Chapter17醛和酮
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Transcript of Chapter17醛和酮
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Chapter 17: Chapter 17: Aldehydes and KetonesAldehydes and Ketones
R H
O
Functional Group: CarbonylFunctional Group: Carbonyl
Aldehyde: RCHO,Aldehyde: RCHO,
Ketone: Ketone: RCOR’, RCOR’,
R R'
O
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Some 300 million sperm are released by the male during ejaculation, while the female usually produces one large egg at a time. Only one sperm cell can fertilize the egg. How does it find it?
Magnification: ~2,500
Sperm are selected for fertilization by their ability to “smell” a nearby egg. The 11-carbon aldehyde bourgeonal, above, activates this ability, whereas the straight-chain 11-carbon aldehyde, undecanal, shuts it down.
A little aldehyde at a A little aldehyde at a crucial moment.......crucial moment.......
O
H
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NomenclatureNomenclature
The carbonyl group of aldehydes and ketones The carbonyl group of aldehydes and ketones has has priority priority over all other polar or functional over all other polar or functional groups used so far, namely groups used so far, namely
RX, ROH, , ,RX, ROH, , , (But not COOH)(But not COOH)
>>In addition:In addition:
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Systematic Naming Systematic Naming (IUPAC)(IUPAC)
AldehydesAldehydes
AlkanAlkanee Alkan Alkanalal. Longest chain . Longest chain starts at carbonyl carbon, which is starts at carbonyl carbon, which is C1.C1.ExamplesExamples::
FormFormaldehydealdehyde AcetAcetaldehydealdehyde
IUPAC-accepted common namesIUPAC-accepted common names
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Cyclic aldehydes have the endingCyclic aldehydes have the ending-carbaldehyde -carbaldehyde after cycloalkane after cycloalkane name.name.The carbon attached to -CHO is C1.The carbon attached to -CHO is C1.Examples:Examples:
TheThe unit as a substituent is calledunit as a substituent is calledformylformyl..
Cis-2-Cis-2-mercaptomercaptocyclo-cyclo-hexanehexanecarbaldehydcarbaldehydee
CHO
12
34
SH
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KetonesKetones
AlkAlkaneane Alkan Alkanone. one. Longest chain Longest chain incorporates carbonyl carbon and is incorporates carbonyl carbon and is
numbered from terminus close numbered from terminus close to C=O.to C=O.
Cyclic ketones are Cyclic ketones are cycloalkanones; cycloalkanones; CC=O is =O is C1C1..Examples:Examples:
CisCis-2-ethenyl-3--2-ethenyl-3-methylcyclohexanonmethylcyclohexanone (if racemic) or e (if racemic) or 22SS,3,3S-.S-.
2-Pentanone
O
H
H
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An aldehyde containing a An aldehyde containing a ketone C=O is called an ketone C=O is called an oxooxoalkanal.alkanal.Example:Example:
Substituent name: Substituent name: alkanoylalkanoyl
O
R
O
CH3acetylacetyl, but , but propanoylpropanoyl
(IUPAC accepted common name)(IUPAC accepted common name)
O
CH3CH2
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O
O
HO
Complex Aldehydes and Complex Aldehydes and KetonesKetones
4-Acetylbenzenecarboxylic acid4-Acetylbenzenecarboxylic acid
Br
O
H
O
TransTrans-4-bromo-2-oxo-3-butenal-4-bromo-2-oxo-3-butenal
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Structure Structure
OrbitalsOrbitals
The carbonyl group contains a The carbonyl group contains a shortshort, , strongstrong, and very , and very polarpolar bond.bond.
