Electronic spectra in the 2100-2500 8, region, were reported for the allyl radical, the P-methallyl radical, the cc-methallyl radical, the p-ethallyl radical and the cyclopentenyl radical. The vibrational structures of the allyl and P substituted radicals indicate that in the main regions of absorption, the a(C-13) stretching frequency is excited. A single band progression observed in flashed allyl cyanide, was tentatively assigned to a free radical derived from pyrrole.
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