EPR study of radicals derived from unsaturated cyclic ethers

As an extension of earlier EPR studies of the radicals formed from acyclic olefinic substrates with the use of the TiC1₃H₂O₂ radical-generating method, results are presented of an analogous TiC1₃H₂O₂-based investigation carried out over the temperature range 10–40°C with the use of cyclic unsaturated substrates in acidified aqueous solution, namely, Δ²-dihydrofuran, Δ²-dihydropyran, 2-methylfuran, 2-acetylfuran, and furfurylamine. The EPR spectra of six radicals produced from these cyclic substrates are reported.