Chemical Structure and Physical Properties

1,3,5-Tris(chloromethyl)-2,4,6-trimethylbenzene (SKU: T697176) is derived from mesitylene (1,3,5-trimethylbenzene) through exhaustive benzylic chlorination of all three methyl substituents. The resulting compound features a highly symmetrical, C_3v-symmetric aromatic core with alternating chloromethyl (–CH₂Cl) and methyl groups around the ring.

The molecular formula is C₁₂H₁₅Cl₃ with a molecular weight of approximately 309.66 g/mol. The three benzylic C–Cl bonds are activated by the adjacent aromatic ring, rendering them significantly more reactive toward nucleophilic substitution (S_N2 and S_N1 pathways) than typical alkyl chlorides. The compound is typically a white to off-white crystalline solid at room temperature.

Note: Specific melting point, solubility, and density values should be confirmed against the current Aladdin Scientific Certificate of Analysis for lot-specific data.

Synthesis and Reactivity

The compound is classically prepared by free-radical or acid-catalyzed benzylic chlorination of mesitylene using chlorinating agents such as sulfuryl chloride (SO₂Cl₂) or molecular chlorine (Cl₂) under UV irradiation. Controlling reaction stoichiometry and conditions is essential to achieve full trichlorination rather than partial chlorination products.

The three –CH₂Cl groups are highly electrophilic and participate readily in:

• Nucleophilic substitution: Reaction with amines, thiols, alcohols, carboxylates, and other nucleophiles to install diverse functional groups.
• Friedel–Crafts alkylation: In the presence of Lewis acid catalysts, the benzylic chlorides can alkylate electron-rich aromatic systems.
• Polymer crosslinking: The trifunctional nature allows simultaneous reaction with three nucleophilic sites, enabling the formation of network polymers and crosslinked materials.

Due to its symmetrical trifunctionality, the reagent is particularly useful for constructing three-armed star-shaped molecules, macrocycles, cages, and porous organic frameworks.

Applications in Research and Materials Science

1,3,5-Tris(chloromethyl)-2,4,6-trimethylbenzene serves as a versatile C₃-symmetric platform in multiple research domains:

• Supramolecular chemistry: Used as a tripodal scaffold for the synthesis of macrocycles, cryptands, and molecular cages through multi-component condensation reactions.
• Porous organic polymers (POPs): Acts as a trifunctional knot monomer in Friedel–Crafts or nucleophilic polycondensation to produce hypercrosslinked polymers and covalent organic networks with high surface areas.
• Dendrimer and star-polymer synthesis: The three reactive sites serve as branch points for constructing dendritic or star-shaped macromolecular architectures.
• Functionalized materials: Introduction of –CH₂Cl groups onto polymer backbones or surfaces using this reagent as a model enables subsequent post-modification with a wide range of nucleophiles.
• Coordination chemistry: Precursor to tris-phosphine, tris-amine, and tris-thiol ligands used in metal complex synthesis.

The high symmetry and rigidity of the mesitylene core help impose defined geometry in the resulting structures, a valuable feature in crystal engineering and self-assembly research.

Safety, Storage, and Handling

As a polyfunctional benzylic chloride, 1,3,5-Tris(chloromethyl)-2,4,6-trimethylbenzene should be handled with appropriate precautions:

• Irritant/lachrymatory potential: Benzylic chlorides are known lachrymatory agents and skin/mucous membrane irritants. Handle in a well-ventilated fume hood with appropriate personal protective equipment (gloves, safety glasses, lab coat).
• Moisture sensitivity: The –CH₂Cl groups may undergo slow hydrolysis on prolonged exposure to moisture. Store under dry conditions, ideally in a sealed container with desiccant.
• Storage temperature: Store at room temperature or as specified on the product label, away from incompatible nucleophiles, bases, and oxidizers.
• Disposal: Dispose of according to local regulations for halogenated organic waste.

Important: Always consult the current Safety Data Sheet (SDS) provided by Aladdin Scientific (SKU T697176) before use. Specific hazard classifications, GHS pictograms, and first-aid measures are detailed in the SDS.