This paper recommends the use of dimethyl sulfone and 1,4-dinitrobenzene as internal standards for 1H NMR spectroscopy in concentrated sulfuric acid. These compounds were selected from 8 candidates tested for thermal stability and resistance to outgassing and H/D exchange. The effectiveness of the internal standards was demonstrated by measuring the rate constant of a model decarboxylation reaction.
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D. B. Ofosu, R. Z. Mendoza and P. J. Bracher, Analyst, 2025, 150, 3071 DOI: 10.1039/D5AN00161G
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