In connection with recent studies of nitrogen heterocyclic amides' and hydrazides, new syntheses of pyridazine-3-carboxylic acid and pyridazine-4-carboxylic acid were developed. Gabriel and Colman2 first made pyridazine-3-carboxylic acid by the permanganate oxidation of 3-9-hydroxyphenylpyridazine. In the present work two alternate routes to the 3- acid were explored. Permanganate oxidation of 3-hydroxymethylpyridazine and reductive ...