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4,5-Dichloro-2-methylpyridazin-3-one

4,5-Dichloro-2-methylpyridazin-3-one structure

CAS No.: 933-76-6

Chemical Name:: 4,5-Dichloro-2-methylpyridazin-3-one

Synonyms: AKOS B029262;Emorfazone int;2-Methyl-4,5-dichloro-3-pyridazinone;4,5-Dichloro-2-methylpyridazin-3-one;4,5-dichloro-2-methylpyridazine-3-one;5-Dichloro-2-Methyl-3(2H)-pyridazinone;5-Dichloro-2-methylpyridazin-3(2H)-one;4,5-dichloro-2-methyl-3(2h)-pyridazinon;4,5-DICHLORO-2-METHYL-3(2H)-PYRIDAZINONE;4,5-DICHLORO-2-METHYL-2H-PYRIDAZIN-3-ONE

CBNumber:: CB8728203

Molecular Formula:: C5H4Cl2N2O

Molecular Weight:: 179

MDL Number:: MFCD00051686

MOL File:: 933-76-6.mol

MSDS File:: SDS

TDS File:: TDS

Last updated:2026-09-12 18:55:51

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4,5-Dichloro-2-methylpyridazin-3-one Properties

Melting point	87-91 °C(lit.)
Boiling point	197.2±50.0 °C(Predicted)
Density	1.55±0.1 g/cm3(Predicted)
storage temp.	under inert gas (nitrogen or Argon) at 2-8°C
solubility	soluble in Ethanol
form	powder to crystal
pka	-3.57±0.20(Predicted)
color	White to Orange to Green
InChI	InChI=1S/C5H4Cl2N2O/c1-9-5(10)4(7)3(6)2-8-9/h2H,1H3
InChIKey	ACKBTCUMGAHRIE-UHFFFAOYSA-N
SMILES	C1(=O)N(C)N=CC(Cl)=C1Cl
UNSPSC Code	12352100
NACRES	NA.22

SAFETY

Risk and Safety Statements

Symbol(GHS)

GHS06

Signal word

Danger

Hazard statements

H301-H315-H317-H319-H335

Precautionary statements

P280-P301+P310+P330-P302+P352-P305+P351+P338

target organs

Respiratory system

PPE

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

Hazard Codes

Risk Statements

22-36/37/38-43

Safety Statements

26-36

RIDADR

UN 2811 6.1/PG 3

WGK Germany

RTECS

UR6188000

HazardClass

6.1

HS Code

29339980

Storage Class

6.1C - Combustible acute toxic Cat.3
toxic compounds or compounds which causing chronic effects

Hazard Classifications

Acute Tox. 3 Oral
Eye Irrit. 2
Skin Irrit. 2
Skin Sens. 1
STOT SE 3

Limited Quantities

5.0 kg (11 lbs) (solid)

Excepted Quantities

Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L)

NFPA 704

	1
2		0

4,5-Dichloro-2-methylpyridazin-3-one price More Price(75)

Manufacturer	Product number	Product description	CAS number	Packaging	Price	Updated	Buy
Sigma-Aldrich	597716	4,5-Dichloro-2-methyl-3(2H)-pyridazinone 97%	933-76-6	5g	$149	2023-06-20	Buy
TCI Chemical	D5324	4,5-Dichloro-2-methyl-3(2H)-pyridazinone >98.0%(GC)	933-76-6	1g	$20	2026-04-30	Buy
TCI Chemical	D5324	4,5-Dichloro-2-methyl-3(2H)-pyridazinone >98.0%(GC)	933-76-6	5g	$80	2026-04-30	Buy
Usbiological	273435	4,5-Dichloro-2-methyl-3(2H)-pyridazinone Asreported	933-76-6	5g	$398	2026-06-03	Buy
Usbiological	273435	4,5-Dichloro-2-methyl-3(2H)-pyridazinone Asreported	933-76-6	10g	$608	2026-06-03	Buy

Product number	Packaging	Price	Buy
597716	5g	$149	Buy
D5324	1g	$20	Buy
D5324	5g	$80	Buy
273435	5g	$398	Buy
273435	10g	$608	Buy

4,5-Dichloro-2-methylpyridazin-3-one Chemical Properties, Uses, Production

Chemical Properties

Off-white to yellow low crystalline powder

Uses

4,5-Dichloro-2-methyl-3(2H)-pyridazinone can be used in the synthesis of 4-amino-3(2H)-pyridazinones and 5-amino-3(2H)-pyridazinones via reaction with N-benzylaminoethanol.

Definition

ChEBI: 4,5-Dichloro-2-methyl-3(2H)-pyridazinone is a pyridazinone.

