The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: quinoliniumhydrogensulphate( cas:530-66-5 ) is researched.Safety of quinoliniumhydrogensulphate.Popov, V. A.; Baboshin, Yu. V.; Belavina, I. G.; Cherkasov, N. Kh. published the article 《Conditions for extracting bases from the absorption fraction of coal tar》 about this compound( cas:530-66-5 ) in Uchenye Zapiski, Sverdlovskii Gosudarstvennyi Pedagogicheskii Institut. Keywords: extraction coal tar base; absorption oil extraction coal tar base; sulfuric acid tar base extraction; phosphoric acid tar base extraction. Let’s learn more about this compound (cas:530-66-5).
The extraction of heterocyclic nitrogenous bases from absorption oil fractions containing ∼9% bases, 10% naphthalene, and up to 10% phenols with 30% H2SO4 [7664-93-9] or 30% H3PO4 [7664-38-2] is described. H2SO4 has a higher extraction efficiency than H3PO4, but H3PO4 is less corrosive and has less tendency to gum formation. The removal of phenols during H2SO4 treatment is not so complete and this may double the amount of unextracted bases. The presence of phenols also increases the acid consumption. The solubility of the acid sulfate and monophosphate in the absorption oil fraction is ∼0.15% by volume at 20°. This value agrees with the residual after treatment with 80% excess H2SO4. Treatment with H3PO4 under similar conditions leads to a 10-fold increase in the residual unextracted bases.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com