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    • 66. 发明授权
    • Processes for producing dialdehyde monoacetals
    • 制备二醛单缩醛的方法
    • US6166225A
    • 2000-12-26
    • US403215
    • 1999-10-15
    • Yasutaka TanakaHiroaki UenakaiGiichi Shimada
    • Yasutaka TanakaHiroaki UenakaiGiichi Shimada
    • C07D317/26C07D321/00
    • C07D317/26
    • In a method of producing a dialdehyde monoacetal(s) (III) from dialdehyde(s) (I) and diol(s) (II), the present invention provides a method comprising a first step wherein said dialdehyde(s) (I) and said diol(s) (II) are reacted to produce dialdehyde bisacetal(s) (IV), the amount by mole of said diol(s) (II) being at least twice the amount by mole of said dialdehyde (I) and a second step wherein said dialdehyde bisacetal(s) (IV) is reacted with said dialdehyde (I). The present invention also provides a method of producing a glutaraldehyde monoacetal via reacting 2-Y-3, 4-dihydro-2H-pyran or a ring-substituted derivative thereof with diol. This method comprises a second step reaction wherein glutaraldehyde (iv) which is one of the by-products of the first step reaction is reacted with glutaraldehyde bisacetal (v) which is another by-product of said first reaction. According to the present invention, in the above-mentioned method of producing a glutaraldehyde monoacetal (iii), after the end of the first step reaction, the crude reaction solution is heated at a temperature of from 100.degree. C. to 200.degree. C. to produce the glutaraldehyde monoacetal (iii) from the by-products, low boiling-point components produced from the substituant group Y being removed via distillation.
    • PCT No.PCT / JP99 / 00692 Sec。 371 1999年10月15日第 102(e)日期1999年10月15日PCT提交1999年2月17日PCT公布。 出版物WO99 /​​ 41249 日期1999年8月19日在从二醛(I)和二醇(II)制备二醛单缩醛(III)的方法中,本发明提供了一种包括第一步骤的方法,其中所述二醛 s)(I)和所述二醇(II)反应生成二醛双缩醛(IV),所述二醇(II)的摩尔量为所述二醇(II)的摩尔量的至少两倍, 二醛(I)和第二步,其中所述二醛双缩醛(Ⅳ)与所述二醛(I)反应。 本发明还提供了通过使2-Y-3,4-二氢-2H-吡喃或其环取代的衍生物与二醇反应制备戊二醛单缩醛的方法。 该方法包括第二步反应,其中作为第一步反应的副产物之一的戊二醛(iv)与作为所述第一反应的另一副产物的戊二醛双缩醛(v)反应。 根据本发明,在上述戊二醛单缩醛(ⅲ)的制造方法中,在第一步反应结束后,将粗反应溶液在100℃〜200℃的温度下加热。 从副产物生产戊二醛单缩醛(ⅲ)时,通过蒸馏除去由取代基Y产生的低沸点成分。