A novel process is described for preparing substituted pyridazines, where a less substituted pyridazine is reacted with a carboxylic acid in the presence of a silver ion as catalyst, using peroxydisulfate ion. The reaction is run at a temperature from about 40° to 80° C. in an aqueous solvent system and mineral acid. The substituted pyridazines are useful as intermediates to herbicidal and fungicidal compounds.
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(2008/06/13)
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