Molecular structures of methyl 5,6-diaryl-1,2,4-trimethyl-7-oxobicyclo[2.2.1]hept-5-en-2-endo-carboxylates (aryl = phenyl or o-methoxyphenyl)

Structural assignments based on a reconstruction from the H-1 NMR dynamic b ehavior of the three 5,6-bis(substituted aryl)-7-oxo-5-nolbornene-2-carboxy lic eaters named in the title have received confirmation from X-ray crystal lographic studies. The specific structural features of these systems are co mpared among themselves and with those of 7-oxo-5, 6-diphenyl-5-norbornene- 2-carboxylic eaters, analogues systems without substitution on the phenyl g roups, which were studied earlier.