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4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE structure

CAS No.: 64178-58-1

Chemical Name:: 4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE

Synonyms: 5-chloro-4-hydroxy-1H-pyridazin-6-one;4-Chloro-5-hydroxypyridazin-3(2H)-one;5-Chloro-6-hydroxy-1H-pyridazin-4-one;4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE;3(2H)-Pyridazinone, 4-chloro-5-hydroxy-;4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE ISO 9001：2015 REACH

CBNumber:: CB12463835

Molecular Formula:: C4H3ClN2O2

Molecular Weight:: 146.53

MDL Number:: MFCD00832513

MOL File:: 64178-58-1.mol

MSDS File:: SDS

Last updated:2026-01-12 17:28:22

Product description	Number	Pack Size	Price
4-Chloro-5-hydroxypyridazin-3(2H)-one 95%	AS48086	1g	$73
4-Chloro-5-hydroxypyridazin-3(2H)-one 95%	AS48086	5g	$219
4-Chloro-5-hydroxypyridazin-3(2H)-one 95+%	C40032	250mg	$100
4-Chloro-5-hydroxypyridazin-3(2H)-one 95+%	C40032	1g	$120
4-Chloro-5-hydroxypyridazin-3(2H)-one 95+%	C40032	5g	$330

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4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE Properties

Melting point	270-273 °C(Solv: N,N-dimethylformamide (68-12-2))
Density	1.79±0.1 g/cm3(Predicted)
storage temp.	under inert gas (nitrogen or Argon) at 2-8°C
pka	4.50±1.00(Predicted)
Appearance	White to off-white Solid

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE price More Price(21)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Activate Scientific	AS48086	4-Chloro-5-hydroxypyridazin-3(2H)-one 95%	64178-58-1	1g	$73	2026-06-04	Buy
Activate Scientific	AS48086	4-Chloro-5-hydroxypyridazin-3(2H)-one 95%	64178-58-1	5g	$219	2026-06-04	Buy
Synthonix	C40032	4-Chloro-5-hydroxypyridazin-3(2H)-one 95+%	64178-58-1	250mg	$100	2026-05-06	Buy
Synthonix	C40032	4-Chloro-5-hydroxypyridazin-3(2H)-one 95+%	64178-58-1	1g	$120	2026-05-06	Buy
Synthonix	C40032	4-Chloro-5-hydroxypyridazin-3(2H)-one 95+%	64178-58-1	5g	$330	2026-05-06	Buy

Product number	Packaging	Price	Buy
AS48086	1g	$73	Buy
AS48086	5g	$219	Buy
C40032	250mg	$100	Buy
C40032	1g	$120	Buy
C40032	5g	$330	Buy

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE Chemical Properties,Uses,Production

Uses

4-Chloro-5-hydroxy-3(2H)-pyridazine is an organic intermediate.

Synthesis

Wagner et al. reported that it can be prepared from 4,5-dichloropyridazin-3(2H)-one as starting material. 4,5-Dichloropyridazin-3(2H)-one (2 g, 12 mmol) was refluxed in 20 ml of 8N KOH for 6 hours. After acidification with HCl, the reaction mixture was concentrated in vacuum and extracted with ethyl acetate to give 4-chloro-5-hydroxy3(2H)-pyridazine. Yield 0.69 g, 54%. m.p. 267-272°C (from DMF), Lit. 270-273°C. IR: 2300-3340re,b,1650m,1595s,1555shcm-1.1H-NMR(DMSO-d6):δ=7.7 (s HatC-6),12.9(s,b,NH).C4H3C1N2O2(146.5);calcd.C32.78,H2.06,N19.12;foundC32.75,H2.17,N19.06.

