Synthesis of two 1,3-2,4-calix[4]bis-crown ethers containing two 1,2- phenylene and one pyridine or anisole units in each crown ether moiety

Article abstract of DOI:10.1002/jhet.5570370101

Syntheses of 1,3-2,4-calix[4]bis-crown ethers (1 and 2) fixed in the 1,3-alternate conformation by 1,3- and 2,4-bridges made of two modified polyether chains each containing two 1,2-phenylene residues and one pyridine or anisyl unit are reported. The stru