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DAT Organic Chemistry Reaction Summary Sheet Alkene Reactions
Hydrohalogenation
Hydrohalogenation (with Rearrangement)
Halogenation
Hydrobromination with Peroxide
Hydration
Hydration (with Rearrangement)
Bromination in H2O
Oxymercuration-Demurcuration
Hydroboration-Oxidation
Syn-Hydroxylation
Syn-Hydroxylation
Anti-Hydroxylation
Addition of an Alcohol
Bromination in Alcohol
Alkoxymercuration-Demurcuration
Epoxidation
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Catalytic Hydrogenation
Ozonolysis (Reducing Conditions)
Ozonolysis (Oxidizing Conditions)
Oxidative Cleavage
Alkyne Reactions
Catalytic Hydrogenation (Catalytic Reduction)
Reduction to Cis-Alkene Reduction to Trans-Alkene Hydrohalogenation with HBr (Terminal Alkyne)
Hydrohalogenation with HBr (Internal Alkyne)
Halogenation with Br2
Hydration of an Internal Alkyne
Hydration of a Terminal Alkyne (Markovnikov) Hydration of a Terminal Alkyne (Anti-Markovnikov)
SN2 Addition of an Acetylide Ion to an Alkyl Halide
SN2 Addition of an Acetylide Ion to a Ketone
SN2 Addition of an Acetylide Ion to an Epoxide
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Free Radical Halogenation Reactions Free Radical Halogenation using Bromine (more selective)
Free Radical Halogenation using Chlorine (less selective)
Allylic/Benzylic Bromination
Br2
hv or Δ
Br
NBShv or Δor ROOR
Br
NBShv or Δor ROOR
Br
Br
Cl2hv or Δ
Cl
Cl
Cl
Cl
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Grignard Reactions
Addition of a Grignard Reagent to an Aldehyde
2˚Alcohol
Addition of a Grignard Reagent to a Ketone
3˚Alcohol
Addition of a Grignard Reagent to an Ester
3˚Alcohol
Addition of a Grignard Reagent to an Acyl Chloride
3˚Alcohol
Addition of a Grignard Reagent to CO2
Carboxylic Acid
Addition of a Grignard Reagent to an Epoxide (adds to the less subs. side forming the less subs. alcohol)
2˚Alcohol (less subs. alcohol)
Addition of a Grignard Reagent to a Carboxylic Acid
Carboxylate
Addition of a Grignard Reagent to an Amide
Deprotonated Amide
Addition of a Grignard Reagent to a Nitrile
Ketone
MgXOH
O1. , Ether
2. H3O+ O
O
MgX
MgXNH2
O1. , Ether
2. H3O+ NH
O
MgX
1. CO2, Ether
2. H3O+MgX
O
OH
MgX1. , Ether
2. H3O+
OHO
MgX1. , Ether
2. H3O+
O HO
MgXO
O 1. 2 eq. , Ether
2. H3O+
HO
MgXCl
O 1. 2 eq. , Ether
2. H3O+
HO
MgXO1. , Ether
2. H3O+N
MgX1. , Ether
2. H3O+H
O OH
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Electrophilic Aromatic Substitution (EAS) Reactions
Friedel-Crafts Alkylation (Rearrangement Possible)
Friedel-Crafts Acylation (No Rearrangement Possible)
Bromination
Chlorination
Nitration
Sulfonation
Formylation
EAS with an ortho/para-directing group on Benzene
EAS with a meta-directing group on Benzene
ClAlCl3
ClAlCl3
FeCl3
ClCl2
O/P
Substituent
O/P O/PSubstituent
SubstituentM
Substituent
M
Substituent
ClAlCl3
OO
H2SO4
NO2HNO3
AlCl3
CO, HCl
O
H
FeBr3
BrBr2
H2SO4
SO3SO3H
H2SO4/Δ
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Friedel-Crafts Alkylation/Acylation with a meta-directing group or an amine on Benzene
Benzene Side-Chain Reactions
Side-Chain Oxidation of Benzene to form Benzoic Acid
Requires free Hydrogen at Benzylic position
Wolff-Kishner Reduction
Clemmensen Reduction
Zn(Hg), HCl, HeatO
Zn(Hg), HCl, Heat NH2NO2
H2NNH2 or N2H4, -OH, HeatO
M
AlCl3
Cl R
O
R Cl or No Reaction
NH2/NRH/NR2
AlCl3
Cl R
O
R Cl or No Reaction
1. KMnO4, -OH2. H3O+, Heat
O
OH
