Browsing Τμήμα Χημείας / Department of Chemistry by Author "Rees, C. W."

Now showing items 1-10 of 10

    • Article  

      Chemistry of 4-chIoro-5-cyano-l,2,3-dithiazoIium chloride 

      Koutentis, Panayiotis Andreas; Rees, C. W. (1999)
      The title compound 2, modelled on Appel salt 1, reacts as rapidly as 1 with phenols and anilines
    • Article  

      Chemistry of 4-dicyanomethylene-1,2,6-thiadiazines 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2000)
      The chlorine atoms in 3,5-dichloro-4-dicyanomethylene-1,2,6-thiadiazine 1 are readily displaced by thiophenols in the presence of Hünig's base, the first at -78 °C and the second at 20 °C to give the orange mono- and ...
    • Article  

      Conversion of a 1,2,3-dithiazole into a 3H-pyrrole-3-thione and a 3H-pyrrol-3-ylidenephosphorane 

      Koutentis, Panayiotis Andreas; Rees, C. W.; White, A. J. P.; Williams, D. J. (1998)
      Treatment of the readily available dicyanomethylenedithiazole 1 with excess of morpholine or triphenylphosphine gives the 3-azacyclopentadienethione (3H-pyrrole-3-thione) 5 and the 3-azacyclopentadienylphosphorane ...
    • Article  

      Cyclisation chemistry of 4H-1,2,6-thiadiazines 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2000)
      3,5-Dichloro-4H-1,2,6-thiadiazin-4-one 1 condenses rapidly at room temperature with 1,2-diaminobenzene, 2-aminothiophenol and sodium 2-aminophenoxide to give, respectively, the purple thiadiazinoquinoxaline 4a, red ...
    • Article  

      New routes to benzothiophenes, isothiazoles and 1,2,3-dithiazoles 

      Emayan, K.; English, R. F.; Koutentis, Panayiotis Andreas; Rees, C. W. (1997)
      4,5-Dichloro-1,2,3-dithiazolium chloride 1 condenses with active methylene compounds, such as malononitrile, barbituric acid and Meldrum's acid, to give the dithiazol-5-ylidene derivatives, such as 3,4 and 5, in modest ...
    • Article  

      Reaction of Herz salts with malononitrile: A general route to (6H-1,2,3-benzodithiazol-6-ylidene)malononitriles 

      Koutentis, Panayiotis Andreas; Rees, C. W. (2002)
      6-Chloro-1,2,3-benzodithiazolium chlorides 1 (Herz salts) react with malononitrile to afford the highly coloured ylidenes 2 in low to moderate yields. The reaction is general but complex and in the case of the 6-chloro-4 ...
    • Article  

      Reaction of tetracyanoethylene with SCL2: New molecular rearrangements 

      Koutentis, Panayiotis Andreas; Rees, C. W.; White, A. J. P.; Williams, D. J. (2000)
      The chloride ion catalysed addition of SCl2 to TCNE gives the dicyanomethylene-1,2,6-thiadiazine 3 as major product together with two unexpected minor products, pyrimidine 4 and pyrroloimidazothiadiazine 5, whose X-ray ...
    • Article  

      Reactions of 1,2,3-dithiazoles with halogenated malononitriles 

      Christoforou, Irene C.; Koutentis, Panayiotis Andreas; Rees, C. W. (2002)
      Dibromomalononitrile 3a reacts with 4-chloro-1,2,3-dithiazole-5-thione 9 and monobromomalononitrile 3c reacts with 4,5-dichloro-1,2,3-dithiazolium chloride 4 (Appel salt) to give 4-chloro-5H-1,2,3-dithiazole-5-ylidenemalononitrile ...
    • Article  

      Reactions of tetracyanoethylene oxide with 1,2,3-dithiazoles 

      Koutentis, Panayiotis Andreas; Rees, C. W. (1998)
      In the synthesis of dicyanomethylene-1,2,3-dithiazole 2 from dithiazolethione 1 and tetracyanoethylene oxide (TCNEO), formation of the thione-oxide (sulfine) 3 becomes competitive under mild conditions, in the first transfer ...
    • Article  

      Regiospecific Suzuki coupling of 3,5-dichloroisothiazole-4-carbonitrile 

      Christoforou, Irene C.; Koutentis, Panayiotis Andreas; Rees, C. W. (2003)
      3,5-Dichloroisothiazole-4-carbonitrile 1 reacts with aryl- and methylboronic acids to give in high yields the 3-chloro-5-(aryl and methyl)-isothiazole-4-carbonitrile 2 regiospecifically. The reaction was optimized with ...