free radical substitution reactions
Does anyone know how to write these reactions because I'm quite confused about it
Free radical substitution consists of the following:
- Initiation: homolytic fission of a Cl2 molecule in the presence of UV light to form Chlorine free radicals
- Propagation: Free radicals attacking molecules to generate other free radicals (like a chain reaction)
- Termination: Two free radicals reacting to form a molecule
Initiation takes place under UV light and there is only one equation: Cl2 --> 2Cl
However, for propagation, there are numerous equations that you can write:
Cl + CH4 --> CH3 + HCl (A methyl free radical is formed)
CH3 + Cl2 --> CH3Cl + Cl (A chlorine free radical is formed)
Cl+ CH3Cl --> CH2Cl + HCl (A chloromethyl free radical is formed)
I hope you can get the gist of it.
Finally, there's termination, which can be the following:
Cl + CH3 --> CH3Cl
Cl + CH2Cl --> CH2Cl2
CH3 + CH3 --> C2H6
CH3 + CH2Cl --> CH3CH2Cl
It's quite simple once you know what initiation, propagation and termination are - you can figure out the equations, rather than memorizing them.
- Initiation: homolytic fission of a Cl2 molecule in the presence of UV light to form Chlorine free radicals
- Propagation: Free radicals attacking molecules to generate other free radicals (like a chain reaction)
- Termination: Two free radicals reacting to form a molecule
Initiation takes place under UV light and there is only one equation: Cl2 --> 2Cl
However, for propagation, there are numerous equations that you can write:
Cl + CH4 --> CH3 + HCl (A methyl free radical is formed)
CH3 + Cl2 --> CH3Cl + Cl (A chlorine free radical is formed)
Cl+ CH3Cl --> CH2Cl + HCl (A chloromethyl free radical is formed)
I hope you can get the gist of it.
Finally, there's termination, which can be the following:
Cl + CH3 --> CH3Cl
Cl + CH2Cl --> CH2Cl2
CH3 + CH3 --> C2H6
CH3 + CH2Cl --> CH3CH2Cl
It's quite simple once you know what initiation, propagation and termination are - you can figure out the equations, rather than memorizing them.
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