The study of Friedel-Crafts acetylation of phenanthrene with acetic acid in polyphosphoric acid, along with rearrangements and deacetylations of acetylphenanthrene isomers, indicated its reversibility. The structures of (E)-2- AcPHN and (Z)-9-AcPHN were determined by X-ray crystallography. PM3 calculations predicted that 9-AcPHN is the kinetically controlled while 2-AcPHN and 3-AcPHN are the thermodynamically controlled products, in accordance with experiment. The mutual rearrangements of 2-AcPHN and 9-AcPHN are noted.
Keywords: PPA, overcrowding, Agranat-Gore rearrangement, deacylation, PM3 calculations, X-ray crystallography
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