Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 8 (August 2007)

organic compounds

 

Two (E)-2-arylidene-1,4-di-p-tosyl-1,2,3,4-tetrahydroquinoxaline compounds: supramolecular frameworks built with C-HO and C-H(arene) hydrogen bonds and - stacking interactions

S. Ghosh, R. Mukhopadhyay, M. Helliwell and A. K. Mukherjee

Abstract: The pyrazine ring in two N-substituted quinoxaline derivatives, namely (E)-2-(2-methoxybenzylidene)-1,4-di-p-tosyl-1,2,3,4-tetrahydroquinoxaline, C₃₀H₂₈N₂S₂O₅, (II), and (E)-methyl 2-[(1,4-di-p-tosyl-1,2,3,4-tetrahydroquinoxalin-2-ylidene)methyl]benzoate, C₃₁H₂₈N₂S₂O₆, (III), assumes a half-chair conformation and is shielded by the terminal tosyl groups. In the molecular packing of the compounds, intermolecular C-HO hydrogen bonds between centrosymmetrically related molecules generate dimeric rings, viz. R₂²(22) in (II) and R₂²(26) in (III), which are further connected through C-H(arene) hydrogen bonds and - stacking interactions into novel supramolecular frameworks.

Formula: C₃₀H₂₈N₂O₅S₂ and C₃₁H₂₈N₂O₆S₂

	Structure factor file (CIF format) (250.6 kbytes) [ doi:10.1107/S0108270107032234/sk3138IIsup2.hkl ] Contains datablock II
	Structure factor file (CIF format) (222.0 kbytes) [ doi:10.1107/S0108270107032234/sk3138IIIsup3.hkl ] Contains datablock III

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