• Article  

      The conversion of isothiazoles into pyrazoles using hydrazine 

      Ioannidou, Heraklidia A.; Koutentis, Panayiotis Andreas (2009)
      The conversion of isothiazoles into pyrazoles on treatment with hydrazine is investigated. The influence of various C-3, C-4 and C-5 isothiazole substituents and some limitations of this ring transformation are examined. ...
    • Article  

      The preparation of dicyano-1,3,4-thiadiazole and tricyanothiazole via 1,2,3-dithiazole chemistry 

      Christoforou, Irene C.; Kalogirou, Andreas S.; Koutentis, Panayiotis Andreas (2009)
      Treatment of 1,2-bis(4-chloro-5H-1,2,3-dithiazol-5-ylidene)hydrazine 4 with benzyltriethylammonium iodide (1 equiv) affords dicyano-1,3,4-thiadiazole 3 and 5-cyano-1,3,4-thiadiazole-2-carboxamide 5 in 79 and 21% yields, ...
    • Article  

      Synthesis of [(4-Chloro-5H-1,2,3-dithiazol-5-ylidene)amino]azines 

      Koutentis, Panayiotis Andreas; Koyioni, Maria G.; Michaelidou, Sophia S. (2011)
      The reactions of 2-, 3- and 4-aminopyridines with 4,5-dichloro-1,2,3- dithiazolium chloride (Appel salt) 4 to give N-(4-chloro-5H-1,2,3-dithiazol-5- ylidene)pyridin-Xamines 1a (X = 2), 1g (X = 3) and 1k (X = 4) were optimized ...