The 3,3,6,6-Tetramethyl cis-transoid-cis-Photocyclodimer of tert-Butyl 2,5-Dihydro-5,5-dimethyl-2-oxo-1H-pyrrole-1-carboxylate

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.

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