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4-Bromobenzyl chloride, molecular formula C7H6BrCl, CAS 589-17-3, corresponding molecular weight 207.48 g/mol. It is a colorless to light yellow crystal with a appearance similar to a crystalline solid. Chlorides are soluble in many organic solvents at room temperature, such as ethanol, ether, and dichloromethane. However, the solubility in water is relatively low. It is a relatively stable compound that is not easily decomposed or exploded. However, it still belongs to organic halogenated hydrocarbons and should avoid contact with strong oxidants and high temperatures. It is a commonly used aromatic halogenated hydrocarbon that can be used in numerous reactions in the organic synthesis industry. For example, it can undergo substitution reactions with other aromatic compounds to form different aromatic compounds. In addition, it can also participate as a substitute reagent in various reactions such as Grignard reaction, Suzuki coupling reaction, Heck reaction, etc. The chloride and its derivatives of this product are widely used in research and development in many pharmaceutical fields. For example, in pharmaceutical chemistry, it can be used as a precursor for synthesizing biologically active compounds. In addition, it can also serve as an intermediate for therapeutic drugs targeting diseases such as inflammation and tumors, or be used to prepare materials such as fluorescent dyes and dye sensitized solar cells.
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Chemical Formula |
C7H6BrCl |
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Exact Mass |
204 |
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Molecular Weight |
205 |
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m/z |
204 (100.0%), 206 (97.3%), 206 (32.0%), 208 (31.1%), 205 (7.6%), 207 (7.4%), 207 (2.4%), 209 (2.4%) |
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Elemental Analysis |
C, 40.92; H, 2.94; Br, 38.89; Cl, 17.25 |
4-bromobenzyl chloride (CAS number: 589-17-3), as an organic compound containing bromine and chloromethyl groups, exhibits unique application potential in the field of metal ion regulation due to its active functional groups (bromine atoms and chloromethyl groups) in its chemistry structure.
The chloromethyl group (- CH ₂ Cl) and bromine atom can be chemically modified to introduce functional groups, thereby constructing adsorption materials with high selectivity for metal ions. For example:
Synthesis of Functional Adsorption Resin
Using it as raw material, functionalized resins containing amino groups can be synthesized through the substitution reaction of chloromethyl and amine compounds. Amino groups (such as - NH ₂) have strong chelating effects on heavy metal ions (such as Cu ² ⁺, Pb ² ⁺, Cd ² ⁺), and their adsorption mechanisms may involve:
Coordination effect: The nitrogen atom in the amino group provides lone pair electrons, forming coordination bonds with metal ions.
Ion exchange: The positively charged amino groups on the resin surface electrostatically adsorb with negatively charged metal ions.
This type of resin can efficiently remove heavy metal ions in electroplating wastewater treatment, with an adsorption capacity of 100-200 mg/g (calculated as Pb ² ⁺), and can be regenerated by hydrochloric acid elution.
Preparation of Magneti Nanocomposite Materials
Magneti adsorbents can be prepared by combining organic ligands modified with 4-bromo-α-chlorotoluene with Fe3O4 nanoparticles. For example:
By the substitution reaction between chloromethyl and thiol groups (- SH), sulfur-containing ligands (such as mercaptoacetic acid) are introduced to form adsorption sites with high selectivity for Hg ² ⁺ and Ag ⁺.
The magneti separation property allows the adsorbent to be quickly recovered through an external magneti field, avoiding secondary pollution.
Experiments have shown that this type of material has an adsorption efficiency of over 95% for Hg ² ⁺, and reaches equilibrium within 10 minutes.
Its bromine atoms and chloromethyl groups can serve as reaction sites, introducing multidentate ligands through substitution reactions and coordinating with metal ions to form metal organic frameworks (MOFs) or coordination polymers. This type of material has significant value in metal ion sensing, catalysis, and separation.
Synthesis of multidentate ligands
Starting from this substance, a nitrogen-containing/oxygen-containing multidentate ligand is synthesized through the following steps:
Step 1: Chloromethyl reacts with ethylenediamine to produce an intermediate containing an amino group.
Step 2: The amino group reacts with phthalic anhydride to form a multidentate ligand containing amide and carboxylic acid groups.
This type of ligand can coordinate with transition metal ions such as Zn ² ⁺ and Cu ² ⁺ to form MOF materials with pore structures.
Application of metal ion sensing
MOFs materials containing 4-bromobenzyl chloride derivatives can detect metal ions through fluorescence quenching effect. For example:
Fluorescent ligands modified with 4-bromo-α-chlorotoluene coordinate with Eu ³ ⁺ to form luminescent MOFs.
When Fe ³ ⁺ is present in the solution, it binds to the carboxylic acid group in the ligand, resulting in a significant decrease in fluorescence intensity, with a detection limit of up to 0.1 μ M.
4-Bromo-α-chlorotoluene and its derivatives can adjust the electronic state or steric hindrance of metal ions through interaction with metal catalysts, thereby optimizing the selectivity and activity of catalytic reactions.
Ligand modification in homogeneous catalysis
In palladium catalysis (such as Suzuki coupling), the derived phosphine ligands can regulate the catalytic performance of Pd ² ⁺ in the following ways:
Electronic effect: The electron donating groups (such as amino groups) in the ligand can increase the electron density of Pd ² ⁺, promoting the oxidative addition step.
Space effect: Large steric hindrance groups (such as tert butyl) in ligands can inhibit side reactions and improve regioselectivity.
