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Dimethylformamide

N,N-Dimethylformamide (DMF), with the C₃H₇NO and CAS number 68-12-2, is a versatile commonly used as an aprotic polar in industrial and laboratory applications. It appears as a clear, colorless to pale yellow liquid with a faint fishy or amine-like , a molecular weight of 73.09 g/mol, a of 153 °C, a of -61 °C, a of 0.944 g/mL at 20 °C, and complete with water and most solvents. DMF has a of 58 °C (136 °F), making it flammable, with vapors heavier than air that can travel to ignition sources and flash back. As one of the most widely used industrial solvents, DMF plays a key role in the manufacture of synthetic fibers (such as and ), films, surface coatings, and adhesives, where it dissolves vinyl-based polymers and facilitates processing. It is also employed in as a reaction medium, in and pharmaceutical , electrolytic processes, petroleum refining, and as a component in paint removers and cleaning agents. Industrially, DMF is primarily synthesized through the of with in the presence of a catalyst, such as in , yielding high-purity product on a large scale. Despite its utility, DMF poses significant health and safety risks; it is toxic by , dermal , and , acting as a potent liver that can cause acute hepatic damage, , and upon short-term exposure. Chronic exposure is associated with , including birth defects and developmental issues, leading to its classification as a Category 1B reproductive toxicant, as well as potential liver and damage. Environmentally, DMF is persistent in and , with moderate , and its release can contribute to , prompting regulatory limits in discharges.

Molecular Structure and Properties

Chemical Structure

Dimethylformamide, systematically named N,N-dimethylformamide, has the molecular formula C₃H₇NO and the condensed structural formula (CH₃)₂NCHO. This structure consists of an amide functional group where the nitrogen atom is bonded to two methyl groups and a formyl moiety (–CHO), distinguishing it from simpler formamides such as formamide (HCONH₂) or N-methylformamide (HCONHCH₃). The IUPAC nomenclature emphasizes the N,N-substitution to highlight its specific isomeric form among substituted formamides, as the two methyl groups on nitrogen prevent tautomerism or other positional isomerism typical in less substituted analogs. The group in dimethylformamide adopts a planar configuration due to delocalization between the carbonyl π-bond and the , resulting in partial double-bond character for the C–N linkage and a shortened C=O bond. This stabilization restricts rotation about the C–N bond, with a measured rotational barrier of approximately 88 kJ/mol, contributing to the molecule's overall planarity around the core. Spectroscopic studies, including and , confirm key bond lengths: the C=O bond measures about 1.20 , indicative of its partial single-bond influence from , while the C–N bond is elongated to roughly 1.35 compared to a typical single C–N bond (1.47 ), reflecting the double-bond character.

Physical and Thermodynamic Properties

Dimethylformamide (DMF) is a colorless, hygroscopic liquid at , exhibiting a faint fishy characteristic of low-molecular-weight amides. Its molecular weight is 73.09 g/. DMF demonstrates a wide liquid range, with a of -61 °C and a of 153 °C at standard pressure. The density is 0.944 g/cm³ at 25 °C, and the is 1.430 at 20 °C. These properties render DMF stable under ambient conditions but prone to slow in the presence of moisture. DMF is fully miscible with and most solvents, owing to its amphiphilic . Its dielectric constant is approximately 37 at 25 °C, underscoring its high suitable for dissolving polar and ionic compounds. Key thermodynamic properties include a heat of of 47.6 kJ/mol at 25 °C and a of 0.802 at 25 °C. The of 58 °C indicates moderate flammability risks during handling. Spectroscopically, DMF displays characteristic features: the () absorption for the C=O stretch occurs at approximately 1660 cm⁻¹, shifted from typical ketones due to involvement. In (¹H NMR) , the methyl groups appear as two closely spaced singlets at approximately 2.95 and 3.05 , corresponding to the and positions relative to the formyl group, while the formyl proton resonates at about 8.0 .

Synthesis and Production

Historical Development

Dimethylformamide (DMF) was first synthesized in 1893 by French chemist Albert Verley, who obtained it by distilling a mixture of and . This initial preparation highlighted DMF's potential as an , though it remained largely unexplored for practical applications in the late . Early research focused on its chemical properties as a derivative, with limited documentation of its reactivity or utility beyond basic . In the early 1940s, DMF gained recognition as an effective solvent for , enabling the production of synthetic fibers and films. This development was driven by researchers at , including R.C. Houtz, who identified DMF's ability to dissolve in 1941, facilitating wet-spinning processes for acrylic textiles. 's adoption marked a pivotal shift, positioning DMF as a key industrial solvent amid the growing demand for synthetic materials during and after . The naming of the compound evolved to reflect structural clarity; initially termed dimethylformamide, it became standardized as N,N-dimethylformamide to specify the nitrogen-substituted structure and distinguish it from potential O-substituted isomers. Commercial production scaled up in the mid-20th century with continuous processes using and , to meet industrial needs. These innovations expanded DMF's role in processing during the mid-20th century, solidifying its status as a versatile aprotic in chemical .

