Method of producing high yield alditol acetals with mineral acids and surfactants
申请人:——
公开号:US20020137953A1
公开(公告)日:2002-09-26
This invention relates to a process for preparing alditol acetals, such as dibenzylidene sorbitols, monobenzylidene sorbitols, and the like, through the reaction of unsubstituted or substituted benzaldehydes with alditols (such as sorbitol, xylitol, and ribitol) in the presence of a mineral acid and at least one surfactant having at least one pendant group of 6 carbon chains in length. Such a reaction provides a cost-effective, relatively safe procedure that provides excellent high yields of alditol acetal product. Furthermore, such a specific reaction is also the best known procedure for the production of certain compounds which can be easily separated from other formed isomers. Additionally, such a procedure facilitates the production of certain asymmetric alditol acetal compounds and compositions in acceptable yields as well. Such alditol acetals are useful as nucleating and clarifying agents for polyolefin formulations and articles, as one example.
本发明涉及一种制备醇醚醋酸酯(例如二苯基甘露醇、单苯基甘露醇等)的方法,通过在矿酸和至少具有至少一个6个碳链长度的挂链基团的表面活性剂存在下,使未取代或取代的苯甲醛与醇醇(例如山梨醇、木糖醇和核糖醇)反应。这种反应提供了一种成本效益高、相对安全的过程,可以提供优异的高产率的醇醚醋酸酯产品。此外,这种特定的反应也是已知的最佳生产某些化合物的方法,这些化合物可以轻松地与其他形成的异构体分离。此外,这种过程还可以以可接受的产率促进特定的不对称醇醚醋酸酯化合物和组合物的生产。这些醇醚醋酸酯可用作聚烯烃配方和制品的成核和澄清剂,作为一个例子。