Alkenes:Electrophilic addition and carbocation rearrangement (McM 6.12) Alkenes: Hg-mediated addition of water or alcohols (McM 7.4, 18.4) Alkynes: Hg-mediated.

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Presentation transcript:

Alkenes:Electrophilic addition and carbocation rearrangement (McM 6.12) Alkenes: Hg-mediated addition of water or alcohols (McM 7.4, 18.4) Alkynes: Hg-mediated addition of water (McM 8.5) Alkynes: Oxidative cleavage (McM 8.7) Alkenes: Reactions with carbenes (McM 7.6) Alkenes: Addition of radicals (McM 7.10)

Cation Rearrangement 1,2 Hydride shift Hydride shift Alkyl group shift

Carbenes McM chapt 7.6, lab ex. 7 Neutral Divalent 6 valence electrons - Highly reactive Electron deficient /electrophilic properties

electron pair, opposite spin cation / anion properties diradical properties Gives triplet signal in esr spektrum Triplet normally somewhat more stable than singlet Singlets more reactive

prod. from triplet prod. from singlet high energy barrier triplet - prod.

Polymerization of alkenes (McM 7.10) Radical polymerization Cationic polymerization Conformation of polymer - Properties Polymers - Synthetic macromolecules linear polymer crystalline solid Amorphous solid Both linear and amorph areas hardness - drawn to fibers elasticity

stereochemistry

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