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Jones Reagent

Definition: What is Jones Reagent?

The Jones reagent is a mixture of chromium trioxide (CrO3) and sulfuric acid (H2SO4) dissolved in water and acetone to form dichromic acid (H2Cr2O7) and chromic acid (H2CrO4). Sometimes, sodium dichromate (Na2Cr2O7) or potassium dichromate (K2Cr2O7) is also used instead of chromium trioxide. The reaction is fast and exothermic [1-3].

Jones Reagent

Jones Oxidation

Jones oxidation is an organic reaction in which Jones reagent is used to oxidize primary alcohol into a carboxylic acid and secondary alcohol into ketone. The primary alcohol is first converted into aldehyde before converting it into a carboxylic acid. Certain compounds like benzyl alcohol and allyl alcohol give aldehyde only and do not oxidize further [1-3].

Jones Oxidation

Examples of Jones Oxidation [4]

Jones Oxidation Examples

Mechanism For Preparation of Chromic Acid From Jones Reagent [5-8]

Reaction Mechanism for Preparation of Chromic Acid from Jones Reagent

Mechanism of Jones Oxidation[5-8]

Reaction Mechanism for Jones Oxidation

Uses and Applications of Jones Reagent

The Jones oxidation is one of the most fundamental reactions in organic chemistry. The primary purpose of using Jones reagent is to produce carboxylic acid and ketone from a primary and secondary alcohol.

Conditions for Jones Oxidation [9]

If Jones oxidation is carried out under anhydrous condition, then the reaction will stop at aldehyde. However, in the presence of aqueous acid (e.g., aq. H2SO4), it will yield carboxylic acid.


Q.1. Can Jones reagent oxidize aldehydes?

Ans. Jones reagent can be used to oxidize aldehyde resulting in a carboxylic acid.

Q.2. Can Jones reagent oxidize aryl alkanes and alkenes?

Ans.No. Jones reagent does not react with aryl alkanes and alkenes.

Q.3. Can Jones reagent oxidize ketone?

Ans. No. Jones reagent cannot oxidize ketone.


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