“…About 30 years ago, in pioneering works, Shinkai and Taniguchi reported some examples of PTC that exploit the cation complexing abilities of calixarene‐ether derivatives (Figure b). Since then, however, this approach has been neglected . Surprisingly, even if calix[4]arene‐tetramides are better hosts for alkali metal cations with respect to calixarene‐ethers,, the PTC abilities of calix‐amide derivatives have been totally disregarded.…”