Na2Cr2O7
H2SO4
orR R
R
or or
1. KMnO4, -OH2. H3O+, Heat
Na2Cr2O7
H2SO4
orNo Reaction
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Hydride Reduction Reactions
Reduction of an Aldehyde to a 1˚Alcohol
Reduction of a Ketone to a 2˚Alcohol
Reduction of a Carboxylic Acid to a 1˚Alcohol
Reduction of an Ester to a 1˚Alcohol
Reduction of an Ester to an Aldehyde
Reduction of an Acyl Chloride to a 1˚Alcohol
Reduction of an Acyl Chloride to an Aldehyde
Reduction of an Amide to an Amine
Hoffmann Rearrangement
Reduction of a Nitrile to an Amine
H
O 1. NaBH4, EtOH
2. H3O+ H
OH
H
O 1. LiAlH4, EtOH
2. H3O+ H
OH
O 1. NaBH4, EtOH
2. H3O+
OH
O 1. LiAlH4, EtOH
2. H3O+
OH
OH
O 1. LiAlH4, EtOH
2. H3O+ H
OH
Cl
O 1. LiAlH4, EtOH
2. H3O+ H
OH
1. LiAlH4, EtOH
2. H3O+NH2N
O
O 1. LiAlH4, EtOH
2. H3O+ H
OH
OH
LiAlH[OC(CH3)3]3O
Cl
O
H
O
O 1. DIBAL-H, -78°C
2. H2O H
O
NH2
O 1. LiAlH4, EtOH
2. H3O+ NH2
NH2
O 1. Br2
2. NaOHNH2
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Alcohol Reactions
Conversion of a 2˚/3˚Alcohol to an alkyl halide via SN1
Conversion of a 1˚/2˚Alcohol to an alkyl bromide via SN2
Conversion of a 1˚/2˚Alcohol to an alkyl chloride via SN2
Conversion of an Alcohol to a Tosylate Ester (OTs)
Retention of Stereochemistry
Acid-catalyzed Dehydration of an Alcohol
Zaitsev’s Rule
Chromic Acid Oxidation of a 1o Alcohol to a Carboxylic Acid
Chromic Acid Oxidation of a 2o Alcohol to a Ketone
Chromic Acid Oxidation of an Aldehyde to a Carboxylic Acid
PCC or DMP Oxidation of a 1o Alcohol to an Aldehyde
PCC or DMP Oxidation of a 2o Alcohol to a Ketone
OH PBr3 Br
OH HX X
OH HX X
OH SOCl2Cl
Pyridine
H
OH PBr3H
Br
H
OH SOCl2H
Cl
Pyridine
OH H3O+
H
OH
OH
O
H2SO4
Na2Cr2O7orCrO3
OH O
H2SO4
Na2Cr2O7orCrO3
H
O
OH
O
H2SO4
Na2Cr2O7orCrO3
OH TsCl OTs
H
OH
H
OPCC or DMP
OH OPCC or DMP
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Ether and Epoxide Reactions
Williamson Ether Synthesis via SN2
Acid-catalyzed Cleavage of Ethers when one side is 2˚/3˚ (Nucleophile attacks more substituted side via SN1)
Acid-catalyzed Cleavage of Ethers when neither side is 2˚/3˚ (Nucleophile attacks less substituted side via SN2)
Acid-catalyzed Ring Opening of Epoxides (Nucleophile attacks more substituted side)
Base-catalyzed Ring Opening of Epoxides (Nucleophile attacks less substituted side)
Aldehyde and Ketone Reactions
Nucleophilic Addition to an Aldehyde or Ketone
Addition of water to an Aldehyde or Ketone forming a Hydrate
Base-catalyzed addition of an Alcohol to an Aldehyde or Ketone forming a Hemi-acetal/Hemi-ketal
Acid-catalyzed addition of an Alcohol to an Aldehyde or Ketone forming a Acetal/Ketal (Protecting Group, reversed by H3O+)
Acid-catalyzed addition of Ethylene Glycol to an Aldehyde or Ketone forming a Acetal/Ketal (Protecting Group, reversed by H3O+)
OHBr
Br HO
O HClOH
Cl
OHBr
Br HO
HBrO OHBr
C or H
O
C or H
HO OO
HO
C or H
O
C or H
HONucleophileH3O+
Nucleophile
C or H
O
H3O+ or -OH
H2OC or H
HO OH
C or H
O
C or H
O O
H3O+
H3O+
HOOH
C or H
O
C or H
O O
HO
H3O+
H3O+
OHNaH, Na, or K Cl
O O
O OCH3HOCH3
OOH
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Addition of a 1˚ Amine to an Aldehyde or Ketone forming an Imine (Reversed by H3O+)
Addition of a 2˚ Amine to an Aldehyde or Ketone forming an Enamine (Reversed by H3O+)
Double bond forms on more substituted end for Ketones
Addition of a Wittig Reagent to an Aldehyde or Ketone
Michael Addition to an α, β Unsaturated Ketone
