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    • 89. 发明授权
    • Method for producing 3-methyl 2-butenal acetals
    • 3-甲基2-丁烯醛缩醛的制备方法
    • US06313322B1
    • 2001-11-06
    • US09463847
    • 2000-02-01
    • Gisela HieberKlaus Ebel
    • Gisela HieberKlaus Ebel
    • C07C43303
    • C07C41/56C07C43/303
    • A process for preparing acetals of the formula I where a) the Rs are, independently of one another, a C1-C20-alkyl or C3-C20-alkenyl radical, or b) the two R radicals together form the members of an unsubstituted or C1-C10-alkyl-substituted 5- to 7-membered cyclic acetal, by reacting 3-methyl-2-butenal in the presence of sulfamic acid, of a N-(C1-C8-alkyl)sulfamic acid or of a N,N-di(C1-C8-alkyl)sulfamic acid as catalyst with: an alcohol of the formula R—OH (IIa), or an orthoester of the formula HC—(OR)3 (III) or a mixture of an alcohol of the formula (IIa) and an orthoester of the formula (III), or an alcohol of the formula HO—(CH2)m—OH (IIb), where m is a number from 2 to 4, and (CH2)m group in the alcohol IIb may be substituted by a C1-C10-alkyl group.
    • 制备式I的缩醛的方法,其中R a彼此独立地为C 1 -C 20烷基或C 3 -C 20 - 烯基,orb),两个R基团一起形成未取代的或C 1 -C 10的成员 - 烷基取代的5-至7-元环状缩醛,在氨基磺酸存在下,使3-甲基-2-丁烯醛,N-(C 1 -C 8 - 烷基)氨基磺酸或N,N-二 (II)的醇或式(II)的醇的混合物或式(IIa)的醇的混合物, 和式(III)的原酸酯,式HO-(CH 2)m -OH(IIb)的醇,其中m为2至4的数,醇IIb中的(CH 2)m基团可以被取代 通过C 1 -C 10 - 烷基。