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Nierenstein reaction

The Nierenstein reaction is an organic reaction describing the conversion of an acid chloride into an haloketone with diazomethane.[1][2]


Reaction mechanism

Like the related Arndt-Eistert reaction, this reactions proceeds through a diazoketone intermediate (5). The loss of nitrogen to gives the desired haloketone (2).

The synthesis of benzyl chloromethyl ketone from phenylacetyl chloride [3] in fact requires the addition of HCl gas to the diazoketone intermediate for it to succeed. The unassisted reaction failed.


One original 1924 Nierenstein reaction:[4]

and a reaction starting from benzoyl bromide going haywire with formation of the dioxane dimer:[5]


  1. ^ Clibbens, D.; Nierenstein, M. J. Chem. Soc. 1915, 107, 1491.
  2. ^ Bachman, W. E.; Struve, W. S. Org. React. 1942, 1, 38. (Review)
  3. ^ McPhee, W. D; Klingsberg, E. Organic Syntheses, Coll. Vol. 3, p.119 (1955); Vol. 26, p.13 (1946). (Article)
  4. ^ THE ACTION OF DIAZOMETHANE ON SOME AROMATIC ACYL CHLORIDES II. SYNTHESIS OF FISETOL M. Nierenstein, D. G. Wang, and J. C. Warr J. Am. Chem. Soc.; 1924; 46(11) pp 2551 - 2555. (doi:10.1021/ja01676a028)
  5. ^ THE ACTION OF DIAZOMETHANE ON SOME AROMATIC ACYL CHLORIDES. III. THE MECHANISM OF THE REACTION H. H. Lewis, M. Nierenstein, and Enid M. Rich J. Am. Chem. Soc.; 1925; 47(6) pp 1728 - 1732. (doi:10.1021/ja01683a036)

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Nierenstein_reaction". A list of authors is available in Wikipedia.
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