3(2H)-Pyridazinone supplier

Name
3(2H)-Pyridazinone
EINECS
CAS No. 504-30-3
Article Data26
CAS DataBase
Density 1.28 g/cm³
Solubility
Melting Point 98-104 °C
Formula C₄H₄N₂O
Boiling Point 315.9 °C at 760 mmHg
Molecular Weight 96.0886
Flash Point 144.9 °C
Transport Information
Appearance
Safety 26-36/37
Risk Codes 36/37/38
Molecular Structure
Hazard Symbols Xi
Synonyms 2H-Pyridazin-3-one;3-Hydroxypyridazine;3-Pyridazinol;3-Pyridazinone;6-Pyridazinone;NSC 21411;
PSA 45.75000
LogP -0.23010

Synthetic route

: 178047-61-5
3-Phenyl-7aH-1-oxa-2,3a,4-triaza-indene

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With air In benzene Ambient temperature; Irradiation;	90%

: 57697-64-0
mucochloric acid

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
Stage #1: mucochloric acid With tert-butylhydrazine In water; toluene at 23℃; for 2.8h; Stage #2: With tetrabutylammomium bromide; titanium(IV) oxide In water; toluene at 20℃; for 4.6h; Temperature;	88.9%

: 1173165-19-9
N'-acryloyl-N-allyl-4-methylbenzenesulfonohydrazide

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With Hoveyda-Grubbs catalyst second generation In dichloromethane at 40℃; for 36h; Sealed tube; Inert atmosphere;	87%

: 83297-14-7
5-(1,2-diaza-1-t-butylbutadien-4-ylidene)-2,2-dimethyl-1,3-dioxan-4,6-dione

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
at 750℃; under 0.01 - 0.1 Torr; for 1.5h;	63%

: 19064-67-6
6-chloro-2H-pyridazin-3-one

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With palladium on activated charcoal; hydrogen; potassium carbonate In ethyl acetate under 1551.49 Torr; for 3h;	55%

: 110-89-4
piperidine

: 60-29-7
diethyl ether

: 106-89-8
epichlorohydrin

: 56872-17-4
6-(3-allyl-4-hydroxy-phenyl)-4,5-dihydro-2H-pyridazin-3-one

A: 504-30-3
2H-Pyridazin-3-one

B: 56872-18-5
6-(3-allyl-4-oxiranylmethoxy-phenyl)-4,5-dihydro-2H-pyridazin-3-one

Conditions

Conditions	Yield
With sodium hydroxide In dichloromethane	A 47% B n/a

...Expand

: 289-80-5
1,2-diazine

: 873-67-6
benzonitrile oxide

A: 504-30-3
2H-Pyridazin-3-one

B: 6a,9a,9b-trihydro-3,9-diphenylisoxazolo<4,5-d><1,2,4>oxadiazolo<4,5-b>pyridazine

Conditions

Conditions	Yield
In benzene for 3h; Heating;	A 3% B 29%

...Expand

: 289-80-5
1,2-diazine

A: 504-30-3
2H-Pyridazin-3-one

B: 6a,9a,9b-trihydro-3,9-diphenylisoxazolo<4,5-d><1,2,4>oxadiazolo<4,5-b>pyridazine

Conditions

Conditions	Yield
With benzonitrile oxide In benzene for 3h; Heating;	A 3% B 29%

: 61468-81-3
3-oxo-2,3,4,5-tetrahydropyridazine

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With chloroform; bromine

: 932-22-9
4,5-dichloro-2H-pyridazin-3-one

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With sodium hydroxide; palladium on activated charcoal Hydrogenation;

: 5788-58-9
4,5-dibromo-3(2H)pyridazinone

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With sodium hydroxide; palladium on activated charcoal Hydrogenation;

: 867130-58-3
6-oxo-1,6-dihydro-pyridazine-4-carboxylic acid

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With copper

: 54404-06-7
3-oxo-2,3-dihydro-pyridazine-4-carboxylic acid

: 504-30-3
2H-Pyridazin-3-one

: 867130-51-6
6-oxo-1,6-dihydro-pyridazine-3,4-dicarboxylic acid

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With copper

: 62567-44-6
3-(ethyloxy)pyridazine

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
at 376.8℃; Rate constant; Thermodynamic data; further temperatures;

