Process for the synthesis of vitamin A and certain ones of derivatives
    43.
    发明授权
    Process for the synthesis of vitamin A and certain ones of derivatives 失效
    合成维生素A和某些衍生物的方法

    公开(公告)号:US5191110A

    公开(公告)日:1993-03-02

    申请号:US871710

    申请日:1992-04-21

    Abstract: According to this process, one effects a stereospecific reduction of the two hydroxyl groups of an ether-diol by a mixture (titanium trichloride, lithium aluminum hydride) at a temperature between 5.degree. C. and about 40.degree. C. and that optionally, one converts the resulting ether into vitamin A, retinol or retinoic acid.Application to the synthesis of all-trans compounds selected from the group consisting of vitamin A and its ethers, retinol and retinoic acid, and their 13-cis isomers.

    Abstract translation: 根据该方法,通过混合物(三氯化钛,氢化铝锂)在5℃至40℃之间的温度下,可以使醚 - 二醇的两个羟基的立体特异性还原,并且任选地,一个 将所得的醚转化为维生素A,视黄醇或视黄酸。 用于合成选自维生素A及其醚,视黄醇和视黄酸的全反式化合物及其13-顺式异构体的应用。

    Polyaminoamide which filters ultraviolet radiation
    49.
    发明授权
    Polyaminoamide which filters ultraviolet radiation 失效
    过滤紫外线辐射的聚氨基酰胺

    公开(公告)号:US5037901A

    公开(公告)日:1991-08-06

    申请号:US371751

    申请日:1989-06-27

    Abstract: Polyaminoamides of formula: ##STR1## in which A.sub.1 represents a divalent radical of structure: ##STR2## in which a and b=0 or 1 ##STR3## in which c and d=0 or 1 ##STR4## B.sub.1 represents: 1) in the proportions of 60 to 100% (in moles), the radical ##STR5## in which x.sub.2 =2 and n.sub.1 =1 or 2, or alternatively, x.sub.1 =3 and n.sub.1 =1 and e=0 or 12) in the proportions of 0 to 40% (in moles), the radical (II) above in which x.sub.1 =2 and n.sub.1 =0 or the radical ##STR6## 3) in the proportions of 0 to 20% (in moles), the radical--NH--(CH.sub.2).sub.6 --NH--;in radicals A.sub.1 and B.sub.1, Y represents a residue of an ultraviolet radiation-absorbing molecule, anda+b+c+d+e.gtoreq.1, it being understood that when a, b, c, d or e are zero, the nitrogen atom is then bound to a hydrogen atom;the ratio ##EQU1## is between 0.05 and 0.5; A.sub.2 represents a bivalent radical which has one of the following structures: ##STR7## B.sub.2 represents: 1) in the proportions of 60 to 100% (in moles), the radical ##STR8## in which x.sub.2 =2 and n.sub.2 =2 or 3, or alternatively, x.sub.2 =3 and n.sub.2 =22) in the proportions of 0 to 40% (in moles), the radical (III) above in which x.sub.2 =2 and n.sub.2 =1 or the radical ##STR9## 3) in the proportions of 0 to 20% (in moles), the radical--NH--(CH.sub.2).sub.6 --NH-- process for their preparation and their use as sunlight filters for hair and skin.

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