13 aldehydes-and-ketones
TRANSCRIPT
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Chapter 13
Aldehydes and Ketones
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1. Structure
The carbonyl group is a double bond between oxygen and carbon.Carbonyl compounds include:
Aldehydes: at least one hydrogen bonded to the carbonyl carbon
Ketones: no hydrogens bonded to the carbonyl carbon.
carboxylic acids and amides. [Tune in NEXT chapter…]
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1. Properties
The carbonyl group is polar.
Intermolecular forces in carbonyl compounds arestronger than in alkanes (nonpolar) or ethers (only slightly polar).weaker than in alcohols, which are polar and can hydrogen bond.
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1. Boiling points
Structure Name Molar mass Boiling point
CH3CH2CH2CH3 butane 58 -0.5 oCCH3-O-CH2CH3 methoxyethane 60 7.0 oCCH3CH2CH2-OH 1-propanol 60 97.2 oC
O ||
CH3CH2-C-Hpropanal 58 49 oC
O ||
CH3-C-CH3
propanone 58 56 oC
♫
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1. Solubility
There is no hydrogen bonding between two carbonyl groups.
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1. Solubility
Aldehydes and ketones can hydrogen bond with water.
Aldehydes and ketones with five or fewer carbon atoms are fairly soluble in water.Large aldehydes and ketones dissolve only in nonpolar solvents.♫
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1. Solubility
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1. Solubility in water—general guidelines
Molecules with polar groups tend to be more soluble in water.
Molecules that can hydrogen bond with water are more soluble than those than cannot.
Increasing the number of polar groups on a molecule increases its water solubility.
Increasing the number of possibilities for hydrogen bonding increases solubility in water.
Increasing the molar mass of a molecule decreases its water solubility.
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2. Nomenclature
Naming aldehydes
The parent compound is named for the longest continuous chain containing the carbonyl group.
The final –e of the parent alkane is replaced with –al.
The chain is numbered beginning at the carbonyl carbon.
Substituents are named and numbered as usual.
The aldehyde is always carbon 1, so no number is used for the carbonyl group.
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2. Nomenclature
The simplest aldehydes
Draw structures for
7,8-dibromooctanal
trans-2-hexenal (component of olive oil)
methanal ethanal
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2. Nomenclature
Name the following compounds.
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2. Nomenclature
Ketones
The rules are analogous to the rules for aldehydes.
The –e ending of the parent alkane is changed to –one.
The location of the carbonyl is indicated with a number. [This number is never 1- because that would be an aldehyde!]
The longest carbon chain is numbered to give the carbonyl the lowest possible number.
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2. Nomenclature
The simplest ketones need no number for the carbonyl. (Why?)
Draw structures for the following compounds.
2-fluorocyclohexanone
3-chloro-2-pentanone
propanone butanone
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2. Nomenclature
Name the following compounds.
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3. Important aldehydes and ketones
What is the relationship between embalming fluid and methanol poisoning?
What is the I.U.P.A.C. name of the following component of lemongrass?
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3. Important aldehydes and ketones
What is the I.U.P.A.C. name for cinnamaldehyde?
Chanel No. 5 became famous for containing synthetic aldehydes “in copious quantities”.*
*Perfume Shrine
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Follow the link for a fun description of properties of aldehydes and ketones.
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3. Important aldehydes and ketones
Aldehydes in perfumery
heptanal: naturally occuring in clary sage and possessing a herbal green odour
octanal: orange-like
nonanal: smelling of roses
decanal: powerfully evocative of orange rind
citral (a more complicated 10-carbon aldehyde): odor of lemons
undecanal: naturally present in coriander leaf oil
unsaturated undecen-1-al
lauryl aldehyde (12 carbons): evocative of lilacs or violets
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4. Reactions--oxidation
Preparation is usually by oxidation of an alcohol.Aldehydes are produced from primary alcohols.
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4. Reactions--oxidation
Ketones are produced from secondary alcohols.
Tertiary alcohols don’t undergo oxidation (no –H to lose).♫
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4. Reactions--oxidation
Oxidation of aldehydes and ketonesAldehydes can be oxidized to carboxylic acids.
loss of a bond to H, gain of a bond to O
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4. Reactions--oxidation
Oxidation of aldehydes and ketonesKetones can’t be oxidized further.