ResonanceResonance
PolarizationPolarization
Molecular structureMolecular structure
EPMEPM
175 kcal mol-1
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Polarization affects the physical Polarization affects the physical constants of aldehydes and constants of aldehydes and
ketonesketones-- Boiling points relatively high-- Boiling points relatively high-- Smaller members (acetaldehyde, -- Smaller members (acetaldehyde, acetone) are completely miscible with acetone) are completely miscible with waterwater
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11H NMR: Carbonyl group is H NMR: Carbonyl group is deshieldingdeshielding
Uniquely Uniquely deshieldeddeshielded by polarization and by polarization and double bond effectdouble bond effect
J ~ 2Hz
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1313C NMRC NMR
R R'
O
~ 200 ppm~ 200 ppm
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IRIR υυC OC O~~
---- = 1690-1750 cm= 1690-1750 cm-1-1
Conjugation reduces , strain increases itConjugation reduces , strain increases itυυCOCO~~
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H3C CH3
O
H
11H NMRH NMR 1313C NMRC NMR
IRIR
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UVUV
The The ππππ* and n* and nππ* * transitions in acetonetransitions in acetone
λλmaxmax (n(nππ*)*) = 275-295 nm= 275-295 nm
Lone Lone electron electron pairspairs
:: ::
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Synthesis Synthesis (A review of Chapter 8)(A review of Chapter 8)
1.1.OxidationOxidation of of AlcoholsAlcoholsPrimary Primary aldehydes aldehydes Secondary Secondary ketones ketonesUse Use chromium(VI)chromium(VI) reagents reagents Selective: Will not oxidize alkene or Selective: Will not oxidize alkene or alkyne units. Especially mild is PCC:alkyne units. Especially mild is PCC:
PyridinePyridinePyridinium chlorochromate :Pyridinium chlorochromate : “PCC” “PCC”
NNH H ++
NNCrOCrO33ClCl
--
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Avoid water: Causes Avoid water: Causes overoxidationoveroxidation of primary of primary alcoholsalcohols
ExamplesExamples::
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2.2.AllylicAllylic Oxidation: Oxidation: MnOMnO22
Selective: Will not attack ordinary alcoholsSelective: Will not attack ordinary alcohols
Allylic H is reactiveAllylic H is reactive
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3. 3. Ozonolysis Ozonolysis ofof alkenes: alkenes: OO33, then reducing agent, then reducing agent
Oxidative cleavage of carbon-carbon double Oxidative cleavage of carbon-carbon double bondsbonds
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4. 4. HydrationHydration of alkynes of alkynesHydration of the carbon–carbon triple bond Hydration of the carbon–carbon triple bond yields enols that tautomerize to carbonyl yields enols that tautomerize to carbonyl compoundscompoundsMarkovnikovMarkovnikov: Use Hg: Use Hg2+2+, H, H22O, O, HH++::
Anti-MarkovnikovAnti-Markovnikov: Use hydroboration-: Use hydroboration-oxidationoxidation
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5. 5. Friedel-CraftsFriedel-Crafts alkanoylation alkanoylation ((Electrophilic Aromatic Substitution)Electrophilic Aromatic Substitution)
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ReactionsReactions
E.g., NaBH4, RLi, RMgX
(H+)
There are three regions of reactivity There are three regions of reactivity in aldehydes and ketonesin aldehydes and ketones
ReviewReview
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Nucleophilic additions to carbonyls Nucleophilic additions to carbonyls to give alcoholsto give alcohols
Addition reactions occur with Addition reactions occur with milder nucleophilesmilder nucleophiles, , such as water, alcohols, amines, etc. To speed them such as water, alcohols, amines, etc. To speed them up, up, acid or base catalysisacid or base catalysis is required. is required.
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Catalyzed Ionic Catalyzed Ionic AdditionsAdditions
Base CatalyzedBase Catalyzed Mechanisms: Mechanisms:
Acid CatalyzedAcid Catalyzed Mechanisms:Mechanisms:
X―Y = H―Nu
X―Y = H―Nu
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1. 1. Hydration:Hydration: Geminal Geminal Diols Diols (Carbonyl Hydrates)(Carbonyl Hydrates)
KK ~ 1 ~ 1
KK depends on “unhappiness” of C=O depends on “unhappiness” of C=O polarization: Electron-withdrawing polarization: Electron-withdrawing substituents activate, donors substituents activate, donors deactivate.deactivate.
