Advices For Studying Organic Chemistry

MeH CCMeH

C H

Br

Me

H C

Br

Me

Br −

CC

Br

MeH MeH

Me

C

Br

H

C

Me

Br

H

CC

Br

MeH HMe

anti-addition

+

trans-2-butene

+

Br Br

3. When bromine adds to cis-2-butene, the product is a racemic form of
   2
   ( R,3R)-2,3-dibromobutane and (2S,3S)-2,3-dibromobutane.

Reaction 2

C

H 3 CH

C

Br H

CH 3 CH 3

Br 2

C

H 3 CH

CCl 4 C + C

H CHBr

3

C

H Br

Br CHH

3

cis-2-Butene (2S,3R)( 2 S,3S)

cis-2-butene

He CCMeH

Me Me Br

M

C MeH

Br −

H C

Br

Me

C

Me

Br

H

CC

Br

MeH HMe

ant

Br

C

MeH

CC

Br

H H

+

i-addition

+

+

Br

Br