CHEM 212 Lecture Notes - Lecture 8: Electrophilic Addition, Syn And Anti Addition, Sigma Bond

• School: McGill University
• Department: Chemistry
• Course: CHEM 212
• Professor: Jean- Philip Lumb

Document Summary

Addiion: 2 molecules become 1 reagent adds to substrate, characterisic rxn for unsaturated compounds. Structure of ethane: pi-bond above and below c-c sigma bond axis (keep p-nodal plane, unpaired e- from p2 . Previous example of addiion: hydrogenaion the addiion of h to an unsat compound, special hydrogenaion from alkyne to alkene. Li or na in nh3 or etnh2 trans/e(ani addiion) alkene. Electrophilic addiion: addiion of strong acids hx (similar to sn1) W/ displacement of lg which then atacks adj c: mechanism, reacion coordinate, orbital. Either side atack c=c -> h+ l/r| x- -> c+ l/r ; r/s mixture. When addiion to asymmetrical alkenes happen, where does of each of. H-x go: markovnikov"s rule in the addiion of h-x to c=c, the h (or e+) adds to the c with the most h"s already to make the most stable carbocaion. Rearrangement: unstable carbocaions can rearrange to be more stalble, 1,2-me or hydride shit (migrates with its electron pairs, original site.