4-Hydroxy-TEMPO

4-Hydroxy-TEMPO
Names
	Preferred IUPAC name (4-Hydroxy-2,2,6,6-tetramethylpiperidin-1-yl)oxyl
	Other names tempol; tanol; TMPN; 4-Oxypiperidol; nitroxyl 2; HyTEMPO
Identifiers
CAS Number	2226-96-2 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:180664;
ChEMBL	ChEMBL607023 ;
ChemSpider	121639 ;
ECHA InfoCard	100.017.056
PubChem CID	137994;
UNII	U78ZX2F65X ;
CompTox Dashboard (EPA)	DTXSID4041280 ;
	InChI InChI=1S/C9H18NO2/c1-8(2)5-7(11)6-9(3,4)10(8)12/h7,11H,5-6H2,1-4H3 Key: UZFMOKQJFYMBGY-UHFFFAOYSA-N ; InChI=1S/C9H18NO2/c1-8(2)5-7(11)6-9(3,4)10(8)12/h7,11H,5-6H2,1-4H3 Key: UZFMOKQJFYMBGY-UHFFFAOYSA-N;
	SMILES CC1(C)CC(O)CC(C)(C)N1[O];
Properties
Chemical formula	C9H18NO2
Molar mass	172.248 g·mol−1
Appearance	Orange crystals
Melting point	71–73 °C (160–163 °F; 344–346 K)
Solubility in water	629.3 g/L (20 °C)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H315, H319, H335
Precautionary statements	P261, P305+P351+P338
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

4-Hydroxy-TEMPO or TEMPOL, formally 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl, is a heterocyclic compound. Like the related TEMPO, it is used as a catalyst and chemical oxidant by virtue of being a stable aminoxyl radical. Its major appeal over TEMPO is that it is less expensive, being produced from triacetone amine, which is itself made via the condensation of acetone and ammonia. This makes it economically viable on an industrial scale.

In biochemical research, 4-hydroxy-TEMPO has been investigated as an agent for limiting reactive oxygen species. It catalyzes the disproportionation of superoxide, facilitates hydrogen peroxide metabolism, and inhibits Fenton chemistry. 4-Hydroxy-TEMPO, along with related nitroxides, are being studied for their potential antioxidant properties.

On an industrial-scale 4-hydroxy-TEMPO is often present as a structural element in hindered amine light stabilizers, which are commonly used stabilizers in plastics, it is also used as a polymerisation inhibitor, particularly during the purification of styrene.

It is a promising model substance to inhibit SARS-CoV-2 RNA-dependent RNA polymerase.

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