CHEM 122 Lecture Notes - Lecture 6: Electrophile, Reaction Rate, Rate Limiting
Document Summary
Chapter 6: reactions of alkenes part i (sec 6. 1-6. 3b) In a reaction the molecule changes. specifically: some bonds break, others form. How it happens is described by the mechanism of reaction. Often, several outcomes are possible in the reaction. the preferences for some outcomes over others is the selectivity of the reaction. The first one: addition of h-x (hydrohalogenation) This particular reaction is general to halogens (cl, br, i): can also work with hbr and hi, Addition of h and halogen to the double bond, hence hydrohalogenation. The 2nd step (cl- addition) is a lewis acid-base reaction. The 1st step can also be viewed as a lewis acid-base reaction, if alkene is represented as its resonance form. Knowledge of reactions lets us predict what compounds would react, and how. Knowledge of the mechanism lets us do even more. such as: Predict how the reaction will be affected by changes.
