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■ Reaction of Potassium Superoxide with 3-Nitro-2-phenyl-2H-1-benzopyrans and Their Dihydro Derivatives

Takkellapati Sudhakar Rao and Girish Kumar Trivedi

*Department of Chemistry, Indian Institute of Technology, Powai, Bombay 400 076, India

Abstract

3-Nitro-2-phenyl-2H-l-benzopyrans on treatment with potassium superoxide in dimethyl sulphoxide are degraded mainly to the corresponding salicylic acids and benzoic acids. Formation of flavonols, as a minor product are also observed. The dihydro derivatives of 3-nitro-2-phenyl-2H-1-benzopyrans are converted to the corresponding flavonols by potassium superoxide in benzene containing 18-crown-6 ether.