Buy article online - an online subscription or single-article purchase is required to access this article.
organic compounds
The X-ray structure of di-tert-butyl cis-transoid-cis-perhydro-3,3,6,6-tetramethyl-1,4- dioxocyclobuta[1,2-c:3,4-c']dipyrrole-2,5-dicarboxylate, C22H34N2O6, which is the major photocyclodimer obtained on hexadeuterioacetone-sensitized irradiation of the tert-butyl 2,5-dihydro-5,5-dimethyl-2-oxo-1H-pyrrole-1-carboxylate monomer, was determined in order to establish its constitution and configuration unambiguously.