Novel Calix[4]arene Dibenzocrown Ethers Bearing Lipophilic Alkyl Groups Symmetrically Branched

Abstract
1,3-dialkyloxycalix[4]arene dibenzocrown ether in which two lipophilic butyl groups are symmetrically attached were successfully synthesized in the fixed 1,3-alternate conformation (12 and 13) of which structure was characterized by X-ray crystal structure.