Radical trappers

Four Lewis acids and a radical trapper were used as additives in PMI in order to alternate the degradation mechanisms to... 

It is unclear whether silicon metal is only the radical trapper of preformed SiX2 radicals, or whether the first step is a reaction of silicon with SiCl4. 

Doxorubicin . Intercalator, forms free radicals, inhibits topoisomerase Hodgkin s (ABVD), breast, endometrial, lung, ovarian CA BMS—delayed CHF (dexrazoxane is an iron-chelating agent preventing the formation of free radicals it is not a free radical trapper ), alopecia, vesicant, radiation recall ... 

The water elimination rate of f-butanol has been studied in the presence of the radical trapper 1,3,5-trimethylbenzene in a variable pressure flow reactor. The work is significant as it represents the first absolute uncertainty analysis for f-butanol dehydration, for which there is much literature data. 

Stable radicals trapped in the polymer matrix participate in termination but not in the chain growth. The polymer matrix saturated with stable radicals can act as a radical trapper in which deactivation of primary radicals takes place. Stable radicals may be deactivated, however, through the reaction with primary radicals. 

The structures of the palladium sulfides have been confirmed clearly by scanning electron microscopy (SEM) study [26]. When Pd(OAc)2 dissolved in alkyne in the presence of y-terpinene is allowed to react with cyclohexanethiol upon microwave heating, nanostructured Pd species (Pd nanobelts) is formed in 85% yield. y-Terpinene acts as an excellent radical trapper and suppresses the formation of anfi -Markovnikov addition product 3 by radical pathway. On the other hand, the addition of thiols to Pd(OAc)2 followed by addition of alkyne leads to amorphous particles in the pm-size region. The formed Pd nanobelts exhibits excellent catalytic activity toward the hydrothiolation of aUcynes. In particular, the hydrothiolation with aUcanethiols proceeds efficiently with excellent regioselectivity upon microwave heating (Scheme 6). 

Nb- and Ti-containing silica-based mesoporous molecular sieves were used as catalysts for photocatalytic oxidation of methane. It is found that methanol was formed at 323 K and water pre-adsorbed samples exhibited higher catalytic activity than their pure metal oxides. By comparison with Nb-MCM-41, Ti-MCM-41 gave better methane conversion and methanol yield although traces of formaldehyde were observed over Nb-MCM-41 catalyst. Interestingly, OH radical was detected by the in-situ ESR spectroscopy using DMPO as trapper. 

Trapper et al. ° have reinvestigated a typical Gif system to lend support to the proposition of a preponderant, carbon- and oxygen-centered radical pathway rather than the nonradical pathway by Barton and Doller. The monomeric... 

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