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    • 1. 发明授权
    • Preparation of benzaldehyde dialkyl acetals
    • 制备苯甲醛二烷基缩醛
    • US5507922A
    • 1996-04-16
    • US289277
    • 1994-08-11
    • Dieter HermelingHeinz HannebaumHartwig VossAndreas Weiper-Idelmann
    • Dieter HermelingHeinz HannebaumHartwig VossAndreas Weiper-Idelmann
    • C07C41/50C07C43/307C25B3/02
    • C25B3/02
    • Benzaldehyde dialkyl acetals of the general formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.6 -alkyl, R.sup.2 is C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -alkoxy, halogen, cyano or carboxyalkyl where the alkyl group is of 1 to 6 carbon atoms, n is an integer of from 1 to 3 and the radicals R.sup.2 may be identical or different when n is >1, are prepared by electrochemical oxidation of a substituted toluene compound of the general formula II ##STR2## by a process in which a substituted toluene compound II is oxidized in the presence of an alkanol R.sup.1 --OH and of an auxiliary electrolyte in an electrolysis cell, the reaction solution thus obtained is let down outside the electrolysis cell to a pressure which is from 10 mbar to 10 bar lower than the pressure in the electrolysis cell andA) in the batchwise procedure, the gas released from the reaction solution on letting down the latter is separated off and the reaction solution is recycled at least once to the electrolysis cell, subjected to electrolysis, let down, separated from the released gas and then worked up to obtain the product, orB) in the continuous procedure, some of the reaction solution is worked up to obtain the product and the remaining part of the reaction solution is mixed with an amount of the originally used reaction solution which corresponds to the part removed and is recycled to the electrolysis cell, subjected to electrolysis and let down.
    • 其中R 1是C 1 -C 6烷基,R 2是C 1 -C 6烷基,C 1 -C 6烷氧基,卤素,氰基或羧基烷基的苯甲醛二烷基缩醛,其中烷基是1至6碳 原子,n为1〜3的整数,并且当n> 1时,基团R2可以相同或不同,是通过以下方法制备的,通过以下方法制备通式II II的取代的甲苯化合物:其中 取代的甲苯化合物II在电解槽中在烷醇R1-OH和辅助电解质的存在下被氧化,将由此获得的反应溶液在电解槽内排出至10mbar至10bar以下的压力 比电解池中的压力和A)在分批程序中,将从反应溶液中释放的气体释放出来,将反应溶液再循环至少一次至电解槽,进行电解,放电 与...分开 释放气体,然后处理以获得产物,或B)在连续步骤中,处理一些反应溶液以获得产物,并将剩余部分的反应溶液与一定量的最初使用的反应溶液 其对应于去除的部分并且被再循环到电解槽中,进行电解和放电。
    • 2. 发明授权
    • Selective hydrolysis of acetals or ketals in the presence of phthalides
    • 在苯酞中存在下缩醛或缩酮的选择性水解
    • US06245945B1
    • 2001-06-12
    • US09623059
    • 2000-08-25
    • Andreas Weiper-IdelmannHeinz HannebaumHermann Pütter
    • Andreas Weiper-IdelmannHeinz HannebaumHermann Pütter
    • C07C4542
    • C07C45/515C07C45/59C07D307/88
    • A process for the selective hydrolysis of acetals in the presence of phthalides comprises reacting a mixture (M) comprising a) a phthalide of the formula (I) where: R1,R2,R3 and R4: are independently hydrogen, C1-C4-alkyl or halogen, and b) an acetal or ketal of the formula (II) where: R5 and R6: are independently C1-C6-alkyl, C6-C10-aryl or together ethylene, and R7 and R8: are independently C1-C6-alkyl, or one radical is a hydrogen and the other is a phenyl radical where from 1 to 3 hydrogen atoms of the phenyl radical may be replaced by C1-C6-alkyl radicals or C1-C4-alkoxy radicals, or R7 and R8 are together C3-C6-alkanediyl, and a hydrogen atom may be replaced by a hydroxyl group, at from 10 to 200° C. in the presence of from 1 to 10 mol of water, based on the amount of acetal or ketal of the formula (II), to hydrolyze the acetal or ketal of the formula (II) to the corresponding aldehyde or ketone.
    • 在含有苯并呋喃存在下选择性水解缩醛的方法包括使包含a)式(I)的苯酞的混合物(M)反应,其中:R1,R2,R3和R4独立地是氢,C1-C4-烷基或 卤素和b)式(II)的缩醛或缩酮,其中:R 5和R 6独立地为C 1 -C 6烷基,C 6 -C 10 - 芳基或一起为乙烯,R 7和R 8独立地为C 1 -C 6烷基,或 一个基团是氢,另一个是苯基,其中苯基的1至3个氢原子可以被C 1 -C 6 - 烷基或C 1 -C 4 - 烷氧基取代,或者R 7和R 8一起是C 3 -C 6 (II)的缩醛或缩酮的量,可以在10〜200℃的存在下,在1〜10摩尔的水的存在下,用羟基代替氢原子, 以将式(II)的缩醛或缩酮水解成相应的醛或酮。