Structure and stereodynamics of all-cis tetramethylcalix[4]arenoctol and -dodecol ethers

Abstract
Conformations of all-cis-tetramethylcalix[4]arenoctol (1), all-cis-tetramethylcalix[4]arendodecol (2), all-cis-tetrabromo-tetramethyl-calix[4]arenoctol (3), and 10 different ethers of these compounds were studied by means of temperature dependent 1H-NMR spectroscopy and X-ray crystallographic analysis.