Synthesis of sulfonylmethylated and cyanomethylated nitrobenzocrown ethers. Potential reagents for colourimetric analysis of alkali cations

Article abstract of DOI:10.1055/s-1994-25702

Sulfonylmethyl and cyanomethyl derivatives of nitrobenzocrown ethers were prepared via vicarious nucleophilic substitution of hydrogen. These compounds form highly coloured internal potassium salts soluble in nonpolar solvents.