Simply Mechanisms 13a. Free radical substitution (methane and chlorine in uv light)
Автор: FranklyChemistry
Загружено: 2016-06-08
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This video looks at the free radical substitution mechanism of methane reacting with chlorine in UV light. It is a complex mechanism that is split into 3 separate stages. Stage 1 is called Initiation. Here some chlorine molecules split into chlorine radicals with the help of the energy of uv light. Stage 2 is called Propagation. These reactions use a radical and form a product plus another radical to keep the reaction going. In the first example, a methane molecule reacts with a chlorine radical to form a molecule of hydrogen chloride and a methyl radical. In the second step the methyl radical goes on to react with a chlorine molecule to form the product chloromethane and yet another chlorine radical. Other H atoms can be subsequently substituted in the same manner to form dichloromethane, trichloromethane and tetrachloromethane. In Stage 3 Termination reactions occur. In these reactions, 2 radicals combine to form a product molecule. One of these termination steps is responsible for forming ethane and chlorinated ethane molecules such as CCl3CCl3.
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