Preparation of carboxylic esters
    51.
    发明授权
    Preparation of carboxylic esters 失效
    羧酸酯的制备

    公开(公告)号:US5412120A

    公开(公告)日:1995-05-02

    申请号:US158361

    申请日:1993-11-29

    CPC分类号: C07C67/475 C07D309/08

    摘要: A process for preparing monocarboxylic esters of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.3 -C.sub.8 -cyclo-alkyl acyl, aryl or C.sub.7 -C.sub.20 -aralkyl or together --(CH.sub.2).sub.n --X--(CH.sub.2).sub.m --,X is methylene, oxygen, sulfur, NH or NR.sup.3,R.sup.3 is C.sub.1 -C.sub.12 -alkyl, andn and m are each from 0 to 8, comprises reacting geminal dicarboxylic esters of the general formula II ##STR2## where R.sup.1 to R.sup.3 are each as defined above, at from 150.degree. to 400.degree. C. in the presence of catalysts.

    摘要翻译: 一种制备通式I的单羧酸的方法,其中R 1和R 2各自为氢,C 1 -C 12 - 烷基,C 3 -C 8 - 环烷基酰基,芳基或C 7 -C 20 - 芳烷基或一起 - (CH 2 )nX-(CH 2)m - ,X是亚甲基,氧,硫,NH或NR 3,R 3是C 1 -C 12烷基,n和m各自为0至8,包括使通式II的偕二羧酸酯 其中R 1至R 3各自如上所定义,在150℃至400℃下,在催化剂存在下。

    Preparation of muscone, intermediates for this preparation and
preparation of said intermediates
    56.
    发明授权
    Preparation of muscone, intermediates for this preparation and preparation of said intermediates 失效
    麦芽糖的制备,本制剂的中间体和制备中间体

    公开(公告)号:US5081311A

    公开(公告)日:1992-01-14

    申请号:US524929

    申请日:1990-05-18

    摘要: Muscone of the formula I ##STR1## is prepared by a process in which an open-chain 2,15-diketone of the general formula IICH.sub.3 --CO--X--CO--CH.sub.3 (II)where X is one of the radicals--(--CH.sub.2 --).sub.12 -- (a)--CH.dbd.CH--(--CH.sub.2 --).sub.8 --CH.dbd.CH-- (b)--CH.sub.2 --CH.dbd.CH--(--CH.sub.2 --).sub.6 --CH.dbd.CH--CH.sub.2 --(c)--CH.sub.2 --CH.sub.2 --CH.dbd.CH--(--CH.sub.2 --).sub.4 --CH.dbd.CH--CH.sub.2 --CH.sub.2 -- (d) or--CH.sub.2 --CH.sub.2 CH.sub.2 --CH.dbd.CH--(--CH.sub.2 --).sub.2 --CH.dbd.CH--CH.sub.2 --CH.sub.2 --CH.sub.2 -- (e)is brought into contact, at from 300.degree. to 400.degree. C. in the presence of from 5 to 15% by weight, based on the amount of catalyst, of water, in the gas phase, with a fixed-bed catalyst containing TiO.sub.2, CeO.sub.2 or the ThO.sub.2 as the catalytically active compound and the unsaturated cyclic ketone formed by intramolecular aldol condensation is subjected to catalytic hydrogenation. Furthermore, the open-chain unsaturated ketones of the formulae IIb, IIc and IId and advantageous processes for their preparation and their use as intermediates for a simple industrial synthesis of muscone are claimed.

    摘要翻译: 通式Ⅰ(I)的肌醇通过以下方法制备,其中通式II CH3-CO-X-CO-CH3(Ⅱ)的开链2,15-二酮其中X是 基团 - ( - CH2-)12-(a)-CH = CH - ( - CH2-)8-CH = CH-(b)-CH2-CH = CH-( - CH2-)6-CH = CH-CH2 - (c)-CH 2 -CH 2 -CH = CH - ( - CH 2 - )4 -CH = CH-CH 2 -CH 2 - (d)或-CH 2 -CH 2 CH 2 -CH = CH - ( - CH 2 - )2 -CH = CH-CH 2 -CH 2 -CH 2 - (e)在300-400℃下,以5-15重量%的量存在下,基于催化剂的量,在气体中 使用含有TiO 2,CeO 2或ThO 2作为催化活性化合物的固定床催化剂和通过分子内醛醇缩合形成的不饱和环酮进行催化氢化。 此外,要求具有式IIb,IIc和IId的开链不饱和酮及其制备的有利方法及其作为简单的工业合成肌肉的中间体的用途。