NEW CROWN ETHER COMPOUNDS, PROCESS FOR THE PREPARATION OF THE CROWN ETHER COMPLEX FORMING AGENTS AND ION-SELECTIVE MEMBRANE ELECTRODES CONTAINING THE SAME

摘要

New crown ether derivatives of formula (I)$(6,)$wherein R stands for hydrogen or C1-4 alkyl, n stands for 1,2, X stands for oxygen, sulphur or a NH-group, Y represents hydrogen or nitro, Z represents a chemical bond, -CH2-, -(CH2)2-4-, -CH2OCH2-, -CH2SCH2-, -CH2-O-CH-CH-O-CH2- or a group of the formula $(10,)$suitable for forming cation complexes, process for the preparation thereof and alkali or alkali earth metal ion-selective membrane electrodes containing said compounds.