Synthesis and Crystal Structure Determination of 3-Phenyl-2-(2-phenylhydrazino)-4H-1-benzothiopyran-4-one

Autor: Stefan J. Pastine, Clyde R. Metz, Charles F. Beam, William T. Pennington, John D. Knight
Rok vydání: 2010
Předmět:
Zdroj: Journal of Chemical Crystallography. 40:536-540
ISSN: 1572-8854
1074-1542
DOI: 10.1007/s10870-010-9692-z
Popis: 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) A, b = 10.432(4) A, c = 16.228(7) A, Z = 4, V = 1717(1) A3, 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.
Databáze: OpenAIRE
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