Pyridine-N-oxide supplier | CasNO.694-59-7

Name
Pyridine-N-oxide
EINECS 211-774-6
CAS No. 694-59-7
Article Data80
CAS DataBase
Density 1.03 g/cm³
Solubility Soluble in water
Melting Point 65-66 °C
Formula C₅H₅NO
Boiling Point 270 °C at 760 mmHg
Molecular Weight 95.1008
Flash Point 117.1 °C
Transport Information
Appearance White to light yellow solid
Safety 26-24/25-37/39-36/37/39-22
Risk Codes 36/37/38-22-40-20/21/22
Molecular Structure
Hazard Symbols Xn, Xi
Synonyms PYRIDINE-1-OXIDE;PYRIDINE-N-OXIDE;1-oxidePyridine;Pyridine oxide;pyridineoxide;Pyridin-N-oxid;Pyridine-N-Oxidee;PYRIDINE-1-OXIDE 97%
PSA 25.46000
LogP 1.11510

Synthetic route

: 110-86-1
pyridine

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
With 2,2,2-Trifluoroacetophenone; dihydrogen peroxide; acetonitrile In tert-butyl alcohol at 20℃; for 18h; pH=11; Catalytic behavior; Solvent; Reagent/catalyst; pH-value; Time; Green chemistry; chemoselective reaction;	99%
With dihydrogen peroxide In water at 59.84℃; for 1.5h; Reagent/catalyst; Autoclave;	99%
With dihydrogen peroxide In water at 20℃; for 4h; Catalytic behavior;	99%

: 98-98-6
2-Picolinic acid

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
With dihydrogen peroxide In water at 90℃; for 1h;	93%

: 110-86-1
pyridine

: Perfluoro-2-hexyl-3-pentyloxaziridine

A: 694-59-7
pyridine N-oxide

B: N-(Perfluorohexanoyl)pyridinium-1-aminide

Conditions

Conditions	Yield
In chloroform; trichlorofluoromethane	A 49% B 30%

...Expand

: 110-86-1
pyridine

A: 694-59-7
pyridine N-oxide

B: N-(Perfluorohexanoyl)pyridinium-1-aminide

Conditions

Conditions	Yield
With perfluoro(cis-2-hexyl-3-pentyloxaziridine) In chloroform; trichlorofluoromethane	A 49% B 30%

: 110-86-1
pyridine

: perfluoro-cis-2-n-butyl-3-n-propyloxaziridine

A: 694-59-7
pyridine N-oxide

B: N-(Perfluorobutanoyl)pyridinium-1-aminide

Conditions

Conditions	Yield
In chloroform; trichlorofluoromethane at -60℃; for 0.5h;	A 44% B 33%

...Expand

: 1121-76-2
4-chloropyridine N-oxide

A: 694-59-7
pyridine N-oxide

B: 553-26-4
4,4'-bipyridine

C: 24573-15-7
4,4'-bipyridine N,N'-dioxide

D: 39182-30-4
4,4'-bipyridine N-monoxide

Conditions

Conditions	Yield
With benzophenone; sodium In 1,4-dioxane for 12h; Product distribution; K, Li, dianione of potassium benzophenone;	A 35% B 13% C n/a D n/a

...Expand

: 100-46-9
benzylamine

A: 694-59-7
pyridine N-oxide

B: 780-25-6
N-benzylidene benzylamine

Conditions

Conditions	Yield
With pyridine; Oxone; tetrabutylammomium bromide In dichloromethane at 20℃; for 12h;	A n/a B 8%

: 110-86-1
pyridine

: 2311-91-3
monoperoxyphthalic acid

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
With diethyl ether

: 110-86-1
pyridine

: 93-59-4
Perbenzoic acid

: 71-43-2
benzene

: 694-59-7
pyridine N-oxide

...Expand

: 1121-76-2
4-chloropyridine N-oxide

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
With palladium on activated charcoal; ethanol Hydrogenation;

: 824-40-8
2-pyridinecarboxylic acid N-oxide

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
at 200℃;

: 53920-49-3
N-methoxypyridinium p-toluenesulfonate

: 62-53-3
aniline

A: 694-59-7
pyridine N-oxide

B: 100-61-8
N-methylaniline

Conditions

Conditions	Yield
at 120℃;

...Expand

: 110-86-1
pyridine

: 359-48-8
trifluoroacetyl peroxide

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
	100 % Chromat.

