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Slide 1

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Mechanism
n e For
h e
Et Br 2 Electrophilic
w i th
Addition…read more

Slide 2

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=
ETHENE!
H H
C C
H H
· The double bond of an alkene consists of two pi-bonds and one
sigma bond.
· The pi-bonds on either side of the sigma bond give the alkene areas
of high electron density.…read more

Slide 3

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Br2!
Br Br
· In this reaction, the Br2 will become an electrophile and a dipole.
· It will also undergo hetrolytic fission.…read more

Slide 4

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The Br2 molecule comes near the ethene
molecule.
· As it comes nearer to the region of high
electron density, the shared pair of
electrons in the Br2 bond are repelled to
--- one side.
· This causes one Br atom to become
-- slightly positively charged, and the other
slightly negatively charged.
· The bromine is now an electrophile.
· The Br2 bond will then break (hetrolytic
fission).
+
--
-…read more

Slide 5

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CARBOCATION
H H
· The electron pair in the pi-bond is
C C+ attracted to the slightly positive
(+) Br, causing the double bond to
H H break.
· The broken bond joins the carbon to
the (+) Br.
· When the bond breaks, the carbon
ION atom (to which the bromine hasn't
joined) is left with a positive charge.
· You are left with a...
· And an...…read more

Slide 6

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H H
C C+ · The bromine ion is attracted to the
positively charged carbon atom
H H that is left
· A bond forms between the Br and
C, leaving you with...
1,2-dibromoethane…read more

Slide 7

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