Acta Cryst. (2001). C57, 861-864 [ doi:10.1107/S0108270101006588 ]
Abstract: The three title quinoxaline derivatives, (E)-2-(4-methylbenzylidene)-1,4-di-p-tosyl-1,2,3,4-tetrahydroquinoxaline, C30H28N2O4S2, (II), (E)-2-(4-methoxybenzylidene)-1,4-di-p-tosyl-1,2,3,4-tetrahydroquinoxaline, C30H28N2O5S2, (III), and (E)-2-(3-chlorobenzylidene)-1,4-di-p-tosyl-1,2,3,4-tetrahydroquinoxaline, C29H25ClN2O4S2, (IV), were synthesized by palladium-catalyzed hetero-annulation. The E configuration of the exocyclic double bond in the three compounds has been established by the present X-ray study. The saturated part of the quinoxaline moiety in all three compounds assumes a distorted chair conformation. The numerical descriptors indicate a high degree of isostructurality between compounds (II) and (III), but no isostructurality with compound (IV).
Formula: C30H28N2O4S2, C30H28N2O5S2 and C29H25ClN2O4S2
Structure factor file (CIF format) (241.1 kbytes)
Structure factor file (CIF format) (229.9 kbytes)
Structure factor file (CIF format) (220.9 kbytes)
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