November 19 - Alkene Reactivity

Question 1

1,2-hydride shift

Answer 1

When a hydride ion moves from one carbon to an adjacent carbon

An H- hydride ion is negatively charged because it has gained an extra electron (whereas H+ has lost it)

Question 2

Hydration

Answer 2

The addition of water to a molecule

Question 3

How is a racemic mixture formed?

Answer 3

When a reactant with no asymmetric centers reacts forming a product with one asymmetric center, the resulting mixture will always be racemic

Question 3

Where will the hydrogen go in a terminal alkyne electrophilic addition reaction?

Answer 3

The hydrogen from the nucleophile will bond to the sp carbon that is bonded to the hydrogen

6.13 p.204

Question 4

Enol

Answer 4

C=C bond with an OH group bonded to one of the sp2 carbons

Question 5

What happens when you add water to an alkyne?

Answer 5

Produces an enol, which then rearranges into a ketone

The first reaction is catalyzed by an acid

6.14 p. 205

Question 6

Keto-enol tautomers

Answer 6

A ketone and its corresponding enol

6.14 p. 206

Question 7

Tautomers

Answer 7

Constitutional isomers that are in rapid equilibrium

Question 8

Enol interconversion/tautomerization

Answer 8

Interconversion of tautomers