A four-member ring hypervalent iodine radical has been detected in the lase
r flash photolysis of 1,3-diiodo-1,3-diphenylpropane. This species absorbs
at 320 nn, has a lifetime of similar to 9.5 mu s in cyclohexane, and is not
quenchable by oxygen. Excitation of this radical by means of laser-drop ph
otolysis results the formation of trans-1,2-diphenylcyclopropane through co
ncerted iodine extrusion.