1,3,5-Trichloro-2-(chloromethyl)benzene: Properties & Uses
1,3,5-Trichloro-2-(chloromethyl)benzene: Properties & Uses
1,3,5-Trichloro-2-(chloromethyl)benzene is a polychlorinated aromatic compound featuring a reactive benzyl chloride moiety that serves as a versatile electrophilic building block in organic synthesis.
- IUPAC Name
- 1,3,5-Trichloro-2-(chloromethyl)benzene
- Molecular Formula
- C7H4Cl4
- Molecular Weight
- 230.92 g/mol
- Functional Class
- Benzyl chloride / Polychlorinated arene
- Primary Application
- Electrophilic alkylating agent and synthetic intermediate
- Aladdin SKU
- T690931
Chemical Identity and Structure
1,3,5-Trichloro-2-(chloromethyl)benzene (CAS registry; MW 230.92 g/mol; molecular formula C7H4Cl4) is a symmetrically substituted chlorinated arene bearing three ring chlorine atoms at the 1, 3, and 5 positions and a chloromethyl (–CH2Cl) group at the 2 position. The three ring-chlorine substituents exert a strong combined electron-withdrawing inductive effect on the aromatic system, while the exocyclic chloromethyl group provides a site of high electrophilic reactivity characteristic of benzyl halides. This combination of features distinguishes the compound from simpler benzyl chlorides and makes it a structurally rigid, sterically defined scaffold for further functionalization.
The compound is a solid at ambient temperature and should be handled under standard precautions applicable to reactive organochlorine reagents, including avoidance of moisture and use of appropriate personal protective equipment.
Reactivity and Synthetic Utility
The benzyl chloride functionality in 1,3,5-Trichloro-2-(chloromethyl)benzene undergoes nucleophilic substitution reactions (SN2 and, under stabilizing conditions, SN1) with a broad range of nucleophiles including amines, thiols, alcohols, azides, and carbanions. This reactivity is fundamental to its role as a coupling or tethering agent in multi-step synthesis. The electron-withdrawing ring chlorines moderately stabilize the transition state and influence the rate of displacement relative to unsubstituted benzyl chlorides.
In addition, the aryl chloride bonds present on the ring are accessible to transition-metal-catalyzed cross-coupling reactions such as Suzuki–Miyaura, Negishi, and Buchwald–Hartwig protocols, enabling construction of complex biaryl or heteroaryl architectures from a single polyfunctional starting material. Researchers have employed polychlorinated benzyl chloride scaffolds as precursors to macrocyclic frameworks, dendritic molecules, and functionalized polymers.
Handling, Storage, and Safety Considerations
As with all benzyl chloride derivatives, 1,3,5-Trichloro-2-(chloromethyl)benzene should be handled in a well-ventilated fume hood. Skin and eye contact must be avoided; nitrile gloves, safety glasses, and a laboratory coat are the minimum recommended personal protective equipment. The compound is moisture-sensitive; prolonged exposure to humid air can lead to slow hydrolysis of the chloromethyl group to the corresponding benzyl alcohol and generation of HCl.
Store the reagent in a tightly sealed container in a cool, dry location away from bases, strong nucleophiles, and reducing agents. Compatibility with local regulations governing the storage and disposal of halogenated organic waste should be confirmed before use. Always consult the current Safety Data Sheet (SDS) provided by Aladdin Scientific for authoritative hazard, first-aid, and disposal information.
Ordering and Specifications
Aladdin Scientific supplies 1,3,5-Trichloro-2-(chloromethyl)benzene under SKU T690931. Researchers requiring precise purity data, certificate of analysis, NMR spectra, or bulk quantities are encouraged to contact Aladdin Scientific's technical sales team. Standard lot-specific certificates of analysis are available upon request and confirm identity, purity, and appearance for each batch released.
For procurement teams, the compound is catalogued under the reagent grade suitable for research and development purposes. Aladdin Scientific's quality management procedures ensure consistent batch-to-batch reproducibility to support method development and scale-up activities.
Frequently asked questions
What nucleophiles react efficiently with 1,3,5-Trichloro-2-(chloromethyl)benzene?
The benzyl chloride group readily undergoes Sₙ2 displacement with soft and hard nucleophiles alike, including primary and secondary amines, thiols, sodium azide, alkoxides, and stabilized carbanions (e.g., malonates). Reaction conditions such as solvent polarity, temperature, and base choice should be optimized for each nucleophile class.
Can the aryl chloride bonds in this compound be used in cross-coupling reactions?
Yes. The three aryl C–Cl bonds are amenable to palladium- or nickel-catalyzed cross-coupling reactions such as Suzuki–Miyaura (with arylboronic acids), Negishi (with organozinc reagents), and Buchwald–Hartwig amination, enabling selective or exhaustive coupling depending on catalyst loading and ligand choice. Selective mono- or bis-coupling can be achieved by controlling stoichiometry and reaction conditions.
How should 1,3,5-Trichloro-2-(chloromethyl)benzene be stored to maintain stability?
The compound should be stored in a tightly sealed container under dry conditions, away from moisture, bases, and strong nucleophiles. Refrigerated storage (2–8 °C) in an inert atmosphere is recommended for long-term preservation. Always refer to the Aladdin Scientific SDS for specific storage conditions applicable to your lot.
What is the difference between the ring chlorines and the chloromethyl chlorine in terms of reactivity?
The chloromethyl (benzylic) chlorine is far more reactive toward nucleophilic substitution than the aryl chlorines due to the lower energy of the Sₙ2 transition state at sp³ carbon and the availability of benzylic stabilization in Sₙ1 pathways. The aryl chlorines, in contrast, require activation by metal catalysis or strongly electron-withdrawing conditions for substitution and are the preferred handles for transition-metal cross-coupling chemistry.
References
- March, J.; Smith, M. B. March's Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 7th ed.; Wiley: Hoboken, NJ, 2013.
- Johansson Seechurn, C. C. C.; Kitching, M. O.; Colacot, T. J.; Snieckus, V. Palladium-Catalyzed Cross-Coupling: A Historical Contextual Perspective to the 2010 Nobel Prize. Angew. Chem. Int. Ed. 2012, 51, 5062–5085. doi:10.1002/anie.201107017
- Aladdin Scientific. Product Page: 1,3,5-Trichloro-2-(chloromethyl)benzene, SKU T690931. Aladdin Scientific, Shanghai.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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