CAS 127-19-5 N,N-Dimethylacetamide DMAC and CAS 68-12-2 N,N-Dimethylformamide DMF are two commonly used polar non-protonic solvents with similar chemical properties but significant differences.
In short, they are like "cousins" with similar structures, but DMAC possesses an additional methyl group (-CH₃) compared to DMF. This structural difference confers superior performance in certain aspects for DMAC while also resulting in distinct toxicity and environmental impacts.
Dimethylacetamide (DMAC) vs Dimethylformamide (DMF): Properties differences
| Property | DMAC | DMF |
|---|---|---|
| CAS Number | 127-19-5 | 68-12-2 |
| Molecular Formula | C4H9NO | C3H7NO |
| Molecular Weight | 87.12 g/mol | 73.09 g/mol |
| Structural Formula | CH₃CON(CH₃)₂ | HCON(CH₃)₂ |
| Boiling Point | 165–166°C | 153°C |
| Density | 0.94 g/cm³ | 0.944 g/cm³ |
| Solubility | Miscible with water and organic solvents | Miscible with water and organic solvents |
| Solvent Type | Polar aprotic solvent | Polar aprotic solvent |
The most core difference: DMF is a derivative of formamide (formic acid HCOOH with the hydroxyl group removed), while DMAC is a derivative of acetamide (acetic acid CH₃COOH with the hydroxyl group removed). This "extra methyl group" is the root cause of all the performance differences.
Because they all dissolve polymers, salts, and organic compounds exceptionally well, they are widely used in chemical synthesis.
Dimethylacetamide (DMAC) vs Dimethylformamide (DMF): Application Comparison
1. Pharmaceutical Manufacturing
DMAC solvent is used in API synthesis, peptide chemistry, antibiotics, and antiviral intermediates.
DMF solvent is widely used in acrylic fiber production, synthetic leather, and general polymer processing.
2. Polymer and Fiber Production
In the polymer industry, dimethylacetamide DMAC is often the preferred solvent.
N,N-Dimethylacetamide DMAc is the main solvent for spandex, polyimide, aramid fiber, polyacrylonitrile; ideal for high-temperature polymerization.
3. Coatings & Films
DMAC is used in high-performance coatings, insulating films, and functional films with high thermal stability.
DMF Preferred for coatings, adhesives, and films requiring fast evaporation.
4. Organic Synthesis
Both solvents are commonly used in organic synthesis, because they are polar aprotic solvents, they help increase reaction efficiency.
How to Choose Solvents?
Choose DMF solvent if you need to dissolve polyurethane (PU) and acrylic (PAN), prioritize cost efficiency, and rely on mature industrial processes-it remains the mainstream option for these applications.
Opt for DMAC solvent when dissolving high-performance polymers like aramid and polyimide, or when higher thermal and solution stability is required; it is often the best or only viable choice.
For pharmaceutical synthesis demanding high-boiling and stable solvents, both can be used, with the final decision based on reaction specificity and toxicological data.
For health safety, both solvents require strict protective measures, including full ventilation, proper PPE, and occupational health monitoring. DMAC has reproductive toxicity, so extra caution is necessary for pregnant workers.
As for eco-friendly alternatives, options like ionic liquids and NMP are being developed, but no solvent can fully replace Dimethylacetamide DMAC and Dimethylformamide DMF in all performance aspects.
FAQ
Can DMAC replace DMF in chemical reactions?
Yes, Dimethylacetamide (DMAc or DMAC) can replace Dimethylformamide (DMF) in many chemical reactions, but it is not a universal substitute.
Which solvent has a higher boiling point, DMAC or DMF?
DMAC has a higher boiling point.
| Solvent | Boiling Point |
|---|---|
| DMAC | ~165–166°C |
| DMF | ~153°C |
Is Dimethylacetamide the same as DMF?
No, dimethylacetamide (DMAc or DMA) is not the same substance as DMF (dimethylformamide). Although both are closely related polar non-protonic solvents, they differ in chemical structure, boiling point, and safety characteristics.
Why Choose gneebio?
Gneebio is a leading chemical manufacturer and supplier in China, specializing in the global export of high-quality Dimethylacetamide (DMAC) and Dimethylformamide (DMF). Committed to consistent quality, competitive pricing, and professional export services, Gneebio is a trusted partner for customers worldwide seeking reliable DMAC and DMF supply.
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