G. Heinisch
Jul 1, 1973
Citations
0
Influential Citations
23
Citations
Journal
Monatshefte für Chemie / Chemical Monthly
Abstract
Pyridazine-4-carboxylic acid is prepared in high yield by catalytic hydrogenation of 3.6-dichloropyridazine-4-carboxylic acid.Claisen condensation of its ethyl ester with ethyl acetate yields ethyl 3-oxo-3-(4′-pyridazinyl)-propionate (6), the condensation reactions of which with urea, thiourea, phenylhydrazine and hydroxylamine are described. 4-Acetylpyridazine is prepared from6.