Lecture 03 - Rate and Selectivity in Radical-Chain Reactions. The reactivity-selectivity principle explains why bromine atoms are more selective that chlorine atoms in abstracting hydrogen atoms from carbon.
A free-radical mechanism for adding HBr to alkenes explains its anti-Markovnikov regiospecificity. Careful analysis is required to understand kinetic order for reactions involving catalysts. Termination of radical-chain reactions
can make their rate half-order in the initiator. Selectivity due to protonation of radicals and their reaction partners illustrates the importance of ionic charge in determining reaction rates.
(from oyc.yale.edu)
Lecture 03 - Rate and Selectivity in Radical-Chain Reactions
Time
Lecture Chapters
[00:00:00]
1. The Reactivity-Selectivity Principle
[00:11:11]
2. Radical-Chain Addition of HBr to Alkenes and Its "Regiochemistry"
[00:20:23]
3. Rates of Radical-Chain Halogenation: Rate Laws for Catalytic Cycles