Journal
TETRAHEDRON LETTERS
Volume 44, Issue 42, Pages 7783-7787Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2003.08.080
Keywords
ionic liquids; zinc; reduction; nitroarenes; anilines; azo compounds; hydrazobenzenes
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Nitroarenes were chemoselectively reduced to the corresponding amines using zinc and aqueous ammonium salts in ionic liquids as a safe and recyclable reaction medium. Our results specify the effect of ammonium salts in the process; the combination of Zn/NH4Cl in [bmim][PF6] or Zn/HCO2NH4 in [bmim][BF4] were the suitable conditions for the reduction of nitroarenes. Azobenzenes were also smoothly reduced to hydrazobenzenes with Zn/HCO2NH4 (aq.) in recyclable [bmim][BF4] without any over reduction to the corresponding anilines. (C) 2003 Elsevier Ltd. All rights reserved.
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