| 摘要 |
PURPOSE:To obtain the titled compound which is a synthetic intermediate for carvomenthone or other perfume substances in high yield and improved and high selectivity, by thermally isomerizing limonene-1,2-epoxide in the presence of synthetic zeolite under reduced pressure using simple operations and appa ratuses. CONSTITUTION:Limonene-1,2-epoxide is heated at about 150-210 deg.C under about 3-15mmHg reduced pressure and brought into contact with synthetic zeolite, particularly preferably A, X, Y, L, mordenite, ZSM-5 or a mixture of two or more thereof to afford the aimed carvenone, i.e. 2-methyl-5-isopropyl-5- cyclohexen-1-one. EFFECT:The catalyst can be repeatedly used. |
