o-Quinonoid compounds. Part III. Benzopyran-3-ones and their salts
- 1 January 1970
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society C: Organic
- No. 4,p. 536-540
- https://doi.org/10.1039/j39700000536
Abstract
In boiling acetic anhydride o-formylphenylacetic acid is partly dehydrated to benzopyran-3-one (λmax. 441 nm.), which forms appropriate adducts with dienophiles. In sulphuric acid o-formylphenylacetic acid is completely converted into the conjugate acid of benzopyran-3-one. Experiments leading to 1-methyl-benzopyran-3-one, the more stable 1-phenyl derivative, and their conjugate acids are described.Keywords
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