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Paper | Regular issue | Vol 26, No. 8, 1987, pp.2117-2124
Published online, 1st January, 1970
DOI: 10.3987/R-1987-08-2117
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


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.