CHEM 203 Lecture Notes - Lecture 17: Trigonal Planar Molecular Geometry, Atomic Orbital, Enthalpy
Document Summary
Consequence: processes through which radicals can reacquire a complete lewis octet, such as atom transfer reactions and addition to systems, tend to occur only if hreact < 0. Principle: radicals tend to undergo exothermic ( h < 0) reactions. Note: an extensive tabulation of bond dissociation enthalpies is provided in your book. Thermodynamically favorable transfer of h from h br to an oxygen radical created by dissociation of a peroxide: Thermodynamically favorable addition of br to the system of an olefin a special case of atom-transfer reaction leading to the formation of a carbon radical: C a carbon radical: the lone electron resides in a p-type atomic orbital. The electron-de cient c atom is essentially a trigonal planar sp2 hybrid. Thermodynamically favorable transfer of an h atom from h br to the carbon radical above: Br an alkyl bromide: end-product of the reaction a bromine radical: participates in a second round of the reaction
