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Organic Reactions Volume 4 - Sciencemadness Dot Org

Organic Reactions Volume 4 - Sciencemadness Dot Org

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30 OEGANIC REACTIONS<br />

that the Armstrong-Hinsberg structure is in equilibrium with a diradical<br />

form. The colored hydrocarbons 2,3,6,7-dibenzanthracene (pentacene,<br />

LXIII), heptacene, and l,9?5,10-di-(pen*naphthylene)-anthracene react<br />

(with simultaneous decolorization) more rapidly with maleic anhydride<br />

than does anthracene itself. In view of the facility with which the free<br />

triphenylmethyl radical combines with maleic anhydride, 245 it is suggested<br />

that these hydrocarbons react through diradical intermediates<br />

(such as LXIV). 23 ' 246 * 247 Allen and Bell, however, were able to isolate a<br />

mono- and a di-addition product from the reaction of maleic anhydride<br />

with 6,13-diphenylpentacene (LXV). 248<br />

mix ixvr<br />

It has been postulated that in 9,10-diphenylanthracene the equilibrium<br />

LXVI

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