CHEM 1007 Lecture Notes - Methyl Group, Ion, Lone Pair
Document Summary
Resonance the position of the electrons can be drawn in a different place. Atoms don"t move just the position of the bonding electrons because there is a spare p orbital on the carbons. Electrons are delocalized not confined to a single atom or bond. Resonance forms are imaginary: the real structure is a composite. Resonance forms differ only in the placement of electrons and non-bonding electrons: atoms never move place only the double bonds and lone pairs move. Resonance forms must be valid lewis structures: octet rule applies to resonance. Resonance leads to stability: the more resonance structures the more stable. Stability of ions and resonance: look at position of methyl group relative to double bond. This can influence the product from a reaction. Allylic carbocations are more stable than non-allylic carbocations because of resonance. Link between resonance and equilibrium: pka=acid dissociation constant the smaller pka means the stronger acid.
