Radical Chain Reactions. Substitution Theory J. B. Dumas (1800 -1884) C 4 H 4 O 2 + Cl 6 = C 4 HCl 3 O 2 + H 3 Cl 3 C = 6, O = 16 C 2 H 4 O 2 + 3Cl 2.
