Heterogeneous AgPd Alloy Nanocatalyst for Selective Reduction of Aromatic Nitro Compounds Using Formic Acid as Hydrogen
- PDF / 1,155,932 Bytes
- 5 Pages / 595.276 x 790.866 pts Page_size
- 15 Downloads / 209 Views
Heterogeneous AgPd Alloy Nanocatalyst for Selective Reduction of Aromatic Nitro Compounds Using Formic Acid as Hydrogen Source Vikram Babel1 · B. L. Hiran1 Received: 13 July 2019 / Accepted: 4 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A Heterogeneous catalyst developed for selective reduction of nitroarenes to the analogous anilines using formic acid as hydrogen source. This catalytic procedure offers a simplistic path to prepare aromatic amines in good to excellent yields. Especially, even anilines functionalized with other potentially reducible moieties are obtained with high selectivity. Herein, we report convenient and stable bimetallic AgPd nanocatalyst supported on metal organic framework coated with polyaniline. Hydrogenation of nitroarenes gave analogues anilines with excellent yields at 90 °C in 6 h with no use of additives. Catalyst maintained stable performance in five repeated cycles. Graphic Abstract
Keywords Metal organic framework · Polyaniline · Heterogenous catalysis · Chemoselective reduction · Hydrogenation
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03098-y) contains supplementary material, which is available to authorized users. * Vikram Babel [email protected] 1
Department of Chemistry, Mohanlal Sukhadia Univerisity, Udaipur, Rajasthan 313001, India
1 Introduction Aromatic primary amines (Ar-NH2) are important feed stocks and essential ingredients for the synthesis of several pharmaceutical, agrochemicals, dye, polymer, pigments, fine chemicals and natural products [1–3]. The method generally used for the production of Ar-NH2 is hydrogenation of functionalised aromatic nitro compounds using a stoichiometric
13
Vol.:(0123456789)
amount of reducing agents in presence of metal catalyst based on gold, palladium, rhodium, ruthenium, and iridium [4–6]. However, a disadvantage of commercially offered Pd catalysts is their lack of chemo-selectivity. These catalytic systems are unfortunately related with environmental issues or formation of enormous undesired by-products. Supplementary alteration of noble metals with suitable additives was essential to improve the selectivity, but not at cost of activity. While, the existence of other reducible functional groups in the nitroarenes creates the dual necessities of activity and selective reduction of nitro group pretty challenging. Leaching of metal from catalyst is also a major issue. The degree of leaching is strongly sensitive to the nanoparticle size, support material and most importantly reaction media and conditions. Although amazing improvements have been achieved but still the development of novel catalysts with broad functional group tolerance and high activity signifies an important challenge. Recently, metal organic frameworks (MOFs) have established as a promising class of porous materials with very large precise surface area, high porosity, and chemical tunability [7]. Because of these advantages and facile
Data Loading...
