Ch 7.8 Catalytic Hydrogenation

Catalytic Hydrogenation of Alkenes (metal)

Catalytic Hydrogenation of Alkenes: What is added?

2 H's

Catalytic Hydrogenation of Alkenes: stereoselectivity?

syn

Catalytic Hydrogenation of Alkynes to alkenes

Catalytic Hydrogenation of Alkenes: The metal catalyst can be these four metals

Pd, Pt, Rh, or Ni

Catalytic Hydrogenation of Alkenes: reagents

H₂ and metal catalyst

Catalytic Hydrogenation of Alkynes to alkanes

Catalytic hydrogenation of alkynes, when treated with H₂ and a metal catalyst, reduces to _____

alkanes, adding 4 H's

Catalytic hydrogenation of alkynes when treated with Na or Li and NH₃ (l) -78°C, reduces all the way to _____ with an E configuration.

alkenes, adding 2 H's

Catalytic hydrogenation of alkynes when treated with Na or Li and NH₃ (l) -78°C, reduces all the way to an alkene with an __ configuration.

E (adding H's on opposite sides)

Catalytic hydrogenation of alkynes when treated with H₂ and Lindlar catalyst, reduces all the way to an ____ with a Z configuration.

alkene

Catalytic hydrogenation of alkynes when treated with H₂ and Lindlar catalyst, reduces all the way to an alkene with a __ configuration.

Z (adding H's on the same side, syn)

Catalytic hydrogenation: Treating an alkyne to get a Z-alkene, you use this reagent

H₂, Lindlar catalyst

Catalytic hydrogenation: Treating an alkyne to get a E-alkene, you use this reagent

Na (or Li) / NH₃, -78°C

H₂, Lindlar catalyst on an alkyne will produce a

Z-alkene

Na (or Li) / NH₃, -78°C on an alkyne will produce a

E-alkene