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    • 4. 发明授权
    • Preparation of .alpha.,.alpha.-dialkoxy ketones
    • (ALPHA),(ALPHA) - 二羟基酮的制备
    • US5159117A
    • 1992-10-27
    • US747575
    • 1991-08-20
    • Guenter WegnerStefan KarbachHubert SmudaEckhard HickmannReiner KoberRainer SeeleThomas Zierke
    • Guenter WegnerStefan KarbachHubert SmudaEckhard HickmannReiner KoberRainer SeeleThomas Zierke
    • C07C45/68C07C45/71C07C49/175C07C49/255C07C49/517C07C49/84C07D307/46C07D333/22
    • C07D333/22C07C45/68C07C45/71C07C49/175C07C49/255C07C49/517C07C49/84C07D307/46
    • A process for preparing .alpha.,.alpha.-dialkoxy ketones of the formula I ##STR1## where R.sup.1 and R.sup.2 are each, independently of one another, hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.3 -C.sub.20 -cycloalkyl, C.sub.4 -C.sub.30 -cycloalkylakyl, C.sub.9 -C.sub.30 -alkylcycloalkyl, unsubstituted or C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.8 -alkoxy-, halogen-, C.sub.1 -C.sub.4 -haloalkyl-, C.sub.1 -C.sub.4 -haloalkoxy-, phenyl-, phenoxy-, halophenyl-, halophenoxy- and/or cyano-substituted aryl, C.sub.7 -C.sub.20 -aralkyl or heterocyclyl,R.sup.2 is also ##STR2## R.sup.3 and R.sup.4 are each, independently of one another, C.sub.1 -C.sub.20 -alkyl, C.sub.3 -C.sub.20 -cycloalkyl, aryl, C.sub.7 -C.sub.20 -arylalkyl, or together are an unsubstituted or C.sub.1-C.sub.4 -alkyl- substituted C.sub.2 -C.sub.7 -alkylene chain andR.sup.5 is R.sup.1 or together with R.sup.1 is an unsubstituted or C.sub.1 -C.sub.4 -alkyl-substituted C.sub.2 -C.sub.7 -alkylene chain,which entails reacting ketones or aldehydes of the formula II ##STR3## with nitrites of the formula IIIR.sup.3/4 --(NO.sub.2).sub.n (III)where n is 1 or 2, and n is 2 when R.sup.3 and R.sup.4 together are an unsubstituted or C.sub.1 -C.sub.4 -alkyl-substituted C.sub.2 -C.sub.7 -alkylene chain, with the proviso that the nitrite radicals are located at the termini, or with a mixture of alcohol of the formula IVR.sup.3/4 --(OH).sub.n IVwhere n is 1 or 2, and n is 2 when R.sup.3 and R.sup.4 together are an unsubstituted or C.sub.1 -C.sub.4 -alkyl-substituted C.sub.2 -C.sub.7 -alkylene chain, with the proviso that the hydroxyl group is located at the terminus, and dinitrogen trioxide in a molar ratio of 2:1 in the presence of an acid catalyst at from 0.degree. to 170.degree. C.
    • 制备式I的α,α-二烷氧基酮的方法,其中R 1和R 2各自独立地为氢,C 1 -C 20 - 烷基,C 3 -C 20 - 环烷基,C 4 -C 30 - 环烷基,C 9 -C 30 - 烷基环烷基,未取代的或C 1 -C 8 - 烷基,C 1 -C 8 - 烷氧基 - ,卤素 - ,C 1 -C 4卤代烷基 - ,C 1 -C 4 - 卤代烷氧基 - ,苯基 - ,苯氧基 - ,卤代苯基 - ,卤代苯氧基 - 和/或氰基取代的芳基,C 7 -C 20 - 芳烷基或杂环基,R 2也是R 3和R 4彼此独立地为C 1 -C 20 - 烷基,C 3 -C 20 - 环烷基,芳基, 或者一起是未取代的或C 1 -C 4烷基取代的C 2 -C 7亚烷基链,R 5是R 1或与R 1一起是未取代的或C 1 -C 4烷基取代的C 2 -C 7亚烷基链,其中 需要使式II(II)的酮或醛与式III R3 / 4-(NO2)n(III)的亚硝酸盐反应,其中n为1或2,n为2,当R3和R4一起为 未取代的或C 1 -C 4烷基取代的C 2 -C 7 - 亚烷基链 条件是亚硝酸根自由基位于末端,或与式IV R3 / 4-(OH)n IV的醇的混合物,其中n为1或2,n为2,当R 3和R 4一起为未取代的或 C1-C4烷基取代的C2-C7-亚烷基链,条件是羟基位于末端,二氧化二氮在摩尔比为2:1的酸催化剂存在下,0℃至 170℃