of 1:1 thiacrown ether macrocycles 5a―c containing a fused cyclopenteno[c]2,2'-bipyridine subunit has been accomplished through first homo-coupling of 1,2,4-triazine bisulfides 3a―c tethered to poly(ethylene glycol) chains with potassium cyanide and second Diels―Alder/retro-Diels―Alder reaction of such obtained thiamacrocycles 4a―c with 1-pyrrolidino-1-cyclopentene. Macrocycles 5a―c were oxidized to