Industrial Synthesis Methods

The primary industrial synthesis of dimethylformamide (DMF) involves the direct carbonylation of with in as a , catalyzed by an alkali such as . This continuous process operates at pressures of 15–25 atm (1.5–2.5 ) and temperatures of 110–150 °C, enabling efficient conversion in a liquid-phase reactor. Yields for this method typically range from 95% to 98%, reflecting high selectivity and minimal byproducts under optimized conditions. An alternative two-step route begins with the of to using , followed by its reaction with at 80–100 °C and low pressure, producing DMF and as a . This approach offers flexibility in feedstock handling but is less common than the direct process due to additional separation steps. Following synthesis, DMF is purified via distillation under reduced pressure to separate water, unreacted methanol, and trace impurities, ensuring high-purity product suitable for industrial applications. Global production of DMF was approximately 870,000 tons in 2022, with China accounting for over 70% of output; as of 2024, production volume remained around 870,000 tons, driven by demand in chemical and pharmaceutical sectors.

Chemical Reactions and Reactivity

Solvent Properties and Reactions

Dimethylformamide (DMF) serves as a polar aprotic solvent characterized by a high donor number of 26.6 kcal/mol, enabling effective stabilization of anions through coordination without hydrogen bonding interactions. This property arises from the solvent's ability to solvate cations via its carbonyl oxygen while leaving nucleophilic anions relatively unsolvated and highly reactive. As a result, DMF enhances the rates of polar mechanisms, including SN2 displacements on alkyl halides and nucleophilic acyl substitutions on carboxylic acid derivatives. In specific reactions, DMF participates directly as a reagent, notably in the Vilsmeier-Haack formylation, where it combines with (POCl₃) to generate a reactive ion that introduces a formyl group to electron-rich aromatic substrates. The mechanism involves initial activation of DMF's carbonyl by POCl₃, leading to chloride displacement and formation of the chloromethyleneiminium ion, which then undergoes followed by to the . DMF's carbonyl oxygen lone pair facilitates coordination with metal cations in coordination chemistry, forming solvates with alkali metals like Li⁺ and divalent transition metals such as Co²⁺ and Ni²⁺, often resulting in octahedral or tetrahedral geometries depending on the ion. These interactions are particularly relevant in organometallic reactions and battery electrolytes, where DMF's donor ability influences ion mobility and stability. At elevated temperatures above 150 °C, DMF demonstrates mild reducing properties, capable of reducing certain ions (e.g., Ag⁺ to Ag⁰) through pathways that generate reducing species like . This temperature-dependent behavior expands its utility beyond in high-temperature synthetic processes.

Specific Chemical Transformations

Dimethylformamide (DMF) plays a central role in the Vilsmeier-Haack reaction, where it acts as a formylating agent for . In this process, DMF reacts with phosphorus oxychloride (POCl₃) to generate the Vilsmeier-Haack reagent, a chloromethyleneiminium species represented as [(CH₃)₂N=CHCl]⁺ Cl⁻. This electrophile attacks electron-rich aromatic compounds (ArH), forming an intermediate that, upon aqueous , yields the corresponding (ArCHO). The reaction is particularly useful for formylating activated aromatics like , anilines, and heterocycles, proceeding under mild conditions with high . A variant of the incorporates DMF as a co-solvent alongside (DMSO) and to facilitate the conversion of primary alcohols to aldehydes. In this modified procedure, the activation of DMSO by forms a intermediate that promotes the oxidation, with DMF enhancing solubility and reaction efficiency in mixed systems such as /DMF. This approach maintains the mild, metal-free conditions of the original Swern method while allowing adaptation for substrates sensitive to standard solvents. DMF serves as a formyl source in the N-formylation of primary and secondary amines, yielding N-formyl derivatives under catalytic conditions. For instance, using CeO₂ as a catalyst, amines react with DMF to produce formamides without acidic or basic additives, tolerating water and proceeding via nucleophilic attack on activated DMF intermediates. This method is efficient for aliphatic and aromatic amines, offering a green alternative to traditional formylating agents like derivatives. DMF undergoes in aqueous media, particularly under acidic or basic conditions, to produce (HN(CH₃)₂) and (HCOOH). This reversible reaction shifts toward products at elevated temperatures or with catalysts like heteropolyacids. Thermally, DMF decomposes near its (153 °C) to (CO) and , with further high-temperature breakdown of yielding (CH₄) among other products. These pathways highlight DMF's instability under hydrolytic or pyrolytic stress.

