Novel 1,3-Alternate Calix[4]thiacrown Ethers

摘要

A series of novel 1,3-alternate calix[4]=mono-thiacrown and -bis-thiacrowns within good yields.The three dimensional 1,3-alternate conformation was confirmed by X-ray crystal structure. From the results of two phase extraction and NMR studies on the lignad -metal complex, one can conclude that the calix[4]thiacrown ethers showed the very high selectivity for silver ion over other metal by an electrostatic interaction between sulfur atom and silver ion and a ヰ-metla complexation