: 110-86-1
pyridine

: 53329-34-3
benzaldehyde hydrotrioxide

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
at 0℃; Product distribution; Rate constant; decomposition, temperature and various tertiary amines dependence;

: 110-86-1
pyridine

: 79516-27-1
isopropyl alcohol hydrotrioxide

: 694-59-7
pyridine N-oxide

Conditions

Conditions	Yield
In isopropyl alcohol at -1℃; Product distribution; Rate constant; decomposition, temperature and various tertiary amines dependence;

: 110-86-1
pyridine

: 94-36-0
dibenzoyl peroxide

A: 694-59-7
pyridine N-oxide

B: 93-97-0
benzoic acid anhydride

Conditions

Conditions	Yield
With N-tert-butyl-α-phenylnitrone In benzene at 80℃; Rate constant; Mechanism; other solvents, other reagents;

...Expand

: C6H5ClNO2(1+)*Cl(1-)

A: 694-59-7
pyridine N-oxide

B: 75-44-5
phosgene

Conditions

Conditions	Yield
In dichloromethane at 25℃; Equilibrium constant;

: 32709-07-2, 58256-65-8
hydride-bis-pyridine N-oxide perchlorate

A: 694-59-7
pyridine N-oxide

B: 58256-65-8
pyridine N-oxide perchlorate

Conditions

Conditions	Yield
In water; acetonitrile at 25℃; Equilibrium constant;

: 113369-12-3
carbonyldioxydipyridinium dichloride

A: 694-59-7
pyridine N-oxide

B: C6H5ClNO2(1+)*Cl(1-)

Conditions

Conditions	Yield
In dichloromethane at 25℃; Equilibrium constant;

: N-acetyloxypyridinium chloride

A: 694-59-7
pyridine N-oxide

B: 75-36-5
acetyl chloride

Conditions

Conditions	Yield
In dichloromethane at 24.9℃; Equilibrium constant; various solvents;

: 110-86-1
pyridine

: 336-64-1
bis(heptafluorobutyryl) peroxide

A: 694-59-7
pyridine N-oxide

B: 95682-68-1
pyridinium heptafluorobutyrate

Conditions

Conditions	Yield
In 1,1,2-Trichloro-1,2,2-trifluoroethane at -20℃; for 72h;	A n/a B 4.61 g

...Expand

: Pyridine 1-oxide; compound with 2,2,2-trifluoro-ethanethiol

A: 694-59-7
pyridine N-oxide

B: 1544-53-2
2,2,2-trifluoroethanethiol

Conditions

Conditions	Yield
In cyclohexane at 23.3℃; Equilibrium constant;

: 26708-23-6
trans-[4-(4'-dimethylaminostyryl)]pyridine N-oxide

: (1-dimethylcarbamoyloxy)pyridinium tetraphenylborate

A: 694-59-7
pyridine N-oxide

B: 4-(4-dimethylaminostyryl)-1-(dimethylcarbamoyl)pyridinium tetraphenylborate

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Rate constant; Kinetics;

...Expand

: 26708-23-6
trans-[4-(4'-dimethylaminostyryl)]pyridine N-oxide

: 1-acetyloxypyridinium tetraphenylborate

A: 694-59-7
pyridine N-oxide

B: 1-acetyloxy-4-(4'-N,N-dimethylaminostyryl)pyridinium tetraphenylborate

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Rate constant; Kinetics;

