反应详情

300 g of 2,4-di-tert-butylphenol and 3.0 g of 5% palladium-carbon catalyst were introduced into a 500 ml autoclave and stirred therein at a reaction temperature of 180° C. under a hydrogen pressure of 20 kg/cm2. After approximately ten hours, the absorption of the theoretical amount (2.9 moles) of hydrogen was confirmed. Then the reaction mixture was cooled to room temperature and the catalyst was filtered off. 218 g of the crude 2,4-di-tert-butylcyclohexanone thus obtained was distilled under reduced pressure in a Helipack packing column of a number of theoretical plates of 5 to give 245 g of a colorless and transparent 2,4-di-tert-butylcyclohexanone (I) fraction (b.p.: 93° to 94° C./3 mm Hg). It was confirmed by gas chromatography that this product was a mixture of cisisomer (I-A) and trans-isomer (I-B) at a ratio of 83:17. The physical properties of this product were as follows:

1. customat a reaction temperature of 180° C.
2. waitAfter approximately ten hours
3. filtrationthe catalyst was filtered off