Reactivity of cis and trans Isomers of Dinitro- and Diamino-Substituted Dibenzo-18-Crown-6 in Metal Salt Sorption Processes

摘要

A promising way of increasing the efficiency of macrocyclic endoreceptors of the dibenzo- 18-crown 6 (DB18C6) class in metal salt extraction is introduction of additional substituents affecting the endoreceptor spatial structure into the benzene ring [1]. This approach was studied in relation to alkali metal extraction from nitric acid solutions with dialkyl derivatives of cis and trans DB18C6 [2]. The existing methods for the synthesis of these derivatives give isomer mixtures with unknown component ratio; therefore, the properties of single isomers cannot be estimated. Meanwhile, disubstituted acyl derivatives of DB18C6 were separated into 4,4'-cis and 4,5'-trans isomers [3].