Abstract
Conformational analyses and structural comparison of the title compound, C18H13BrN4O3·C2H6O, and the related compound 4-(4-methoxyphenyl)-3-phenyl-2,4,8,10-tetraazaspiro[5.4]dec-1-ene-6,8,10-trione acetone solvate monohydrate [Bruno, Rotondo, Nicolo, Foti, Grassi & Risitano (2005). Acta Cryst. E61, o139–o141], co-crystallized with solvent molecules, are presented. Both compounds were synthesized by the cycloaddition of C—H and C—Br nitrilimines, generated in situ, starting from the same substrate [Foti, Grassi & Risitano (2005). Synlett. Submitted]. However, different experimental conditions led to products with reverse regioselectivity.
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