: 75-44-5
phosgene

: 145743-48-2
5-[3-(cyclopentyloxy)-4-methoxyphenyl]-1-methyl-3-pyrazolidinone

A: 504-30-3
2H-Pyridazin-3-one

B: 145743-63-1
3-[3-(cyclopentyloxy)-4-methoxyphenyl]-2-methyl-5-oxo-N-(3-pyridinylmethyl)-1-pyrazolidine carboxamide

Conditions

Conditions	Yield
With triethylamine In tetrahydrofuran; methanol; ethyl acetate; toluene

...Expand

: 106-95-6
allyl bromide

: 39499-64-4
6-(3-hydroxyphenyl)-4,5-dihydro-3(2H)-pyridazinone

A: 504-30-3
2H-Pyridazin-3-one

B: 56872-13-0
6-(3-allyloxy-phenyl)-4,5-dihydro-2H-pyridazin-3-one

Conditions

Conditions	Yield
With potassium carbonate In acetone

...Expand

: 106-94-5
propyl bromide

: 39560-33-3
6-(4-hydroxyphenyl)-4,5-dihydro-3(2H)-pyridazinone

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
In sodium hydroxide; ethanol

: C11H12N2O3S

: 504-30-3
2H-Pyridazin-3-one

Conditions

Conditions	Yield
With 1,8-diazabicyclo[5.4.0]undec-7-ene In tetrahydrofuran at 20℃;

: 504-30-3
2H-Pyridazin-3-one

: 4637-24-5
N,N-dimethyl-formamide dimethyl acetal

: 22687-56-5
2-methylpyridazin-3(2H)-one

Conditions

Conditions	Yield
In N,N-dimethyl-formamide Heating;	96%

: 504-30-3
2H-Pyridazin-3-one

: 2969-81-5
4-bromoethylbutanoate

: 346407-39-4
ethyl 4-[pyridazin-3(2H)-one-2-yl]-butyrate

Conditions

Conditions	Yield
With potassium carbonate In acetone for 24h; Heating;	95%

: 504-30-3
2H-Pyridazin-3-one

: 3058-39-7
4-iodobenzonitrile

: 4-(6-oxo-6H-pyridazin-1-yl)-benzonitrile

Conditions

Conditions	Yield
With copper(II) 7-n-propyl-8-hydroxyquinolinate; potassium carbonate In N,N-dimethyl-formamide at 100℃; for 20h;	94%

: 504-30-3
2H-Pyridazin-3-one

: 877-42-9
6-Bromo-2-methyl-quinoline

: 2-(2-methyl-quinolin-6-yl)-2H-pyridazin-3-one

Conditions

Conditions	Yield
With copper(II) 7-n-propyl-8-hydroxyquinolinate; potassium carbonate In N,N-dimethyl-formamide at 140℃; for 20h;	90%

: 504-30-3
2H-Pyridazin-3-one

: 107-13-1
acrylonitrile

: 73535-74-7
3-(3-oxo-2-pyridazinyl)propionitrile

Conditions

Conditions	Yield
With potassium hydroxide; tetrabutylammomium bromide In benzene for 5h; Ambient temperature;	89%
With N-benzyl-trimethylammonium hydroxide In ethanol for 8h; Heating;

: 504-30-3
2H-Pyridazin-3-one

: 591-50-4
iodobenzene

: 14135-63-8
2-phenyl-2H-pyridazin-3-one

Conditions

Conditions	Yield
With caesium carbonate; hydroxybenzaldoxime; copper(I) oxide In acetonitrile at 82℃; for 100h;	89%

: 504-30-3
2H-Pyridazin-3-one

: 1000305-04-3
1-{[(1S,2S)-2-(4-bromophenyl)cyclopropyl]methyl}-(2S)-2-methylpyrrolidine

: 2-[4-((1S,2S)-2-{[(2S)-2-methylpyrrolidin-1-yl]methyl}cyclopropyl)phenyl]pyridazin-3(2H)-one

Conditions

Conditions	Yield
With pyridine; potassium carbonate; copper(l) iodide; N,N`-dimethylethylenediamine In ethyl acetate at 115℃; Inert atmosphere;	86%
With pyridine; copper(l) iodide; N,N`-dimethylethylenediamine at 135℃; for 16h;
With pyridine; copper(l) iodide; N,N`-dimethylethylenediamine at 135℃; for 16h; Inert atmosphere; Sealed tube;

