Chain propagation (sometimes referred to as propagation) is a process in which a reactive intermediate is continuously regenerated during the course of a chemical chain reaction. For example in the chlorination of methane, there is a two-step propagation cycle involving as chain carriers a chlorine atom and a methyl radical
- Cl + CH4 → HCl + CH3
- CH3 + Cl2 → CH3Cl + Cl.
- chain reaction IUPAC Gold Book
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