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1,3-dimethyl-2-imidazolinone (DMI) is an aprotic polar solvent with special physical and chemical properties. It is a colorless, transparent, low viscosity liquid with a unique aliphatic amine odor. It is miscible with water, ethanol, ether, acetone, chloroform and other organic solvents; Insoluble in petroleum ether and cyclohexane, good solubility, acid and alkali resistance. Widely used in medicine, refining, dyes / pigments, microelectronics, engineering plastics, cleaning and surface treatment. It can be used as a high-functional reaction solvent, polymer solvent, and can also be used to produce high-quality polyamide.
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Chemical Formula |
C5H10N2O |
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Exact Mass |
114 |
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Molecular Weight |
114 |
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m/z |
114 (100.0%), 115 (5.4%) |
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Elemental Analysis |
C, 52.61; H, 8.83; N, 24.54; O, 14.02 |
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As a drug transdermal absorbent in the pharmaceutical field, it has significant application effect. In the polymer field, it can promote the mixing of raw materials and catalysts, and improve the chemical, thermal and mechanical properties of polymers; In the field of liquid crystal materials, high-quality porous ultrafiltration membrane can be obtained, which is a liquid crystal positioning agent with stable storage performance; As an organic reaction solvent, it can promote intermolecular and intramolecular condensation reactions to prepare macromolecular heterocyclic compounds. In addition, it has good effects in nucleophilic substitution, reduction, oxidation, elimination, halogen exchange reaction, Kolbe Schmitt reaction and Ullmann reaction under alkaline conditions.
1,3-dimethyl-2-imidazolinone (C5H10N2O, CAS number 80-73-9), abbreviated as DMI, is a non proton strongly polar solvent with high thermal stability, acid and alkali resistance, and excellent solubility. Its colorless, transparent, and low viscosity characteristics make it widely used in fields such as medicine, polymer materials, petrochemicals, microelectronics, dyes and pigments, cleaning, and surface treatment.
1. Drug synthesis solvents and reaction media
DMI, as a non proton polar solvent, can dissolve various organic and inorganic compounds, providing a stable environment for drug synthesis. Its high dielectric constant and solvation effect on cations can catalyze anionic nucleophilic reactions, significantly improving reaction rate and yield. For example:
Antitumor drugs: When synthesizing paclitaxel side chains, DMI acts as a solvent to prevent alcohol oxidation and ensure reaction selectivity.
Antibiotics: When synthesizing ceftriaxone sodium, DMI stabilizes the intermediate structure, extending the half-life of the drug to 8 hours and maintaining an effective concentration for 24 hours with a single administration.
Cardiovascular drugs: When synthesizing beta blockers, DMI as a solvent can inhibit side effects and improve the purity of the target product to over 99%.
2. Key components of transdermal drug delivery system
DMI, as a transdermal absorption enhancer, enhances drug permeability by disrupting the lipid structure of the stratum corneum. For example:
Hormonal drugs: In testosterone patches, DMI can increase the transdermal rate of drugs by three times and achieve a bioavailability of 85%.
Analgesics: After adding DMI to fentanyl transdermal patches, the drug release rate is more uniform, and blood drug concentration fluctuations are reduced by 50%.
3. Innovation in drug formulations
Liposomal carrier: DMI can stabilize the lipid bilayer structure and prolong drug circulation time. For example, in the liposomal formulation of the anticancer drug doxorubicin, DMI prolongs the half-life of the drug from 2 hours to 24 hours.
Nanocrystalline drugs: As a stabilizer, DMI can prevent the aggregation of nanocrystals. In the preparation of antifungal drug itraconazole nanocrystals, DMI increases drug solubility by 10 times and bioavailability by 3 times.
Polymer Materials: From Synthesis Acceleration to Performance Optimization
1. Polymer synthesis solvent
DMI is the only solvent suitable for the production of heat-resistant thermoplastic plastics, which can accelerate polymerization reactions and enhance product performance
Polyimide (PI): In production, DMI promotes the formation of amide groups, resulting in polymers with a molecular weight exceeding 500000. Fibers prepared by solution spinning can withstand temperatures up to 400 ℃.
Polyphenylene sulfide (PPS): DMI, as a solvent, can reduce the content of organic impurities to below 0.1%, meeting the purity requirements of electronic grade materials.
Polyether ether ketone (PEEK): In film stretching processing, DMI treatment reduces the thickness uniformity error of the film to less than 2% and increases the tensile strength by 15%.
2. Catalyst carrier and reaction promoter
Metal catalyst: DMI as a stabilizer can enhance catalyst activity. For example, in palladium catalyzed coupling reactions, the DMI support increases the reaction rate by three times and reduces the catalyst dosage by 50%.
Enzyme catalysis: In the immobilization of biological enzymes, DMI can maintain enzyme activity and achieve a reaction conversion rate of over 95%.
