Intramolecular reactions of free radicals formed from artemisinin |
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| Authors: | Evgeny Denisov Taisa Denisova Fyaz Ismail |
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| Institution: | 1. Institute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow Region, 142432, Russia;2. School of Pharmacy & Chemistry, Liverpool John Moores University, Liverpool, L3 3AF, UK |
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| Abstract: | Two cyclic alkoxyl radicals are formed as a result of peroxide bridge scission in artemisinin. Intramolecular reactions of these radicals induce the cascade of reactions of isomerization, decyclization, and decomposition of formed free radicals. It includes 14 reactions of intramolecular free radical hydrogen transfer, 17 reactions of decyclization of alkoxyl and alkyl radicals, and 4 reactions of decomposition of alkoxyl, acyl, and carboxyl radicals. The enthalpies of these 35 reactions are calculated. Using intersection parabolas method, activation energies and rate constants of all these reactions are calculated. The most rapid reactions are selected for every intermediate free radical. © 2005 Wiley Periodicals, Inc. Int J Chem Kinet 37: 554–565, 2005 |
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