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    • 4. 发明授权
    • 3-substituted 2-hydroxy-3-formylpropionic esters, the preparation
thereof and the use thereof for preparing 3-substituted 3-formylacrylic
esters
    • 3-取代的2-羟基-3-甲酰基丙酸酯,其制备及其用于制备3-取代的3-甲酰基丙烯酸酯的用途
    • US5256813A
    • 1993-10-26
    • US883342
    • 1992-05-15
    • Franz MergerJuergen Frank
    • Franz MergerJuergen Frank
    • C07C69/675C07C69/732
    • C07C69/675
    • A 3-substituted 2-hydroxy-3-formylpropionic ester of the formula I ##STR1## where R.sup.1 is lower alkyl, and R.sup.2 is straight-chain or branched alkyl of 1 to 10 carbon atoms, is obtained by adding an alkanal of the fomrula II ##STR2## and an alkyl glyoxylate of the formula III ##STR3## simultaneously to a catalyst system composed of a salt or a mixture of a secondary amine and a carboxylic acid in such a way that the temperature does not exceed 90.degree. C., preferably 80.degree. C., or else adding one of the reactants of the formula II or III to a mixture of the catalyst system described above and the other reactant in such a way that the temperature does not exceed 90.degree. C. The 2-hydroxy-3-formylpropionic eater of the formula I can be converted by treatment with dehydrating agents, especially acetic anhydride, into good yields of the corresponding 3-substituted 3-formylacrylic ester.
    • 其中R1是低级烷基,R2是具有1-10个碳原子的直链或支链烷基的式Ⅰ的3-取代的2-羟基-3-甲酰基丙酸酯是通过将烷基 的II型和式III(III)的烷基乙醛酸盐同时与由仲胺和羧酸的盐或混合物组成的催化剂体系,使得 温度不超过90℃,优选80℃,或者将一种式II或III的反应物加入到上述催化剂体系和另一种反应物的混合物中,使得温度不 超过90℃。式I的2-羟基-3-甲酰基丙酸酯可以通过用脱水剂,特别是乙酸酐处理转化成相应3-取代的3-甲酰基丙烯酸酯的良好产率。
    • 6. 发明授权
    • Preparation of cyclopentanones
    • 环戊酮的制备
    • US5166447A
    • 1992-11-24
    • US776688
    • 1991-10-15
    • Franz MergerTom Witzel
    • Franz MergerTom Witzel
    • C07C45/60C07C49/395C07C49/523
    • C07C49/395C07C45/60C07C49/523Y02P20/582
    • Cyclopentanones of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each an organic radical or R.sup.1 or R.sup.2 may be hydrogen and R.sup.3 is hydrogen or formyl, are prepared by a process in which a 2-formyl-3,4-dihydropyran of the general formula II ##STR2## where R.sup.1 and R.sup.2 have the abovementioned meanings, a) where R.sup.3 is formyl, is converted in the presence of an acidic heterogeneous catalyst at from 50.degree. to 500.degree. C., andb) where R.sup.3 is hydrogen,b.sub.1) is reacted with water or an alcohol in the presence of an acidic heterogeneous catalyst at from 100.degree. to 500.degree. C. in the gas phase orb.sub.2) a compound II or an acrolein of the general formula III ##STR3## is reacted with water or with water in the presence of an acid or with an alcohol in the presence of an acid at from 150.degree. to 400.degree. C. in the liquid phase. Novel 2-formylcyclopentanones are obtained.
    • 其中R 1和R 2各自为有机基团或R 1或R 2可以是氢并且R 3为氢或甲酰基的通式I(I)的环戊烷酮通过其中2-甲酰基-3,4 - 二氢吡喃,其中R 1和R 2具有上述含义,a)其中R 3是甲酰基,在酸性多相催化剂存在下在50-500℃下转化,和 b)其中R3是氢,b1)在酸性非均相催化剂存在下,在气相中在100-500℃下与水或醇反应,或b2)化合物II或通式为的丙烯醛 在酸的存在下,在酸的存在下,在液相中,在150℃至400℃的条件下,将III(III)化合物与水或水在酸或醇的存在下反应。 得到新的2-甲酰基环戊烷酮。
    • 7. 发明授权
    • Preparation of methacrylic acid
    • 甲基丙烯酸的制备
    • US5087744A
    • 1992-02-11
    • US213837
    • 1988-06-30
    • Richard KrabetzGerd DuembgenFranz MergerMichael JaegerFritz ThiessenHerbert Vogal
    • Richard KrabetzGerd DuembgenFranz MergerMichael JaegerFritz ThiessenHerbert Vogal
    • B01J27/19C07B63/04C07C51/00C07C51/235C07C51/25C07C57/055C07C57/07C07C67/00
    • C07C51/252
    • Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250.degree. to 400.degree. C. with cooling of the hot reaction gas to below 100.degree. C., absorption of the methacrylic acid in a water-operated absorption column, at below 100.degree. C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at
    • 甲基丙烯酸可以通过在250℃至400℃的含Mo和P的催化剂上甲基丙烯醛或异丁醛的气相氧化来制备,同时将热反应气体冷却至低于100℃,吸收甲基丙烯酸 酸在水性吸收塔中,低于100℃,并通过加入与反应中消耗的甲基丙烯醛或异丁醛的量相等的量的异丁烯醛或异丁醛,将甲基丙烯醛或异丁醛和氧气混合后,部分再循环进入氧化反应器 液体形式与聚合抑制剂一起在吸收塔的下三分之二的反应器气体中,在新鲜的甲基丙烯醛或异丁醛的进料点的上游或吸收塔的下游分离反应器废气a 侧流在洗涤塔中用水在<10℃下洗涤以除去未转化的异丁烯醛或异丁醛,其为f 作为吸收塔顶部的水溶液。