Spontaneous Resolution of Chiral 3-(2,3-Dimethylphenoxy)propane-1,2-diol under the Circumstances of an Unusual Diversity of Racemic Crystalline Modifications
作者:Alexander A. Bredikhin、Dmitry V. Zakharychev、Zemfira A. Bredikhina、Alexey V. Kurenkov、Dmitry B. Krivolapov、Aidar T. Gubaidullin
DOI:10.1021/acs.cgd.7b00510
日期:2017.8.2
crystallization from solutions, racemic 3-(2,3-dimethylphenoxy)propane-1,2-diol 1 forms three relatively stable crystalline modifications. Each of the crystalline forms, namely, two polymorphic racemic compounds and a racemic conglomerate, has been characterized by single-crystal X-ray diffraction. Two more metastable racemic compounds crystallized from the racemic melt have been found by differential
取决于从溶液中结晶的条件,外消旋的3-(2,3-二甲基苯氧基)丙烷-1,2-二醇1形成三个相对稳定的结晶变体。每种结晶形式,即两种多晶型外消旋化合物和外消旋团聚体,都已通过单晶X射线衍射进行了表征。通过差示扫描量热法发现了另外两种从外消旋熔体中结晶出来的亚稳态外消旋化合物。进行额外的热化学研究,可以绘制发现的所有相的自由吉布斯能量对温度的依赖性。借助于制浆实验,已经确定了固相之间过渡的性质。已经发现,在几乎外消旋的情况下,即使其中一种对映异构体也占很小的优势。1个样品可确保团块的结晶。在通过夹带程序实现rac - 1拆分为单个对映异构体的过程中,已考虑到rac - 1结晶的显露特征。