Hydrogenation of Alkynes

The video tutorial by Professor Dave explains the process of hydrogenation in organic chemistry, focusing on the conversion of alkynes to alkanes and alkenes. It covers the use of palladium for full hydrogenation, Lindlar's catalyst for producing Z alkenes, and methods involving lithium or sodium for E alkenes. The tutorial emphasizes the stereochemistry involved in these reactions and provides practical examples to illustrate the concepts.

What is the result of hydrogenating an alkyne using Palladium?

• It fully saturates to an alkane.

• It forms a Z alkene.

• It stops at the alkene stage.

• It forms an E alkene.

What is the primary function of Lindler's catalyst in hydrogenation?

• To stop hydrogenation at the alkene stage.

• To convert alkynes to Z alkenes.

• To convert alkynes to E alkenes.

• To fully saturate alkynes to alkanes.

Which stereochemistry does Lindler's catalyst specifically produce?

• E alkene

• Trans alkene

• Z alkene

• Cis alkene

What combination is used to produce E alkenes from alkynes?

• Nickel and hydrogen

• Lithium or sodium with ammonia

• Lindler's catalyst

• Palladium and hydrogen

What is the role of alkali metals like lithium in hydrogenation?

• To convert alkynes to E alkenes.

• To stop hydrogenation at the alkane stage.

• To convert alkynes to Z alkenes.

• To fully saturate alkynes to alkanes.

What is the expected product when hydrogenating a 5-carbon alkyne with Palladium?

• Pentene

• Pentane

• 2-pentene

• 2-pentyne

Which hydrogenation method results in a Z alkene from a 5-carbon alkyne?

• Sodium and ammonia

• Lithium and ammonia

• Lindler's catalyst

• Palladium and hydrogen