...Expand

: 26708-23-6
trans-[4-(4'-dimethylaminostyryl)]pyridine N-oxide

: 1-(morpholinocarbonyloxy)pyridinium tetrafluoroborate

A: 694-59-7
pyridine N-oxide

B: 705971-93-3
C24H20B(1-)*C20H24N3O3(1+)

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Rate constant; Kinetics;

...Expand

: 1122-58-3
dmap

: (1-dimethylcarbamoyloxy)pyridinium tetraphenylborate

A: 694-59-7
pyridine N-oxide

B: 1-N,N-dimethylcarbamoyl-4-dimethylaminopyridinium tetraphenylborate

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Thermodynamic data; -ΔH;

...Expand

: 1005-31-8
4-(dimethylamino)pyridine N-oxide

: 132653-98-6
1-dimethylaminocarbonyloxypyridinium bromide

A: 694-59-7
pyridine N-oxide

B: 118622-51-8
4-Dimethylamino-1-dimethylcarbamoyloxy-pyridinium; bromide

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Thermodynamic data; -ΔH; different solvent;

...Expand

: 1005-31-8
4-(dimethylamino)pyridine N-oxide

: (1-dimethylcarbamoyloxy)pyridinium tetraphenylborate

A: 694-59-7
pyridine N-oxide

B: 118972-30-8
1-N,N-dimethylcarbamoyloxy-4-dimethylaminopyridinium tetraphenylborate

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Thermodynamic data; -ΔH;

...Expand

: 1005-31-8
4-(dimethylamino)pyridine N-oxide

: 1-acetyloxypyridinium tetraphenylborate

A: 694-59-7
pyridine N-oxide

B: 1-acetoxy-4-(dimethylamino)pyridinium tetraphenylborate

Conditions

Conditions	Yield
In acetonitrile at 24.9℃; Thermodynamic data; -ΔH;
In acetonitrile at 24.85℃; Kinetics; Equilibrium constant; Thermodynamic data;

...Expand

: 694-59-7
pyridine N-oxide

: 110-86-1
pyridine

Conditions

Conditions	Yield
With triphenylphosphine; molybdenum In benzene at 40℃; for 12h;	100%
With carbon monoxide; 1 wt% Au/TiO2; water In acetone at 60℃; under 7600.51 Torr; for 10h; Autoclave;	99%
With sodium tetrahydroborate; zirconium(IV) chloride In tetrahydrofuran at 0 - 35℃; for 0.25h; Product distribution; Further Variations:; Reaction partners; reaction time; Reduction;	98%

: 694-59-7
pyridine N-oxide

: 100-59-4
phenylmagnesium chloride

: C11H12(2)HNO

Conditions

Conditions	Yield
Stage #1: pyridine N-oxide; phenylmagnesium chloride Inert atmosphere; Stage #2: With sodium tetrahydroborate; deuteromethanol at -40℃; Inert atmosphere; regioselective reaction;	100%

: 694-59-7
pyridine N-oxide

: 910650-82-7
1-fluoro-1,1-bis(phenylsulfonyl)methane

: 1572417-64-1
2-(fluorobis(phenylsulfonyl)methyl)pyridine

Conditions

Conditions	Yield
With N-ethyl-N,N-diisopropylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In dichloromethane at 20℃; regioselective reaction;	100%

: 694-59-7
pyridine N-oxide

: [Co(H2O)6][bis(trifluoromethylsulfonyl)imide]2

: [Co(pyridine-N-oxide)6][bis(trifluoromethylsulfonyl)imide]2

Conditions

Conditions	Yield
In ethanol for 0.0833333h;	100%

: 694-59-7
pyridine N-oxide

: 17740-11-3
2λ4-[2,2']Spirobi(benzo[1,3,2]dioxatellurol)

