Free Radical Reaction and It's Type

Megha Palariya

1. S.P.C. Govt. College Ajmer. 2021-2022 M.Sc. Chemistry Sem. 1 st Student’s Name – Megha Palariya Organic Chemistry Seminar

2. TOPIC- Free Radical Reaction And It’s Type

3. Content~ Free Radical Introduction Types Of Free Radical Reaction Recombination Disproportionation Reaction With Olefin Reaction With Iodine And Metal Rearrangements

4. Introduction When A Covalent Bond Undergoes Homolytic fission, The Two Departing Atoms Take One Electron Of The Binding Pair Of Electrons. The Two Fragments Produced Carry An Odd Electron Each And Are Called Free Radicals.

5. Reactions For Free Radicals

6. Recombination Reaction The Free Alkyl Radicals May Recombine To Form Hydrocarbons. Note- The Reaction Is Used In The Termination Step In The Free Radical Polymerization For The Production Of Polymers.

7. Disproportionation Reaction At Higher Temperature The Alkyl Radical May Undergo Disproportionation. The Ethyl Radical Disproportionates (i.e. One radical takes Up hydrogen from Another free radical) Note- It Is Found That Coupling Takes Place With Unbranched Free Radicals While Disproportionation Predominates With Brached Radicals.

8. Reaction With Olefines The Alkyl Radicals Reacts With Olefins To Form A New Free Radical. The Newly Formed Free Radical Further Add On The Another Molecules Of Olefin. Note- The Above Reaction Is Used As The Propagation Step In The Polymerization Of Ethylene.

9. Reactions With Iodine And Metals- The Alkyl Radicals May Combine With Iodine or Other Elements To Form Alkyl Derivatives.

10. Rearrangements Like Carbanions,the Free radicals undergo rearrangements Involving 1,2-Shifts of aryl group via bridgehead intermediate.Thus, the Aldehyde 1). Undergoes H-abstration from the CHO group by Me3CO To yield the acyl radical. 2).Which loses CO to form the Radical. 3). The Rearrangement Involves the Migration of Ph via The bridged ion intermediate

11. Reference Book Reaction Mechanism And Reaganets In Organic Chemistry- By Dr. G.R. Chatwal {Himalaya Publishing House} Reactive Intermediates in Organic Chemistry: Structure, Mechanism, and Reactions- By Maya Shankar Singh Advanced Organic Chemistry- By Dr. Jagdamba Singh, Dr. L.D.S. Yadav {A Pragati Edition}

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