37844-24-9Relevant academic research and scientific papers
an interesting isomerization: synthesis of mesoionic 5-arylamino-1,3,4-thiadiazolium-2-thiolates by using ω-bromo-ω-(1H-1,2,4-triazol-1-yl)acetophenone as catalyst
Chu, Chang-Hu,Hui, Xin-Ping,Xu, Peng-Fei,Zhang, Zi-Yi,Li, Zhi-Chun,Liao, Ren-An
, p. 943 - 946 (2007/10/03)
Mesoionic 5-arylamino-1,3,4-thiadiazolium-2-thiolates 7a-f were prepared by the isomerization of 5-arylamino-1,3,4-thiadiazol-2-thiones 5a-f by using ω-bromo-ω-(1H-1,2,4-triazol-1-yl)acetophenone 6 as catalyst. All the structures of mesoionic synthesized were confirmed by elemental analyses, 1H NMR, IR and MS spectral data. We have also determined the x-ray photoelectron spectroscopy (XPS) of the mesoionic and their precursors. A comparison of XPS spectra between the mesoionic and their precursors showed that the charge separation in mesoionic is distinctly larger than in their precursors.
Alkali catalyzed thermal cyclization of 1-substituted and 1,6-disubstituted 2,5-dithiobiureas: Formation of 1,2,4-triazolidine-3,5-dithiones and/or 1,3,4-thiadiazoline-5-thiones
Raphael, Elsamma,Joshua, C. P.,Koshy, Lisamma
, p. 635 - 638 (2007/10/02)
Alkali catalyzed thermal cyclization of 1-alkyl and 1,6-dialkyl-2,5-dithiobiureas (I, R=alkyl, R'=H and R=R'=alkyl) results in the formation of 4-alkyl-1,2,4-triazolidine-3,5-dithiones (V) (alkyl=Me or Et) and 2-alkylamino-Δ2-1,3,4-thiadiazoline-5-thiones (VI) (alkyl=n-Pr or n-Bu).Under the same conditions, 1-alkyl-6-aryl-2,5-dithiobiureas (I, R=alkyl, R'=aryl) give 2-arylamino-Δ2-1,3,4-thiadiazoline-5-thiones (IX) (alkyl=Me, Et, n-Pr or n-Bu) and 4-alkyl-1,2,4-triazolidine-3,5-dithiones (V) also when the alkyl groups are Me or Et.
