L'Anhydride cis-1,2,3,6-Tétrahydrophtalique

The crystal structure of cis-1,2,3,6-tetrahydrophthalic anhydride, C₈H₈O₃, has been determined by X-ray diffraction. This bicyclic compound crystallizes in space group P2₁/a, with two independent molecules per asymmetric unit. The folded conformation found for the two molecules is in close agreement with the results obtained for other cyclic anhydrides having a similar molecular arrangement. The same feature is observed in the anhydride ring structure. The differences between the two independent molecules in the unit cell were interpreted as the result of packing effects, caused by intermolecular nucleophile-electrophile (Nu-El) interactions.

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