Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
Crystal and molecular structure of 2,6-diphenyl-4-carboxypyrylium and 5,6,7,8-tetrahydro-8-oxo-2,4-diphenyl-1-benzopyrylium perchlorates was solved. Analysis of our data and those retrieved form CSDB shows that for compounds with sp2 carbon atoms in C4-C41 bond exists very good relationships between lengths of this bond and bond angles at oxygen and at C4 atoms in the pyrylium ring. Good correlation exists too for two aromaticity indices and these bond lengths indicating mostly resonance effect of the substituent on the geometry of the pyrylium ring.
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