Nitric Acid → 2,2,6-Trimethylcyclohexanecarboxylic acid

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In a 300-ml 4-necked flask equipped with a condenser, a thermometer, a dropping funnel, and a stirrer was placed 39 g of nitric acid (aqueous 60% solution), and the temperature was raised to 55° C. Then, 93 g (0.60 mole) of 2,2,6-trimethylcyclohexanecarbaldehyde [composition: 90.2% of the trans-form, 9.8% of the cis-form] synthesized in Synthesis Example 6-A) was added dropwise thereto over a period of 2 hours. Thereafter, the reaction was carried out for 3 hours at the same temperature, and the reaction mixture obtained was washed with of 100 g of toluene and 100 g of water, followed by separating an organic layer from an aqueous layer. After further washing thrice the organic layer with 100 g of a saturated aqueous sodium chloride solution, the organic layer formed was separated from an aqueous layer. The toluene was distilled off from the organic layer by an evaporator under reduced pressure to provide 101 g of crude 2,2,6-trimethylcyclohexanecarboxylic acid (5) [composition: 90.5% of the trans-form, 9.5% of the cis-form].

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