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Bernthsen acridine synthesis

Lianyungang Klinechem Co.,Ltd | Updated: Nov 30, 2018

The Bernthsen acridine synthesis is the chemical reaction of a diarylamine heated with a carboxylic acid (or acid anhydride) and zinc chloride to form a 9-substituted acridine.[1][2]

The Bernthsen acridine synthesis

Using zinc chloride, one must heat the reaction to 200-270 °C for 24hrs.[3] The use of polyphosphoric acid will give acridine products at a lower temperature, but also with decreased yields.


  1. ^ Bernthsen, A.; Ann. 1878192, 1.

  2. ^ Bernthsen, A.; Ann. 1884224, 1.

  3. ^ Popp, F. D. J. Org. Chem. 196227, 2658. (doi:10.1021/jo01054a518)

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