Hydrogenation

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

How do you control catalytic hydrogenation?

Back (Answer)

Using different metals catalysts

Front (Question)

What do additives do?

Back (Answer)

Adds more selectivity

Front (Question)

What reaction conditions do you need to look at in catalytic hydrogenation?

Back (Answer)

Temperature and pressure

Front (Question)

What type of process is catalytic hydrogenation?

Back (Answer)

Chemoselective

Front (Question)

What are the pros of using H2?

Back (Answer)

There is no waste as you use both H+ Atom efficient Catalytic at 0.00000001 mol%

Front (Question)

What are the cons of LiAlH4/NaBH4?

Back (Answer)

B/Al waste H+/OH pollution released Only use 1/6 atoms

Front (Question)

What is the process of hydrogenation of alkenes?

Back (Answer)

H2 absorbed onto a metal surface Alkene coordinates metal There is a stepwise addition of H2 to the alkene

Front (Question)

What type of addition is hydrogenation of alkenes? What does it depend on?

Back (Answer)

Usually syn-addition Catalyst, conditions and substrate

Front (Question)

What is syn addition?

Back (Answer)

Both hydrogens are on the same face of the molecule

#10

Front (Question)

Why does syn addition take place?

Back (Answer)

Takes place on a surface so it cant rotate for second addition

#11

Front (Question)

What happens to the melting point when alkenes are removed?

Back (Answer)

The melting point decreases

#12

Front (Question)

What type of process is the hydrogenation of alkynes?

Back (Answer)

two step process Alkyne to alkene Alkene to alkane

#13

Front (Question)

In the hydrogenation of alkynes, can you stop at the intermediate Z-alkene?

Back (Answer)

#14

Front (Question)

What are the three components of a lindlar catalyst?

Back (Answer)

Pd CaCO3 Pb(OAc)2

#15

Front (Question)

How is a lindlar catalyst structured?

Back (Answer)

Palladium on calcium carbonate which is then poisoned with Pb(OAc)2

#16

Front (Question)

What is the function of CaCO3 in a lindlar catalyst?

Back (Answer)

Replaces carbon as the support to release the product alkene more easily

#17

Front (Question)

What is the purpose of Pb(OAc)2 in the lindlar catalyst?

Back (Answer)

Poison preventing the over reduction

#18

Front (Question)

What does the lindlar catalyst do?

Back (Answer)

Allows the reaction to stop at the intermediate Z alkene

#19

Front (Question)

If an amine has a hydroxyl group attached too, which group reacts to form the imine? Why?

Back (Answer)

NH2 The lone pair is more available as it is less electronegative, it has a higher pKa

#20

Front (Question)

How is an imine formed?

Back (Answer)

RNH2 + C=O Condensation reaction

#21

Front (Question)

What is formed when an imine goes through a hydrogenation reaction?

Back (Answer)

Amine

#22

Front (Question)

What type of reaction is hydrogenation and why?

Back (Answer)

Chemoselective C=N is a weaker bond than C=O

#23

Front (Question)

When you remove phenyl groups, what does a benzylamine become?

Back (Answer)

Amine

#24

Front (Question)

When you remove phenyl groups, what does a benzylether become?

Back (Answer)

Alcohol