作者:Krzysztof E. Krakowiak、Jerald S. Bradshaw、Chengyue Zhu、Jon K. Hathaway、N. Kent Dalley、Reed M. Izatt
DOI:10.1021/jo00094a015
日期:1994.7
New cryptaspherands 5-7 were prepared in 50-63% yields by treating 1 mol of the appropriate dioxa- or oxaalkanediamine with 2 mols of 2,6-bis[3-(bromomethyl)-2-methoxy-5-methylphenyl]-4-methylanisole in acetonitrile using Na2CO3 as the base. The affinities of these ligands for the alkali metal ions in a CHCl3-DMSO mixture were determined by a titration calorimetric procedure. The resulting log K, Delta H, and T Delta S values are compared to those for the interaction of two cryptahemispherands (3 and 4) prepared by the reported procedures. The more rigid cryptaspherands 5-7 were more selective for Cs+ over K+ or Na+ than the cryptahemispherands. The structure of new nitro-substituted cryptahemispherand 3 was determined by X-ray diffraction methods.