Calix [4] arenes carrying H, terr-butyl, and cyanomethyl groups in the p-positions are converted into tetraesters by aroylation or acylation in the presence of 1-methylimidazole or sodium hydride. Aroylation or acylation of p-cyanomethylcalix [4] arene in the presence of aluminum chloride yield the 1, 3-diesters which, upon further aroylation or acylation, provide a variety of tetraesters of mixed functionality.
![5,11,17,23-tetra-tert-butyl-25,26,27,28-tetra-(benzoyloxy)calix[4]arene Structure](https://image.chemsrc.com/caspic/429/113884-57-4.png)
![4-tert-butylcalix[4]arene tribenzoate Structure](https://image.chemsrc.com/caspic/194/135549-06-3.png)