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. 2021 Mar 16;6(12):8346–8355. doi: 10.1021/acsomega.1c00061

Table 3. Screening of Oxidizing Agents for the Conversion of N-Alkylated Isatin to N-Alkylated Isatoic Anhydride for Scheme 3iii.

entry oxidizing agents catalyst T (°C) time (h) yield (%)
3A peracetic acid   30 24 70
3B performic acid   30 24 75
3C persulfuric acid   30 24 trace
4A hydrogen peroxide bismuth nitrate 60 48 nil
4B hydrogen peroxide mercuric chloride 60 48 nil