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Mechanisms:Mechanisms:
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ΔΔH H ° = ° = -3.09-3.09 kcal mol kcal mol-1-1, , ΔΔS S ° = ° = -22.9-22.9 eu, eu, ΔΔG G ° = ° = +3.74+3.74 kcal mol kcal mol-1-1
ΔΔH H ° = ° = -5.30-5.30 kcal mol kcal mol-1-1, , ΔΔS S ° = ° = -17.2-17.2 eu, eu, ΔΔG G ° = ° = -0.18-0.18 kcal mol kcal mol-1-1
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2. Addition of 2. Addition of AlcoholsAlcohols
(Not (Not hemiketal: hemiketal: IUPAC)IUPAC)
Same as water, initially, to form Same as water, initially, to form hemiacetalshemiacetals
K
K
K varies from < 1 to > 1, as with water. Depends on R.
H+ or HO-
H+ or HO-
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IntramolecularIntramolecular variant variant (important for (important for sugars, Chapter 24): sugars, Chapter 24): Best for 5- and Best for 5- and
6-membered rings.6-membered rings.
Favored by entropyFavored by entropy relative relative to intermolecular addition; to intermolecular addition;
ΔΔG G ° = ° = ΔΔH H ° - T° - TΔΔS S °°
ΔΔS S ° is ° is less negativeless negative for for intramolecular reaction.intramolecular reaction.
K >1!
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We can drive the hemiacetal step We can drive the hemiacetal step furtherfurther with with more alcohol and with more alcohol and with HH++ catalysis: catalysis:
AcetalsAcetals
Acetals are stable to: Acetals are stable to: Base Base Oxidizing agents Oxidizing agents Nucleophiles (Grignards, Nucleophiles (Grignards,
alkyllithiums, hydrides)alkyllithiums, hydrides)
Acetals are Acetals are NOT NOT stable to: stable to: AcidAcid
(A geminal diether)(A geminal diether)
K >1!
(isolated)
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Mechanism:Mechanism:
AcetalAcetal
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Cyclic Acetals: Cyclic Acetals: Protecting Protecting GroupsGroups
o
o
CHCH33OHOH
IntramolecularIntramolecular variant variant (important for (important for sugars, Chapter 24). sugars, Chapter 24). Best for 5- and 6-Best for 5- and 6-membered rings.membered rings.
HO
O
H
H+, H2O
Hydrolysis = Deprotection
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O
OH
O
Br
1.1. HOOH
2. 2. MgMg
3.3.
4. 4. HH++, H, H22OO
O
H
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This is also a method to This is also a method to protect diols:protect diols:
OBr
OH
OH
+H+
Br
O
O
Mg
BrMg
O
O
O H+
OH
OH
HO
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Thioacetals: Stable to Thioacetals: Stable to acid! acid!
Application of Application of thioacetals: thioacetals: DesulfurizationDesulfurization
Deprotection:Deprotection:
Thioacetalization uses Lewis acid catalysis, e.g., ZnClThioacetalization uses Lewis acid catalysis, e.g., ZnCl22. Again, . Again, cyclic version particularly favorable.cyclic version particularly favorable.
More applications: Chapter 23.More applications: Chapter 23.
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3. 3. Amine AdditionsAmine Additions
Example:Example:
Ammonia and primary Ammonia and primary aminesamines add to the add to the carbonyl function and then carbonyl function and then dehydrate: A dehydrate: A ““condensationcondensation” reaction.” reaction.
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Mechanism:Mechanism:
Hemiaminal Hemiaminal DehydrationDehydration
Imine FormationImine Formation
A condensation A condensation product (-Hproduct (-H22O)O)
LipshutzLipshutz
BBoysBBoys
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IntramolecularIntramolecular reaction: reaction: Best for 5- Best for 5- and 6-membered rings.and 6-membered rings.
ONH2 N
Cat. Cat. HH++
Teaser: An Teaser: An 11H NMR H NMR spectrum of an spectrum of an imine (downfield imine (downfield region)region)
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Special IminesSpecial Imines
+ H+ H22N-OHN-OH(as H(as H33NN++-OH -OH ClCl--))
An An oximeoxime
++
SemicarbazidSemicarbazidee
SemicarbazonSemicarbazonee
R R'
O
R R'
NOH
-H-H22OO
R R'
O
NH
NH2
O
H2N
R R'
N
HN
O
NH2
-H-H22OO
R R'
O
++ -H-H22OO
HydrazoneHydrazone
HydroxylaminHydroxylaminee
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Reaction of the carbonyl function Reaction of the carbonyl function with with secondary aminessecondary amines gives gives hemiaminals in which normal hemiaminals in which normal condensation is not possible: No H condensation is not possible: No H left on N. Therefore, water loss left on N. Therefore, water loss occurs to the “carbon side” to form occurs to the “carbon side” to form an an enamineenamine..
