CHAPT 6.1: electrophilic addition Flashcards Preview

CHEM III organic chemistry > CHAPT 6.1: electrophilic addition > Flashcards

Flashcards in CHAPT 6.1: electrophilic addition Deck (8)
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1

why are alkanes inert

they have stronger, less accessible electrons that are sheltered in sigma bond between nuclei.
All the valence electrons are tied up in strong, non-polar C-C and C-H bond

2

why are alkenes and alkynes more reactive

they are more electron rich and the electron in pi bond are weaker and more accessible .

3

Electrophilic addition types

addition of halogens in non aq solutions
addition of halogens in aq solutions
addition of Hydrogenl halides
addition of water w acid catalyst

4

intermediate and products

Br2/CCl4: bromonium ion ; 1.2-dihalidealkane
Br2/H2O: bromonium ion, hydronium/oxonium ; bromohydrin product
HBr: carbocation ; alkyl halide
H2O/H+: carbocation, oxonium or hydronium; alcohol product

5

Br2/CCl4

nuchelophillic attack from the side opposite to the carbon-bromide bond so that trans isomers are exclusively formed

6

Alkene with Br2/H2O

with unsymmetrical alkene , the preferred product is halogen is on less substituted carbon
H2O will attack more substituted carbon

7

HBr

follows Markonikov's rule ( rich becomes richer)
- rearrangement is possible

8

H2O/H+

follows Markonikov's rule ( rich becomes richer)
- rearrangement is possible