| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for easily producing sodium sulfinate and potassium sulfinate in a high yield and in a high purity, useful as intermediates for organic synthetic compounds and intermediates for photographic couplers, and to provide a method for easily producing photographic couplers in a high yield using the compounds. SOLUTION: This method for producing sodium sulfinate or potassium sulfinate is characterized by comprising using disodium hydrogenphosphate or dipotassium hydrogenphosphate, respectively.
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