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2154-68-9 - 3-Carboxy-PROXYL, free radical, 97+% - 3-Carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxy, free radical - L15068 - Alfa Aesar

L15068 3-Carboxy-PROXYL, free radical, 97+%

CAS Number
3-Carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxy, free radical

Size Price ($) Quantity Availability
50mg 36.05
250mg 105.06
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3-Carboxy-PROXYL, free radical, 97+%


Chemical Properties

Formula Weight
Melting point
ca 200° dec.
Soluble in water (partly miscible), methanol (50 mg/ml), acetone, dichloromethane and chloroform.


3-Carboxy-PROXYL is used in the synthesis and reactions of stable nitroxyl radicals. It is also used to study molecular migration and long-term stability of seeds and pollen and used in the preparation of a tetraphenylporphyrin bearing a nitroxyl radical.


Store in cool place. Keep container tightly closed in a dry and well-ventilated place. Recommended storage temperature is 2 - 8°C.

Literature References

Prof. E. W. Meijer.; Dr. Johan F. G. A. Jansen.; Dr. René A. J. Janssen.; Dr. Ellen M. M. de Brabandero-van den Berg.; Prof. E. W. Meijer. Triplet radical pairs of 3-carboxyproxyl encapsulated in a dendritic box. Advanced Materials. 1995, 7 (6), 561-564.

S. Dikalov.; M. Skatchkov.; E. Bassenge. Spin Trapping of Superoxide Radicals and Peroxynitrite by 1-Hydroxy-3-carboxy-pyrrolidine and 1-Hydroxy-2,2,6,6-tetramethyl-4-oxo-piperidine and the Stability of Corresponding Nitroxyl Radicals Towards Biological Reductants. Biochemical and Biophysical Research Communications. 1997, 231 (3), 701-704.

Reviews: Synthesis and reactions of stable nitroxyl radicals: Synthesis, 190, 401 (1971); Advances in the chemistry of nitroxide spin labels: Chem. Rev., 78, 37 (1978); Recent advances in the chemistry of nitroxides and their applications in spin labelling: J. Sci. Ind. Res., 54, 623 (1995).

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P280-P305+P351+P338-P304+P340-P362-P312-P321-P405-P403+P233-P501a

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Take off contaminated clothing and wash before reuse. Call a POISON CENTER or doctor/physician if you feel unwell. Specific treatment (see label). Store locked up. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


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  • L08163

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