Enamine Enamine FormationFormation
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Mechanism:Mechanism:
Enamines are useful, can be alkylated (Chapter Enamines are useful, can be alkylated (Chapter 18-4).18-4).
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Wolff-Kishner Reduction Wolff-Kishner Reduction An Application of An Application of HydrazonesHydrazones
Synthesis of a Synthesis of a HydrazoneHydrazone
Wolff-Kishner ReductionWolff-Kishner Reduction
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Mechanism:Mechanism: Nitrogen elimination Nitrogen elimination
In practice, the reaction is carried out without isolating the intermediate hydrazone.
A diazaallylic anion
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Use in alkylbenzene synthesis:Use in alkylbenzene synthesis:
Br
Br
Br
Br
The Wolff-Kishner reduction is an alternative to The Wolff-Kishner reduction is an alternative to the Clemmensen (rough, conc. acid) and thioacetal desulfurization methods (incompatible with cat. H2- sensitive groups) of deoxygenating aldehydes and ketones.
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4. Addition of 4. Addition of Non-Non-organometallic organometallic Carbon Carbon
NucleophilesNucleophilesa. Cyanide makes a. Cyanide makes cyanohydrinscyanohydrins
To make HCN,but keep pH slightly basic
MechanismMechanism
NaNaOHOH
Usefulness: A C-C bond formation and -CN is a versatile functional Usefulness: A C-C bond formation and -CN is a versatile functional groupgroup
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b. The b. The Wittig ReactionWittig Reaction
Phosphonium salt Phosphonium salt synthesissynthesis
Georg Wittig (1897–1987) NP 1979
Discovered during an investigation of Discovered during an investigation of SSNN2 reactions of phosphines with 2 reactions of phosphines with haloalkanes.haloalkanes.
The charge on P The charge on P acidifies the adjacent acidifies the adjacent C-H: Deprotonation C-H: Deprotonation gives a so-called gives a so-called ylideylide
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Other (weaker) bases OK, such as CHOther (weaker) bases OK, such as CH33OO--, CH, CH33OH, generate the OH, generate the ylide in equilibrium concentrations sufficient for the next step: ylide in equilibrium concentrations sufficient for the next step: Attack on carbonyl carbon and formation of alkenes.Attack on carbonyl carbon and formation of alkenes.
NucleophilicNucleophilic Valence shell Valence shell expandedexpanded
WittigWittig
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Driving force: Very strong Driving force: Very strong bondbond
CompareCompare::
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CHCH22=P(C=P(C66HH55))
33
Can be made cis or trans selective.Can be made cis or trans selective.
Steroid modificationSteroid modification
O
CH2
H
H
H
O
O
H
H
H
Resonance-stabilized, trans-selective
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5. Addition of Hydroxy Groups 5. Addition of Hydroxy Groups Revisited: Revisited: Baeyer-Villiger Baeyer-Villiger
OxidationOxidationOxidation of ketones by peroxycarboxylic Oxidation of ketones by peroxycarboxylic acids gives acids gives esters:esters:
MechanismMechanism::
Adolf von Adolf von Baeyer Baeyer (1835-1917) (1835-1917) NP 1905. NP 1905.
Victor VilligerVictor Villiger
LipshutzLipshutzCarusoCaruso
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Familiar? Recall: Chapter 9-Familiar? Recall: Chapter 9-33
And Chapter 12-8And Chapter 12-8
The transition state of the Baeyer-The transition state of the Baeyer-Villiger oxidation involves migration Villiger oxidation involves migration of of R’ R’ through a push-pull electronic through a push-pull electronic relay:relay:
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Examples:Examples:
O
Regioselective!Regioselective!
O
O
OHH33CCOOHCCOOH
O
OO
OOH
OO
RegioselectivRegioselective!e!