methyl radical


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  • noun

Synonyms for methyl radical

the univalent radical CH3- derived from methane

References in periodicals archive ?
M[S.sup.3] spectrum, the fragment ions at m/z 350 and 321 individually result from the neutral loss of methyl radical and C[O.sub.2].
The formation of R133a in this study does point to the formation of methyl radicals or other highly reactive species that could lead to further defluorination of R-134a and the eventual formation of TMA at later stages of the reactions.
Methyl radicals (Equation 1) or, alternatively, carbocations (Equation 2) (collectively termed radicals) that potentially form are highly reactive species and would lead eventually to the formation of pyrophoric TMA and TMS inside HVAC&R systems.
Inefficiencies result from the [beta]-scission of alkoxy radicals to ketone + methyl radicals [4, 5], the latter being much less reactive in hydrogen abstraction than the cumyloxyl intermediates derived directly from dicumyl peroxide (DCP) thermolysis [6], Further inefficiency arises from macro-radical termination by disproportionation to alkane + olefin, which has no immediate effect on the polymer's architecture.
Given that nitroxyl functionality will trap methyl radicals and polymer macro-radicals at a rate that is limited only by molecular diffusion, the rate of alkoxyamine formation is controlled strictly by the rate of peroxide thermolysis.
The most influential of these developments came in 1929 when Frederich Paneth in Berlin conducted his famous metal mirror experiment, in which the thermal decomposition of tetramethyl lead flowing through a hot tube laid down a lead mirror, and when cool this mirror could subsequently be removed by methyl radicals generated in another such thermolysis.
The DCP first decomposed thermally to dicumyloxy radicals that further decomposed to methyl radical plus phenylisopropanol.
The [.sup.13.C] NMR spectra obtained after heating of DCP and TEMPO confirmed that one of the primary sinks for TEMPO is indeed adduction to the methyl radical generated after thermal decomposition of DCP.
This unusual induction period is presumed to correspond to rapid trapping of carbon-centered polymer and methyl radicals generated from peroxide decomposition, leading to partial grafting of the TEMPO derivative.
It is hypothesized that one end of bis-TEMPO molecules first trapped polymer radicals (as well as methyl radicals from peroxide decomposition) followed by radical-trapping with the pendant nitroxyls.
methyl radicals) arising spontaneously from peroxide decomposition.
In the case of some carbons, multiple peaks were observed indicating the production of several related structures, such as adducts of TEMPO to different locations on the hydrocarbon substrate or to C16 versus methyl radicals. The carbon labeled 2 and 6, for instance, shows five resolved peaks of differing intensities, corresponding to the methyl adduct and at least three distinct attachments to the C16 substrate.
Hydrogen atom transfers can present more substantial activation energy barriers, reaching 42.4 kJ/mole for the gas-phase reaction of methyl radicals with propane [30].