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Alkylbenzene dehydrocyclization

V. The Dehydrocyclization of Alkylbenzenes Over Chromia-Alumina Catalysts... [Pg.314]

Apparently, nonacidic chromia-alumina catalyzes C5-dehydrocyclization only when the new bond is formed between a primary carbon atom and the aromatic ring. We know that the isomerization of alkylbenzenes over nonacidic chromia-alumina involves free-radical intermediates and proceeds by phenyl or vinyl migration (41, 42). One can speculate that dehydrocycli-zation also has a free-radical mechanism here. [Pg.315]

The rate of dehydrocyclization increase with the number of aromatic rings in the molecule (19). The dehydrocyclization of alkylnaphthalenes can follow the same pathways as the cyclization of alkylbenzenes C5-dehydro-cyclization gives benzindans and benzindenes, while C6-dehydrocyclization yields anthracenes and phenanthrenes. In addition to these two pathways, a-substituted alkylnaphthalenes can cyclize to acenaphthenes and acenaphthylenes ... [Pg.315]

See other pages where Alkylbenzene dehydrocyclization is mentioned: [Pg.74]    [Pg.293]    [Pg.293]    [Pg.293]    [Pg.295]    [Pg.296]    [Pg.65]   
See also in sourсe #XX -- [ Pg.296 , Pg.297 , Pg.298 , Pg.299 , Pg.300 , Pg.301 , Pg.302 , Pg.303 , Pg.304 , Pg.305 , Pg.306 , Pg.307 , Pg.308 , Pg.309 , Pg.310 , Pg.311 ]



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Alkylbenzenes

Dehydrocyclization

The Dehydrocyclization of C10 and Higher Alkylbenzenes

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