with respect to the initial ketone is 85%. Yield on the converted substance is 57%.

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