Two structural types of 1,3-alternate tetrapropoxycalix[4]arene derivatives in the solid state

Org Biomol Chem. 2005 Jul 21;3(14):2572-8. doi: 10.1039/b505454k. Epub 2005 Jun 13.

Abstract

The solid state structures of seven tetrapropoxycalix[4]arene derivatives immobilised in a 1,3-alternate conformation were determined using single-crystal X-ray crystallography. The cavity shapes of investigated derivatives (upper rim unsubstituted, distally di-substituted and tetra-substituted) and the nature of intermolecular interactions in molecular packing were compared. The results indicate that there are only two structural types adopted by basic tetrapropoxycalix[4]arene derivatives in the 1,3-alternate conformation.