Barnes, J. published the artcileThe protonation state of one-electron reduced cytosine and adenine. 1. Initial protonation sites at low temperatures in glassy solids, Safety of N,N-Dimethylpyrimidin-4-amine, the publication is Journal of Physical Chemistry (1993), 97(13), 3401-8, database is CAplus.
ESR spectra of cytosine and adenine, one-electron reduced in a 9 M LiCl glass at 4° K, show that in each case protonation occurs at the amino group. In order to understand this, a number of one-electron-reduced cytosine and adenine analogs in different glassy environments were produced, at 4° K, and used Q-band EPR to determine the sites of protonation. That the specific association of Li+ with the ring nitrogen blocks protonation at the expected sites, N3 of cytosine and N1 of adenine, diverting protonation to the less basic amino group was concluded.
Journal of Physical Chemistry published new progress about 31401-45-3. 31401-45-3 belongs to pyrimidines, auxiliary class Pyrimidine,Amine, name is N,N-Dimethylpyrimidin-4-amine, and the molecular formula is C6H9N3, Safety of N,N-Dimethylpyrimidin-4-amine.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia