Facile Synthesis of Cone p-tert-Butylcalix[4]arene-crown Conformers.

The series of p - tert -butylcalix[4]arene-crowns in the cone conformation was synthesised in high yields under conditions producing disubstituted calix[4]arenes in the presence of K 2 CO 3 in acetonitrile; the formation of calix-bis(crown)s and doubly(calix)-doubly(crown) in these reactions was established.