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE synthesis

Synthesis of 4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE from 4-CHLORO-5-METHOXYPYRIDAZIN-3(2H)-ONE

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE Preparation Products And Raw materials

Raw materials

Preparation Products

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE Suppliers

Global( 36)Suppliers

Supplier	Tel	Email	Country	ProdList	Advantage
Dideu Industries Group Limited	+86-29-89586680 +86-15129568250	1059@dideu.com	China	29096	58
Hefei Hirisun Pharmatech Co., Ltd	+8615056975894	shawn@hirisunpharm.com	CHINA	9897	58
Dayang Chem (Hangzhou) Co.,Ltd.	+86-0571-88938639 17705817739	info@dycnchem.com	China	52693	58
Alfa Chemistry	+1-5166625404;	Info@alfa-chemistry.com	United States	20000	58
GIHI CHEMICALS CO.,LIMITED	+86-571-86217390; +8618058761490	info@gihichemicals.com	China	49859	58
HANGZHOU LEAP CHEM CO., LTD.	+86-571-87711850 +86-15355479329	market18@leapchem.com	China	43303	58
Sichuan Biosynce Pharmatech Co., Ltd.		diane@biosynce.com	China	4863	58
Amadis Chemical Company Limited	571-89925085	sales@amadischem.com	China	131885	58
Nanbu County Chengxin Technology Co., Ltd.	0838-5675166 15883665058	nbcxkj@126.com	China	956	55
Shanghai Hanhong Scientific Co.,Ltd.	021-54306202 13764082696	info@hanhongsci.com	China	42917	64

Supplier	Advantage
Dideu Industries Group Limited	58
Hefei Hirisun Pharmatech Co., Ltd	58
Dayang Chem (Hangzhou) Co.,Ltd.	58
Alfa Chemistry	58
GIHI CHEMICALS CO.,LIMITED	58
HANGZHOU LEAP CHEM CO., LTD.	58
Sichuan Biosynce Pharmatech Co., Ltd.	58
Amadis Chemical Company Limited	58
Nanbu County Chengxin Technology Co., Ltd.	55
Shanghai Hanhong Scientific Co.,Ltd.	64

View Lastest Price from 4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE manufacturers

Image	Update time	Product	Price	Min. Order	Purity	Supply Ability	Manufacturer
	2025-11-18	4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE 64178-58-1	$1.10	1g	99.00%	100 Tons Min	Dideu Industries Group Limited

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE
64178-58-1
$1.10
99.00%
Dideu Industries Group Limited

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE Spectrum

4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE(64178-58-1)¹HNMR

64178-58-1(4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE)Related Search:

4-CHLORO-5-METHOXYPYRIDAZIN-3(2H)-ONE 4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE 4-CHLORO-5-METHOXY-2-METHYL-2,3-DIHYDROPYRIDAZIN-3-ONE 4-CHLORO-2-(1,1-DIMETHYLETHYL)-5-HYDROXY-3(2H)-PYRIDAZINONE 4-Chloro-5-ethoxy-2-phenyl-3(2H)-pyridazinone

1-([5-CHLORO-1-(4-METHOXYPHENYL)-6-OXO-1,6-DIHYDRO-4-PYRIDAZINYL]OXY)DIHYDRO-1H-PYRROLE-2,5-DIONE AKOS B029249 4-CHLORO-5-ETHOXY-2-METHYL-3(2H)-PYRIDAZINONE 4-CHLORO-5-ETHOXY-2-(4-METHYLPHENYL)-3(2H)-PYRIDAZINONE 2-([5-CHLORO-1-(3-CHLOROPHENYL)-6-OXO-1,6-DIHYDRO-4-PYRIDAZINYL]OXY)-1H-ISOINDOLE-1,3(2H)-DIONE

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AKOS B029248 1-((5-CHLORO-1-[3-CHLORO-5-(TRIFLUOROMETHYL)-2-PYRIDINYL]-6-OXO-1,6-DIHYDRO-4-PYRIDAZINYL)OXY)DIHYDRO-1H-PYRROLE-2,5-DIONE AURORA KA-4786

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4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE 5-Chloro-6-hydroxy-1H-pyridazin-4-one 4-Chloro-5-hydroxypyridazin-3(2H)-one 5-chloro-4-hydroxy-1H-pyridazin-6-one 3(2H)-Pyridazinone, 4-chloro-5-hydroxy- 4-CHLORO-5-HYDROXY-3(2H)-PYRIDAZINONE ISO 9001：2015 REACH 64178-58-1