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Co–Nx catalyst: an effective catalyst for the transformation of nitro compounds into azo compounds

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Abstract

The selective hydrogenation of nitro compounds into their corresponding azo compounds is challenging in organic synthesis. In this study, we have developed a facile and efficient catalytic system for the transformation of nitro compounds into azo compounds under mild conditions over a heterogeneous cobalt catalyst (Co–Nx/C-800-AT). The Co–Nx/C-800-AT catalyst was found to be highly active for the reductive-coupling of nitro compounds into azo compounds in ethanol at 110 °C and 2.5 bar H2 pressure with the addition of NaOH as an additive, affording structurally-diverse azo compounds with satisfactory yields (70.4–98.3%). The developed method demonstrated several advantages such as high catalytic activity and high selectivity with tolerance to other functional groups and high stability.

Graphical abstract: Co–Nx catalyst: an effective catalyst for the transformation of nitro compounds into azo compounds

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Article information


Submitted
29 May 2020
Accepted
11 Sep 2020
First published
12 Sep 2020

React. Chem. Eng., 2020, Advance Article
Article type
Paper

Co–Nx catalyst: an effective catalyst for the transformation of nitro compounds into azo compounds

R. Huang, Y. Wang, X. Liu, P. Zhou, S. Jin and Z. Zhang, React. Chem. Eng., 2020, Advance Article , DOI: 10.1039/D0RE00222D

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