Kyu‐Sung Jeong, Jong Woo Park, Young Lag Cho
Apr 15, 1996
Citations
0
Influential Citations
27
Citations
Journal
Tetrahedron Letters
Abstract
Abstract A new dicarboxylic acid 4 was synthesized from 1,5-dichloroanthraquinone ( 1 ) and modified to ditopic receptors for binding of diammonium and dicarboxylate salts by multiple hydrogen bonds. The cis and trans isomers of 4 were assigned by the relative binding affinities of the bis(crown ether) derivatives, 5a and 5b to alkyl diammonium dipicrates. The association constants (K a ) between p -substituted bis-phenylureas and adipate vary from 5 × 10 2 to 2 × 10 4 M −1 in DMSO-d 6 , depending on substituents in the phenyl ring.