Tridecalino-18-crown-6 being a new type of cylindrical crown ether has been synthesized and found to exhibit high complexing selectivity for K+/Na+ as well as high complexing ability for K+.
Didecalino- and decalino-cyclohexano-18-crown-6, being a new type of cylindrical macrocyclicpolyethers, have been synthesized and found to exhibit excellent complexing abilities toward potassium and sodium cations.