The recognition of the factors which influence the chemo-, regio-, and
stereo-selectivity of organic free radical reactions has underpinned
recent developments in the application of such reactions to the synthe
sis of complex molecules. In this review the role of thermochemical, s
tereoelectronic, steric, and polar effects in determining selectivity
will be discussed and illustrated with examples drawn mainly from rece
nt work carried out at the Australian National University.