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Potassium periodate

See also: sodium periodate

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The reaction of isothiocyanates with ortho-substituted anilines bearing N,N-, N,O-, and N,S-bis-nucleophiles, followed by an intramolecular, potassium periodate mediated oxidative cyclodesulfurization of the in situ generated monothioureas provides substituted 2-aminobenzazole derivatives in very good yields.
C. Duangkamol, W. Phakhodee, M. Pattarawarapan, Synthesis, 2020, 52, 1981-1990.