Hai‐n Li

2-(4-tert-Butyl­phen­yl)-5-{3,4-dibutoxy-5-[5-(4-tert-butyl­phen­yl)-1,3,4-oxadiazol-2-yl]-2-thienyl}-1,3,4-oxadiazole

In the title compound, C36H44N4O4S, the dihedral angles between the central thiophene ring and the pendent oxadiazole rings are 12.7 (2) and 13.7 (2)°, and the dihedral angles between the oxadiazole rings and their adjacent benzene rings are 6.1 (2) and 17.5 (2)°. An intramolecular C—H⋯O interaction may help to establish the conformation.

2-(4-Chloro-phen-yl)-5-{3,4-dibut-oxy-5-[5-(4-chloro-phen-yl)-1,3,4-oxadiazol-2-yl]thio-phen-2-yl}-1,3,4-oxadiazole.

In the title compound, C28H26Cl2N4O4S, the dihedral angles between the two chlorophenyl rings and the two oxadiazol rings are 10.51 (4)° and 13.55 (3)°, respectively. The thiophene ring is oriented at dihedral angles of 5.59 (4)°, 8.33 (4)° and 4.41 (4)°, 11.05 (3)°, respectively, with respect to the two oxadiazol and the two chlorophenyl rings. The intramolecular C—H⋯O hydrogen bond results in the formation of a five-membered ring. In the crystal structure, π–π contacts between the oxadiazol rings, the chlorophenyl rings and the chlorophenyl and oxadiazol rings [centroid–centroid distances = 3.428 (3) Å, 3.750 (3) Å and 3.768 (3) Å, respectively] are present.

5,5′-Diethyl-2,2′-(triazene-1,3-di­yl)di-1,3,4-thia­diazole

In the molecule of the title compound, C8H11N7S2, the conformation about the N=N bond is trans and the thiadiazole rings are oriented at a dihedral angle of 2.92 (3)°. In the crystal structure, intermolecular N—H⋯S hydrogen bonds link the molecules into chains. There are π–π contacts between the thiadiazole rings [centroid-to-centroid distances = 3.699 (3) and 3.720 (2) Å].

4-[3-(Chloro­meth­yl)-1,2,4-oxadiazol-5-yl]pyridine. Corrigendum

Corrigendum to Acta Cryst. (2007), E63, o4654.