Base-induced, addition dehydrogenation

A nice feature of reductive as well as oxidative coupling reactions has been presented recently in the synthesis of quateranthene 132 (Scheme 32) [82]. After addition of the lithiated species of 128 into the bianthrone and dehydrogenation, base induced cyclization gave the intermediate 130. Grignard addition to the ketone and subsequent reduction delivers 131, which was then fully aromatized by a Scholl-reaction involving DDQ as an oxidant in the presence of Sc(OTf)3. 

Nafta reforming and alkane dehydrogenation processes are directly connected on platinum alumina based catalysts. The stability and selectivity requirements for industrial purposes induced the addition of a second metal like Sn, Ge or Re. In fact, these promoters coupled to other acidity controllers added on the support enhanced the catalytic efficiency [1-3]... 

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