Applications

Industrial and Commercial Uses

Dimethylformamide (DMF) serves as a critical industrial in the production of materials, where it dissolves polyurethane polymers to enable the manufacturing of fibers, synthetic leathers, and protective coatings, leveraging its ability to form stable solutions for wet-spinning and coating processes. A substantial portion of DMF is also utilized in acrylic fiber manufacturing, where it acts as a to dissolve , facilitating the and spinning of synthetic fibers for textiles and apparel; this application accounted for approximately 38% of global DMF consumption in 2022. This highlights DMF's efficacy in handling high-molecular-weight polymers at scale. In the pharmaceutical sector, DMF is used as a in the production of various intermediates. The global DMF market reached approximately 870,000 metric tons annually in 2022, with major production occurring in and the , driven by demand from these industrial applications.

Laboratory and Research Applications

Dimethylformamide (DMF) serves as a versatile in within laboratory settings, particularly for reactions involving organometallic reagents. In Grignard reactions, DMF is employed to facilitate the formation and reactivity of organomagnesium compounds, especially in cases requiring enhanced or electrochemical preparation methods, where it supports the generation of unusual Grignard-type reagents that react with electrophiles to yield substituted products. Its ability to dissolve a wide range of substrates without proton donation makes it suitable for maintaining the stability of these sensitive intermediates during small-scale syntheses. DMF is also widely utilized in palladium-catalyzed cross-coupling reactions, such as the Suzuki-Miyaura coupling, due to its high solvating power for both organic substrates and inorganic catalysts. For instance, in the synthesis of biaryl compounds like , DMF enables efficient coupling of aryl halides with boronic acids under sonication-enhanced conditions, achieving high yields with catalysts at mild temperatures. Ligand-free protocols in aqueous DMF further demonstrate its role in promoting selective C-C bond formation while minimizing side reactions in research-oriented optimizations. In , DMF functions as a primary co-solvent in the Fmoc (9-fluorenylmethoxycarbonyl) solid-phase strategy, enhancing the solubility of protected and resins during and deprotection steps. It is routinely used in /DMF mixtures for Fmoc removal, ensuring efficient chain elongation in automated synthesizers, though its degradation over time necessitates quality control to avoid impurities like that could affect yields. Recent efforts explore greener alternatives, but DMF remains standard for its compatibility with reagents in laboratory-scale production of complex peptides. Within research, DMF acts as a medium for solutions in studies, particularly lithium-ion systems, where it improves ionic and interfacial . As an additive, DMF blocks unwanted reactions, boosting specific , , and in LiFePO4-based cells by forming protective layers on . Its coordination properties also enable the design of composite polymer electrolytes for long-life lithium metal batteries, addressing dendrite growth through solvent-tethered structures. In recent research, DMF plays a key role in the fabrication of cells, serving as a in precursor solutions for depositing high-quality films. Post-2020 studies highlight its use in mixtures with DMSO to achieve uniform crystallization of lead halide perovskites, enabling power conversion efficiencies exceeding 20% in lab-fabricated devices, though efforts focus on mitigating side reactions like transamidation during film formation. This application underscores DMF's utility in advancing scalable, solution-processed photovoltaic prototypes.

Health, Safety, and Toxicity

Acute and Chronic Toxicity

Dimethylformamide (DMF) exhibits low to moderate , with an oral LD50 in rats of approximately 2,800–3,040 mg/kg, indicating that significant lethality requires high doses. Direct contact with DMF can cause to the skin and eyes, leading to redness, itching, and in some cases, upon repeated exposure. Inhalation of DMF vapors, particularly in occupational settings via dermal absorption or respiratory exposure, may result in symptoms such as , , , and within hours of acute high-level exposure. Chronic exposure to DMF is primarily associated with , manifesting as elevated liver enzymes, hepatic , and in severe cases, progression to or . DMF is classified as probably carcinogenic to humans (), with limited evidence in humans for and sufficient evidence in experimental animals for liver and tumors. has been observed in animal models, where DMF acts as a teratogen, inducing developmental malformations such as skeletal anomalies and reduced fetal weight in rats and mice, with potential links to birth defects through impaired fertility and embryotoxicity. The toxicological mechanisms of DMF involve metabolic activation primarily by cytochrome P450 enzymes, leading to the formation of reactive intermediates such as N-methylformamide, which conjugate with glutathione to produce S-(N-methylcarbamoyl)glutathione; this process generates protein adducts and induces oxidative stress through reactive oxygen species production and depletion of cellular antioxidants. Recent studies from 2023–2025 have highlighted kidney damage from DMF exposure via antioxidant depletion, including reduced glutathione levels and increased lipid peroxidation in renal tissues, exacerbating nephrotoxicity. Investigations using zebrafish models have demonstrated developmental toxicity in embryos, including impaired cardiac function and reduced blood circulation.

