Carbazoles free radical synthesis

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]. 

Wu HX, Qiu XQ, Cai RE, Qian SX. Poly(A-vinyl carbazole)-grafted multiwalled carbon nanotubes synthesis via direct free radical reaction and optical limiting properties. Appl Surf Sci 2007 253(11) 5122-8. 

Since the discovery of photoconductivity in poly(N-vinylcarbazole) (PVK) [1,2] a variety of polymers with carbazole groups have been synthesized and their photophysical properties have been investigated. The main topic of this article is the synthesis of photoconductive polymers, so minor attention is given to their photophysical properties. PVK (2b) can be synthesized by free-radical, cationic, or charge-transfer initiated polymerization of N-vinylcarbazole (2a). A detailed description of the PVK synthesis is given in Chapter 2 of this handbook. 

Polymers with pendant carbazole groups described in this section are usually prepared either by addition polymerization (most frequently free-radical) or by polymeranalogous reactions. Ogava et al. [216] have reported on the synthesis of a carbazolyl-substituted polymer by polycondensation. By condensing a carbazole-containing bisphenol with phosgene they... 

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