反应详情

温度

75 °C

400 g of methyl methacrylate (4 mole), 200 g of cyclohexanol (2 mole) and 0.30 g of N,N'-diphenylbenzidine (500 ppm) are added to a 1 liter round-bottomed flask. Azeotropic dehydration is accomplished by conducting air through the resulting mixture, by way of a 1 m vigreux column. After cooling of the contents of the flask to about 75° C., 3 g of potassium cyanide (0.5%) are added, and the methyl methacrylate/methanol-azeotrope is distilled-off at a temperature of 65° C. at the head of the column. The trans-esterification is completed after 3.5 hours. After cooling of the flask, the sump is filtered to remove the potassium cyanide, and the filter residue is washed with a little methyl methacrylate. The filtrate is concentrated at 40° C. under a water jet vacuum. A residue of cyclohexyl methacrylate of 310 g = 85% will result.

1. customis distilled-off at a temperature of 65° C. at the head of the column
2. temperatureAfter cooling of the flask
3. filtrationthe sump is filtered
4. customto remove the potassium cyanide
5. washthe filter residue is washed with a little methyl methacrylate
6. concentrationThe filtrate is concentrated at 40° C. under a water jet vacuum