4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl

4-羟基-2,2,6,6-四甲基哌啶-1-氧自由基

Also known as: Tempol, 4-Hydroxy-TEMPO, 4-Hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy, 4-Hydroxy-2,2,6,6-tetramethylpiperidine N-oxide, 2,2,6,6-Tetramethyl-4-hydroxypiperidine 1-oxyl, 4-Hydroxy-2,2,6,6-tetramethylpiperidinyloxy, HYDROXY-TEMPO, NR-I, TMPN, Tanol

CAS No.
2226-96-2
Jingsj CID
J-5362-6
Molecular Formula
C9H18NO2
Chinese Name
4-羟基-2,2,6,6-四甲基哌啶-1-氧自由基
Molecular Weight
172.24 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026

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Physicochemical Properties

Melting Point69-71 °C(lit.)
Boiling Point269ºC
Density1.187 g/cm3

GHS Safety & Compliance

IrritantSignal word: Warning

Frequently Asked Questions

What is the CAS number of 4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl?

2226-96-2

What are the molecular formula and molecular weight of 4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl?

C9H18NO2*, molecular weight 172.24 g/mol

Is 4-Hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl hazardous?

Warning

Data compiled from public chemical databases and supplier catalogs; verify specifications with suppliers before purchase. · Last updated: 8/21/2026