Alkene reaction and mechanisms

Question 1

What is the reagent used for oxymercuration-demercuration reaction?

Answer 1

1. Hg(OAc)₂, H₂O
2. NaBH₄

Question 2

What is the reagent used for Hydrohalogenation reaction?

Answer 2

H-X

Question 3

What is the reagent used for Acid-catalyzed hydration?

Answer 3

H₃O⁺ or H₂O & Acid Catalyze (usually acid catalyze like [H₂SO₄]

Question 4

What is the reagent used in hydrogenation?

Answer 4

H₂, Pt/ C (or Pd/C, Ni/C)

Question 5

What is the reagents used for Hydroboration - oxidation reaction?

Answer 5

1. BH₃ * THF
2. H₂O₂, NaOH

Question 6

What is the reagents used in the halogenation reaction?

Answer 6

X₂ (Br₂ or Cl₂) or NBS, NCS, NIS

Question 7

What is the reagents used for halohydrin reaction?

Answer 7

X₂ (Br₂ or Cl₂), H₂O Or NBS, H₂O; NCS, H₂O; or NIS, H₂O

Question 8

What are the reagents used for Oxidative cleavage reaction (ozonolysis)?

Answer 8

O₃, Zn, H₂O Or KMnO₄, H₃O⁺

Question 9

What are the Reagents used for Cyclopropanation reaction?

Answer 9

I-CH₂-Zn-I (Simmons-smith reagent) or KOH, CHCl₃

Question 10

What is the mechanism of a Hydrohalogenation reaction?

Answer 10

1. Proton transfer
2. Nucleophilic Attack

Question 11

What is the mechanism of a acid catalyzed hydration reaction?

Answer 11

1. Proton transfer
2. Nucleophilic attack
3. Proton transfer

Question 12

What is the mechanism for halogenation reaction?

Answer 12

1. Double forms a bond with one of the halogens breaking the bond between the halogens
2. Forms a cyclic compound with the halogen
3. The other halogens does a nucleophilic attack and forms by an anti- addition

Question 13

What is the mechanism for a halohydrin reaction?

Answer 13

1. Forms a bond with one of the halogen by breaking the bond between them
2. Forms a cyclic compound with the halogen & the the water attack on an opposite side(front or back) of the halogen
3. Proton transfer

Question 14

What is the mechanism for hydroboration-oxidation reaction?

Answer 14

1. Form a bond with BH₂-H by putting the BH₂ on the least substituted position & H on the more substituted position
2. H₂O₂, NaOH to turn the BH₂ to an OH

Question 15

What is the mechanism for a oxymercuration-demercuration reaction?

Answer 15

1. Form a cyclic ring with Hg(OAc)
2. Water attack the more substituted side of the compound (either from front or back)
3. Proton transfer
4. Then NaBH₄ to turn Hg(OAc) to a H

Question 16

Which is a strong reagent in oxidative cleavage reaction KMnO₄,H₃O⁺or O₃, Zn,H₂O ?

Answer 16

KMnO₄, H₃O⁺

Question 17

When an Alkene that has H at the end of a double is treated with KMnO₄ what happens?

Answer 17

Turn the H into an OH

Question 18

If an Alkene just has one R group (can be anything) & the everything else around the two carbons in an alkene is a Hydrogen and it goes through a oxidative cleavage reaction what are the products?

Answer 18

CO₂ and the cleaved alkene with OH at the end