Abstract
Pentacene was first obtained by dehydrogenation of dihydropentacene (V). This is formed by pyrolysis of the ketones (I), (II) and (III). Pentaphene (see p. 353) is also produced as a by-product, sometimes even by re-arrangement of the ketones. Dibenzoyl-m-xylene (I) is prepared from xylene, benzoyl chloride and aluminium chloride under rather drastic conditions. The ketone (II) is formed from terephthaloyl chloride and o-tolyl magnesium bromide and the ketone (III) is obtained from 4benzyl-1,3-dimethylbenzene, benzoyl chloride and aluminium chloride.1
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