AROMATIC-AROMATIC AND C-H..O INTERACTIONS IN THE CRYSTAL STRUCTURES OF O-SUBSTITUTED MYO-INOSITOLS. U. Samanta¹, D. Pal¹, V.G. Puranik¹, P. Chakrabarti¹, T.Das², T. Praveen², M.S. Shashidhar². ¹Division of Physical Chemistry, ²Division of Organic Chemistry (Synthesis), National Chemical Laboratory, Pune 411008, India.

The crystal structure of DL-2,4-di-O-benzoyl-myo-inositol-1,3,5-orthoformate (I) and its 6-O-substituted (methyl and benzoyl) derivatives have been determined, and a few more are being investigated. These compounds crystallize with two molecules in the asymmetric unit, with the aromatic rings showing different geometries of interaction. The two molecules in (I) form a compact dimer such that the benzene rings in one are nearly perpendicular to those in the other. The orthoformate CH group takes part in a CH..O interaction. Another type of CH..O interaction that is observed in all these structures involves two adjacent aromatic CH groups and a carbonyl oxygen atom.