Functionalized 13-crown-4, 14-crown-4, 15-crown-4, and 16-crown-4 compounds: synthesis and lithium ion complexation

Seven novel (benzyloxy)methyl-substituted crown ethers with four ring oxygens and 13-, 14-, 15-, and 16-membered polyether rings are synthesized and their lithium and sodium cation-binding abilities are assessed by solvent extraction of the aqueous alkali metal picrates. Strongest lithium ion complexation is observed with ((benzyloxy)methyl)-14-crown-4 compounds. 28 references, 1 figure, 2 tables.