Abstract
The nitration process using 95 % nitric acid instead of the classical nitric acid–sulfuric acid system appears to be attractive and promising in the preparation of nitro compounds. The ratio of 2-nitrobiphenyl (2a) isomer to 4-nitrobiphenyl (2b) can reach 0.69 in a good yield of 78.42 %. The isomeric distribution of the product mononitrobiphenyl was found to be superior to traditional methods. Raising the ratio of 95 % nitric acid and biphenyl to 4:1, the yield of dinitration products can reach more than 78.08 %, as a mixture of 2,2′-dinitrobiphenyl (3a), 2,4′-dinitrobiphenyl (3b), and 4,4′-dinitrobiphenyl (3c).
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Tai, Y., Peng, X., Shi, C. et al. Zeolite-assisted nitration of biphenyl using nitric acid. Res Chem Intermed 41, 867–872 (2015). https://doi.org/10.1007/s11164-013-1238-5
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DOI: https://doi.org/10.1007/s11164-013-1238-5