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Benzimidazole powder is an organic compound with the chemical formula C7H6N2, CAS 51-17-2, and is a white crystalline powder. Good chemical stability, soluble in hot water, ethanol, boiling xylene, acid and strong alkaline aqueous solutions, slightly soluble in cold water and ether, almost insoluble in benzene and petroleum ether. Benzimidazole can be used to prepare intermediate imidazole drugs such as mazalide and propiconazole for the preparation of fungicides. As a structure function tunable heterocyclic compound, its applications span across traditional industries and cutting-edge technological fields. From anti-cancer drugs to high-temperature fuel cell membranes, from metal preservatives to biomimetic enzyme catalysts, their value continues to expand as research deepens. In the future, with the development of green chemistry and nanotechnology, environmentally friendly alternatives such as biobased benzimidazole and high-performance derivatives such as porous framework materials will become research hotspots, continuing to provide support for human health and sustainable development.
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Chemical Formula |
C7H6N2 |
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Exact Mass |
118 |
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Molecular Weight |
118 |
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m/z |
118 (100.0%), 119 (7.6%) |
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Elemental Analysis |
C, 71.17; H, 5.12; N, 23.71 |
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Benzimidazole (C7H6N2), as a nitrogen-containing heterocyclic compound, has a unique chemical structure (benzene ring conjugated with imidazole ring) that endows it with extensive biological and reactive activities, making it of significant application value in fields such as medicine, pesticides, materials science, and analytical chemistry.
The biological activity of benzimidazole stems from its ability to interact with biomolecules (such as hydrogen bonding, hydrophobic interactions, π - π stacking), making it a key backbone for drug development.
1. Anti cancer drugs
BRAF inhibitor: Targeting BRAF V600E mutant cancers such as melanoma and colorectal cancer, a novel benzimidazole derivative (such as 10h) inhibits BRAF kinase activity, blocks MAPK signaling pathway, and suppresses cancer cell proliferation. The IC ₅₀ of BRAF wild-type and mutant were 1.72 μ M and 2.76 μ M, respectively, after 10 hours, and showed low toxicity to normal cells (IC ₅₀>100 μ M).
CDK inhibitor: Abemaciciclib (developed by Lilly), as a CDK4/6 inhibitor, is used to treat HR+/HER2- breast cancer and inhibit tumor growth by blocking the G1 phase of the cell cycle.
MEK inhibitor: Binimetinib (developed by Array BioPharma) targets BRAF mutant melanoma by inhibiting MEK1/2 kinase activity and blocking downstream ERK phosphorylation. It was approved for marketing by the FDA in 2018.
2. Anti parasitic and antibacterial drugs
Antituberculotic activity: Benzimidazole powder derivative 7h (1- (2-hydroxyethyl) -3- (3-methylbenzyl) benzimidazole bromide) has a MIC value of 2 μ g/mL against Mycobacterium tuberculosis H37Rv strain. It inhibits bacterial cell wall synthesis by binding to acyl acyl carrier protein reductase (InhA).
Anti polycystic kidney disease: Polyfluorosubstituted alkylbenzimidazole (such as 2-trifluoromethylbenzimidazole) generates active intermediates through C-F bond cleavage, inhibiting polycystic kidney disease related signaling pathways. The new synthesis method developed by the Xuzhou Medical University team in 2022 has obtained a national invention patent.
3. Treatment of digestive system diseases
Proton pump inhibitors (PPIs): Benzimidazole PPIs such as omeprazole and rabeprazole sodium covalently bind to H ⁺/K ⁺ - ATPase to inhibit gastric acid secretion, and are used to treat gastric ulcers and reflux esophagitis. Rabeprazole sodium has more binding sites with enzymes, faster acid inhibition rate, and long-lasting efficacy.
Gastric motility promoting drugs: Domperidone, as a peripheral dopamine D ₂ receptor antagonist, promotes gastrointestinal motility, relieves nausea and vomiting, and does not cause extravertebral reactions.
4. Treatment of cardiovascular and cerebrovascular diseases
Angiotensin II receptor 1 (AT1) antagonists: Benzimidazole antihypertensive drugs such as losartan and valsartan block the binding of angiotensin II to AT1 receptors, reducing peripheral vascular resistance and treating hypertension.
Histamine H ₁ receptor antagonists: Antiallergic drugs such as pilastatin and mizolastine relieve symptoms such as urticaria and allergic rhinitis by blocking the binding of histamine to H ₁ receptors.
Benzimidazole compounds achieve bactericidal, insecticidal, and growth regulating functions by interfering with microbial metabolism or plant physiological processes.
1. Intermediate of fungicides
Benzimidazole is a key intermediate of triazole fungicides such as Imidacloprid and Imidacloprid, used for the prevention and control of fungal diseases (such as gray mold and anthracnose) in fruit trees and vegetables. Its mechanism of action is to inhibit the synthesis of ergosterol on the fungal cell membrane.
2. Plant virus control agents
Fluorinated and nitro containing benzimidazole derivatives can inhibit the replication of plant viruses such as tobacco mosaic virus (TMV) and cucumber mosaic virus (CMV), and achieve prevention and control effects by interfering with viral RNA polymerase activity or blocking virus movement between cells.
3. Plant growth regulators
Benzimidazole compounds can mimic the effects of plant hormones such as auxin and cytokinin, promoting seed germination, root development, and fruit enlargement. For example, 2-aminobenzimidazole can increase the tiller number and thousand grain weight of rice, with a yield increase of 10% -15%.
The rigid planar structure and strong polarity of benzimidazole make it an ideal monomer for preparing high-performance polymers.
