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Sigma-Aldrich

TEMPO

greener alternative

98%

Synonym(s):

2,2,6,6-Tetramethylpiperidine 1-oxyl, 2,2,6,6-Tetramethyl-1-piperidinyloxy, free radical, TEMPO

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About This Item

Empirical Formula (Hill Notation):
C9H18NO
CAS Number:
2564-83-2
Molecular Weight:
156.25
Beilstein:
1422418
EC Number:
219-888-8
MDL number:
MFCD00009599
UNSPSC Code:
12352119
PubChem Substance ID:
24852819
NACRES:
NA.22

Quality Level

200

Assay

98%

form

solid

reaction suitability

reagent type: oxidant

greener alternative product characteristics

Catalysis
Learn more about the Principles of Green Chemistry.

sustainability

Greener Alternative Product

mp

36-38 °C (lit.)

greener alternative category

Aligned,

storage temp.

2-8°C

SMILES string

CC1(C)CCCC(C)(C)N1[O]

InChI

1S/C9H18NO/c1-8(2)6-5-7-9(3,4)10(8)11/h5-7H2,1-4H3

InChI key

QYTDEUPAUMOIOP-UHFFFAOYSA-N

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General description

TEMPO (2,2,6,6-Tetramethylpiperidin-1-oxyl) is a stable free radical commonly used as an oxidizing agent in organic synthesis. Copper/TEMPO has been utilized in the catalytic oxidation of primary alcohols to aldehydes.
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Application

TEMPO can be used:
  • As a catalytic oxidant for copper-catalyzed, greener oxidation of alcohols under aerobic conditions.
  • As a catalytic oxidant in the iodobenzene diacetae oxidation of nerol to neral.
  • For trapping the styrenyl radical generated from benzoyl peroxide during nitroxide-mediated radical polymerization of styrene.
  • In the carboxylation of water-resistant nanofibrillated cellulose (NFC) films.

Copper(I)/TEMPO-catalyzed aerobic oxidation of primary alcohols to aldehydes with ambient air

Pictograms

Corrosion
GHS05

Signal Word

Danger

Hazard Statements

H314,H412

Hazard Classifications

Aquatic Chronic 3 - Eye Dam. 1 - Skin Corr. 1C

Storage Class Code

8A - Combustible corrosive hazardous materials

WGK

WGK 2

Flash Point(F)

152.6 °F - closed cup

Flash Point(C)

67 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Geisslmeir, David; et al.
Monatshefte fur Chemie / Chemical Monthly, 136(9), 1591-1599 (2005)
Wan Ru Leow et al.
Science (New York, N.Y.), 368(6496), 1228-1233 (2020-06-13)
Chemicals manufacturing consumes large amounts of energy and is responsible for a substantial portion of global carbon emissions. Electrochemical systems that produce the desired compounds by using renewable electricity offer a route to lower carbon emissions in the chemicals sector.
Block copolymer synthesis using a commercially available nitroxide-mediated radical polymerization (NMP) initiator.
Lee NS and Wooley KL.
Material Matters, 5, 8-15 (2010)
Solvent effect on (2, 2, 6, 6-Tetramethylpiperidine-1-yl) oxyl (TEMPO): a RISM-SCF-SEDD study.
Fernandez MJF and Sato H.
Theoretical Chemistry Accounts, 130(2-3), 299-304 (2011)
Hayaka Fukuzumi et al.
Carbohydrate polymers, 93(1), 172-177 (2013-03-08)
Various mechanical disintegration conditions in water were applied to 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose to prepare TEMPO-oxidized cellulose nanofibrils (TOCNs) of uniform widths ∼4 nm but with three different average lengths, 200, 680, and 1100 nm. The viscosity average degrees of polymerization
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Articles

TEMPO Catalyzed Oxidations

TEMPO (2,2,6,6-Tetramethylpiperidinyloxy or 2,2,6,6-Tetramethylpiperidine 1-oxyl) and its derivatives are stable nitroxy radicals used as catalysts in organic oxidation reactions. TEMPO was discovered by Lebedev and Kazarnovskii in 1960. The stable free radical nature of TEMPO is due to the presence of bulky substituent groups, which hinder the reaction of the free radical with other molecules.

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