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The Baeyer–Drewson indigo synthesis (1882) is an organic reaction in which indigo is prepared from 2-nitrobenzaldehyde and acetone
The reaction is classified as an aldol condensation. As a practical route to indigo, this method was displaced by routes from aniline.
Note
In the English literature this reaction is usually called Baeyer–Drewson reaction, although the author of the original paper was called Drewsen.
References
Baeyer–Drewson indigo synthesis Wikipedia(Text) CC BY-SA