Investigations of structure and conformation. Part 14. INDO and electron spin resonance studies of aliphatic sulphonyl radicals

A conformational analysis is presented for a series of aliphatic sulphonyl radicals RSO2·; this is based on the magnitudes of hyperfine splittings from α- and β-protons (Cβ–Cα–SO2·), on the obervation of line broadening resulting from restricted rotation about both the Cα–S and the Cβ–Cα bonds, and on the results of molecular orbital calculations employing the INDO (Intermediate Neglect of Differential Overlap) method. The spectra and structure of the novel alkenesulphonyl radicals (e.g. CH2CHSO2·) are also described.