Michael Addition to an α, β Unsaturated Ketone with a Gilman Reagent (Organocuprates)
C or H
O
C or H
N
H3O+
H2N
H3O+
C or H
O
H3O+
NH
H3O+
C or H
N
C or H
O
C or H
PPh3
O O
O O
or -CN, HNR2, HSR etc.
O
O
O O(CH3CH2CH2)2CuLi
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Alpha Addition/Substitution Reactions
Self Aldol Condensation and Enone Formation
Mixed Aldol Condensation and Enone Formation
Self Claisen Condensation
Mixed Claisen Condensation
Dieckmann Cyclization (Intramolecular Claisen Condensation)
Acetoacetic Ester Synthesis
Malonic Ester Synthesis
H
O-OH, H2O
O OH H3O+, NaOH
Δ
O O
O O -OH, H2OO
HO
H3O+, NaOH
Δ
O
O
O
2O1.
2. H3O+
O O
O
O
OO1.
2. H3O+
O O O
O
O OO1.
2. ClO3.
4. Cl5. H3O+, Δ
O
CO2 HO
O O
O OO1.
2. ClO3.
4. Cl5. H3O+, Δ
HO
O
CO2 2 HO
H
O
2-OH, H2O
H
O OH H3O+, NaOH
Δ H
O
O
2-OH, H2O O OH H3O+, NaOH
Δ
O
O1.
2. H3O+ O
O
O O
O O O
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DAT Organic Chemistry Reaction Details Sheet Rearrangements Details When carbocations form, H’s and CH3’s can do a 1,2-shift to generate a more stable carbocation intermediate 1,2-Hydride Shift
1,2-Methyl Shift
Alkene Reactions Details Hydrohalogenation
What’s added: H+ and Br- Regioselectivity: Markovnikov Stereoselectivity: N/A Intermediate: Carbocation Rearrangement: Possible (methyl and hydride shifts) Mechanism:
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Halogenation
What’s added: 2 Br atoms Regioselectivity: N/A Stereoselectivity: Anti Intermediate: Bromonium ion Rearrangement: Not possible Mechanism:
Hydrobromination with Peroxide
What’s added: H× and Br× Regioselectivity: Anti-Markovnikov Stereoselectivity: N/A Intermediate: Radical Rearrangement: Not possible Mechanism:
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Hydration
What’s added: H+ and OH- Regioselectivity: Markovnikov Stereoselectivity: N/A Intermediate: Carbocation Rearrangement: Possible (methyl and hydride shifts) Mechanism:
Bromination in H2O
What’s added: Br+ and OH- Regioselectivity: Markovnikov Stereoselectivity: Anti Intermediate: Bromonium ion Rearrangement: Not possible Mechanism:
Oxymercuration-Demurcuration
What’s added: H+ and OH- Regioselectivity: Markovnikov Stereoselectivity: Anti Intermediate: Mercurinium ion bridge Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction
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Hydroboration-Oxidation
What’s added: H+ and OH-
Regioselectivity: Anti-Markovnikov Stereoselectivity: Syn Intermediate: Hydroxy-boranes Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Syn-Hydroxylation
or What’s added: 2 OH groups Regioselectivity: N/A Stereoselectivity: Syn Intermediate: N/A Rearrangement: Not possible Mechanism:
Anti-Hydroxylation
What’s added: 2 OH groups Regioselectivity: N/A Stereoselectivity: Anti Intermediate: N/A Rearrangement: Not possible Mechanism: Epoxidation then reaction with aqueous acid or base. In acidic conditions, the H2O attacks the more highly-substituted C:
In basic conditions, H2O attacks the less highly-substituted C:
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Addition of an Alcohol
What’s added: H+ and OR-
Regioselectivity: Markovnikov Stereoselectivity: N/A Intermediate: Carbocation Rearrangement: Possible Mechanism:
Bromination in Alcohol
What’s added: Br+ and OR- Regioselectivity: Markovnikov Stereoselectivity: Anti Intermediate: Bromonium ion Rearrangement: Not possible Mechanism:
