What is DMP Reagent Structure Reaction Mechanism and Uses
DMP's full form is Dess Martin Periodinane, which is commercially accessible and decomposes slowly. However, DMP is heat- and shock-sensitive and shows an exotherm once heated >130 °C. DMP chemical may be a widely used chemical agent for the mild oxidation of alcohols to aldehydes and ketones. The neutral condition of the oxidation reaction makes DMP an appropriate selection in syntheses of sensitive, functionally complex intermediates. DMP shows several merits over other common oxidative agents like Cr and DMSO-based oxidants; so, it's habitually used in the total synthesis of natural products.
DMP Reagent
Dess-Martin periodinane (DMP), a commercially accessible chemical, is often used as a mild oxidative agent for the selective oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones, respectively.
Dess Martin Reagent
DMP could be a relatively mild chemical agent that may be used under neutral conditions providing a high degree of selectivity and functional group compatibility. Other advantages include the fact that DMP is far less harmful than Cr-based alternatives and therefore, the work-up is comparatively easy. One of the main drawbacks is the potential explosive capability of DMP. The cost of DMP is also comparatively high and its high molecular weight typically necessitates using quite a lot of chemical agents.
Dess Martin Periodinane Oxidation
Alcohols can be oxidised to aldehydes, ketones, and carboxylic acids depending on their structure and also the type of oxidant used. Oxidising agents are typically classified as strong and mild oxidising agents. Mild oxidising reagents stop the oxidation of the alcohol once the carbonyl group is formed. And if it's a primary alcohol, the product formed is an aldehyde whereas the oxidation of secondary alcohol leads to ketone formation. The strong oxidising agents oxidise primary alcohols to carboxylic acids and secondary alcohols to ketones.
Oxidation of Alcohol Using DMP As an Oxidising Agent
Mechanism of Dess Martin Oxidation
Dess–Martin periodinane (DMP oxidation) may be a selective methodology for oxidising primary alcohols to aldehydes.
Dess Martin Oxidation Example
Another advantage of using the DMP chemical as an oxidant is that it can be performed under milder conditions and does not need the presence of strong acids. The reaction starts with the substitution of the iodine where the alcohol replaces one of the acetate ions followed by deprotonation that forms an aryl iodo(III) ester–periodinane intermediate.
Mechanism of Dess Martin Oxidation
The periodinane intermediate is then transformed to the corresponding carbonyl compound by attainable intramolecular removal of the ɑ-hydrogen to form a C=O π bond.
Preparation of DMP Reagent
Dess-Martin Periodinane (DMP) is an acylated variant of the oxidant IBX. The acyl group provides DMP additional solubility in organic solvents than IBX. The most friendly synthesis of IBX has been determined to be treating 2-iodobenzoic acid with oxone in water, at elevated temperatures for three hours.
Preparation of DMP Reagent
Interesting Fact
It is named after the American chemists Daniel Benjamin Dess and James Cullen Martin who developed the chemical agent in 1983.
It is based on IBX; however, because of the acetate groups connected to the central iodine atom, DMP is far more reactive than IBX and is much more soluble in organic solvents.
Important Question
1. What does DMP do to primary alcohol?
Ans: DMP is a chemical agent used to oxidise primary alcohols to aldehydes and secondary alcohols to ketones.
2. What is IBX in organic chemistry?
Ans: 2-Iodoxybenzoic acid (IBX) is a chemical compound used in organic synthesis as an oxidising agent. This periodinane is particularly suited to oxidise alcohols to aldehydes.
Conclusion
Dess–Martin periodinane (DMP) may be a hypervalent iodine reagent used to oxidise primary alcohols to aldehydes and secondary alcohols to ketones. This chemical agent is enticing because of its operation under mild conditions (room temperature, neutral pH), short reaction times, higher yields, high chemoselectivity, tolerance of sensitive functional groups, and long life on the shelf. The presence of acetate groups makes DMP more soluble in a very wider range of solvents compared to the IBX chemical agent.
FAQs on DMP Reagent in Organic Chemistry Oxidation of Alcohols
1. What is DMP reagent in organic chemistry?
The DMP reagent is Dess–Martin periodinane, a mild and selective oxidizing agent used to convert primary and secondary alcohols into aldehydes and ketones. It is a hypervalent iodine(V) compound derived from 2-iodobenzoic acid. In organic synthesis, DMP is preferred because it:
- Works under mild, neutral conditions
- Prevents overoxidation of aldehydes to carboxylic acids
- Gives high yields with good functional group tolerance
2. What is the chemical name and formula of DMP reagent?
The chemical name of DMP reagent is Dess–Martin periodinane, and its molecular formula is C13H13IO8. It is a hypervalent iodine(V) compound structurally related to IBX (2-iodoxybenzoic acid). Key features include:
- Iodine in the +5 oxidation state
- Three acetate (–OCOCH3) groups attached to iodine
- A benziodoxole ring system
3. What does DMP reagent do to alcohols?
The DMP reagent oxidizes primary alcohols to aldehydes and secondary alcohols to ketones without further oxidation. For example:
- R–CH2OH → R–CHO (primary alcohol to aldehyde)
- R2CHOH → R2C=O (secondary alcohol to ketone)
4. How does DMP reagent work in the oxidation mechanism?
The DMP oxidation mechanism involves formation of an alkoxyiodinane intermediate followed by elimination to form a carbonyl compound. The steps are:
- Alcohol oxygen attacks the iodine(V) center of DMP
- Formation of an alkoxyiodinane intermediate
- Elimination and transfer of electrons to form the C=O bond
5. What is the difference between DMP and PCC reagent?
The main difference is that DMP is a hypervalent iodine oxidant, while PCC (pyridinium chlorochromate) is a chromium(VI)-based oxidizing agent. Key differences include:
- DMP is less toxic and chromium-free
- PCC contains heavy metal chromium and generates hazardous waste
- Both oxidize primary alcohols to aldehydes and secondary alcohols to ketones
- DMP generally works under milder and more neutral conditions
6. Why is DMP reagent considered a mild oxidizing agent?
DMP is considered a mild oxidizing agent because it selectively oxidizes alcohols without harsh acidic or strongly basic conditions. Its mild nature is due to:
- Neutral reaction conditions (often in dichloromethane)
- Minimal side reactions
- No strong acids or heavy metals involved
7. Does DMP oxidize primary alcohols to carboxylic acids?
No, DMP typically oxidizes primary alcohols only to aldehydes and does not further oxidize them to carboxylic acids under normal conditions. For example:
- R–CH2OH → R–CHO (stops at aldehyde)
8. What are the advantages of using DMP reagent in organic synthesis?
The main advantages of DMP reagent are high selectivity, mild conditions, and good functional group tolerance. Important benefits include:
- High yields of aldehydes and ketones
- No overoxidation of aldehydes
- Compatible with sensitive groups (e.g., alkenes, ethers)
- Easy work-up and fewer toxic byproducts compared to chromium reagents
9. Is DMP reagent the same as IBX?
No, DMP (Dess–Martin periodinane) and IBX (2-iodoxybenzoic acid) are related but not identical oxidizing agents. Differences include:
- DMP is a more soluble, acetylated derivative of IBX
- IBX has the formula C7H5IO4
- DMP is generally more reactive and works under milder conditions
10. Can you give an example reaction using DMP reagent?
A common example is the oxidation of ethanol to ethanal using DMP reagent. The reaction is:
- CH3CH2OH → CH3CHO
- (CH3)2CHOH → (CH3)2CO
