Free radicals quinone synthesis

Due to some special structural and magnetic peculiarities, in particular, free-radical properties, the quinone ligands and their metal complexes are apart from the other kinds of coordination compounds [125a, 138a], as will be shown below. Here we present an overview of the main methods for the synthesis of complexes containing benzoquinone, semiquinone, and catecholate ligands, and peculiarities of the products. 

The carbazoquinodns are carbazole-3,4-quinone alkaloids and have been isolated from Streptomyces violaceus 2942-SVS3 [61]. They are strong antioxidative agents and thus represent potential drugs for the treatment of diseases initiated by oxygen-derived free radicals. We have developed an effident synthesis of carbazoquinodn C using palladium(II)-catalyzed oxidative cydization as the key step (Scheme 15.17, Table 15.2) [62]. 

The formation and subsequent [4 + 4] cycloaddition of pendant benzo-quinone dimethide species was utilized by Hawker and coworkers in the synthesis of architecturally defined SCNPs (Figure 4.2). Statistical copolymers of 4-vinylbenzocyclobutene were synthesized by nitroxide-mediated free radical polymerization. The nanoparticle synthesis employed a continuous addition strategy, in which a concentrated polymer solution... 

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