Abstract
Sodium perborate (SPB) was used as efficient green catalyst for NaNO2/KHSO4-mediated nitration of aromatic compounds in aqueous acetonitrile medium. Synthesis of nitroaromatic compounds was achieved under both conventional and solvent-free microwave conditions. Reaction times were comparatively shorter in the microwave-assisted than conventional reaction. The reaction kinetics for nitration of phenols in aqueous bisulfate and acetonitrile medium indicated first-order dependence on [Phenol], [NaNO2], and [SPB]. Reaction rates accelerated with introduction of electron-donating groups but retarded with electron-withdrawing groups. Kinetic results did not fit well quantitatively with Hammett’s equation. Observed deviations from linearity were addressed in terms of exalted Hammett’s constants (\( \bar{\sigma } \) or σeff), para resonance interaction energy (ΔΔGp) parameter, and Yukawa–Tsuno parameter (r). This term provides a measure of the extent of resonance stabilization for a reactive structure that builds up charge (positive) in its transition state. The observed negative entropy of activation (−ΔS#) suggests greater solvation and/or cyclic transition state before yielding products.
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Rajanna, K.C., Muppidi, S., Pasnoori, S. et al. Sodium perborate/NaNO2/KHSO4-triggered synthesis and kinetics of nitration of aromatic compounds. Res Chem Intermed 44, 6023–6038 (2018). https://doi.org/10.1007/s11164-018-3473-2
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DOI: https://doi.org/10.1007/s11164-018-3473-2