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the nitrone spin trap PBN.2a For example, ferf-butylethylene gives a radical yield of 0.1% using the BHT method; PBN gives a radical yield of 0.004% with this olefin, confirming our suggestion24 that PBN traps radicals with about 1 % efficiency in these ozone systems.21"This work demonstrates the usefulness of BHT as a "spin trap". Carbon-centered radicals can be converted to peroxyl radicals in the presence of oxygen, and BHT traps these radicals with high efficiency. The use of BHT in place of a nitrone spin trap clearly conveys some advantages: BHT yields a stable, diamagnetic species that can be quantified by normal chromatographic methods, rather than by ESR. While the identification of the radical that is trapped by BHT using GC/MS is not trivial, our data do show that this identification can be made (at least for simple R groups) using GC/MS in collaboration with NMR.NMR spectra, and Figure 3,13C NMR spectra of compounds 1 and 2a (3 pages). Ordering information is given on any current masthead page.