Abstract
SKUJINS1 proposed a colorimetric method of nitrate estimation using 7-hydroxy-4-methyl coumarin (I) as the reagent for nitration. The 3, 6 and 8 positions are activated for electrophilic substitution, but there is steric restriction to the entry of NO2+ to the 3 position.
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References
Skujins, J. J., Anal. Chem., 36, 240 (1964).
Shah, N. M., and Mehta, D. H., J. Ind. Chem. Soc., 31, 784 (1954).
Vogel, A. I., A Textbook of Practical Organic Chemistry, third ed., 854 (Longmans Green, London, 1956).
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LABY, R., MORTON, T. Estimation of Nitrate by Nitration of 7-Hydroxy-4,8-dimethyl Coumarin. Nature 210, 298–299 (1966). https://doi.org/10.1038/210298b0
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DOI: https://doi.org/10.1038/210298b0