: C17H13NO5Te

Conditions

Conditions	Yield
In tetrahydrofuran at 20℃; for 1h; Inert atmosphere;	100%

: 694-59-7
pyridine N-oxide

: 274-87-3
tetrazolo[1,5-a]pyridine

Conditions

Conditions	Yield
With sodium azide; p-toluenesulfonyl chloride In toluene at 120℃; for 48h;	99%
With pyridine; diphenyl phosphoryl azide at 120℃; for 24h; Inert atmosphere;	95%
With pyridine; diphenyl phosphoryl azide at 120℃; for 24h;	90%
With phenylsulfonyl azide for 1h; Heating;	40%

: 694-59-7
pyridine N-oxide

: 27062-39-1
tricyanoethenol

: N-Hydroxypyridinium 1,2,2-tricyanoethenolate

Conditions

Conditions	Yield
In water	99%

: 694-59-7
pyridine N-oxide

: HB(C3H3N2)3ReOC2H5(CF3SO3)

: 127540-97-0
hydridotris(pyrazolyl)borato trioxo rhenium(VII)

Conditions

Conditions	Yield
In chloroform-d1 byproducts: acetaldehyde, pyridine, pyridinium triflate; (inert atmosphere), 3 equiv. of pyO;	99%
In benzene-d6 byproducts: acetaldehyde, pyridine, pyridinium triflate; (inert atmosphere), 3 equiv. of pyO;	99%
In dichloromethane-d2 byproducts: acetaldehyde, pyridine, pyridinium triflate; (inert atmosphere), 3 equiv. of pyO;	97%

: 694-59-7
pyridine N-oxide

: U(4+)*2C5(CH3)5(1-)*5CN(1-)*3N(C2H5)4(1+)=[U(C5(CH3)5)2(CN)5](N(C2H5)4)3

: [UO2(C5(CH3)5)(CN)3](2-)*2N(C2H5)4(1+)=[UO2(C5(CH3)5)(CN)3](N(C2H5)4)2

Conditions

Conditions	Yield
In tetrahydrofuran byproducts: N(C2H5)4CN; heated at 110°C for 3 h; separated manually;	99%
In [D3]acetonitrile byproducts: N(C2H5)4CN; heated at 110°C for 1 h; NMR;

: 694-59-7
pyridine N-oxide

: 1258790-68-9
[C2H5NC4H4B(O3SCF3)]

: 1260582-49-7
[C2H5NC4H4BONC5H5](1+)*O3SCF3(1-)=[C2H5NC4H4BONC5H5]O3SCF3

Conditions

Conditions	Yield
In dichloromethane azaborine was reacted with ONC5H5 in CH2Cl2 at room temp.;	99%
In dichloromethane at 20℃;	99%

: 694-59-7
pyridine N-oxide

: 7732-18-5
water

: silver nitrate

: [silver(I)(pyridine-N-oxide)2(nitrate)]

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	99%

...Expand

: 694-59-7
pyridine N-oxide

: 1334406-90-4, 1357467-59-4
[silver(I)(acetonitrile)](bis(trifluoromethanesulfonyl)imide)

: [silver(I)(pyridine-N-oxide)3](bis(trifluoromethanesulfonyl)imide)

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	99%

: 694-59-7
pyridine N-oxide

: 2923-28-6
silver trifluoromethanesulfonate

: [silver(I)(pyridine-N-oxide)3](trifluoromethanesulfonate)

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	99%

: 694-59-7
pyridine N-oxide

: 2386-52-9
silver methanesulfonate

: [silver(I)(pyridine-N-oxide)2](methanesulfonate)

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	99%

: 694-59-7
pyridine N-oxide

: 2386-52-9
silver methanesulfonate

: [silver(I)(pyridine-N-oxide)3](methanesulfonate) monohydrate

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	99%

: 694-59-7
pyridine N-oxide

: 77-78-1
dimethyl sulfate

: 51342-19-9
N-methoxypyridinium methyl sulfate

Conditions

Conditions	Yield
at 0 - 100℃; for 5h; Inert atmosphere;	99%
In neat (no solvent) at 0 - 100℃; for 5h; Inert atmosphere;	99%
at 0 - 100℃; for 5h; Inert atmosphere;	99%

