cis-[4a]-cisoid-[4a,4b]-cis-[4b]-1,3,6,8,8a,8b-Hexa-methylperhydro-1,3,6,8-tetraazabiphenylene-2,4,5,7-tetraone

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 same side of the cyclo­butane ring (cis) and that the monomers are oriented head-to-head (syn).