R Cosmo

S Sternhell

Dehydrogenation rates of four 4,5-disubstituted 9,l0-dihydrophenanthrenes to the corresponding  phenanthrenes  by 10% palladium on charcoal for the substituents, H, OCH3, F and CH3, appear to be related to the size of the substituents. The preparation of three new  phenanthrenes, viz. 4,5-dichlorophenanthrene, 4,5-difluoro-phenanthrene and 4,5-bis( trifluoromethyl ) phenanthrene, is described. Treatment of  mesitylene  with either 10% palladium on charcoal at reflux or 2,3-dichloro-5,6- dicyano-1,4-benzoquinone gives an appreciable yield of mesityl(3',5'-xylyl)methane. </jats:p

Dehydrogenation of 4,5-Disubstitued 9,10-Dihydrophenanthrenes

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