The para-nitro-product obtained from the nitration of NN-dimethylaniline with H15NO3 in 85–90% sulphuric acid shows strong polarisation of the 15N nuclei, probably as a result of catalysis of the reaction by nitrous acid.
J. H. Ridd and J. P. B. Sandall, J. Chem. Soc., Chem. Commun., 1981, 402 DOI: 10.1039/C39810000402
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