Long-chain alkyl cyclic acetals made from sugars are obtainable by a method that comprises the steps consisting of:
dehydrating a hexitol in a monoanhydrohexitol substrate;
reacting the monoanhydrohexitol substrate obtained with an alkyl aldehyde reagent containing 5 to 18 carbon atoms, by means of an acetalization reaction with a substrate/reagent ratio of between 5:1 and 1:1, or with a derivative of an alkyl aldehyde reagent containing 5 to 18 carbon atoms, by means of a transacetalization reaction with a substrate/reagent ratio of between 1:1 and 1:3, in the presence of acid catalyst and in an environment that is free of solvent or that consists of non-aqueous polar solvent;
collecting the long-chain alkyl acetal of hexitan from the mixture obtained.
这种方法包括以下步骤:将
己醇脱
水成为一种单醚
己醇底物;将得到的单醚
己醇底物与含有5至18个碳原子的烷基醛试剂反应,通过醚化反应,底物/试剂比在5:1至1:1之间,或者与含有5至18个碳原子的烷基醛试剂的衍
生物反应,通过醚化反应,底物/试剂比在1:1至1:3之间,在酸催化剂存在下,在无溶剂或非
水极性溶剂环境中进行;从得到的混合物中收集己糖的长链烷基醚。