2,2-Dimethyl-5-phenyl-1,1,3,3-tetrafluororocyclohexane has been prepared and characterised as an example of a facially polarised cyclohexane containing 1,3 related CF2 groups. The dipolar nature of the ring arises from the axial orientation of two of the C–F bonds pointing in the same direction, and set by the chair conformation of the cyclohexane. This electrostatic profile is revealed experimentally both in the solid-state (X-ray) packing of the rings and by solution (NMR) in different solvents. A computationally derived electrostatic profile of this compound is consistent with a more electronegative and a more electropositive face of the cyclohexane ring. This placing of CF2 groups 1,3 to each other in a cyclohexane ring is introduced as a new design strategy which could be applicable to the preparation of polar hydrophobic cyclohexane motifs.
2,2-二甲基-5-苯基-1,1,3,3-四
氟环己烷已经制备并表征为一个具有面向极化的
环己烷的例子,其中包含1,3相关的CF
2基团。环的极性起源于两个C-F键的轴向取向指向同一方向,并由
环己烷的椅式构象确定。这种静电特性在固态(X射线)中环的堆积和在不同溶剂中的溶液(NMR)中实验上得以揭示。通过计算得出的这种化合物的静电特性与
环己烷环的更电负面和更电正面一致。将CF
2基团1,3相对放置在
环己烷环中,被引入作为一种新的设计策略,可适用于制备极性疏
水环己烷基团。