The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Naphthyridine chemistry. V. One-step synthesis of 1,8-naphthyridines》. Authors are Paudler, William W.; Kress, Thomas J..The article about the compound:4-Methyl-1,8-naphthyridinecas:1569-17-1,SMILESS:CC1=C2C=CC=NC2=NC=C1).SDS of cas: 1569-17-1. Through the article, more information about this compound (cas:1569-17-1) is conveyed.
cf. CA 66, 6881q; 65, 16955a; 64, 5057c. 2-Aminopyridine treated with Utermohlen’s “”sulfo-mix”” (CA 38, 9735) and glycerol gave 30% 1,8-naphthyridine. Similarly were prepared 2-methyl-, 4-methyl-, and 2,4-dimethyl-1,8-naphthyridines (I,II, and III). N.M.R. spectra data are given for the compounds
When you point to this article, it is believed that you are also very interested in this compound(1569-17-1)SDS of cas: 1569-17-1 and due to space limitations, I can only present the most important information.
Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem