(IUCr) Crystallography Journals Online

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Acta Cryst. (2002). E58, o413-o414 [ doi:10.1107/S160053680200449X ]

cis-[4a]-transoid-[4a,4b]-cis-[4b]-1,3,6,8,8a,8b-Hexamethylperhydro-1,3,6,8-tetraazabiphenylene-2,4,5,7-tetraone

C. Näther, O. Krüger and U. Wille

Abstract: The title compound, C₁₄H₂₀N₄O₄, was prepared by [2+2]-photocycloaddition of 1,3,6-trimethyluracil in acetone. The structure determination was undertaken in order to determine the stereoconfiguration of the product, which could not be extracted from NMR data. Single-crystal X-ray analysis revealed that the methyl groups are located on the opposite sides of the cyclobutane ring (trans) and that the monomers are oriented head-to-head (syn).

Online 15 March 2002