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Baeyer–Emmerling indole synthesis : ウィキペディア英語版 | Baeyer–Emmerling indole synthesis
The Baeyer–Emmerling indole synthesis is a method for synthesizing indole from a (substituted) ''ortho''-nitrocinnamic acid and iron powder in strongly basic solution.〔(Baeyer 5 ). Pmf.ukim.edu.mk (1997-07-30). Retrieved on 2014-01-10.〕 This reaction was discovered by Adolf von Baeyer and A. Emmerling in 1869.
==Reaction mechanism== The reaction of iron powder with ''o''-nitrocinnamic acid reduces the nitro group to a nitroso. The nitrogen then condenses with a carbon on the alkene chain with loss of a molecule of water to form a ring. Decarboxylation gives indole.
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