Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Zhurnal Prikladnoi Khimii (Sankt-Peterburg, Russian Federation) called Separation of quinaldine from a ternary mixture with quinoline and isoquinoline, Author is Belavina, I. G.; Potashnikov, M. M., which mentions a compound: 530-66-5, SMILESS is [O-]S(=O)(O)=O.C12=CC=C[NH+]=C1C=CC=C2, Molecular C9H9NO4S, Reference of quinoliniumhydrogensulphate.
The solubility relations of the monophosphate and bisulfate salts of quinaldine (I), quinoline (II), and isoquinoline (III) were studied. The solubility of the monophosphate of III in H2O at 25° is 6.7 times that of I or II. The solubility of the bisulfates of I and II was studied at 0-50° and 75-95% EtOH. At 10° and 85% EtOH, the solubility ratio of II to I is 3.8. I, 96% pure, was obtained from a mixture of I, II, and III by the following method. To 500 g. of a 1:1 mixture I (32%), II (20%), and III (40%) in MeOH was added 1 equivalent of H3PO4 (at <25°). To the precipitated salt was added just enough H2O to dissolve all of the phosphate of III. The remaining salt was decomposed in 20% NaOH yielding a 1:1 mixture of I and II. This was dissolved in 85% EtOH (1:1 ratio) and 1 equivalent of H2SO4 was added. The precipitated salt was recrystallized from 85% EtOH at 10°, decomposed with 10% base, extracted with benzene, and distilled to yield 58.8% I. I hope my short article helps more people learn about this compound(quinoliniumhydrogensulphate)Reference of quinoliniumhydrogensulphate. Apart from the compound(530-66-5), you can read my other articles to know other related compounds.
Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com