Alkene Reactions

Question 1

Hydrogenation (H2/Pt)

Answer 1

Syn addition
H2/Pt reacts with a double or triple bond to make a single bond

Can also be used to turn =O into OH with another H on other side.

Question 2

Bromination (Br2)

Answer 2

Anti-addition

Br2 reacts with a molecule with a double bond adding two Brs the double bond flips out.

Question 3

McPBA

Answer 3

Makes opoxi ring

Question 4

Hydrohalogenation (Hx)

Answer 4

Markovinkov
HX
A halogen reacts with a dohble bond causing it to flip out and add a halogen (X) to the end

Question 5

Anti-markiuvnikov (Hx/ROOR)

Answer 5

HX/ROOR (such as H2O2)

Same as hydrohalogenation but X added to other side

Question 6

Dihydroxylation (KMnO4/0c/wu)(McPBA/H30)(OsO4)

Answer 6

== + KMnO4/0c/ wu—> OH—OH
Also works with McPBA/H3O
And OsO4

Question 7

Oxidative cleavage (KMnO4/hot)

Answer 7

KMnO4/hot

A carboxilic acid is added where double bond used to be

Question 8

Ozonolysis (O3/Me2S)

Answer 8

Breaking with ozone
O3/Me2S
Breaks double bond into two with ketone on ends

Question 9

Halohydrogen formation (Br2/H2O)

Answer 9

Br2/H2O

Uses double bond to form OH and Br

Question 10

Oxymercuration (Hg(OAc)2/H2O)(NaBH4)

Answer 10

Hg(OAc)2/H2O NaBH4

Get rid of double bond and adds OH to vinilic carbon

Question 11

What happens when you react a molecule with BH3 and then H2O2/OH

Answer 11

Double bond flips out and has BH2 on one side and H on other. Then BH2 comes off and is replaced with OH

Question 12

Acid catalized reaction (H3O) (H2SO4/H2O)

Answer 12

H3O (off vinylic) or H2SO4/H2O (off anylic) can be used to flip out doubke bond and make OH

Question 13

H- and Wu

Answer 13

Turns =O into OH with another H on other side

Question 14

H+/triangle

Answer 14

Turns OH back into alkene

Question 15

HNO3/H2SO4

Answer 15

Adds a NO2