Trimethylpentanediyl dibenzoate
[CAS# 68052-23-3]

Identification

• Classification: Organic raw materials >> Carboxylic compounds and derivatives >> Carboxylic esters and their derivatives
• Name: Trimethylpentanediyl dibenzoate
• Synonyms: (3-benzoyloxy-2,2,4-trimethylpentyl) benzoate
• Molecular Formula: C₂₂H₂₆O₄
• Molecular Weight: 354.44
• CAS Registry Number: 68052-23-3
• EC Number: 268-316-3
• SMILES: CC(C)C(C(C)(C)COC(=O)C1=CC=CC=C1)OC(=O)C2=CC=CC=C2

Properties

• Density: 1.1±0.1 g/cm³ Calc.^*, 1.075 g/mL (Expl.)
• Boiling point: 463.8±28.0 ºC 760 mmHg (Calc.)^*, 345.8 - 348.2 ºC (Expl.)
• Flash point: 226.4±22.4 ºC (Calc.)^*
• Index of refraction: 1.536 (Calc.)^*, 1.532 (Expl.)

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Discovory and Applicatios

Trimethylpentanediyl dibenzoate is an aromatic diester produced from trimethylpentanediol and benzoic acid. Its development is connected to the broader industrial investigation of benzoate esters during the twentieth century, when chemists and materials scientists were searching for additives with improved permanence, thermal stability, and compatibility compared with earlier low molecular weight esters. Rather than being attributed to a single discovery moment, trimethylpentanediyl dibenzoate emerged from systematic research into diol esterification and structure property relationships in ester based materials.

The foundation for this compound lies in the availability of branched aliphatic diols such as trimethylpentanediol, which were themselves developed to provide improved resistance to oxidation and hydrolysis relative to linear diols. When esterified with aromatic acids, these diols produced esters with higher molecular weight and increased rigidity. Benzoic acid was of particular interest because its aromatic ring imparts thermal stability and lowers volatility. Through controlled esterification reactions, trimethylpentanediyl dibenzoate was obtained as a stable, well characterized diester suitable for industrial evaluation.

Advances in esterification techniques played an important role in the practical adoption of trimethylpentanediyl dibenzoate. Improvements in catalysts, reaction temperature control, and removal of byproducts such as water allowed efficient conversion of the diol to the fully esterified product. These developments ensured consistent quality and purity, which are essential for applications in polymers and formulated products. As industrial chemistry matured, such processes became reliable enough for large scale production.

One of the primary applications of trimethylpentanediyl dibenzoate is as a plasticizer. Plasticizers are added to polymers to improve flexibility, workability, and durability. Aromatic benzoate esters were shown to provide a desirable balance between flexibility and permanence, particularly in systems where resistance to migration and evaporation is important. Trimethylpentanediyl dibenzoate, with its branched aliphatic backbone and aromatic ester groups, exhibits low volatility and good compatibility with a range of polymer matrices.

In polyvinyl chloride and related materials, trimethylpentanediyl dibenzoate has been used to impart flexibility while maintaining mechanical strength and dimensional stability. Its molecular structure allows it to interact effectively with polymer chains, reducing brittleness without excessive softening. These properties have made it suitable for applications such as films, sheets, and molded components where long term performance is required under varying temperature conditions.

Trimethylpentanediyl dibenzoate has also been applied in coatings, inks, and adhesives. In these systems, it can function as a coalescing agent or viscosity modifier, aiding film formation and improving surface properties. The aromatic nature of the benzoate groups contributes to resistance against thermal degradation during processing and curing. Its low vapor pressure helps minimize loss during application, which is advantageous in industrial coating operations.

Another area of application is in specialty lubricants and functional fluids. Ester based lubricants are valued for their lubricity and thermal stability, and aromatic esters in particular offer enhanced resistance to oxidation. Trimethylpentanediyl dibenzoate has been evaluated as a lubricant component or additive in formulations designed for elevated temperature service, where conventional mineral oils may degrade more rapidly.

In resin chemistry, trimethylpentanediyl dibenzoate has been used as a modifier to influence hardness, flexibility, and chemical resistance. When incorporated into alkyd or polyester systems, it provides a means of introducing aromatic character without significantly increasing brittleness. This has allowed formulators to fine tune performance characteristics such as gloss, durability, and resistance to solvents.

From a safety and regulatory standpoint, trimethylpentanediyl dibenzoate has been handled as a high molecular weight ester with relatively low acute toxicity under normal industrial conditions. Its established uses are based on documented performance and routine testing rather than speculative applications. Continued interest in the compound has focused on comparing its properties with those of other benzoate esters and optimizing formulations for specific end uses.

In summary, trimethylpentanediyl dibenzoate is a product of deliberate development in ester chemistry aimed at meeting industrial demands for stable and effective additives. Its origins lie in the systematic esterification of branched diols with aromatic acids, and its applications include plasticizers, coatings, lubricants, and resin modifiers. Through its combination of low volatility, thermal stability, and functional versatility, trimethylpentanediyl dibenzoate has become a well established material in applied chemical technology.

References

2018. The Chemical and Products Database, a resource for exposure-relevant data on chemicals in consumer products. Scientific Data, 5.
DOI: 10.1038/sdata.2018.125