Wittig reaction of isatin with ethyl bromoacetate
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reaction of isatin prepared by an acid catalyzed reaction of isatin and oxindole derivatives148,149 and from thereaction of N-methylisatoic anhydride or N-methylisatin with sodium phosphonates150,151. ... In a reverse sense, isatin has been identified as one of the products of the oxidation of indigo by nitric acid and light.
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