: 504-30-3
2H-Pyridazin-3-one

: 104-92-7
1-bromo-4-methoxy-benzene

: 2-(4-methoxy-phenyl)-2H-pyridazin-3-one

Conditions

Conditions	Yield
With copper(II) 7-n-propyl-8-hydroxyquinolinate; potassium carbonate In N,N-dimethyl-formamide at 140℃; for 20h;	85%

: 504-30-3
2H-Pyridazin-3-one

: 762-42-5
dimethyl acetylenedicarboxylate

: 1274944-76-1
dimethyl 2-(6-oxopyridazin-1(6H)-yl)fumarate

Conditions

Conditions	Yield
With triphenyl-arsane In acetone at -5℃; for 5.16667h; diastereospecific reaction;	85%
With pyridine In dichloromethane at 20℃; for 24h; stereoselective reaction;	80%
With triphenyl-arsane In methanol at 28℃; Catalytic behavior; Kinetics; Mechanism; Temperature; Reagent/catalyst; Concentration; diastereoselective reaction;

: 504-30-3
2H-Pyridazin-3-one

: 1416049-94-9
6-bromo-2-(3,3-dimethoxycyclobutyl)benzothiazole

: 1416049-95-0
2-(2-(3,3-dimethoxycyclobutyl)benzothiazol-6-yl)-pyridazin-3(2H)-one

Conditions

Conditions	Yield
With pyridine; potassium carbonate; copper(l) chloride; N,N`-dimethylethylenediamine at 100℃; for 16.5h; Solvent; Reagent/catalyst; Inert atmosphere;	84%

: 504-30-3
2H-Pyridazin-3-one

: 140-88-5
ethyl acrylate

: 73535-75-8
ethyl 3-[pyridazin-3(2H)-one-2-yl]-propionate

Conditions

Conditions	Yield
In ethanol	83%

: 84563-54-2
bis(4-tert-butylphenyl)iodonium trifluoromethanesulfonate

: 504-30-3
2H-Pyridazin-3-one

: 2-(4-(tert-butyl)phenyl)pyridazin-3(2H)-one

Conditions

Conditions	Yield
With triethylamine; copper(l) chloride In toluene at 20℃; for 1h; Inert atmosphere;	82%

: 504-30-3
2H-Pyridazin-3-one

: 948846-68-2
ethyl (3aR,6aR)-1-(4'-bromo-1,1'-biphenyl-4-yl)hexahydropyrrolo[3,4-b]pyrrole-5(1H)-carboxylate

: 948846-69-3
ethyl (3aR,6aR)-1-[4'-(6-oxopyridazin-1(6H)-yl)-1,1'-biphenyl-4-yl]hexahydropyrrolo[3,4-b]pyrrole-5(1H)-carboxylate

Conditions

Conditions	Yield
With potassium carbonate; copper(l) iodide; 8-quinolinol In N,N-dimethyl-formamide at 17 - 140℃; for 18h;	81.9%
With copper(l) iodide; 8-quinolinol; potassium carbonate In N,N-dimethyl-formamide at 17 - 140℃; for 18h; Product distribution / selectivity;	81.9%

: 504-30-3
2H-Pyridazin-3-one

: 69113-59-3
3-iodobenzonitrile

: 3-(6-oxo-6H-pyridazin-1-yl)-benzonitrile

Conditions

Conditions	Yield
With copper(II) 7-n-propyl-8-hydroxyquinolinate; potassium carbonate In N,N-dimethyl-formamide at 100℃; for 20h;	80%

: 504-30-3
2H-Pyridazin-3-one

: 22445-41-6
3,5-dimethylphenyl iodide

: 2-(3,5-dimethyl-phenyl)-2H-pyridazin-3-one

Conditions

Conditions	Yield
With copper(II) 7-n-propyl-8-hydroxyquinolinate; potassium carbonate In N,N-dimethyl-formamide at 100℃; for 20h;	80%

: 504-30-3
2H-Pyridazin-3-one

: 1372187-07-9
(6S,7R)-tert-butyl 7-(4-chloro-3-fluorophenyl)-6-((methylsulfonyloxy)methyl)-1,4-oxazepane-4-carboxylate

: (6S,7R)-tert-butyl 7-(4-chloro-3-fluorophenyl)-6-((6-oxopyridazin-1(6H)-yl)methyl)-1,4-oxazepane-4-carboxylate

