Preparation and properties of aldehydes and ketones
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Preparation And Properties Of Aldehydes and Ketones. Prepared By Prerna Gupta KV Samba. IUPAC Nomenclature Of Aldehydes. 1.Number the longest chain starting from carbon of aldehyde group. 2. Name the compound by changing -e to -al (e.g. ethan e to ethan al ).

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Preparation And Properties Of Aldehydes and Ketones

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Preparation and properties of aldehydes and ketones

Preparation And Properties Of Aldehydes and Ketones

Prepared By

Prerna Gupta

KV Samba


Iupac nomenclature of aldehydes

IUPAC Nomenclature Of Aldehydes

  • 1.Number the longest chain starting from carbon of aldehyde group.2. Name the compound by changing -e to -al (e.g. ethane to ethanal).


Iupac nomenclature of ketones

IUPAC Nomenclature Of Ketones

1.Number the longest chain from the end nearest to the carbonyl group.2. Name the compound by changing -e to -one (e.g. ethane to ethanone).


Preparation of aldehydes

Preparation of Aldehydes

1. From acyl chloride (Rosenmund reduction) :


Preparation and properties of aldehydes and ketones

2. From nitriles:(I) Stephen reaction :

(II) reduction of nitrile by diisobutylaluminium hydride ( AlH(i-Bu)2) and (DIBAL-H) to imine followed by hydrolysis:


Preparation and properties of aldehydes and ketones

3. From aromatic hydrocarbons to aromatic aldehydes:

(I) By oxidation of methylbenzene:

(a) Using chromyl chloride (CrO2Cl2) (Etard reaction):

  (b) Using chromic oxide (CrO3):


Preparation and properties of aldehydes and ketones

(II) Chlorination followed by hydrolysis:


Preparation and properties of aldehydes and ketones

(III)  by Gatterman - Koch reaction:


Preparation of ketones

Preparation of Ketones

1. From acyl chlorides:


Preparation and properties of aldehydes and ketones

2. From nitriles:


Preparation and properties of aldehydes and ketones

3. From Friedel-Crafts acylation reaction:


Reactions of aldehydes and ketones

Reactions of aldehydes and ketones

1. Reduction:

(i) Reduction of aldehydes and ketones to primary or secondary alcohol using sodium borohydride or lithium aluminum hydride.

(ii) Reduction of aldehydes or ketones to hydrocarbons using Clemmensonreduction or Wolff-Kishner reduction


Preparation and properties of aldehydes and ketones

2. Oxidation:

Oxidation of ketones require more stronger oxidizing agent in more vigorous conditions than aldehydes

  • Tollen's test(used to distinguish aldehydes from ketones, aldehydes give positive test by producing a bright silver mirror):

  • Fehling's test(used to distinguish aldehydes from ketones, aldehydes give positive test by producing a red-brown ppt. except aromatic aldehydes):


Preparation and properties of aldehydes and ketones

  • Oxidation of methyl ketones using haloform reaction: both aldehydes and ketones having at least one methyl group attached to the carbonyl carbon will react to give a product having one less carbon atom as shown in the reaction below:


Preparation and properties of aldehydes and ketones

3. Reaction due to α-hydrogen:

  • Aldol condensation


Preparation and properties of aldehydes and ketones

  • Cross aldol condensation:


Preparation and properties of aldehydes and ketones

4. Other reactions

  • Cannizzaroreaction:


Preparation and properties of aldehydes and ketones

  • Electrophilic substitution reaction:


Preparation and properties of aldehydes and ketones

Thank you


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