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8369589 
Journal Article 
Tandem acylation-cycloalkylation: A novel synthesis of phenanthrenes 
Ramana, MMV; Potnis, PV 
1996 
1 
Synthesis
ISSN: 0039-7881
EISSN: 1437-210X 
Georg Thieme Verlag 
9 
1090-1092 
English 
Cyclohexene-1-acetic acid (1) undergoes reaction with various aromatic substrates 2a-k in the presence of polyphosphoric acid (PPA) to give 1,2,3,4,4a,10a-hexahydrophenanthren-9(10H)-ones 3a-k by tandem acylation-cycloalkylation, which on dehydrogenation with Pd-C afforded the corresponding phenanthrenes 4a-k in high yields. 
dehydrogenation; phenanthrenes; polyphosphoric acid; tandem acylation-cycloalkylation