The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Differential thermal analysis (DTA) and thermogravimetric analysis (TGA) study of some organic acids. II》. Authors are Wendlandt, Wesley W.; Hoiberg, John A..The article about the compound:(1S,3R)-1,2,2-Trimethylcyclopentane-1,3-dicarboxylic acidcas:560-09-8,SMILESS:CC1(C)[C@@H](CC[C@]1(C)C(O)=O)C(O)=O).Quality Control of (1S,3R)-1,2,2-Trimethylcyclopentane-1,3-dicarboxylic acid. Through the article, more information about this compound (cas:560-09-8) is conveyed.
cf. CA 59, 8105f. The DTA and TGA curves of 5-aminosalicylic, 5-nitrosalicylic, acetylsalicylic, 5-bromosalicylic, salicylhydroxamic, α,β-dibromosuccinic, m-cresoxyacetic, p-bromomandelic, d-camphoric, diphenic, picric, 2,4-dimethoxybenzoic, m-hydroxybenzoic, 3,4-dihydroxybenzoic (1.5H2O), 4-hydroxy-3-methoxybenzoic, and tropic acids were obtained from ambient to 350°. The DTA curves are useful for identifying the acids.
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Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com