Isolation, Characterization and X-ray Structure Determination of 2,5-Bis(4-methylbenzylthio)-1,3,4-thiadiazole
作者:Shahedeh Tayamon、Edward R. T. Tiekink、Farzad Nikpour、Thahira Begum S. A. Ravoof、Mohamad Ibrahim Mohamed Tahir、Karen A. Crouse
DOI:10.1007/s10870-013-0474-2
日期:2014.1
The reaction of hydrazine hydrate with carbon disulfide and 4-methylbenzyl chloride in basic solution yielded 2,5-bis(4-methylbenzylthio)-1,3,4-thiadiazole (C18H18N2S3, compound 1) in addition to the expected S-4-methylbenzyldithiocarbazate. The molecule has approximate twofold symmetry with the C=S bond lying on the pseudo axis. The five membered ring is planar with the three S atoms mutually syn, and with pendent 4-methylbenzylthio substituents; the dihedral angle between the terminal rings is 52.21(7)°. The compound 1 crystallizes in the triclinic space group $$P\bar1}$$ with a = 6.0139(3) Å, b = 11.8694(7) Å, c = 12.6330(7) Å, α = 72.583(5)°, β = 82.827(4)°, γ = 89.882(4)° and Z = 2. In situ cyclization of an authenticated dithiocarbazate gave rise to a supramolecular layerered assembly of new molecules containing a 1,3,4-thiadiazole ring system having a strictly planar central core with mutually syn sulfur atoms and terminal aryl groups twisted out of this plane.
水合肼与二硫化碳和 4-甲基苄基氯在碱性溶液中反应,除了预期的 S-4- 之外,还生成 2,5-双(4-甲基苄硫基)-1,3,4-噻二唑(C18H18N2S3,化合物 1)苄基二硫代氨基甲酸甲酯。该分子具有近似双重对称性,C=S 键位于伪轴上。五元环是平面的,三个S原子相互同位,并且具有侧挂的4-甲基苄硫基取代基;端子环之间的二面角为52.21(7)°。化合物 1 在三斜空间群 $$P\bar1}$$ 中结晶,其中 a = 6.0139(3) Å, b = 11.8694(7) Å, c = 12.6330(7) Å, α = 72.583(5) °、β = 82.827(4)°、γ = 89.882(4)° 和 Z = 2。经过验证的二硫代氨基甲酸酯的原位环化产生了含有 1,3,4-噻二唑环系的新分子的超分子层状组装体具有严格平面的中心核心,具有相互顺式的硫原子和从该平面扭曲的末端芳基。