Alkoxymercuration-Demurcuration
What’s added: H+ and OCH3
-
Regioselectivity: Markovnikov
Stereoselectivity: Anti Intermediate: Mercurinium ion Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction
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Epoxidation
What’s added: O Regioselectivity: N/A Stereoselectivity: Syn Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Do know that a commonly-used peroxy acid is m-CPBA:
Catalytic Hydrogenation
What’s added: 2 H atoms Regioselectivity: N/A Stereoselectivity: Syn Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Ozonolysis in Reducing Conditions
What’s added: 2 O atoms Regioselectivity: N/A Stereoselectivity: N/A Intermediate: N/A Rearrangement: N/A Mechanism: You do not need to know the mechanism for this reaction Do know that the C=C double bond gets “sawed” in half, and an O atom is placed on the end of each new piece. Note: (CH3)2S is often abbreviated “DMS” for dimethyl sulfide.
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Ozonolysis in Oxidizing Conditions
What’s added: Multiple O atoms Regioselectivity: N/A Stereoselectivity: N/A Intermediate: N/A Rearrangement: N/A Mechanism: You do not need to know the mechanism for this reaction Do know that the C=C double bond gets “sawed” in half, and an O atom is placed on the end of each new piece. Then, one of the H’s attached to the alkene C’s gets replaced by an –OH group.
Oxidative Cleavage
What’s added: Multiple O atoms Regioselectivity: N/A Stereoselectivity: N/A Intermediate: N/A Rearrangement: N/A Mechanism: You do not need to know the mechanism for this reaction Do know that the C=C double bond gets “sawed” in half, and an O atom is placed on the end of each new piece. Then, one of the H’s attached to the alkene C’s gets replaced by an –OH group.
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Alkynes Reactions Details Catalytic Hydrogenation
What’s added: 4 H atoms Regioselectivity: N/A Stereoselectivity: Anti Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Reduction to Cis-Alkene
What’s added: 2 H atoms Regioselectivity: N/A Stereoselectivity: Syn Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Reduction to Trans-Alkene
What’s added: 2 H atoms Regioselectivity: N/A Stereoselectivity: N/A Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Hydrohalogenation with HBr (Terminal Alkyne)
What’s added: 1 H atom and 1 halogen atom (can be F, Br, I, or Cl) per equivalent of HX Regioselectivity: Markovnikov Stereoselectivity: N/A Intermediate: Carbocation Rearrangement: Possible Mechanism: The halogen goes to the C with fewer H’s
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Hydrohalogenation with HBr (Internal Alkyne)
What’s added: 1 H atom and 1 halogen atom (can be Cl or Br) per equivalent of HX Regioselectivity: Markovnikov Stereoselectivity: N/A Intermediate: Carbocation Rearrangement: Possible Mechanism: Same as for terminal alkynes, but yields a mixture of two products because both intermediates are equally stable Halogenation with Br2
What’s added: 2 halogen atoms (can be F, Br, I, or Cl) Regioselectivity: N/A Stereoselectivity: Anti Intermediate: Bromonium ion Rearrangement: Not possible Mechanism:
Hydration of an Internal Alkyne
What’s added: 1 O atoms Regioselectivity: N/A Stereoselectivity: N/A Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Do know that this reaction produces enols, which then tautomerize to form ketones.
