A compound erroneously described as 2,3-dihydro-3-hydroxybenzo[b]furan-2-one, the lactone of 2-hydroxymandelic acid, has been shown to be 2,3-dihydro-2-hydroxybenzo[b]furan-3-one, the cyclic hemiacetal of 2-hydroxyphenylglyoxal. Some of its reactions are discussed.
R. Howe, B. S. Rao and H. Heyneker, J. Chem. Soc. C, 1967, 2510 DOI: 10.1039/J39670002510
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