: 694-59-7
pyridine N-oxide

: potassium (4-methylphenyl)trifluoroborate

: 33421-24-8
2-(4-methylphenyl)pyridine N-oxide

Conditions

Conditions	Yield
With palladium diacetate; tetra-(n-butyl)ammonium iodide; silver(l) oxide In 1,4-dioxane at 80℃; for 12h; regioselective reaction;	98%

: 694-59-7
pyridine N-oxide

: manganese(II) bistriflimide hexahydrate

: [manganese(II)(pyridine-N-oxide)6] bistriflimide

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	98%

: 109-99-9
tetrahydrofuran

: 694-59-7
pyridine N-oxide

: 2-(tetrahydrofuran-2-yl)pyridine 1-oxide

Conditions

Conditions	Yield
With triisopropanolamine; iron(III)-acetylacetonate; Cumene hydroperoxide; sodium tosylate; 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide at 80℃; for 10h; Reagent/catalyst; Inert atmosphere;	97.2%
With tert.-butylhydroperoxide; potassium carbonate at 140 - 145℃; for 16h; Reagent/catalyst; Glovebox; Inert atmosphere; Schlenk technique;	68%

: 694-59-7
pyridine N-oxide

: 79-44-7
N,N-Dimethylcarbamoyl chloride

: (1-dimethylcarbamoyloxy)pyridinium tetraphenylborate

Conditions

Conditions	Yield
With sodium tetraphenyl borate In acetonitrile	97%

: 694-59-7
pyridine N-oxide

: 2398-37-0
3-methoxyphenyl bromide

: 2-(3-methoxyphenyl)pyridine N-oxide

Conditions

Conditions	Yield
With palladium diacetate; potassium carbonate; tri tert-butylphosphoniumtetrafluoroborate In toluene at 110℃;	97%
With potassium carbonate; palladium diacetate; tri tert-butylphosphoniumtetrafluoroborate In toluene at 110℃; Product distribution / selectivity;	75%

: 694-59-7
pyridine N-oxide

: Re(CO)4(CH3OCOC(CH)CSS)Re(CO)4

: Re(CO)4(CH3OCOC(CHO)CSS)Re(CO)4

Conditions

Conditions	Yield
In dichloromethane react. at 25°C for 20 min; chromy. on silica gel; elem. anal.;	97%

: 694-59-7
pyridine N-oxide

: silver nitrate

: [silver(I)(pyridine-N-oxide)2(nitrate)]

Conditions

Conditions	Yield
In acetonitrile at 20℃; for 1h;	97%

: 694-59-7
pyridine N-oxide

: 145592-98-9
C12Cl8O4Te

: C17H5Cl8NO5Te

Conditions

Conditions	Yield
In tetrahydrofuran at 20℃; for 1h; Inert atmosphere;	97%

: 694-59-7
pyridine N-oxide

: 72954-72-4
C28H40O4Te

: C33H45NO5Te

Conditions

Conditions	Yield
In toluene at 20℃; for 1.5h; Inert atmosphere;	97%

: 694-59-7
pyridine N-oxide

: 358-23-6
trifluoromethylsulfonic anhydride

: 93743-67-0
N-(trifluoromethylsulfonyloxy)pyridinium trifluoromethanesulfonate

Conditions

Conditions	Yield
at -25 - 20℃; Inert atmosphere; Sealed tube; Glovebox;	96.7%
In dichloromethane at -20℃;	93%
In dichloromethane for 0.333333h; Ambient temperature;

: 694-59-7
pyridine N-oxide

: 79-22-1
methyl chloroformate

: 1-Methoxycarbonyloxy-pyridinium; perchlorate

Conditions

Conditions	Yield
With sodium perchlorate In acetonitrile	96%

: 694-59-7
pyridine N-oxide

: 1885-14-9
phenyl chloroformate

: 1-Phenoxycarbonyloxy-pyridinium; perchlorate

Conditions

Conditions	Yield
With sodium perchlorate In acetonitrile	96%

: 694-59-7
pyridine N-oxide

: 97879-05-5
{3(E)-benzylidene-1-methyl-4-phenylazetidinylidene}-pentacarbonylchromium(0)

