The reaction of 2-methylresorcinol with p-tolualdehyde afforded rctt and rccc diastereomers of calix[4]methylresorcinarene and an insignificant amount of the rcct isomer. The structure of the latter was established by X-ray diffraction analysis. The macrocycle in the rcct isomer adopts a 1,2-diplanar conformation, in which one pair of adjacent resorcinol fragments is nearly orthogonal to another pair of resorcinol fragments. The supramolecular organization of the diastereomer in the crystal was studied. The tolyl fragments form the outer surface of the layers composed of the macrocycles, which are separated by “interlayers” of solvent molecules. Cavitands adopting a cone conformation were prepared from the rctt and rccc diastereomers by linking the adjacent phenoxy groups through methylene bridges. The structure of the rctt cavitand was confirmed by 2D NMR spectroscopy.
                                    2- 甲基
间苯二酚与
对甲基苯甲醛反应后,得到了 calix[4]methylresorcinarene 的 rctt 和 rccc 非对映异构体,以及少量的 rcct 异构体。后者的结构是通过 X 射线衍射分析确定的。rcct 异构体中的大环采用 1,2 二平面构象,其中一对相邻的
间苯二酚片段与另一对
间苯二酚片段几乎正交。对晶体中非对映异构体的超分子结构进行了研究。
甲苯基片段构成了由大环组成的层的外表面,这些大环被溶剂分子的 "夹层 "隔开。通过将相邻的苯氧基通过亚甲基桥连接起来,从 rctt 和 rccc 非对映异构体中制备出了采用锥形构象的空穴体。二维核磁共振光谱证实了 rctt 空位体的结构。