cis-5-hydroxy-2-methyl-1,3-dioxane (1) as the most volatile. When the distillation is carried out in the presence of an acid catalyst to promote interconversion, 1 is obtained as a nearly pure distillate stream. This is further adapted to a continuous reactive distillation which produced 90–96% 1. Thus a novel process is presented to convert glycerol to the desired acetal (1), which can be further converted to
四种环状
甘油缩醛异构体可以通过
甘油与
乙醛或相关
缩醛物质的酸催化反应而容易地制备。在
缩醛形成中使用的酸催化剂存在下,异构体相互转化形成平衡混合物,该混合物包含相似量的四种产物。真空蒸馏可以将四个
缩醛分离成它们的纯化形式,其中顺式-5-羟基-
2-甲基-1,3-二恶烷(1)最易挥发。当蒸馏是在酸催化剂的存在下进行,以促进相互转换,1作为一个几乎是纯的馏出物流得到。这进一步适合于连续反应蒸馏,产生90-96%1。因此,提出了将
甘油转化为所需
缩醛(1)的新方法,该
缩醛可以进一步转化为产物,例如1,3-
丙二醇和二
羟基丙酮。