SELECTIVITY IN THE N- AND/OR C-ALKYLATION OF SCHIFF BASES CATALYZED BY CROWN ETHER
1981
The reaction of anions derived from Schiff bases (N-(α-methylbenzylidene)aniline and N-cyclohexylideneaniline) with ethyl iodide or diethyl sulfate in aprotic solvents, in the presence of 18-crown-6, is found to give a high ratio of N⁄(N+C) or C⁄(N+C) alkylation when conducted in benzene or in dioxane.
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