Oxidation and antioxidants in organic chemistry and biology by Evgeny T. Denisov, Igor B. Afanas'ev

By Evgeny T. Denisov, Igor B. Afanas'ev

Delivering a finished assessment of reactions of oxidation for various periods of natural compounds and polymers, and organic strategies mediated through loose radicals, Oxidation and Antioxidants in natural Chemistry and Biology places the knowledge and bibliographical info you wish into one easy-to-use source. you'll find up to date information regarding mechanisms of motion of antioxidants, their reactivity, reactions of intermediates, synergism, and antioxidants with cyclic mechanism motion. offering valuable, quantitative facts in tables that make the data effortless to discover, the authors spotlight the peculiarities of mechanisms fascinated with the oxidation of hydrocarbons, polymers, and various natural compounds. The booklet presents tabulated values of strengths of C-H bonds of oxygen-containing compounds; of O-H bonds of hydroperoxides, alcohols, and acids; and of attacked antioxidant bonds. The authors acquire and speak about over 3000 cost constants of other reactions of peroxyl radicals in oxidation and co-oxidation. They describe a brand new semiempiric idea of reactivity of reactants in basic oxidative steps and the set of rules of calculation of activation energies, fee constants, and geometrical parameters of the transition states of loose radical reactions. After elucidating the chemistry and kinetics of antioxidant motion, the e-book covers oxidative methods that take place in organic platforms.

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CH2 CHMe2 À! Me2 C(OOH)CH2 C. Me2 R1 R2 C(OO. )OH À! R1 R2 C¼¼O þ HO2 . Thus, free valence persists whenever an atom or a radical undergoes a unimolecular reaction or interacts with valence-saturated molecules (possessing an even number of electrons). This is a natural consequence of conservation of the number of electrons in chemical reactions. Therefore, free valence cannot persist when a radical reacts with a radical. Both reactants have an odd numbers of electrons, and the product formed has an even number of electrons, for example, RO2 .

ROOH þ R1 R2 C. OOH R1 R2 C. OOH À! R1 R2 C(O) þ HO. 2. Acids catalyze the decomposition of secondary hydroperoxide with the formation of carbonyl compounds [46,83]. R1 R2 CHOOH þ HA R1 R2 CHOOH2 þ þ AÀ R1 R2 CHOOH2 þ À! R1 R2 C(O) þ H3 Oþ 3. Acid catalyzes the decomposition of tertiary a-arylhydroperoxide and gives phenol and ketone [46,84]. PhR1 R2 COOH þ HA PhR1 R2 COOH2 þ þ AÀ PhR1 R2 COOH2 þ þ H2 O À! PhOH þ R1 R2 C(O) þ H3 Oþ 4. Tertiary hydroperoxide is decomposed to alkoxyl and peroxyl radicals, for example [67]: 2R1 R2 R3 COOH À!

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