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5-Chloro-2-nitrotoluene is an organic compound with the chemical formula C7H6ClNO2. White to light yellow crystals or powder. Insoluble in water, soluble in organic solvents such as ethanol, ether, chloroform, etc. This compound is a commonly used intermediate in organic synthesis, used for synthesizing organic compounds such as pesticides, dyes, and drugs. Showcasing its special applications in other fields. For example, in the rubber industry, it can serve as a rubber additive to improve the processing and physical properties of rubber; In the field of metal surface treatment, it can serve as a corrosion inhibitor to prevent corrosion of metals during processing and storage; In photographic photosensitive materials, it can be used as a precursor for photosensitive agents to improve the sensitivity and clarity of photosensitive materials. It also demonstrates its unique value in the field of pesticide production. Some pesticides made from this substance have the characteristics of high efficiency, low toxicity, and broad spectrum, which are of great significance for the prevention and control of crop diseases and pests. The application of these pesticides in agricultural production not only improves the yield and quality of crops, but also reduces pollution and damage to the environment.
|
Chemical Formula |
C7H6ClNO2 |
|
Exact Mass |
171 |
|
Molecular Weight |
172 |
|
m/z |
171 (100.0%), 173 (32.0%), 172 (7.6%), 174 (2.4%) |
|
Elemental Analysis |
C, 49.00; H, 3.52; Cl, 20.66; N, 8.16; O, 18.65 |
The application of 5-chloro-2-nitrotoluene in the construction of complex structural compounds has indeed demonstrated its unique value and potential. As an organic compound with specific chemical properties, the chlorine atoms and nitro functional groups in its molecular structure endow it with unique reactivity and diversity. This plays a crucial role in the construction of complex structured compounds.
1. Synthesis of Drug Intermediates
In the process of drug development, the synthesis of drug intermediates is a crucial step. Due to its unique chemical properties, it is widely used in the synthesis of pharmaceutical intermediates. For example, it can serve as a starting material to synthesize drug intermediates with specific biological activity through a series of reaction steps. After further transformation of these intermediates, new drugs with therapeutic effects or improvements in the efficacy of existing drugs can be obtained.
In the process of drug synthesis, the nitro functional group of the substance can be converted into other functional groups such as amino and hydroxyl groups through reactions such as reduction and acylation. The presence of these functional groups gives drug molecules better biological activity and stability. According to relevant research reports, some derivatives of product have shown significant pharmacological effects in antibacterial, anti-inflammatory, analgesic, and other aspects.
2. Synthesis of natural products
Natural products are compounds with specific biological activities produced within living organisms, which have wide applications in fields such as medicine, pesticides, and food. However, the synthesis of natural products often faces problems such as complex structures and harsh reaction conditions. It as a compound with special chemical properties, provides new ideas and methods for the synthesis of natural products.
By utilizing the reactivity of the chlorine atom and nitro functional group of product, multiple synthesis routes can be designed for the synthesis of complex natural products. For example, in the synthesis of certain natural products, the product can be used as the starting material to gradually construct the skeleton structure of the target molecule through specific reaction steps. This method not only simplifies the synthesis steps, but also improves the purity and yield of the target molecule.
3. Development of Fluorescent Materials
Fluorescent materials are a class of compounds with special optical properties, which have broad application prospects in the field of optoelectronics. As a compound with a special structure, it is widely used in the development of fluorescent materials.
It can be converted into compounds with specific fluorescence properties through specific chemical reactions. These compounds can emit strong fluorescence signals under UV or visible light irradiation. Therefore, they are widely used in fields such as fluorescent probes and fluorescent sensors. Meanwhile, these fluorescent materials can also be used to prepare high-performance light-emitting devices, such as organic light-emitting diodes (OLEDs).
The following are three common synthetic routes of 5-Chloro-2-nitrotoluene and their detailed steps:
01
Chlorinated 2-methyl-1-aminobenzene (o-methylaminochlorobenzene), then nitrated with sodium nitrite to obtain 5-chloro-2-nitroaniline, and finally obtained 5-chloro- 2-nitrotoluene, and then by reducing nitro to amino, chlorination again to obtain 5-chloro-2-aminotoluene, and finally nitration to obtain the target product.
Step 1:
Chlorinate 2-methyl-1-aminobenzene and imidic acid into 2-chloro-1-methylbenzene (o-methylaminochlorobenzene) in the presence of hydrochloric acid.