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Hydration of a Terminal Alkyne (Markovnikov)
What’s added: 1 O atom Regioselectivity: Markovnikov Stereoselectivity: N/A Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Do know that this reaction produces Markovnikov enols, which then tautomerize to form ketones.
Hydration of a Terminal Alkyne (Anti-Markovnikov)
What’s added: 1 O atom Regioselectivity: Anti-Markovnikov Stereoselectivity: N/A Intermediate: N/A Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Do know that this reaction produces Anti-Markovnikov enols, which then tautomerize to form aldehydes.
SN2 Addition of an Acetylide Ion to an Alkyl Halide
What’s added: additional C atoms (-R of alkyl halide) Regioselectivity: N/A Stereoselectivity: N/A Intermediate: Acetylide Ion Rearrangement: Not possible Mechanism: Deprotonation, then alkylation via SN2 reaction
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SN2 Addition of an Acetylide Ion to a Ketone
What’s added: 2 additional alkyl groups and 1 –OH group Regioselectivity: N/A Stereoselectivity: N/A Intermediate: Acetylide Ion Rearrangement: Not possible Mechanism: Deprotonation, then addition of a ketone via SN2 reaction
SN2 Addition of an Acetylide Ion to an Epoxide
What’s added: 2-hydroxylpropane (from epoxide) Regioselectivity: N/A Stereoselectivity: N/A Intermediate: Acetylide Ion Rearrangement: Not possible Mechanism: Deprotonation, then addition of 2-hydroxyl propane via SN2 reaction
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Free Radical Halogenation Reaction Details Free Radical Halogenation using Bromine (more selective)
What’s added: 1 Br atom Regioselectivity: Most Substituted Product Stereoselectivity: N/A Intermediate: Radical Intermediate Rearrangement: Not possible Mechanism: Formation of bromine and carbon radicals and them joining to create an alkyl halide 1. Initiation
2. Propagation
3. Termination
Br Br hv or ΔBr Br
Br Br Br Br
Br2
hv or Δ
Br
H
BrHBr
Br BrBr
Br
alkyl halide
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Free Radical Halogenation using Chlorine (less selective)
What’s added: 1 Cl atom Regioselectivity: N/A Stereoselectivity: N/A Intermediate: Radical Intermediate Rearrangement: Not possible Mechanism: Formation of chlorine and carbon radicals and them joining to create alkyl halides 1. Initiation
2. Propagation
3. Termination
Cl2hv or Δ
Cl
Cl
Cl
Cl
Cl Cl hv or ΔCl Cl
ClHCl
Cl Cl Cl
alkyl halide
H
Cl
Cl HCl
Cl ClCl
alkyl halide
Cl
H
Cl Cl Cl Cl
H
ClHCl
Cl ClCl
Cl
alkyl halide
Cl HCl
Cl ClCl
alkyl halideCl
H
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Allylic/Benzylic Bromination
What’s added: 1 Br atom Regioselectivity: N/A Stereoselectivity: N/A Intermediate: Allylic Radical Intermediate Rearrangement: Not possible Mechanism: You do not need to know the mechanism for this reaction Note: this reaction results in the formation of allylic radical intermediates which resonate and thus allow for the formation of multiple products.
NBShv or Δor ROOR
Br
NBShv or Δor ROOR
Br
Br
NBShv or Δor ROOR
BrBr
allylic radical intermediatesBr
Br