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 COMPOUNDS, PROCESS FOR THE PREPARATION OF THE CROWN ETHER COMPLEX FORMING AGENTS AND ION-SELECTIVE MEMBRANE ELECTRODES CONTAINING THE SAME New crown ether derivatives of formula (I) < IMG > /I/ 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-, < IMG > or a group of the formula < IMG > (1) < IMG > (2) or < IMG > (3) suitable for forming cation complexes, process for the preparation thereof and alkali or alkali earth metal ion-selective membrane electrodes containing said compounds are described.