Phenyl radicals are highly reactive species capable of atom abstraction from substrates and addition to substrates. They play an important role as intermediates in organic chemistry. Unfortunately for an experimentalist, phenyl radicals absorb light in the UV-region of the light spectrum which makes the direct monitoring of phenyls by ns laser flash photolysis impossible. Due to this fact many rate constants of phenyls were obtained by comparing the rate of phenyl radical reaction with that of a concurrent reaction with a known rate constant. An important addition reaction of (substituted) phenyl radicals to aromatic rings is described.