Synthesis and Alkali Metal Picrate Extraction Studies of an Unusual Cage-Functionalized Cryptand

摘要

Novel cage-functionalized cryptand (4) which contains two formalde-hyde acetal linkages was synthesized. The structure of 4 was estabilished unequivocally via application of X-Ray crystallographic techniques. Alkali metal picrate extractions were perfromed by using 4 as the host complexant, and the results thereby obtained were compared with the corresponding extraction efficiencies of two model crown ethers, i.e., (8 and 9) at the same concentration. Host system (4) proved to be considerably more efficient than either 8 or 9 as an alkali metal picrate extractant. In addition, 4 displayed moderatly high selectivity toward extraction of Li~+ and Na~+ picrates.