2,2,6,6-Tetramethylpiperidin-4-yl dodecanoate
[CAS# 101238-01-1]

Identification

• Classification: Organic raw materials >> Carboxylic compounds and derivatives >> Carboxylic esters and their derivatives
• Name: 2,2,6,6-Tetramethylpiperidin-4-yl dodecanoate
• Molecular Formula: C₂₁H₄₁NO₂
• Molecular Weight: 339.56
• CAS Registry Number: 101238-01-1
• EC Number: 700-503-1
• SMILES: CCCCCCCCCCCC(=O)OC1CC(NC(C1)(C)C)(C)C

Properties

• Density: 0.9±0.1 g/cm³ Calc.^*
• Boiling point: 401.7±38.0 ºC 760 mmHg (Calc.)^*
• Flash point: 196.7±26.8 ºC (Calc.)^*
• Index of refraction: 1.472 (Calc.)^*

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

Safety Data

• Hazard Symbols: GHS07;GHS09 Warning
• Hazard Statements: H319-H400-H410
• Precautionary Statements: P264+P265-P273-P280-P305+P351+P338-P337+P317-P391-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Chronic hazardous to the aquatic environment	Aquatic Chronic	1	H410
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400

Discovory and Applicatios

2,2,6,6-Tetramethylpiperidin-4-yl dodecanoate is an ester derived from a sterically hindered piperidine alcohol and dodecanoic acid, and it belongs to a broader family of compounds known as hindered amine derivatives. These substances emerged from polymer chemistry research in the mid twentieth century, when scientists were seeking effective ways to protect plastics and coatings from degradation caused by light, heat, and oxygen. The discovery of hindered amine structures marked a significant advance in materials science because they provided stabilization mechanisms that differed from traditional antioxidants and ultraviolet absorbers.

The origins of compounds such as 2,2,6,6-tetramethylpiperidin-4-yl dodecanoate can be traced to studies on piperidine chemistry and steric hindrance. The tetramethyl substitution pattern around the piperidine ring was found to impart exceptional stability to the nitrogen-centered functional group, preventing unwanted side reactions while allowing participation in controlled radical processes. During systematic investigations of substituted piperidines, chemists recognized that esterification of the 4-hydroxy group with long-chain fatty acids, such as dodecanoic acid, improved compatibility with hydrophobic polymer matrices. This modification enhanced solubility and dispersion in plastics, which was essential for industrial applications.

As polymer production expanded rapidly after the Second World War, issues of weathering and photodegradation became increasingly important. Exposure to sunlight and air causes polymers to undergo chain scission, discoloration, and loss of mechanical properties. Research demonstrated that hindered amine compounds could effectively inhibit these processes by acting as radical scavengers. 2,2,6,6-Tetramethylpiperidin-4-yl dodecanoate was identified as a useful representative of this class because its molecular structure combined the stabilizing piperidine moiety with a flexible alkyl chain that improved processing behavior.

The principal application of 2,2,6,6-tetramethylpiperidin-4-yl dodecanoate has been as a light stabilizer in polymeric materials. It has been incorporated into polyolefins, such as polyethylene and polypropylene, as well as into coatings, adhesives, and elastomers. In these systems, the compound helps slow the formation and propagation of free radicals generated by ultraviolet radiation. Unlike simple antioxidants, hindered amine stabilizers are regenerated during the stabilization cycle, which allows them to remain effective over long service lifetimes. This characteristic has made them particularly valuable in outdoor applications where prolonged exposure is unavoidable.

Beyond plastics, the compound has also been used in surface coatings and paints. In such formulations, it contributes to resistance against chalking, cracking, and fading, thereby extending the aesthetic and functional lifetime of coated surfaces. The dodecanoate ester group enhances compatibility with organic binders and resins, reducing the risk of migration or blooming to the surface, which can otherwise compromise performance.

From a scientific standpoint, 2,2,6,6-tetramethylpiperidin-4-yl dodecanoate has served as a model compound in studies of stabilization mechanisms. Investigations into its behavior under oxidative and photochemical stress have helped clarify the role of nitroxyl radicals and related intermediates in polymer protection. These insights have guided the design of newer stabilizers with tailored molecular weights, polarities, and reactivities to meet the demands of different materials and processing conditions.

Overall, the significance of 2,2,6,6-tetramethylpiperidin-4-yl dodecanoate lies in its contribution to the durability of modern materials. By enabling plastics and coatings to withstand environmental stress over extended periods, it has supported applications ranging from packaging and construction to automotive and consumer goods. Its development reflects the broader evolution of applied organic chemistry, where detailed understanding of molecular structure has been translated into practical solutions for industrial challenges.

References

2025. Impacts of orthophosphate addition on chloramine decay and biofilm development in a model drinking water distribution system. Water Research.
DOI: 10.1016/j.watres.2025.123712

2025. Long-term impacts of free chlorine and monochloramine on the development of drinking water biofilm. Water Research.
DOI: 10.1016/j.watres.2025.123566