Synthesis and Chemical application of 1,3,5-Benzenetricarboxaldehyde

1,3,5-Benzenetricarboxaldehyde generally appears as a white to off‑white solid powder, exhibiting physicochemical properties similar to benzaldehyde and possessing high chemical reactivity. It is soluble in hot water, alcoholic solvents, and ethyl acetate. Primarily used as an organic synthetic intermediate, 1,3,5-Benzenetricarboxaldehyde leverages the high reactivity of its aldehyde groups for applications in the synthesis of dendrimers, covalent organic frameworks (COFs), organic molecular cages, and related compounds, playing a significant role in fundamental organic chemistry research.

Synthesis

Method 1

A literature report describes a method for synthesizing 1,3,5-Benzenetricarboxaldehyde, which involves the oxidation of trimethylolbenzene to 1,3,5-Benzenetricarboxaldehyde using chromate or dichromate as the oxidant under phase-transfer catalytic conditions. Compared with existing synthetic methods, this invention offers mild reaction conditions, simple operation, low production cost, high product yield, and is suitable for large-scale industrial production.[1]

Method 2

A study reported a method for preparing 1,3,5-Benzenetricarboxaldehyde from Wenle’s amide. The process involves first synthesizing 1,3,5-(N-alkyl-N-alkoxy)benzene tricarboxamide, which is then reduced with a reducing agent to obtain 1,3,5-Benzenetricarboxaldehyde. This reaction is operationally safe, features straightforward steps, yields a single product, and simplifies post-reaction workup, thereby providing favorable conditions for industrial-scale production and commercialization. Moreover, the production process avoids the use of highly toxic reagents and precious metal catalysts, generates minimal pollutant discharge, is environmentally friendly, and aligns with national industrial policies. [2]

Condensation Reaction

Figure1: Condensation Reaction of 1,3,5-Benzenetricarboxaldehyde

In a screw‑capped reactor, o‑iodoaniline (0.5 mmol), 1,3,5-Benzenetricarboxaldehyde (0.3 mmol), selenium powder (3.76 mmol), Cs₂CO₃ (2.52 mmol), and dry DMF (3 mL) were combined. The reactor was sealed and the mixture was stirred at 145–150 °C for 24 h. After cooling to room temperature, the mixture was diluted with ice‑cold water (10 mL) and extracted twice with ethyl acetate (2 × 20 mL). The combined organic layers were dried over anhydrous Na₂SO₄, concentrated under vacuum, and the residue was purified by column chromatography using an ethyl acetate/hexane mixture as eluent to afford 1,3,5‑tris(benzo[d][1,3]selenazol‑2‑yl)benzene.[3]

Chemical application

Preparation of self‑healing styrene‑butadiene rubber

A research study reported a method for preparing self‑healing styrene‑butadiene rubber (SBR). The process first involves synthesizing lipoic acid hydrazide, which is then mixed with SBR to obtain hydrazide‑functionalized SBR. Subsequently, 1,3,5-Benzenetricarboxaldehyde is added, and the pH of the solution is adjusted to 5–7 using glacial acetic acid to cure the SBR, yielding a rubber material containing reversible acylhydrazone bonds. The reported synthetic approach provides a novel cross‑linking strategy for rubber: lipoic acid can be converted into lipoic hydrazide, and the disulfide (S‑S) bond in the hydrazide can cleave and react with the vinyl groups in SBR, thereby introducing hydrazide linkages into the rubber matrix. Upon addition of 1,3,5-Benzenetricarboxaldehyde, the aldehyde groups react with the hydrazide to form acylhydrazone bonds, leading to the cured SBR. This experimental method is simple, proceeds under mild conditions, and enables the self‑healing of SBR at room temperature through pH adjustment. [4]

Preparation of nitrogen‑rich porous organic polymers

Researchers have reported a method for synthesizing nitrogen‑rich porous organic polymers, characterized by the following steps: under ambient temperature and pressure, 1,3,5-Benzenetricarboxaldehyde and pararosaniline base are placed in a reaction vessel, followed by the addition of 1,4‑dioxane under sonication. An aqueous acetic acid solution is then added dropwise until a gel is fully formed. After reacting for 12‑36 hours, the product is subjected to suction filtration and Soxhlet extraction, and then dried in a vacuum oven to obtain a nitrogen‑rich porous organic polymer powder. The synthesis method described in this patent, which employs 1,3,5-Benzenetricarboxaldehyde as a key building block, is simple to operate under varying temperature conditions. The resulting polymer exhibits a wide range of potential applications, including energy‑storage material carriers, gas adsorption, and supercapacitors, demonstrating promising prospects in these fields. [5]

Reference

[1] Wei, J. F.; Su, H. Y.; Li, L.; et al. A method for synthesizing trimethylolbenzene compounds: CN 201310202533[P].

[2] Yang, F. Z.; Xu, M.; Xia, M.; et al. A method for preparing trimethylolbenzene from Wenle’s amide: CN202011532300.6[P].

[3] Tian, Y. Z.; Luo, Z.; Lyu, Q.; et al. A method for preparing self?healing styrene?butadiene rubber: CN202011159622.0[P].

[4] Deka, Snata ; et al, Exploration of Solvent-Controlled Reactive Intermediates in the Synthesis of Aryloselenazoles: Altered Chalcogen Bonding Interactions, Chemistry - An Asian Journal 2025, 20, e202500477.

[5] Liao, Y. Z.; Li, J. H.; Li, H. M. A method for synthesizing nitrogen?rich porous organic polymers: CN201711118219.1[P].

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