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    • 10. 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。