The N-1:N-3 protonation ratio in mono-protonated 2,4-diaminopyrimidine has been determined from 3JC-2,H-6 by using the N-1- and N-3-methylpyrimidinium iodides as model systems.
D. V. Griffiths and S. P. Swetnam, J. Chem. Soc., Chem. Commun., 1981, 1224 DOI: 10.1039/C39810001224
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