Process for the preparation of the compounds of the formulae Ia and Ib ##STR1## wherein A. 2,4,4-trimethylcyclohex-2-en-1-one oxime of the formula IIb ##STR2## is treated with a strong aqueous acid at from 30.degree. to 80.degree. C., preferably from 40.degree. to 70.degree. C., B. the resulting ketone of the formula IIIb ##STR3## 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 ##STR4## where R is one of the following radicals: --CH(OH)--CH.sub.2 --CH.dbd.CH.sub.2 (IIIb), --CH(OH)--CH.sub.3 (IIIc), --CH.sub.2 OH (IIId), --CH(OH)--CH.dbd.CH.sub.2 (IIIe), --CH(OCOCH.sub.3)--CH.sub.3 (IIIf), --CH.sub.2 --OCOCH.sub.3 (IIIg), --CO--CH.sub.2 --CH.dbd.CH.sub.2 (Ib), --CO--CH.sub.3 (Ic), and --CO--CH.dbd.CH.sub.2 (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.
制备公式Ia和Ib化合物的过程如下:
其中,A.将式IIb的2,4,4-三甲基环己-2-烯-1-酮
肟在30℃至80℃的强酸
水溶液中处理,优选在40℃至70℃之间进行;B.将得到的式IIIb的
酮类以常规方式氧化;C.如有必要,将得到的化合物Ib以常规方式异构化。
公式A的化合物中,R是以下基团之一:--CH(OH)-
CH2-CH= (IIIb),--CH(OH)-
CH3(IIIc),-- OH(IIId),--CH(OH)-CH= (IIIe),--CH(OCO )- (IIIf),-- -OCO (IIIg),--CO- -CH= (Ib),--CO- (Ic)和--CO-CH= (Ie)。
化合物IIIb至IIIg、Ib、Ic和Ie是有用的香味和芳香剂,并且可能成为新型类
胡萝卜素的重要中间体。它们可以从非常容易获得的化合物相对简单地制备。