Exposure Risks and Symptoms

Dimethylformamide (DMF) is primarily absorbed by humans through dermal contact and of vapors, with occurring rarely due to its industrial use patterns. Dermal absorption is the most significant route in occupational settings, contributing approximately 40% of total under controlled conditions simulating scenarios. occurs via vapors in poorly ventilated areas, leading to rapid uptake into the bloodstream. Occupational risks are elevated in production and coating plants, where workers handle DMF as a for acrylic fibers, surface coatings, and inks. Common symptoms in these environments include and a disulfiram-like intolerance to , manifesting as facial flushing, , and after consumption. These effects arise even at low levels and can persist post-shift. Acute exposure symptoms typically include vertigo (dizziness), anorexia (loss of appetite), , and , often appearing within 48 hours of high-level contact. Chronic exposure is associated with liver enlargement (), testicular pain, and menstrual disorders in affected individuals, reflecting prolonged systemic effects. Case reports highlight these reproductive and hepatic symptoms in workers with repeated low-dose exposure. relies on through urinary levels of (NMF), the primary metabolite of DMF, which correlates directly with absorbed dose and aids in evaluating occupational health risks.

Regulations and Environmental Impact

Regulatory Framework

In the United States, the (OSHA) has established a (PEL) for dimethylformamide (DMF) of 10 (30 mg/m³) as an 8-hour time-weighted average (), with a notation indicating significant through the . Similarly, the National Institute for Occupational Safety and Health (NIOSH) recommends a REL of 10 (30 mg/m³) , also with a notation, to protect workers from adverse effects associated with and dermal exposure. The International Agency for Research on Cancer (IARC) classifies DMF as Group 2B, possibly carcinogenic to humans, based on limited evidence in experimental animals and inadequate evidence in humans. In the , DMF is regulated under framework, where it is classified as a category 1B (Repr. 1B), indicating presumed human based on . Commission (EU) 2021/2030 imposes restrictions effective from December 12, 2023, prohibiting the placement on the market or use of DMF as a substance or in mixtures exceeding 0.3% by weight for industrial and professional applications unless appropriate measures are implemented to ensure that the exposure of workers to DMF is below the derived no-effect level (DNEL) of 6 mg/m³ for and 1.1 mg/kg body weight/day for dermal exposure, with longer transition periods for certain uses to allow substitution with safer alternatives. These measures aim to minimize worker and consumer exposure due to DMF's reprotoxic properties. Additionally, under the (EC) No 1223/2009, DMF is prohibited in cosmetic products as a category 1B reproductive toxicant listed in Annex II. Globally, these regulations reflect DMF's health hazards, including reproductive toxicity, which underpin the exposure limits and restrictions to safeguard occupational and public health.

Environmental Fate and Mitigation

Dimethylformamide (DMF) exhibits favorable environmental fate characteristics, primarily due to its high water solubility and susceptibility to biological degradation. In aquatic and soil environments, DMF is readily biodegradable under aerobic conditions, with reported half-lives ranging from 18 to 36 hours in water and similar durations in soil. During microbial degradation, DMF is primarily converted to dimethylamine and formic acid (formate) as intermediate products, facilitating its breakdown into less harmful compounds. Abiotic processes, such as photolysis in aqueous solutions, contribute minimally, with a half-life of approximately 50 days under sunlight exposure. Bioaccumulation of DMF in organisms is negligible, attributed to its low (log Kow) of -0.85 to -1.01, which indicates poor partitioning into lipid tissues. Experimental factors in aquatic species range from 0.3 to 1.2, confirming minimal uptake and potential for trophic . Emissions of DMF primarily occur through industrial wastewater discharges from manufacturing processes, such as synthetic leather and fiber production. In receiving rivers near such sites, DMF concentrations are typically low, often below 0.01 mg/L in heavily industrialized areas, though levels up to 0.032 mg/L have been detected in chlorinated effluents. Mitigation strategies for DMF releases emphasize biological and process optimizations to minimize environmental entry. processes in plants effectively degrade DMF, achieving up to 90% removal in adapted systems within 9 days. Following the Union's REACH restrictions implemented in December 2023, which limit DMF exposure due to concerns, alternatives such as (DMSO), often in binary mixtures with , have been promoted for industrial solvent applications to reduce reliance on DMF. Additionally, closed-loop systems enable high rates of DMF from process streams, minimizing generation and supporting sustainable practices.

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