Removal of hydrogen catalysed by aluminum chloride

It is possible to remove hydrogen catalytically, with formation of new carbon-carbon bonds, especially by means of aluminum chloride. The main importance of this process lies in the preparation of condensed ring systems in the aromatic series. It is convenient to differentiate an intermolecular reaction such as the formation of perylene from naphthalene from an intramolecular reaction such as formation of the same product from 1,1 -binaphthalene 269 

Scholl and his colleagues have investigated this reaction, which is accordingly known as the Scholl reaction.270,2710 

Intramolecular reactions starting from hydrocarbons, as, for example, the formation of perylene from l,l -binaphthalene mentioned above, mostly give only moderate yields. Results are better if there is a possibility for the hydrogen that is split off to be added, at least temporarily, at another situation in the 

Thomas, (a) Anhydrous Aluminum Chloride in Organic Chemistry, Reinhold Publ. Corp., New York, 1941, (b) p. 649, (c) pp. 690, 712. 

The reactionris a general one and can be carried out with any aromatic mono-or poly-ketone that has at least one position free peri to the ketone group. 

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