Step 2:
Nitrate 2-chloro-1-methylbenzene to 5-chloro-2-nitroaniline in the presence of sodium nitrite.
Step 3:
Reaction with methylmagnesium chloride in methanol to obtain 5-methoxy-2-nitrotoluene.
Step 4:
Methylate 5-methoxy-2-nitrotoluene to 5-methyl-2-nitrotoluene with sodium hydroxide/copper hydroxide/ammonia water mixture.
Step 5:
Use sodium sulfite to reduce 5-methyl-2-nitrotoluene to 5-amino-2-methyltoluene.
Step 6:
Chloride 5-amino-2-methyltoluene with hydrochloric acid to obtain 5-chloro-2-aminotoluene.
Step 7:
Nitrate 5-chloro-2-aminotoluene with nitric acid to obtain the target product.
2.
02
React 2-nitro-5-chlorotoluene with dilute hydrochloric acid, then reduce the nitro group to amino with sodium sulfite, chlorinate again to obtain 5-chloro-2-aminotoluene, and finally obtain the target product 5- Chloro-2-nitrotoluene.
detailed steps:
Step 1:
In the presence of cuprous chloride, react 2-methyl-1-aminobenzene with sodium nitrite to obtain 2-nitro-5-methylbenzene (o-methylaminonitrobenzene).
Step 2:
Methylate 2-nitro-5-methylbenzene to 2-methyl-5-methylaniline with sodium hydroxide/copper hydroxide/ammonia water mixture.
Step 3:
In the presence of dilute hydrochloric acid, chlorinate 2-methyl-5-methylaniline to 2-chloro-5-methylaniline.
Step 4:
Use sodium sulfite to reduce the nitro group of 2-chloro-5-methylaniline to amino group to obtain 5-amino-2-methylbenzene.
Step 5:
Chloride 5-amino-2-methylbenzene with hydrochloric acid to obtain 5-chloro-2-methylbenzene.
Step 6:
In the presence of sodium nitrite, nitrate 5-chloro-2-methylbenzene to 5-chloro-2-nitrotoluene.
03
Preparation of the target product by hydrogen oxidation under the catalysis of 2-chloro-5-nitrotoluene and sulfuric acid.
detailed steps:
Step 1:
In the presence of hydrochloric acid, use sodium nitrite to nitrate 2-methyl-5-aminotoluene to 2-nitro-5-aminotoluene (o-aminonitrobenzene).
Step 2:
In the presence of dilute hydrochloric acid, chlorinate 2-nitro-5-aminotoluene to 2-chloro-5-aminotoluene.
Step 3:
Under the catalysis of sulfuric acid, react 2-chloro-5-aminotoluene with sodium hydroxide to obtain 2-chloro-5-aminocresol.
Step 4:
Nitrate 2-chloro-5-aminocresol to product with a mixture of nitric acid and sulfuric acid.
Distribution characteristics of atypical environments
5-Chloro-2-Nitrotoluene (CAS number: 5367-28-2) is an important organic synthetic intermediate widely used in the fields of dyes, pharmaceuticals, pesticides, and polymer materials. The chlorine atoms and nitro groups in its molecular structure endow it with unique chemical activity, but at the same time, it also exhibits significant persistence and mobility in the environment. In recent years, with the expansion of industrial production and the intensification of environmental pollution problems, the distribution characteristics of this substance in atypical environments (such as remote areas, groundwater systems, sediments, and organisms) have gradually attracted attention. The following is its detailed explanation:
Distribution characteristics in atypical environments
Distribution in atmospheric environment
Industrial emission source: During the production, use, and waste treatment of 5-chloro-2-nitrotoluene, it may be released into the atmosphere, forming gaseous or particulate pollutants.
Long distance transmission: Due to its volatility and atmospheric stability, 5-chloro-2-nitrotoluene can be transported to remote areas through atmospheric circulation. For example, trace amounts of 5-chloro-2-nitrotoluene have been detected in snow samples from the Arctic region, indicating its global transport potential.
Dry and wet deposition: It becomes an important pathway for regional pollution by entering surface water bodies or soil through precipitation or particulate matter deposition.
Distribution in water bodies and sediments
Surface water pollution: Industrial wastewater discharge is the main pathway for 5-chloro-2-nitrotoluene to enter water bodies. Due to its low water solubility, it mainly exists in the form of dissolved or adsorbed suspended particles in water.
