Syntheses and Structures of New Pyridino-18-Crown-6 Ligands Containing TwoMethyl, Two t-Butyl or Two Allyl Substituents on Chiral Positions Next to the Pyridine Ring

摘要

Chiral 2,16-diallyl-, 2,16-dimethyl- and 2,16-di-t-butylpyridino-18-crown-6ligands have been prepared by treating the appropriate chiral a,a'-disubstituted pyridinedimethanol with tetraethyleneglycol ditosylate in the presence of base. In these reactions, chiral 2:2 dimers (dipyridino-36-crown-12 derivatives) were also obtained.