Spotting a Conglomerate Is Just Halfway to Achieving a Preparative Resolution by Preferential Crystallization

Nowadays the detection of conglomerates has been improved; but with a view to implement an efficient preparative resolution by preferential crystallization, this is not enough. Indeed, when a conglomerate has been spotted, there is no other way to assess the feasibility of its preferential crystallization than to run various tests of entrainment. Three similar molecular structures in the series of 1,2-diaminocyclohexyl derivatives are presented in this work. The structures correspond to conglomerates with nonobvious stoichiometry. Two are successfully resolved by preferential crystallization; the third one cannot be resolved by entrainment.

如今，外消旋聚集体（conglomerate）的检测技术已得到显著提升；但若要通过优先结晶法（preferential crystallization）实现高效的制备型拆分，仅依靠该检测技术仍存在不足。事实上，在确认某体系为外消旋聚集体后，除开展各类夹带实验（entrainment tests）外，暂无其他方法可评估其优先结晶拆分的可行性。本研究选取了1,2-环己二胺衍生物系列中的三种结构相似的分子，这些分子均属于化学计量比不明显的外消旋聚集体体系。其中两种可通过优先结晶法成功实现拆分，第三种则无法通过夹带实验完成拆分。