Novel palladium catalyzed dehydrogenation of α-hydrazinonitriles to hydrazonoyl cyanides using cyclopentene. Synthesis of 1H-pyrazole-4-carboxylate

Article abstract of DOI:10.1016/S0040-4039(96)02028-X

Palladium charcoal catalyzed dehydrogenation of α-hydrazinonitriles has been found to give hydrazonoyl cyanides in the presence of cyclopentene in high yields, which was applied to the synthesis of 1H-pyrazole-4-carboxylates.