N.R. (no –H to lose)
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4. Reactions--oxidation
Tollen’s test is used to distinguish between aldehydes and ketones based on their ability to be oxidized.
When one substance is oxidized, another must be reduced.
+ Ag(NH3)2+ + Ago
Tollen’s reagent elemental silver
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4. Reactions--oxidation
+ Ag(NH3)2+ + Ago
elemental silver
If an aldehyde is present, a “silver mirror” forms on the inside of the glass container.
If a ketone is present, there is no reaction because it won’t undergo oxidation.
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4. Reactions--oxidation
The same process used in Tollen’s test used to be used to produce silvered mirrors.
This is an article published in 1911 describing the process, if you are interested!
Go here to see a 2-liter flask turned into a mirror.
For EXTRA CREDIT, explain what precautions need to be taken when the Tollen’s test is carried out. You’ll have to watch the video. Post your answer in the Module 4 Journal Answers journal with the tag Tollen.
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4. Reactions--oxidation
Draw the structure of the following compounds and their oxidation products.
2-methyl-2-propanol
2-nonanol
1-decanol
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4. Reactions--oxidation
What reaction will pentanal undergo, if any, with Tollen’s reagent?
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4. Reactions--oxidation
Benedict’s test is used to distinguish between reducing and non-reducing sugars.
A reducing sugar can be oxidized.The substance reduced is Cu+2
.
reducing sugar + Cu+2 oxidized sugar + Cu2O
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4. Reactions--oxidation
Benedict’s test
+ Cu+2
+ Cu2O
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4. Reactions—blast from the past
Can you remember Chapter 12?Preparation of alcohols by hydrogenation of aldehydes and ketones (slide 19)
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4. Reactions--reduction
Hydrogenation is a reduction reaction.More bonds to hydrogen, fewer bonds to oxygen
Reduction of an aldehyde or ketone requires a Ni, Pt, or Pd catalyst. [sound familiar?]
Reduction of an aldehyde produces a primary alcohol.Reduction of a ketone produces a secondary alcohol.
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4. Reactions--reduction
What is the product of reduction of
1-chloropropanone?
2-methylpropanal?
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4. Reactions--addition
Take the time machine back to Chapter 11 now.Alkenes undergo addition reactions:
Hydrogenation (addition of H2)
Halogenation (addition of X2)
Hydration (addition of H2O)
Hydrohalogenation (addition of HX)
General addition reaction
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4. Reactions--addition
Addition of an alcohol to an aldehyde:
H+
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4. Reactions--addition
The product is called a hemiacetal (-OH and –OR attached to the same carbon).
Hemiacetals are very reactive.They react with an additional alcohol molecule, losing –OH and adding another –OR.
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4. Reactions--addition
The final product is an acetal (2 –OR groups attached to one carbon).
hemiacetal acetal
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4. Reactions--addition
Ketones undergo analogous addition reactions with alcohols.
The initial product is a reactive hemiketal (two –R groups, one –OH, and one –OR).An additional –OR group is added to the hemiketal to produce a ketal.
hemiketal ketal
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4. Reactions--addition
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4. Reactions
Hemiacetal, acetal, hemiketal, or ketal?
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4. Reactions
Monosaccharide addition reactions
1
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4
5
6 ]alcohol
aldehyde
D-glucose
]
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1
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5
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4. Reactions
Monosaccharide addition reactions
The cyclic form is more stable than the linear form and no further oxidation takes place in this case.
Hemiacetal: one –H one –OH one –OR one -R
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4. Reactions: keto-enol tautomers
Tautomers differ from each other in the placement of one hydrogen and one double bond.
The two forms exist in an equilibrium mixture, mostly in the keto form, which is more stable.
Keto form (ketone)
Enol form (alcohol + alkene)
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4. Reactions: keto-enol tautomers
Draw the keto and enol forms of
propanone.
propanal.
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4. Reactions: aldol condensation
In an aldol condensation, aldehydes or ketones react to make a larger molecule by forming a new carbon-carbon bond between two molecules.
+
OH- or enzyme
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4. Reactions: aldol condensation
Write an equation for the aldol condensation of two molecules of propanal.
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