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Questions and Answers
What is required for the b-hydride elimination step in Hech coupling catalysis?
What is required for the b-hydride elimination step in Hech coupling catalysis?
- palladium and hydride must be coplanar (correct)
- a palladium catalyst without hydride
- the addition of a small R group
- a trans-elimination process
Why does the R group tend to eclipse the smallest group on the adjacent carbon during elimination?
Why does the R group tend to eclipse the smallest group on the adjacent carbon during elimination?
- due to electronic reasons
- to facilitate syn addition
- to prevent the formation of a cis double bond
- due to steric reasons (correct)
What type of elimination process occurs in the b-hydride elimination step?
What type of elimination process occurs in the b-hydride elimination step?
- E2 elimination
- syn elimination (correct)
- anti elimination
- radical elimination
What is the predominant type of double bond formed in the product of the elimination?
What is the predominant type of double bond formed in the product of the elimination?
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Which element acts as a catalyst in Hech coupling catalysis?
Which element acts as a catalyst in Hech coupling catalysis?
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Study Notes
Hech Coupling Catalysis
- In the β-hydride elimination step, the palladium and hydride must be coplanar for the reaction to occur, due to the syn elimination process.
- Steric reasons influence the elimination process, causing the R group to tend to eclipse the smallest group on the adjacent carbon.
- As a result, the elimination reaction primarily forms a trans double bond in the product.
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