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An environmentally benign procedure is developed for the preparation of 4-selanylpyrazoles from pyrazoles and diselenides. Using haloid salts as catalysts and H 2 O 2 as oxidant, this catalytic protocol is convenient in water at room temperature under open-air condition, and is suitable for a wide variety of starting materials and provides a series of 4-selanylpyrazoles in good yields. A plausible catalytic electrophilic substitution mechanism is hypothesized.

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