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The pyrolysis of methyl isatins is described. Examination of the toluidines formed by elimination of 2 CO followed by H‐abstraction indicates that 1H‐benzazirines (12) are inter‐mediates. The interconversion of 1H‐ and 1aH‐benzazirine (15) is not detectable. 1‐Phenyl‐benzotriazole does not give a benzazirine intermediate.
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Curt Wentrup (1972) studied this question.
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