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Chapter 9.6: Mechanisms of β-Elimination

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Total cards: 9•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

What is the regiochemistry of a E1 reaction?

Back (Answer)

o Regiochemistry: Zaitsev’s Rule  most substituted alkene

#2
Front (Question)

Describe the mechanism of an E2 reaction

Back (Answer)

 Take a proton away and simultaneously break a bond to give stable molecules or ions

#3
Front (Question)

What is the stereochemistry of an E2 reaction?

Back (Answer)

o Stereochemistry: Determined by antiperiplanar transition state

#4
Front (Question)

Define E2 reaction

Back (Answer)

a bimolecular β-elimination reaction

#5
Front (Question)

Describe the E1 mechanism

Back (Answer)

 Step 1: Break a bond to give stable molecules or ions • Results in carbocation intermediate  Step 2: Take a proton away • Proton transfer from the carbocation intermediate to the solvent gives the alkene

#6
Front (Question)

What is a bimolecular β-elimination reaction?

Back (Answer)

E2 reaction

#7
Front (Question)

What is a unimolecular β-elimination reaction?

Back (Answer)

E1 reaction

#8
Front (Question)

Define E1 reaction

Back (Answer)

a unimolecular β-elimination reaction

#9
Front (Question)

What is the regiochemistry of an E2 reaction?

Back (Answer)

o Regiochemistry: Zaitsev’s Rule  most stable/most substituted alkene