Aldehydes Ketones And Carboxylic Acid Revision Full Course Aldehydes Ketones and Carboxylic Acid Notes PDF

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All topics Revision Notes for Full Course Aldehydes Ketones and Carboxylic Acid

Aldehyde, Ketones and Carboxylic Acids

Aldehyde and Ketones

Preparation of Ketones:

a) Oxidation of Secondary alcohols:

Reactions of Aldehydes and Ketones:

a) Aldol condensation

Aldehydes and ketones having alpha hydrogen atom:

b) Cannizzaro reaction:

Aldehydes and ketones having no alpha hydrogen atom:

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When two carbonyl groups are present within a molecule, think of intramolecular reaction. OH^- will attack more positively charged carbon. In this case, it is right >c=0 group.

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c) Formation of Keto Esters

Esters having a-hydrogen on treatment with a strong base e.g. C₂H₅ONa. Undergo self condensation to produce b-keto esters. This reaction is Claisen Condensation.

d) Reformatsky Reaction

This is the reaction of a-haloester, usually an a-bromoester with an aldehyde or ketone in the presence of Zinc metal to produce b-hydroxyester.

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e) Pinacol-pinacolone Rearrangement

The acid catalysed rearrangement of 1,2 diols (Vicinal diols) to aldehydes or ketones with the elimination of water is known as pinacol pinacolone rearrangement.

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a) Wittig-Ylide Reaction

Aldehydes and Ketones react with phosphorus Ylides to yield alkenes and triphenyl phosphine oxide. An Ylide is a neutral molecule having a negative carbon adjacent to a positive hetero atom. Phosphorus ylides are also called phosphoranes.

Preparation of Ylides

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Reaction of Ylide with >C=O

Above things happens in BVO (Bayer Villiger oxidation). Reagents are either per acetic acid or perbenzoic acid or pertrifluoroacetic acid or permonosulphuric acid.

e) Addition of cyanide

f) Addition of bisulfite:

In H₃O⁺, RCHO is regenerated because acetals undergo acid catalyzed cleavage much more easily than do ethers. Since acetals are stable in neutral or basic media, they are used to protect the – CH = O group.

k) Tischenko reaction:

All aldehydes can be made to undergo the Cannizzaro reaction by treatment with aluminium ethoxide. Under these conditions the acids and alcohols are combined as the ester, and the reaction is then known as the Tischenko reaction; eg, acetaldehyde gives ethyl acetate, and propionaldehyde gives propyl propionate.

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Oxidation of Aldehydes and Ketones

Tollen’s test chiefly used for the detection of aldehydes.

Tollen’s reagent doesnot attack carbon-carbon double bonds.

c) Strong Oxidants: Ketones resist mild oxidation, but with strong oxidants at high temperature they undergo cleavage of C – C bonds on either sides of the carbonyl group.

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d) Haloform Reaction

CH₃COR are readily oxidised by NaOI (NaOH + I₂) to iodoform, CHI₃, and RCO₂Na

Example:

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• Reduction:

a) Reduction to alcohols

Carboxylic Acids:

Physical Properties of Carboxylic Acids

• The first three acids are colourless, pungent smelling liquids.

• First four members are miscible in water due the intermolecular hydrogen bonding whereas higher members are miscible in non – polar solvents like ether.

• Benzene or ethanol but immiscible in water due to the increase in the size of lyophobic alkyl chain.

• The b.p. of carboxylic acids are higher than alcohols because carboxylic acids exist as dimers due to the presence of intermolecular H-bonding

• Increase in the number of Halogen atoms on a-position increases the acidity, eg.

CCl₃COOH > CHCl₂COOH > ClCH₂COOH > CH₃COOH

• Increase in the distance of Halogen from COOH decreases the acidity e.g

CH₃ – CH₂ – CH(Cl) – COOH > CH₃ – CH(Cl) – CH₂ – COOH > CH₂ – CH₂ – CH₂ – COOH

• Increase in the electro negativity of halogen increases the acidity.

FCH₂COOH > BrCH₂COOH > ICH₂COOH

Methods of Preparations of Carboxylic Acids

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Chemical Reactions of Carboxylic Acids

a. Salt formation:

2CH₃COOH + 2Na → 2CH₃COO–Na⁺ + H₂

CH₃COOH + NaOH → CH₃COO–Na⁺ + H₂O

CH₃COOH + NaHCO3 → CH3COO–Na⁺ + H₂O + CO₂

b. Conversion into Acid Chlorides:

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Esters

a) Transesterification :

Acid Chlorides:

c) Conversion of Acid Chlorides into Acid Derivatives:

Amides

a. Hydrolysis:

b. Acidic Character of Amides:

2RCONH₂ + HgO → (RCONH)₂Hg + H₂O

c. Basic Character of Amides:

Amides are very feebly basic and form unstable salts with strong inorganic acids. e.g.RCONH₂HCl. The structure of these salts may be I or II

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