3. Surface modification of materials
Metal coating: DMI, as a pretreatment agent, can enhance the bonding strength between metal and epoxy resin. For example, in aluminum alloy surface treatment, DMI increases coating adhesion by 2 times and extends salt spray resistance time to 1000 hours.
Fiber reinforcement: In carbon fiber composite materials, DMI is used as a sizing agent to increase the shear strength of the fiber resin interface by 30%.
1. BTX aromatic hydrocarbon extractant
DMI can selectively dissolve benzene, toluene, and xylene (BTX), while being insoluble in alkanes, achieving efficient separation:
Catalytic reforming: In the aromatics complex, DMI extraction can increase BTX yield by 5% and reduce energy consumption by 20%.
Gasoline desulfurization: DMI, as an extractant, can selectively remove thiophene sulfides from gasoline, reducing the sulfur content to below 10ppm.
2. Optimization of reaction process
Alkylation reaction: In the alkylation of isobutane and olefins to produce clean gasoline components, DMI as a solvent can achieve a reaction selectivity of 90% and increase the octane value of the product by 3 units.
Hydrocracking: DMI, as a catalyst dispersant, can increase the conversion rate of heavy oil by 10% and the yield of light oil by 8%.
1. photoresist stripping agent
DMI, with its low viscosity, high boiling point (225 ℃), and high temperature resistance, has become an ideal solvent for photoresist stripping on silicon chips
12 inch wafer processing: 1,3-dimethyl-2-imidazolinone stripping agent can shorten the stripping time to 30 seconds, and the metal corrosion rate is less than 0.1nm/min.
Flexible display: In OLED manufacturing, DMI stripping agent can achieve non-destructive stripping, increasing product yield to 99.5%.
2. Liquid crystal material positioning agent
TFT-LCD: DMI, as a liquid crystal positioning agent, can reduce the alignment error of liquid crystal molecules to less than 0.1 ° and improve contrast by 20%.
OLED display: In the vapor deposition process, DMI can stabilize the organic material layer, extending the device's lifespan to over 50000 hours.
1. High performance ink
DMI, as a solvent component, can significantly improve ink performance:
Inkjet printing: In digital printing ink, DMI increases dye solubility by 50%, expands color gamut by 30%, and achieves a wash fastness of 4-5 levels.
3D printing: In light cured resin, DMI serves as a diluent, which can improve printing accuracy to 20 μ m and reduce surface roughness to Ra0.8.
2. Pigment dispersion
Automotive paint: DMI, as a dispersant, can make the pigment particle size distribution D90 less than 1 μ m, increase the glossiness of the paint film by 15%, and extend the weather resistance to 10 years.
Plastic coloring: In the color matching of engineering plastics, DMI can achieve a pigment dispersion uniformity error of less than 5% and a product color difference Δ E ≤ 1.5.
1. Electronic component cleaning agent
Semiconductor manufacturing: DMI based cleaning agents can remove surface particle contaminants from wafers, with particle residues less than 0.1 μ m and metal ion concentrations below 1 ppb.
PCB cleaning: In lead-free soldering processes, DMI cleaning agents can achieve a 99% removal rate of flux residue and increase insulation resistance to over 10 ΩΩ.
2. Metal surface treatment
Aerospace: In the pre-treatment of aluminum alloy anodizing, DMI can reduce the thickness uniformity error of the oxide film to less than 5% and improve the corrosion resistance by three times.
Automotive manufacturing: In the pre-treatment of electrophoretic coating, DMI degreaser can achieve ISO 4 cleanliness on metal surfaces and increase coating adhesion by 20%.
1. Replace toxic solvents
HMPA replacement: DMI, due to its non carcinogenic nature, can completely replace the highly carcinogenic solvent hexamethylphosphoramide (HMPA), increasing the reaction yield to 90% in nucleoside synthesis.
NMP substitution: In lithium battery electrolytes, DMI is more stable than NMP, with a decomposition rate of less than 1% at high temperatures (150 ℃), significantly improving battery safety.
2. Green process development
Water based system: DMI is miscible with water and can be used to develop water-based cleaning agents, reducing VOC emissions by 80% and complying with REACH regulations.
Biodegradation: DMI has a degradation half-life of less than 30 days in natural environments, much lower than traditional solvents (such as DMF's 180 days).
1. Lithium battery electrolyte
Solid state battery: DMI, as a solid electrolyte solvent, can achieve a lithium ion conductivity of 10 ⁻ S/cm and a room temperature cycling life of over 1000 times.
Lithium sulfur battery: DMI based electrolyte can suppress the shuttle effect of polysulfides, increase the Coulombic efficiency to 99%, and achieve an energy density of 500Wh/kg.
2. Biomedical Engineering
Organizational engineering: DMI can be used as a solvent for scaffold materials to prepare porous scaffolds with a porosity of up to 90%, promoting cell adhesion and growth.
Drug delivery: 1,3-dimethyl-2-imidazolinone nanoparticles can achieve targeted delivery, increasing tumor tissue accumulation by 10 times and significantly improving treatment efficiency.
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