Conditions

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide at 80℃; for 4h;	78%

: 504-30-3
2H-Pyridazin-3-one

: 825-56-9
2-phenyl-1,3,4-oxadiazole

: 1366397-77-4
3-(5-phenyl-1,3,4-oxadiazol-2-yl)pyridazine

Conditions

Conditions	Yield
Stage #1: 2H-Pyridazin-3-one With N-ethyl-N,N-diisopropylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In 1,4-dioxane at 100℃; for 0.5h; Inert atmosphere; Sealed vessel; Microwave irradiation; Stage #2: 2-phenyl-1,3,4-oxadiazole With copper(l) iodide; palladium diacetate; potassium carbonate; triphenylphosphine In 1,4-dioxane; 2,4-dichlorophenoxyacetic acid dimethylamine at 120℃; for 0.666667h; Inert atmosphere; Microwave irradiation; Sealed vessel;	75%

Yield

Stage #1: 2H-Pyridazin-3-one With N-ethyl-N,N-diisopropylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In 1,4-dioxane at 100℃; for 0.5h; Inert atmosphere; Sealed vessel; Microwave irradiation;
Stage #2: 2-phenyl-1,3,4-oxadiazole With copper(l) iodide; palladium diacetate; potassium carbonate; triphenylphosphine In 1,4-dioxane; 2,4-dichlorophenoxyacetic acid dimethylamine at 120℃; for 0.666667h; Inert atmosphere; Microwave irradiation; Sealed vessel;

75%

: 504-30-3
2H-Pyridazin-3-one

: trans-6-bromo-2-{3-[(2R)-2-methylpyrrolidin-1-yl]cyclobutyl}-1,3-benzothiazole

: trans-2-(2-{3-[(2R)-2-methylpyrrolidin-1-yl]cyclobutyl}-1,3-benzothiazol-6-yl)pyridazin-3(2H)-one

Conditions

Conditions	Yield
With pyridine; potassium carbonate; copper Heating / reflux;	74%

: 504-30-3
2H-Pyridazin-3-one

: 1120-95-2
3-chloropyridazine

Conditions

Conditions	Yield
With trichlorophosphate at 60℃; for 1.5h;	73%
With trichlorophosphate	63%
Stage #1: 2H-Pyridazin-3-one With trichlorophosphate at 85℃; for 4.5h; Stage #2: With sodium hydroxide In water at 0℃; pH=> 10;	46%

: 504-30-3
2H-Pyridazin-3-one

: 109-65-9
1-bromo-butane

: 79235-20-4
2-Butyl-2H-pyridazin-3-one

Conditions

Conditions	Yield
With potassium hydroxide; tetrabutylammomium bromide In benzene for 5h; Ambient temperature;	73%

: 504-30-3
2H-Pyridazin-3-one

: 10198-96-6
3,3'-bipyridazine

Conditions

Conditions	Yield
Stage #1: 2H-Pyridazin-3-one With triethylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In 1,4-dioxane at 100℃; for 0.5h; Inert atmosphere; Sealed vessel; Microwave irradiation; Stage #2: With copper(l) iodide; palladium diacetate; potassium carbonate; triphenylphosphine In 1,4-dioxane; 2,4-dichlorophenoxyacetic acid dimethylamine at 120℃; for 0.666667h; Inert atmosphere; Microwave irradiation; Sealed vessel;	71%

Yield

Stage #1: 2H-Pyridazin-3-one With triethylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In 1,4-dioxane at 100℃; for 0.5h; Inert atmosphere; Sealed vessel; Microwave irradiation;
Stage #2: With copper(l) iodide; palladium diacetate; potassium carbonate; triphenylphosphine In 1,4-dioxane; 2,4-dichlorophenoxyacetic acid dimethylamine at 120℃; for 0.666667h; Inert atmosphere; Microwave irradiation; Sealed vessel;

71%

: 504-30-3
2H-Pyridazin-3-one

: 273-53-0
benzoxazole

: 1366397-81-0
2-(pyridazin-3-yl)benzo[d]oxazole

Conditions

Conditions	Yield
Stage #1: 2H-Pyridazin-3-one With triethylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In 1,4-dioxane at 100℃; for 0.5h; Inert atmosphere; Sealed vessel; Microwave irradiation; Stage #2: benzoxazole With copper(l) iodide; palladium diacetate; potassium carbonate; triphenylphosphine In 1,4-dioxane; 2,4-dichlorophenoxyacetic acid dimethylamine at 120℃; for 0.666667h; Inert atmosphere; Microwave irradiation; Sealed vessel;	71%

