Formation of peroxyl radicals in solution / Zeev B. Alfassi -- Methods of preparing organic peroxy radicals for laboratory studies / Ole J. Nielsen and Timothy J. Wallington -- Structure of organic peroxyl radicals / L.R.C. Barclay -- The thermochemistry of peroxides and polyoxides, and their free radicals / S.W. Benson and N. Cohen -- Ultaviolet absorption spectra of peroxy radicals in the gas phase / Ole J. Nielsen and Timothy J. Wallington -- Combination of peroxyl radicals in the gas phase / Robert Lesclaux -- Reactions of organic peroxy radicals in the gas phase / T.J. Wallington, O.J. Nielsen and J. Sehested -- Peroxyl radicals in aqueous solutions / Clemens von Sonntag and Heinz-Peter Schuchmann -- Kinetic studies of organic peroxyl radicals in aqueous solutions and mixed solvents / Z.B. Alfassi, R.E. Huie and P. Neta -- Reactions of organic peroxyl radicals in organic solvents / J.A. Howard -- Electron spin resonance studies of peroxyl radicals in solid matrices / Christopher J. Rhodes -- Organic peroxy radicals in polymeric systems / Yasuro Hori -- The reactions of HO2/O2- radicals in aqueous solution / Diane E. Cabelli -- Heteroatom peroxyl radicals / Heinz-Peter Schuchmann and Clemens von Sonntag -- Peroxy radicals and