CHEM 211 Lecture Notes - Lecture 34: Chain Termination, Neopentane, Covalent Bond
8 Dec 2016
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What we will cover: radicals, their reactivity, and their formation, radical-based reactions. When the electrons of a bond both go in one direction towards one element to break the bond: creates one positive and one negative ion, uses double headed arrow, homolysis. When the electrons of a bond is split evenly between the two parts of the bond, breaking the bond: creates two radicals, uses single headed arrow. Radical = element with a single electron present (not a single electron pair!) Homolysis of covalent bonds: needs heat or uv light. Ex. peroxide plus heat breaks and forms two radicals. Cl2 + uv light forms two cl radicals. Reactions of radicals: almost all are short lived, highly reactive, when radicals react with neutral (normal?) molecule, you end up with a neutral and a radical. There is no way to make up an extra electron. Unpaired in reactants, unpaired in products: can react with alkane and alkenes.
