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    • 34. 发明授权
    • Intermediates for the preparation of vitamin A and carotenoids and
process for their preparation
    • 用于制备维生素A和类胡萝卜素的中间体及其制备方法
    • US5563297A
    • 1996-10-08
    • US320150
    • 1994-10-07
    • Hugues Bienayme
    • Hugues Bienayme
    • B01J31/24C07B61/00C07C45/54C07C45/65C07C45/67C07C47/20C07C47/21C07C47/228C07C47/232C07C49/203C07C49/213C07C49/217C07C49/683C07C49/796C07C69/96C07C403/00C07C403/14
    • C07C403/14C07C403/02C07C403/12C07C45/54C07C45/67C07C47/20C07C47/21C07C47/232C07C49/217C07C49/683C07C49/796C07C69/96C07B2200/09C07C2101/16
    • The present invention relates to novel intermediates for the preparation of vitamin A and carotenoids, corresponding to the following formula (I): ##STR1## in which X is a carbon atom; n is equal to 1 or 2; R.sub.1, R.sub.2 and R.sub.3, which may be identical or different, each independently represent hydrogen, alkyl containing 1 to 4 carbon atoms, alkenyl containing 2 to 11 carbon atoms or aryl, each alkyl and alkenyl may be linear, branched or cyclic, or R.sub.1 and R.sub.2 can together with the carbon atom to which they are attached form a cycloaliphatic compound which is optionally substituted; and R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be identical or different, each independently represent hydrogen, alkyl containing 1 to 4 carbon atoms or alkenyl containing 2 to 10 carbon atoms, each alkyl or alkenyl being linear, or if containing sufficient numbers of carbon atoms, may also be branched or cyclic, or an aryl containing 6 to 10 carbon atoms, or any two of R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 may together form, along with the carbon atom(s) to which they are attached, a cycloalkylidene group containing 3 to 10 carbon atoms, as well as the process for their preparation and their use.
    • 本发明涉及用于制备维生素A和类胡萝卜素的新型中间体,其对应于下式(I):其中X为碳原子的式(I) n等于1或2; R 1,R 2和R 3可以相同或不同,各自独立地表示氢,含有1至4个碳原子的烷基,含有2至11个碳原子的烯基或芳基,每个烷基和烯基可以是直链,支链或环状的,或者R1 并且R 2可以与它们所连接的碳原子一起形成任选被取代的脂环族化合物; 和可以相同或不同的R 4,R 5,R 6,R 7和R 8各自独立地表示氢,含有1至4个碳原子的烷基或含2至10个碳原子的链烯基,每个烷基或烯基是直链的,或者如果含有足够的 碳原子数也可以是支链或环状的,或含有6至10个碳原子的芳基,或者R 4,R 5,R 6,R 7和R 8中的任何两个可以一起与它们的碳原子一起形成, ,含有3至10个碳原子的亚环烷基,以及其制备方法及其用途。