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Synthesis of various heterocyclic compounds eliminating the existence of tautomerism and containing a closed thiocarbonyl group: a – sodium borohydride, methanol; b – aldehyde R 2 , isopropanol, hydrochloric acid; c –chloroacetic acid, isopropanol, ammonium acetate; d – ethanol, α-bromoketone, sodium acetate; e – carbonyldiimidazole, tetrahydrofuran.
