| 摘要 |
Process for the preparation of the compounds of the formulae Ia and Ib <IMAGE> wherein A. 2,4,4-trimethylcyclohex-2-en-1-one oxime of the formula IIb <IMAGE> (IIb) is treated with a strong aqueous acid at from 30 DEG to 80 DEG C., preferably 40 DEG to 70 DEG C., B. the resulting ketone of the formula IIIb <IMAGE> (IIIb) is oxidized in a conventional manner, and C. if desired, the resulting compound Ib is isomerized in a conventional manner. Compounds of the formula A <IMAGE> (A) where R is one of the following radicals: -CH(OH)-CH2-CH=CH2 (IIIb), -CH(OH)-CH3 (IIIc), -CH2OH (IIId), -CH(OH)-CH=CH2 (IIIe), -CH(OCOCH3)-CH3 (IIIf), -CH2-OCOCH3 (IIIg), -CO-CH2-CH=CH2 (Ib), -CO-CH3 (Ic) and -CO-CH=CH2 (Ie). The compounds IIIb to IIIg, Ib, Ic and Ie are useful scents and aromas, and furthermore may become important intermediates for novel carotenoids. They can be prepared in a relatively simple manner from compounds which are very readily available. |
