9.4 Reduction of Alkynes | Organic Chemistry

In this lesson Chad covers the the three common reduction reactions for alkynes. He begins with a review of the catalytic hydrogenation of alkenes to form alkanes and then shows the analogous catalytic hydrogenation of alkynes to form alkanes. He proceeds to show that by using a poisoned catalyst such as Lindlar's catalyst catalytic hydrogenation of an alkyne results in a cis-alkene. Finally, Chad shows how dissolving metal reduction (Na / NH3) can be used to reduce an alkyne to a trans-alkene. He includes the dissolving metal reduction mechanism and shows why this mechanism results in a trans-alkene.

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00:00 Lesson Introduction
00:36 Review of Catalytic Hydrogenation of Alkenes
01:42 Catalytic Hydrogenation of Alkynes
02:14 Catalytic Hydrogenation of Alkynes with Lindlar's Catalyst
04:31 Dissolving Metal Reduction of Alkynes (Na / NH3)
05:47 The Dissolving Metal Reduction Mechanism

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