Bromanilic acid

Derivatives of ubiquiaones are antioxidants for foodstuffs and vitamins (qv) (217,218). Ubichromenol phosphates show antiinflammatory activity (219). Chroman o1 compounds inhibit oxidation of fats and can be used ia treatment of macrocytic anemias (220). Monosulfate salts of 2,3-dimethoxy-5-methyl-6-substitutedhydroquiaone have been reported to be inhibitors of Hpid oxidation ia rats (221). Polymers based on chloranilic and bromanilic acid have been prepared and contain oxygenated quiaones (63), which are derived from 1,2,3,4-benzenetetrol (222). 

The composition and nature of the charge-transfer complexes of 2-quinoxalina-mine with tetrachlorobenzoquinone (chloranil), tetrabromobenzoquinone (bromanil), 1,3,5-trinitrobenzen, and picric acid have been determined likewise those of 2,3-quinoxalinediamine with chloranil and bromanil. 

By using 10mol% of benzoylquinidine (BQD, la), a variety of acid chlorides reacted efficiently with o-chloranil at — 78 °C in the presence of nonnucleophilic Hiinig base (iPr2EtN, DIPEA) (Scheme 10.2). The desired lactones 2 were produced in up to 91% yield with excellent enantiopurity. On the other hand, o-bromanil and 9,10-phenanthrene quinone were also successfully applied in this cycloaddition reaction. 

Use of nonaqueously prepared DEAE celluloses as Lewis bases offers potential for formation of metal ion complexes between transition metal ions such as Cu and Ni 2j formation of charge-transfer complexes with electron acceptor compounds such as ortho-and para-chloranils or bromanils and with other Lewis acid compounds such as BI3. 

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