Experiments have shown that the yield of Suzuki coupling can be increased from 60% to 90% when using phosphine ligands derived from 4-bromo-α-chlorotoluene.
Functionalization of Carriers in Heterogeneous Catalysis
A supported metal catalyst can be prepared by loading an organic ligand modified with 4-bromo-α-chlorotoluene onto the surface of alumina (Al ₂ O3) or silica (SiO ₂). For example:
By reacting chloromethyl with silane coupling agent, amino containing ligands are immobilized on the surface of SiO ₂.
After loading Pd nanoparticles, the catalyst showed higher activity (TOF value increased by 2 times) and stability (activity remained at 90% after 5 cycles of use) in the nitrobenzene hydrogenation reaction.
This substance and its derivatives can reduce the mobility and bioavailability of heavy metal ions in the environment through chemistry fixation or reduction precipitation.
Remediation of heavy metal contaminated soil
Injecting sulfides modified with 4-bromo-α-chlorotoluene (such as dithiocarbamate) into polluted soil can fix heavy metals through the following mechanism:
Precipitation: Sulfides react with Pb ² ⁺ and Cd ² ⁺ to form insoluble sulfide precipitates (such as PbS and CdS).
Adsorption effect: The amino or carboxylic acid groups in the modified group can further adsorb residual metal ions.
Field experiments have shown that such materials can reduce the available content of Pb ² ⁺ in soil by more than 80%.
Zero valent iron reduction of industrial wastewater
In systems containing 4-bromo-α-chlorotoluene derivatives, zero valent iron (ZVI) can precipitate heavy metals through reduction:
The humic acid modified with 4-bromo-α-chlorotoluene can promote the reduction of Cr (VI) by ZVI and generate Cr (III) precipitate.
The functional groups in the modifier can inhibit the formation of oxide film on the surface of ZVI and increase the reaction rate (k value increased by 3 times).
Potential Applications and Future Directions: Innovation Driven Expansion
Although the direct application of 4-bromobenzyl chloride in metal ion regulation is still in its infancy, its multifunctional chemistry structure provides research opportunities in the following fields:
Extraction of Metal Ions from Ionic Liquids
Ionic liquids containing imidazole rings can be synthesized using 4-bromobenzyl chloride as raw material, and metal ions (such as Co ² ⁺, Ni ² ⁺) can be extracted by anion exchange. Preliminary experiments have shown that the distribution ratio of Co ² ⁺ in this type of ionic liquid can reach over 100.
Electron Transfer in Bioelectrochemical Systems
Conductive polymers modified with 4-bromobenzyl chloride, such as polypyrrole, can be used as electrode materials to construct efficient bio batteries through redox reactions with metal ions, such as Fe ³ ⁺/Fe ² ⁺. Simulation calculations show that the electron transfer rate constant (k ₀) of the modified electrode can be increased by an order of magnitude.
Metal ion regulation in nanoenzymes
Fixing the ligand modified with 4-bromobenzyl chloride on the surface of gold nanoparticles can optimize the peroxidase activity of the nanoenzyme by adjusting the strength of the Au-S bond. Experiments have shown that the modified nanoenzyme can increase the catalytic efficiency (kcat/Km) of H ₂ O ₂ by 5 times.
The following are the detailed steps and chemistry reaction equations of common laboratory synthesis methods for 4-Bromobenzyl chloride:
This synthesis method involves two main reactions: Foucault alkylation reaction and chlorination reaction. The following is an example of a possible chemistry reaction equation:
BrC6H4OH + CHCl3 → C6H4OCH2Cl + HBrC6H4OH + Cl2 → C6H4OCH2Cl + HBr + HCl
1. Prepare the required raw materials:
Raw materials: 4-Bromophenol and Chloroform.
2. Synthesis method:
(1) Add 4-bromophenol and chloroform to anhydrous aluminum trichloride, mix well, and then add to a reaction flask with a stirring device, thermometer, and condenser.
(2) Under stirring, raise the temperature inside the reaction bottle to about 60 ℃, stop heating, keep the temperature constant, and continue stirring.
(3) During the reaction process, it can be observed that the reaction solution gradually turns reddish brown, indicating that the Friedelmann alkylation reaction has begun. At this point, it is necessary to continue to maintain the reaction temperature at around 60 ℃ and closely monitor the changes in the reaction solution.
(4) When the reaction liquid becomes clear, it indicates that the Friedrichen Crafts alkylation reaction has been basically completed. At this point, it is necessary to gradually cool the reaction solution to below room temperature.
(5) Wash the reaction solution with a dilute hydrochloric acid aqueous solution and neutralize it with sodium hydroxide aqueous solution to Ph7-8. During the neutralization process, it is necessary to pay attention to controlling the pH value of the solution to avoid situations where the pH value is too low or too high.
(6) Distill the reaction solution under reduced pressure to separate 4-bromophenylmethane. In the process of vacuum distillation, it is necessary to pay attention to controlling temperature and vacuum degree to ensure the purity and yield of the product.
(7) Perform a chlorination reaction between the obtained 4-bromophenylmethane and chlorine gas under light conditions.
(8) After the reaction is completed, it is necessary to wash the reaction solution with a dilute hydrochloric acid aqueous solution and neutralize it with a sodium hydroxide aqueous solution to Ph7-8. During the neutralization process, it is also necessary to pay attention to controlling the pH value of the solution.
(9) Distill the reaction solution under reduced pressure to separate 4-bromobenzyl chloride. In the process of vacuum distillation, it is also necessary to pay attention to controlling temperature and vacuum degree to ensure the purity and yield of the product.
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