Groundwater pollution: In areas with high soil permeability, 5-Chloro-2-Nitrotoluene may enter the groundwater system through leaching. Research has shown that its migration rate in groundwater is slow, but it can remain in aquifers for a long time.
Sediment enrichment: Due to its high adsorption capacity for sediment, 5-chloro-2-nitrotoluene is prone to enrichment in river, lake, and marine sediments. For example, in the sediment of a river near a chemical plant, the concentration of 5-chloro-2-nitrotoluene can reach several hundred mg/kg, far higher than the concentration in the water.
Distribution in soil environment
Pollution sources: Industrial waste disposal, pesticide use, and accidental spills are the main sources of soil pollution.
Vertical migration: 5-Chloro-2-nitrotoluene has weak migration ability in soil and is mainly distributed in surface soil (0-20 cm). However, in sandy soils or highly permeable areas, it may migrate downwards to deeper layers.
Durability: Due to poor biodegradability, the half-life of 5-chloro-2-nitrotoluene in soil can reach several years or even decades, leading to long-term pollution risks.
Distribution and bioaccumulation within living organisms
Food chain transmission: 5-Chloro-2-nitrotoluene can be transmitted through the soil plant animal or water planktonic fish food chain and enriched in organisms. For example, in fish in polluted waters, the concentration of 5-chloro-2-nitrotoluene can reach thousands of times that of water.
Bioaccumulation: Due to its lipophilicity, 5-Chloro-2-Nitrotoluene is prone to accumulate in biological adipose tissue, posing a potential threat to high trophic level organisms such as birds and mammals.
Toxic effects: Animal experiments have shown that 5-chloro-2-nitrotoluene can cause toxic damage to the liver, kidneys, and nervous system, and long-term exposure may lead to reproductive toxicity and carcinogenicity.
Monitoring data of atypical environmental distribution
Global monitoring data
Arctic region
5-Chloro-2-nitrotoluene was detected in Arctic snow samples at concentrations ranging from 0.1-1.0 ng/L, indicating its ability to be transported over long distances through the atmosphere to remote areas.
Surrounding a chemical plant in China
In polluted river sediments, the concentration of 5-chloro-2-nitrotoluene reached 350 mg/kg, far exceeding the background value.
European groundwater monitoring
5-Chloro-2-nitrotoluene was detected in groundwater of an industrial area in Germany, with a concentration of 0.5-2.0 μ g/L, indicating that it has caused pollution to the groundwater system.
Influencing factors of atypical environmental distribution
Characteristics of environmental media
Soil type: Soil with high clay and organic matter content has strong adsorption capacity for 5-chloro-2-nitrotoluene, which limits its migration.
PH value of water: Under acidic conditions, the solubility of 5-chloro-2-nitrotoluene may increase, promoting its migration in water.
Weather
Temperature: High temperature can accelerate the volatilization and photolysis of 5-chloro-2-nitrotoluene, but it may also increase its stability in the atmosphere.
Precipitation: Heavy precipitation events can promote the dry and wet deposition of 5-chloro-2-nitrotoluene, accelerating its transfer from the atmosphere to the surface environment.
human activity
Industrial emissions: Chemical, dye, and pesticide production are the main sources of 5-chloro-2-nitrotoluene emissions.
Agricultural activities: The use of pesticides containing 5-chloro-2-nitrotoluene may lead to soil and water pollution in farmland.
Ecological Risks and Control Strategies of Atypical Environmental Distribution
Ecological risk assessment
Acute toxicity: 5-Chloro-2-nitrotoluene has high toxicity to aquatic organisms such as fish and algae, with LC ₅₀ values typically in the mg/L range.
Chronic toxicity: Long term exposure can lead to growth inhibition, decreased reproductive capacity, and genetic toxicity.
Bioaccumulation effect: Accumulation in the food chain may pose a higher risk to high trophic level organisms.
Control strategy
Source control: Promote clean production technology to reduce the production and use of 5-chloro-2-nitrotoluene; Strengthen the treatment of industrial wastewater and exhaust gas to reduce emissions.
Environmental monitoring: Establish a long-term monitoring network to track the distribution and trends of 5-chloro-2-nitrotoluene in the environment.
Remediation techniques: For contaminated soil and groundwater, physical (such as thermal desorption), chemical (such as redox), and biological (such as microbial degradation) remediation techniques can be used.
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