1. Polybenzimidazole (PBI)
Ultra high performance engineering plastics: PBI has excellent heat resistance (long-term use temperature>400 ℃), mechanical strength, and chemical corrosion resistance, and is used to manufacture aerospace components, semiconductor insulation layers, and fuel cell separators.
High performance fiber: PBI fiber has a limit oxygen index (LOI) of 38%, which is much higher than the flame retardant standard (LOI>26%), and is used to manufacture firefighting suits, flight suits, and nuclear protective suits.
2. Functional polymer materials
Benzimidazole powder based polymers can be used to prepare ion exchange membranes, gas separation membranes, and nanofiltration membranes. For example, PBI film serves as a proton exchange membrane in high-temperature fuel cells, with a proton conductivity of up to 0.1S/cm at 150 ℃.
Analytical Chemistry: "Sensitive Probes" for Metal Ion Detection and Complexation Titration
The coordination ability and colorimetric properties of benzimidazole make it an important reagent in analytical chemistry.
1. Metal ion detection
Cobalt ion reagent: Benzimidazole forms a red complex with cobalt ions, with a maximum absorption wavelength of 510nm, used for quantitative analysis of cobalt, with a detection limit of 0.1 μ g/mL.
Fluoride ion detection: Alizarin red S-benzimidazole complex forms a colorless complex with fluoride ions, and fluoride concentration is determined by colorimetric method with a sensitivity of 0.05mg/L.
2. Complexation titration analysis
Benzimidazole can be used as a masking agent for EDTA titration, selectively masking interfering ions such as Fe ³ ⁺ and Cu ² ⁺, and improving the titration accuracy of target ions such as Al ³ ⁺ and Zn ² ⁺.
Benzimidazole and its derivatives form a protective film by adsorbing onto metal surfaces, inhibiting the anodic oxidation and cathodic hydrogen evolution processes of corrosion reactions.
1. Carbon steel pickling corrosion inhibitor
2-Hexylbenzimidazole has a corrosion inhibition rate of 94% (50 ℃) on 20 # carbon steel in a 5% hydrochloric acid solution. Polarization curve analysis confirms that it is a mixed corrosion inhibitor.
The corrosion inhibition rate of benzimidazole propargyl sulfide on stainless steel in sulfuric acid solution exceeds 90%, and its mechanism of action is the formation of a hydrophobic protective film on the metal surface.
2. Metal surface treatment
Benzimidazole compounds can be used in chemical polishing and electroplating processes of metals such as copper and aluminum to improve surface smoothness and corrosion resistance. For example, benzimidazole formaldehyde composite polishing solution can reduce the surface roughness of copper to 0.05 μ m.
Rubber Industry: A Multi functional Additive for Vulcanization Promotion and Aging Prevention
Benzimidazole compounds can improve the processing performance and service life of rubber.
1. Vulcanization accelerator
2-mercaptobenzimidazole (MBT) is a universal accelerator for natural rubber and synthetic rubber, which can shorten the vulcanization time by 30% -50%, improve the tensile strength and wear resistance of vulcanized rubber.
2. Antioxidants
Benzimidazole anti-aging agents (such as MB) can capture free radicals generated during rubber oxidation and delay the aging process. Adding 2 parts of MB to styrene butadiene rubber can increase the thermal aging coefficient (100 ℃× 72h) from 0.6 to 0.85.
The application of benzimidazole compounds in the food and daily chemical fields must strictly comply with safety standards.
1. Food additives
Benzimidazole compounds can be used as insecticides in fermentation processes and preservatives for fruit storage. For example, 2-aminobenzimidazole can inhibit apple mold growth and extend storage life by 2-3 times.
2. Daily chemical products
Benzimidazole UV absorbers (such as UV-327) can be added to cosmetics to protect the skin from UV-A and UV-B damage. Its photostability is superior to benzone absorbents, making it suitable for outdoor product formulations.
Benzimidazole powder is an important nitrogen heterocyclic compound, which has a wide range of biological activities and pharmaceutical applications. In organic synthesis, the synthetic methods of Benzmidazole mainly include the following:
The diazonium method is one of the traditional methods for the preparation of Benzmidazole. As shown in the figure below, first react nitrobenzene with aldehydes or ketones to generate acyl-containing diazo compounds, and then use copper catalysts for Kanaiji coupling reactions to generate Benzmidazole.
The preparation of benzmidazole by the diazonium method is cumbersome, has high requirements for solvents, and the reaction conditions are relatively harsh, so it is generally not suitable for industrial production and large-scale synthesis.
The organic solvent method is an economical and convenient method for the synthesis of benzmidazole. First, phthalic acid and aminophenol are condensed by heat to generate 1,2-phenylenediamine (ie o-phenylenediamine), and then reacted by heating in an organic solvent to obtain Benzmidazole. The method does not need too many catalysts and reaction conditions, and has simple operation and high yield.
The zinc chloride method is also an important method for the preparation of Benzmidazole. By reacting halobenzene with urea, 2-halophenylurea is generated, and then undergoing a substitution reaction with a zinc chloride catalyst to generate Benzmidazole. Zinc chloride catalyst plays an important role in this reaction, which can increase the reaction rate and yield.
The metal-catalyzed method is one of the emerging methods for the preparation of Benzimidazole powder, and the commonly used metal catalysts include palladium, copper, iron and the like. Among them, palladium catalyst is widely used in the preparation of Benzmidazole. The specific method is that reactants such as p-phenylenediamine and aromatic acylformic acid are added into the reaction system, and the Benzmidazole is generated through the oxidation reaction of the palladium catalyst.
In addition, there are some other synthetic methods, such as the condensation reaction of naphthalene and urea to generate Benzmidazole and the like. Generally speaking, there are various synthetic methods of benzmidazole, and a suitable method can be selected according to different reaction conditions and reaction systems.
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