Advices For Studying Organic Chemistry

SUMMARY OF METHODS FOR THE PREPARATION

OF ALKENES AND ALKYNES

3. Debromination of vic-dibromides (Section 7.9)
   General Reaction

CC

Br

Br

CHZn CC + ZnBr^2

3 CO 2 H

4. Hydrogenation of alkynes (Section 7.15)
   General Reaction

RCCR'

H 2 /N

Li or Na

NH 3 or RNH 2

H H

H

H

i 2 B (P-2)

(syn addition)

(anti additon)

CC

R R'

CC

R'

R

(Z)-Alkene

(E)-Alkene

5. Dehydrohalogenation of vic-dibromides (Section 7.15)
   General Reaction

RCCR

H

Br

Br

2 Br−

H

+ 2 NH 2 − RC CR +^2 NH 3 +

(^)