Yield

Stage #1: 2H-Pyridazin-3-one With triethylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate In 1,4-dioxane at 100℃; for 0.5h; Inert atmosphere; Sealed vessel; Microwave irradiation;
Stage #2: benzoxazole With copper(l) iodide; palladium diacetate; potassium carbonate; triphenylphosphine In 1,4-dioxane; 2,4-dichlorophenoxyacetic acid dimethylamine at 120℃; for 0.666667h; Inert atmosphere; Microwave irradiation; Sealed vessel;

71%

: 75-21-8
oxirane

: 504-30-3
2H-Pyridazin-3-one

: 74316-72-6
2-(2-Hydroxyethyl)-3-pyridazone

Conditions

Conditions	Yield
With sodium methylate In methanol; N,N-dimethyl-formamide at 90℃; for 4h;	70%

: 504-30-3
2H-Pyridazin-3-one

: 6940-78-9
4-chlorobutyl bromide

: 2-(4-chlorobutyl)-pyridazin-3(2H)-one

Conditions

Conditions	Yield
With potassium carbonate In acetone Alkylation; Heating;	70%

: 504-30-3
2H-Pyridazin-3-one

: 539-74-2
Ethyl 3-bromopropionate

: 73535-75-8
ethyl 3-[pyridazin-3(2H)-one-2-yl]-propionate

Conditions

Conditions	Yield
With potassium carbonate In acetone for 24h; Heating;	70%

: 504-30-3
2H-Pyridazin-3-one

: 389806-32-0
2-bromo-6-iodo-naphthalene

: 2-(6-bromo-naphthalen-2-yl)-2H-pyridazin-3-one

Conditions

Conditions	Yield
With copper(II) 7-n-propyl-8-hydroxyquinolinate; potassium carbonate In N,N-dimethyl-formamide at 100℃; for 20h;	70%

3(2H)-Pyridazinone Chemical Properties

The molecular structure of 3(2H)-Pyridazinone (CAS NO.504-30-3):

IUPAC Name: 1H-Pyridazin-6-one
Molecular Weight: 96.08736 g/mol
Molecular Formula: C₄H₄N₂O
Density: 1.28 g/cm³
Melting Point: 98-104 °C
Boiling Point: 315.9 °C at 760 mmHg
Flash Point: 144.9 °C
Index of Refraction: 1.595
Molar Refractivity: 25.38 cm³
Molar Volume: 74.6 cm³
Surface Tension: 50.7 dyne/cm
Enthalpy of Vaporization: 57.94 kJ/mol
Vapour Pressure: 0.000228 mmHg at 25 °C
XLogP3-AA: -0.7
H-Bond Donor: 1
H-Bond Acceptor: 2
Tautomer Count: 2
Exact Mass: 96.032363
MonoIsotopic Mass: 96.032363
Topological Polar Surface Area: 41.5
Heavy Atom Count: 7
Canonical SMILES: C1=CC(=O)NN=C1
InChI: InChI=1S/C4H4N2O/c7-4-2-1-3-5-6-4/h1-3H,(H,6,7)
InChIKey: AAILEWXSEQLMNI-UHFFFAOYSA-N
Product Categories of 3(2H)-Pyridazinone (CAS NO.504-30-3): Building Blocks; Heterocyclic Building Blocks; Pyridazines; Pyridazine series

3(2H)-Pyridazinone Safety Profile

Hazard Codes: Irritant Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36/37
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36/37:Wear suitable protective clothing and gloves.
WGK Germany: 3

3(2H)-Pyridazinone Specification

3(2H)-Pyridazinone (CAS NO.504-30-3) is also named as 3-Hydroxypyridazine ; 3-Pyridazinol ; Pyridazin-3(2H)-one ; Pyridazin-3-ol ; 2H-Pyridazin-3-one ; 3 (2H)-Pyridazinone .

Product Name

3(2H)-Pyridazinone

Synthetic route

3(2H)-Pyridazinone Chemical Properties

3(2H)-Pyridazinone Safety Profile

3(2H)-Pyridazinone Specification

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