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Baeyer–Drewsen indigo synthesis

Organic reaction in which indigo is prepared from 2-nitrobenzaldehyde and acetone From Wikipedia, the free encyclopedia

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The Baeyer–Drewsen indigo synthesis (1882) is an organic reaction in which indigo is prepared from 2-nitrobenzaldehyde and acetone[1][2] The reaction was developed by von Baeyer and Viggo Drewsen in 1880 to produce the first synthetic indigo at laboratory scale. This procedure is not used at industrial scale.[3]

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Baeyer-Drewson indigo synthesis

The reaction is classified as an aldol condensation. As a practical route to indigo, this method was displaced by routes from aniline.[4]

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Mechanism

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Mechnaism of the Baeyer-Drewsen Indigo Synthesis

Note

In the English literature this reaction is sometimes called Baeyer–Drewson reaction, although the author of the original paper was spelled Drewsen.

References

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