ALKYNES

Reactions of Alkynes

1. Deprotonation of acetylenes to give acetylide ions

2. SN2 of acetylide ions with alkyl halides

3. Hydroboration of alkynes to give aldehydes

4. Partial reduction of alkynes with Lindlar’s catalyst to give cis-alkenes

5. Partial reduction of alkynes with Na/NH3 to give trans-alkenes

6. Oxymercuration of alkynes with water and mercury to give ketones

7. Addition of hydrochloric acid (HCl) to alkynes (once) to give alkenyl chlorides

8. Addition of hydrochloric acid to alkynes (twice!) to give geminal dichlorides.

9. Addition of hydrobromic acid (HBr) to alkynes (once) to give alkenyl bromides

10. Addition of hydrobromic acid (HBr) to alkynes (twice) to give geminal dibromides.

11. Addition of hydroiodic acid (HI) to alkynes (once) to give alkenyl iodides

12. Addition of hydroiodic acid (HI) to alkynes (twice) to give geminal diiodides

13. Catalytic hydrogenation of alkynes with Pd/C to give alkanes

14. Oxidative cleavage of alkynes with ozone to give carboxylic acids

15. Oxidative cleavage of alkynes with KMnO4 to give carboxylic acids

16. Formation of alkynes from elimination of dibromides using NaNH2.

 

123.202 Lecture 11 - alkynes






-- 
ANTHONY MELVIN CRASTO
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