Description

4-Hydroxy-2,2,6,6-tetramethylpiperidine n-oxide is a stable nitroxyl radical compound, widely recognized as a key intermediate and a versatile spin trap in advanced chemical synthesis and research. Its primary value lies in its exceptional utility as a polymerization inhibitor, a catalyst component, and a probe in electron paramagnetic resonance (EPR) spectroscopy for studying free radical processes. This high-purity compound is essential for industries and research institutions focused on polymer science, material development, and analytical chemistry, where controlling radical reactions is critical.

Application

• As a highly effective polymerization inhibitor and stabilizer in the production of monomers like styrene, acrylates, and vinyl acetate.
• As a spin trap and spin label in Electron Paramagnetic Resonance (EPR) spectroscopy for detecting and studying short-lived free radicals in chemical and biological systems.
• As a key intermediate in the synthesis of Hindered Amine Light Stabilizers (HALS), which are critical additives for protecting polymers from UV degradation.
• As a catalyst or co-catalyst component in oxidation reactions and other organic transformations.
• In material science research for developing advanced polymers, coatings, and composites with enhanced stability.
• As a standard or reference compound in analytical laboratories for method development and calibration.

Basic Information

Product Name	4-Hydroxy-2,2,6,6-tetramethylpiperidine n-oxide
CAS No.	70939-25-2
Molecular Formula	C9H18NO2
Molecular Weight	172.25 g/mol
Synonyms	4-Hydroxy-TEMPO; 4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl; 4-Hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl; 4-Hydroxy-TEMPO radical; 4-Hydroxy-2,2,6,6-tetramethylpiperidinyloxy; 4-Hydroxy-2,2,6,6-tetramethylpiperidine N-oxyl; 4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl; 4-Hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy
EINECS	Contact for details

Quality Control

Our 4-Hydroxy-2,2,6,6-tetramethylpiperidine n-oxide is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC, NMR, and EPR, to ensure high purity and consistent performance. A comprehensive Certificate of Analysis (COA) detailing identity, assay, and impurity profiles is provided with every shipment to guarantee compliance with your research or production specifications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is light-sensitive (store away from light). Keep away from heat and incompatible materials.

Specification

Item	Specification
Appearance	Orange to red crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	69 - 73 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.