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CAS RN: 2226-96-2 | Product Number: H0865

4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-Oxyl Free Radical

Purity: >98.0%(GC)
  • 4-Hydroxy-TEMPO Free Radical
  • TEMPOL Free Radical
61,00 €
6   ≥40 
205,00 €
5   ≥40 

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Product Number H0865
Purity / Analysis Method >98.0%(GC)
Molecular Formula / Molecular Weight C__9H__1__8NO__2 = 172.25 
Physical State (20 deg.C) Solid
Store Under Inert Gas Store under inert gas
Condition to Avoid Light Sensitive,Hygroscopic
CAS RN 2226-96-2
Reaxys Registry Number 11328213
PubChem Substance ID 87571222
Merck Index (14) 9141
MDL Number


Appearance Light yellow to Brown powder to lump
Purity(GC) min. 98.0 %
Purity(Iodometric Titration) min. 97.0 %
Melting point 69.0 to 75.0 °C
Solubility in Methanol very faint turbidity
Properties (reference)
Melting Point 72 °C
Solubility in water Soluble
Solubility (soluble in) Methanol
Pictogram Pictogram
Signal Word Warning
Hazard Statements H302 : Harmful if swallowed.
H315 : Causes skin irritation.
H319 : Causes serious eye irritation.
Precautionary Statements P501 : Dispose of contents/ container to an approved waste disposal plant.
P270 : Do not eat, drink or smoke when using this product.
P264 : Wash skin thoroughly after handling.
P280 : Wear protective gloves/ eye protection/ face protection.
P337 + P313 : If eye irritation persists: Get medical advice/ attention.
P301 + P312 + P330 : IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. Rinse mouth.
Related Laws:
EC Number 218-760-9
RTECS# TN8991000
Transport Information:
HS Number 2933399990
Aerobic Oxidation of Alcohols Using 4-Hydroxy-TEMPO Adsorbed on Silica Gel

Typical Procedure:
Preparation of [4-hydroxy-TEMPO + NaCl]/SiO2
Silica gel (9.77 g) is added to the solution of 4-hydroxy-TEMPO (0.17 g) and NaCl (0.06 g) in water (50 mL), and the mixture is stirred at room temperature for half an hour. The water is removed by rotary evaporator under reduced pressure (65 °C and 40 mbar).

Aerobic Oxidation of Alcohols
A mixture of alcohols (2.0 mmol), Fe(NO3)3?9H2O (5?8 mol%) and [4-hydroxy-TEMPO + NaCl]/SiO2 [(0.1 + 0.1) mmol/g, 1.0 g] is stirred in DCE (5 mL) under air (1 atm) at room temperature, and then the used supported reagents are removed by filtration. Product yield is determined by GLC analysis using n-dodecane as an internal standard.


PubMed Literature


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