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°C to 200°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.
在从二醛(s)(I)和二元醇(s)(II)生产二醛单
缩醛(s)(III)的方法中,本发明提供了一种方法,该方法包括第一步,其中所述二醛(s)(I)和所述二元醇(s)(II)反应生成二醛双
缩醛(s)(IV)、所述二元醇(II)的摩尔量至少是所述二醛(I)摩尔量的两倍;第二步,所述二醛双
缩醛(IV)与所述二醛(I)反应。本发明还提供了一种通过 2-Y-3,4-二氢-
2H-吡喃或其环代衍
生物与二元醇反应生产
戊二醛单
缩醛的方法。该方法包括第二步反应,其中第一步反应的副产物之一
戊二醛 (iv) 与所述第一步反应的另一种副产物
戊二醛双
缩醛 (v) 反应。根据本发明,在上述生产
戊二醛单
缩醛(iii)的方法中,第一步反应结束后,在 100°C 至 200°C 的温度下加热粗反应溶液,从副产物中生产
戊二醛单
缩醛(iii),通过蒸馏除去由取代基 Y 产生的低沸点成分。