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Three methods for the preparation of N ‐substituted 2 H ‐3,1‐benzoxazine‐2,4(1 H )diones (isatoic anhydrides) (1) utilizing 2‐chloro‐, 2‐nitrobenzoic acids and N ‐unsubstituted isatoic anhydrides as starting materials, are described.
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HARDTMANN et al. (1975) studied this question.
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