Effect of varying bases on preferential crystallization of <i>C</i>-methylresorcin[4]arene and calix[6]arene

<p>Preferential crystallization from a mixture of <i>C</i>-methylresorcin[4]arene (RsC1) and calix[6]arene (Calix6) in the presence of different bases has been investigated. In the presence of pyridine, a boat conformer of RsC1 crystallizes, whereas in the presence of triethylamine, Calix6 crystallizes in a symmetrically distorted conformation. The packing arrangements of the macrocycles show discrete solvent pockets for calixarenes and channels for resorcinarenes.</p>