Irradiation of 2-bromo-N-ethyl-4′-hydroxybenzanilide in aqueous alkali in the presence of sodium borohydride gave in high yield 2′-ethyl-4-hydroxyspiro[cyclohexa-2,5-diene-1,1′-isoindoline]-3′-one, which was oxidised to 2′-ethylspiro[cyclohexa-2,5-diene-1,1′-isoindoline]-3′,4-dione.
Z. Horii, C. Iwata, S. Wakawa and Y. Nakashita, J. Chem. Soc. D, 1970, 1039 DOI: 10.1039/C29700001039
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