The [[M-H-308].sup.-] ion yields a fragment at m/z 352 by losing a methyl radical. And of the [MS.sup.4] spectrum of [[M-H-308-15].sup.-] ion, the fragment at m/z 323 can be reasonably attributed to the loss of 3-COH of flavone skeleton's C ring.
The [M.S.sup.n] spectra show the major fragment ions at m/z 501 (the loss of CO), 382 (the loss of rhamnosyl group), 367 (the loss of methyl radical from the ion at m/z 382), and 339 (the successive loss of methyl radical and CO).
R133a formation results from defluorination of R-134a followed by chlorination to form the R133a, indicating the presence of a strong reacting agent, likely the presence of methyl radical or methyl carbocation as the result of dechlorination of the R-40.
Water will suppress methyl radical or carbocation reactions by allowing for the protonation of these materials and preventing them from further reacting with other materials.
This chemistry is also remarkable in terms of its potential use of methyl radical
The fragment ion of M/Z 179 is obtained by the loss of a methyl radical
to yield the spiro cation that is shown in Scheme 1.
This decomposition reaction yields formaldehyde and a methyl radical
, consistent with the observation that [C.sub.2] hydrocarbons are formed in similar mole fraction to those in the CH4 flames, which also generate methyl radicals
in their initial reaction step.
Elimination of a methyl radical
from the isopropylidene group of bisphenol A based polysulfone, followed by hydrogen abstraction to form methane was observed but not abundant.
Interestingly, the same Friedrich Paneth responsible for the demonstration of methyl radical
formation was in charge of the chemistry group.
The methyl radical
often produced from industrial peroxide (e.g., dicumyl peroxide (DCP)) decomposition also reacts with the nitroxyl radical.
These electrophilic species  prefer hydrogen atom abstraction to addition to electron deficient olefins, whereas the opposite tendencies are observed for the nucleophilic methyl radicals
derived from cumyloxy radical fragmentation [20, 21].