Pyridazinone manufacture

C - Chemistry – Metallurgy – 07 – D

Patent

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260/264.7

C07D 237/24 (2006.01)

Patent

CA 1316536

PS 34905 ABSTRACT PYRIDAZINONE MANUFACTURE Improved method for the manufacture of plant regulant pyridazine-4-one carboxylic acids, which comprises the step of diazo-coupling a benzenediazonium salt with a dialkyl 3-oxoglutarate in the presence of water and a dispersing agent, preferably at a temperature not greater than 5°C.

611064

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