Sequential homo-coupling Diels–Alder/retro Diels–Alder reaction of 5,5′-bi-1,2,4-triazine-containing thiamacrocycles as a new route to thiacrown ethers incorporating a 2,2′-bipyridine subunit
A newroute to thiacrown ethers 5a–d and 6a–d incorporating a 2,2′-bipyridine subunit is elaborated using, (1) homo-coupling of 1,2,4-triazine sulfides 3a–d tethered to poly(ethylene glycol) chains with potassium cyanide and (2) Diels–Alder/retro Diels–Alderreaction with norbornadiene or 1-pyrrolidino-1-cyclopentene as the key steps.
Anti-oxidative properties of bi-1,2,4-triazine bisulphides
作者:Paweł Piszcz、Bronisław Głód
DOI:10.2478/s11696-013-0355-3
日期:2013.1.1
The anti-oxidative properties of bitriazines (BTs) were evaluated using HPLC and cyclic voltammetry. In the first case, a RP-HPLC assay was made, using a fluorescence detector, hydroxyl radicals generated in Fenton reaction, and terephthalic acid as a spin trap. The measurements were performed using aqueous or methanolic solutions. It was found that when the BTs were dissolved in water they were antioxidants