CROWN ETHER DERIVATIVES, PROCESS FOR THE PREPARATION OF COMPLEXING AGENTS BASED ON CROWN ETHER DERIVATIVES AND SELECTIVE MEMBRANE FOR SPECIFIC IONS CONTAINING SUCH DERIVATIVES.

摘要

Crown ether derivatives of the general formula I …CHEM… wherein… Z1 is a group of the general formula …CHEM… (in which Ra represents an alkyl group having 1-4 carbon atoms and Rb represents an alkyl group having 1-20 carbon atoms) are useful in the preparation of ion-selective electrodes having a long lifetime.