A new type of substituted benzothiopyranone, 3-phenyl-2-(2-phenylhydrazino)-4H-1-benzothiopyran-4-one, has been prepared by the condensation-acid cyclization of polylithiated phenylacetic acid phenylhydrazide with lithiated methyl thiosalicylate. Absorption spectra, especially 13C NMR, provided good indication of its structure, which was conclusively established with X-ray crystal structure analysis. In comparison to the few benzothiopyran X-ray reports documented, the benzothiopyranone ring of the molecule was found to be essentially planar, with the 3-phenyl ring nearly perpendicular to the benzothiopyranone fused-ring system. Crystals of C21H16N2OS are orthorhombic, P212121, a = 10.140(4) Å, b = 10.432(4) Å, c = 16.228(7) Å, Z = 4, V = 1717(1) Å3, R 1 = 0.0267 and wR 2 = 0.0725 for reflections with I > 2σ(I). The molecular packing in the crystal is the result of N–H···O hydrogen bonding. X-ray crystal analysis confirmed the structure of 3-phenyl-2-(2-phenylhydrazino)-4H-1-benzothiopyran-4-one prepared by the condensation–cyclization of polylithiated phenylacetic acid phenylhydrazide with lithiated methyl thiosalicylate.
一种新型取代的苯并
噻喃酮--3-苯基-2-(2-苯
肼基)-4H-1-苯并
噻喃-4-酮,是通过多
硫代
苯乙酸苯
肼与
硫代水杨酸甲酯的缩合-酸环化反应制备的。吸收光谱,尤其是 13C NMR,为其结构提供了良好的指示,X 射线晶体结构分析最终确定了其结构。与记录在案的少数苯并
噻喃 X 射线报告相比,发现该分子的苯并
噻喃酮环基本上是平面的,3-苯基环几乎垂直于苯并
噻喃酮熔环系统。
C21H16N2OS 晶体为正方体,P212121,a = 10.140(4) 埃,b = 10.432(4) 埃,c = 16.228(7) Å, Z = 4, V = 1717(1) Å3, R 1 = 0.0267 and wR 2 = 0.0725 for reflections with I > 2σ(I).晶体中的分子堆积是 N-H-O 氢键作用的结果。X 射线晶体分析证实了 3-苯基-2-(2-苯
肼基)-4H-1-苯并
噻喃-4-酮的结构,该结构是由多
硫代
苯乙酸苯
肼与
硫代水杨酸甲酯缩合-环化反应制备的。