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2226-96-2

Basic Information
CAS No.: 2226-96-2
Name: 4-Hydroxy-2,2,6,6-tetramethyl-piperidinooxy
Molecular Structure:
Molecular Structure of 2226-96-2 (4-Hydroxy-2,2,6,6-tetramethyl-piperidinooxy)
Formula: C9H18NO2
Molecular Weight: 172.28
Synonyms: 4-Hydroxy-2,2,6,6-tetramethylpiperidino-1-oxyl;Piperidinooxy,4-hydroxy-2,2,6,6-tetramethyl- (7CI,8CI);1-Oxyl-2,2,6,6-tetramethyl-4-piperidinol;2,2,6,6-Tetramethyl-4-hydroxy-1-piperidinyloxy radical;2,2,6,6-Tetramethyl-4-hydroxypiperidin-1-oxyl;2,2,6,6-Tetramethyl-4-hydroxypiperidine N-oxide;2,2,6,6-Tetramethyl-4-hydroxypiperidine-1-oxyl;2,2,6,6-Tetramethyl-4-hydroxypiperidinooxy;2,2,6,6-Tetramethyl-4-hydroxypiperidinyl-1-oxyl;2,2,6,6-Tetramethyl-4-hydroxypiperidinyloxyl radical;2,2,6,6-Tetramethyl-4-oxypiperidine-1-oxyl;2,2,6,6-Tetramethyl-4-piperidinol 1-oxyl;2,2,6,6-Tetramethylpiperidine-4-hydroxy-1-oxyl;4-Hydroxy-2,2,6,6-tetramethyl-1-piperidinoxy;4-Hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy;4-Hydroxy-2,2,6,6-tetramethylpiperidine-N-oxy;
EINECS: 218-760-9
Density: 1.187 g/cm3
Melting Point: 69-71 °C(lit.)
Boiling Point: 269ºC
Flash Point: 146°(295°F)
Solubility: soluble in water
Appearance: orange crystals
Hazard Symbols: HarmfulXn,IrritantXi
Risk Codes: 22-36/37/38-36/38
Safety: 26-36-37/39-36/37/39-27
Transport Information:
PSA: 23.47000
LogP: 1.28370
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Reported in EPA TSCA Inventory.

Specification

The IUPAC name of 4-Hydroxy-2,2,6,6-tetramethyl-piperidinooxy is 1-λ1-oxidanyl-2,2,6,6-tetramethylpiperidin-4-ol. With CAS registry number 2226-96-2, it is also named as 2,2,6,6-Tetramethyl-4-piperidinol-N-oxyl. The product's categories are analytical chemistry; ESR spectrometry; spin labels. It is orange crystals which is soluble in ethanol, benzene and other organic solvents, soluble in water. In addition, this chemical is stable and incompatible with strong oxidizing agents. Moreover, it should be sealed in the container and stored in the cool and dry place.  

The other characteristics of this product can be summarized as: (1)XLogP3-AA: 0.9; (2)H-Bond Donor: 1; (3)H-Bond Acceptor: 2; (4)Rotatable Bond Count: 0; (5)Exact Mass: 172.133754; (6)MonoIsotopic Mass: 172.133754; (7)Topological Polar Surface Area: 24.5; (8)Heavy Atom Count: 12; (9)Formal Charge: 0; (10)Complexity: 159; (11)Covalently-Bonded Unit Count: 1.

Preparation of 4-Hydroxy-2,2,6,6-tetramethyl-piperidinooxy: It can be obtained by 2,2,6,6-tetramethyl-piperidine-1,4-diol. This reaction needs reagent H2O2, Trilon B, catalytic agent K2WO4 and solvent H2O at temperature of 25 °C.

 

Uses of 4-Hydroxy-2,2,6,6-tetramethyl-piperidinooxy: It has good inhibition effect to acrylic acid esters, methyl acrylate, acrylic acid, acrylonitrile, styrene and butadiene. And it can react with benzene-1,2,4-tricarbonyl trichloride to get tris(2,2,6,6-tetramethyl-1-oxyl-4-piperidyloxy)trimellitate. This reaction needs reagent pyridine. The yield is 68%.

When you are using this chemical, please be cautious about it as the following:
It is not only harmful if swallowed, but also irritating to eyes, respiratory system and skin. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing, gloves and eye/face protection.

People can use the following data to convert to the molecule structure.
1. SMILES:CC1(CC(CC(N1[O])(C)C)O)C
2. InChI:InChI=1/C9H18NO2/c1-8(2)5-7(11)6-9(3,4)10(8)12/h7,11H,5-6H2,1-4H3 
3. InChIKey:UZFMOKQJFYMBGY-UHFFFAOYAG

The following are the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
rat LD50 oral 1053mg/kg (1053mg/kg) SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
National Technical Information Service. Vol. OTS0536225,