3 a-Ethandione rearrangement Naoh COoNa h,+ COOH Ph-C-C-Ph Etoh Phc Phc OH OH O OH Ph-c-c-Ph= Ph-C-C-0 Ph-c-C=0 Ph OH O Ph-C—C=0 Ph3 α-Ethandione Rearrangement Ph C C Ph O O NaOH EtOH Ph2 C COONa OH H3O + Ph2 C COOH OH Ph C C Ph O O OH - Ph C C Ph O OH O - Ph C C Ph O OH - O Ph C C Ph OH O - O