: 97879-03-3
(E)-3-benzylidene-1-methyl-4-phenyl-2-azetidinone

Conditions

Conditions	Yield
In dichloromethane A soln. of chromium compound is added to pyridine N-oxide and stirred for 7 days at room temp.; evapn. of solvent, chromy.;	96%

Pyridine-N-oxide Chemical Properties

The Molecular formula of PYRIDINE-1-OXIDE(694-59-7): C₅H₅NO
The Molecular Weight of PYRIDINE-1-OXIDE(694-59-7): 95.1
Molecular Structure:

EINECS: 211-774-6
Melting point: 62-67 °C(lit.)
Boiling Point: 270 °C at 760 mmHg
Flash Point: 117.1 °C
Index of Refraction: 1.516
Molar Refractivity: 27.84 cm³
Molar Volume: 92 cm³
Polarizability: 11.03 10 ^-24 cm³
Surface Tension: 40.5 dyne/cm
Density: 1.03 g/cm3
Enthalpy of Vaporization: 48.77 kJ/mol
Vapour Pressure: 0.0116 mmHg at 25°C
storage temp.: 2-8^°C
Water Solubility: soluble
Sensitive: Hygroscopic
Appearance: White to light yellow solid
Merck: 14,7972
BRN: 105257
IUPAC Name: 1-oxidopyridin-1-ium
Synonyms: PYRIDINE-1-OXIDE;PYRIDINE-N-OXIDE;Pyridin-N-oxid;Pyridine-N-Oxidee;PYRIDINE-1-OXIDE 97%;1-oxidePyridine;Pyridine oxide;pyridineoxide;

Pyridine-N-oxide Toxicity Data With Reference

1.	ipr-mus LD50:1425 mg/kg	JPPMAB Journal of Pharmacy and Pharmacology. 16 (1964),472.
2.	ivn-mus LD50:180 mg/kg	CSLNX* U.S. Army Armament Research & Development Command, Chemical Systems Laboratory, NIOSH Exchange Chemicals. (Aberdeen Proving Ground, MD 21010) NX#04070 .
3.	orl-qal LD50:1000 mg/kg	JRPFA4 Journal of Reproduction and Fertility. 48 (1976),371.
4.	orl-bwd LD50:1 g/kg	AECTCV Archives of Environmental Contamination and Toxicology. 12 (1983),355.

Pyridine-N-oxide Consensus Reports

Reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

Pyridine-N-oxide Safety Profile

Poison by intravenous route. Moderately toxic by ingestion and intraperitoneal routes. Flammable. Potentially explosive reaction with hexamethyldisilane + tetrabutylammonium fluoride. Incompatible with oxidizing materials. When heated to decomposition it emits toxic fumes of NO_x.
Hazard Codes of PYRIDINE-1-OXIDE(694-59-7): Xi,Xn
Risk Statements of PYRIDINE-1-OXIDE(694-59-7):
22: Harmful if swallowed
40: Limited evidence of a carcinogenic effect
20/21/22: Harmful by inhalation, in contact with skin and if swallowed
36/37/38: Irritating to eyes, respiratory system and skin
Safety Statements of PYRIDINE-1-OXIDE(694-59-7):
22: Do not breathe dust
26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 24/25: Avoid contact with skin and eyes
24/25: Avoid contact with skin and eyes
36/37/39: Wear suitable protective clothing, gloves and eye/face protection
37/39: Wear suitable gloves and eye/face protection
WGK Germany: 3
RTECS: UT6410000
F: 21
HS Code: 29333999

Product Name

Pyridine-N-oxide

Synthetic route

Pyridine-N-oxide Chemical Properties

Pyridine-N-oxide Toxicity Data With Reference

Pyridine-N-oxide Consensus Reports

Pyridine-N-oxide Safety Profile

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