Abstract
Ab initio (HF and MP2 level) and semiempirical (AM1, PM3, MNDO) calculations on the relative stabilities and structures of the potential tautomeric forms of rhodanine, isorhodanine, thiazolidine-2,4-dione, and thiorhodanine are reported. Ab initio calculations predict that the thiooxo, oxothio, dioxo, and dithio tautomers are the most stable. These results correspond to the known experimental data. Infrared spectra of the investigated compounds were recorded for the region 4000-150 cm-1, and the characteristic bands were compared with ab initio calculated frequencies at the HF/3-21G(*)* level.
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Enchev, V., Chorbadjiev, S. & Jordanov, B. Comparative Study of the Structure of Rhodanine, Isorhodanine, Thiazolidine-2,4-dione, and Thiorhodanine. Chemistry of Heterocyclic Compounds 38, 1110–1120 (2002). https://doi.org/10.1023/A:1021217617954
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DOI: https://doi.org/10.1023/A:1021217617954