Abstract New pyrazole-containing aldehydes, 1-ethylpyrazole-4-carbaldehyde, 1-ethyl-3, 5- dimethylpyrazole-4-carbaldehyde, and 1, 1'-methylenebis (3, 5-dimethylpyrazole-4- carbaldehyde), were synthesized by the Vilsmeier reaction. Their reactions with primary amines (aniline, hydrazine, ethylenediamine, p-phenylenediamine, benzidine) gave the corresponding Schiff bases.
