Synthesis of 5,5′-Diaryloxymethyl-2,2′-(1,4-Phenylenedioxydiacetylamido)-Bis(1,3,4-Thiadiazoles)

5,5′-Diaryloxymethyl-2,2′-(1,4-phenylenedioxydiacetylamido)-bis(1,3,4-thiadiazoles) (4a–h) are synthesized via the cyclization of 1,1′-diaryloxyacetyl-4,4′-(1,4-phenylenedioxydiacetyl)-bis(thiosemicarbazides) (3a–h) in the presence of glacial acetic acid.