Trimethyl orthoacetate → 4-Cyclohexylidene butanoic acid, methyl ester

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A distillation column-provided four-necked flask having a volume of one liter, which was equipped with a dropping funnel, a thermometer, a stirring device and a reflux ratio regulator, was charged with 250 g (1.922 moles) of 1-vinyl-1-cyclohexanol, 415.6 g (3.843 moles) of trimethyl orthoacetate and 1.4 g (0.019 moles) of propionic acid, and the internal temperature was raised to 115° C. Heating was continued for 12 hours while removing a fraction of not higher than 65° C. from a column top of the distillation column. After confirming the disappearance of 1-vinyl-1-cyclohexanol by a gas chromatographic analysis of the reaction solution, the reaction solution was distilled in vacuo. Fractions of from 120 to 130° C./1.2 kPa were collected to obtain 301.2 g (1.653 moles) of methyl 4-cyclohexylidenebutanoate. The yield was 86.0%.

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