Synthesis

932-22-9

74-88-4

933-76-6

Step 1: A round bottom flask was charged with 4,5-dichloropyridazin-3(2H)-one (10.0 g, 60.6 mmol), potassium carbonate (16.8 g, 121.2 mmol), iodomethane (4.0 mL, 64.3 mmol) and acetonitrile (80 mL). The reaction mixture was heated to reflux for 12 hours and then cooled to room temperature. After completion of the reaction, the mixture was filtered and the filtrate was concentrated. The residue was purified by column chromatography (dichloromethane as eluent) to afford 4,5-dichloro-2-methylpyridazin-3-one 8.21 g (76% yield). The product was confirmed by 1H NMR (400 MHz, DMSO-d6): δ 8.18 (s, 1H), 3.70 (s, 3H); mass spectrum (m/z) = 179 ([M+H]+).

References

[1] Patent: WO2009/142732, 2009, A2. Location in patent: Page/Page column 61-62
[2] Patent: WO2011/15629, 2011, A1. Location in patent: Page/Page column 46; 47
[3] Journal of Heterocyclic Chemistry, 1996, vol. 33, # 6, p. 1579 - 1582
[4] Patent: WO2013/50421, 2013, A1. Location in patent: Page/Page column 37
[5] Journal of the Korean Chemical Society, 2014, vol. 58, # 1, p. 140 - 144

4,5-Dichloro-2-methylpyridazin-3-one Preparation Products And Raw materials

Raw materials

Mucochloric acid 4,5-Dichloro-3(2H)-pyridazinone 3,4-dichloro-5-hydroxyfuran-2(5H)-one Iodomethane Methylhydrazine

Acetonitrile Potassium carbonate

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Preparation Products

5-Iodo-2-Methylpyridazin-3(2h)-one

4,5-Dichloro-2-methylpyridazin-3-one Suppliers

Global Suppliers ( 140)

Supplier	Tel	Email	Country	ProdList	Advantage
Tianyuan Natural Product Co.,Ltd.	028-85012281 13808177790	xianlihong8888@163.com	China	45	62
Nanbu County Chengxin Technology Co., Ltd.	0838-5675166 15883665058	nbcxkj@126.com	China	956	55
Meryer (Shanghai) Chemical Technology Co., Ltd.	4006356688 18621169109	market03@meryer.com	China	40202	62
Capot Chemical Co., Ltd	+86 (0) 571 85 58 67 18		China	18187	66
Jia Xing Isenchem Co.,Ltd	0573-85285100 18627885956	isenchem@163.com	China	9389	66
Pure Chemistry Scientific Inc.	001-857-928-2050 or 1-888-588-9418	sales@chemreagents.com	United States	10174	62
Shanghai Hanhong Scientific Co.,Ltd.	021-54306202 13764082696	info@hanhongsci.com	China	42917	64
China DongFan Chemical Co.,LTD	86-0571-85151182		China	5681	66
Shanghai Hope Chem Co., Ltd.，	+21-18501659228 18501659228	info@hope-chem.com	China	538	55
Thermo Fisher Scientific	800-810-5118	cnchemical@thermofisher.com	China	17752	75

Supplier	Advantage
Tianyuan Natural Product Co.,Ltd.	62
Nanbu County Chengxin Technology Co., Ltd.	55
Meryer (Shanghai) Chemical Technology Co., Ltd.	62
Capot Chemical Co., Ltd	66
Jia Xing Isenchem Co.,Ltd	66
Pure Chemistry Scientific Inc.	62
Shanghai Hanhong Scientific Co.,Ltd.	64
China DongFan Chemical Co.,LTD	66
Shanghai Hope Chem Co., Ltd.，	55
Thermo Fisher Scientific	75

View Latest Price from 4,5-Dichloro-2-methylpyridazin-3-one manufacturers

Update time	Product	Price	Min. Order	Purity	Supply Ability	Manufacturer
2022-01-04	4,5-Dichloro-2-Methylpyridazin-3-one 933-76-6		1g	98%minHPLC	100kgs/month	Shanghai Rlavie Technology Co ltd
2020-04-30	4,5-Dichloro-2-Methylpyridazin-3-one 933-76-6	$1.00	1KG	99%	20T	Shaanxi Dideu Medichem Co. Ltd
2019-07-06	4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE 933-76-6	$1.00	1KG	98%	150KG	Career Henan Chemical Co

4,5-Dichloro-2-Methylpyridazin-3-one
933-76-6
98%minHPLC
Shanghai Rlavie Technology Co ltd

4,5-Dichloro-2-Methylpyridazin-3-one
933-76-6
$1.00
99%
Shaanxi Dideu Medichem Co. Ltd

4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE
933-76-6
$1.00
98%
Career Henan Chemical Co

4,5-Dichloro-2-methylpyridazin-3-one Spectrum

4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE(933-76-6)¹HNMR

933-76-6 (4,5-Dichloro-2-methylpyridazin-3-one) Related Search:

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4,5-dichloro-2-methyl-3(2h)-pyridazinon 4,5-DICHLORO-2-METHYLPYRIDAZIN-3[2H]-ONE 4,5-DICHLORO-2-METHYLPYRIDAZINE-3(2H)-ONE 4,5-DICHLORO-2-METHYL-2,3-DIHYDROPYRIDAZIN-3-ONE 4,5-DICHLORO-2-METHYL-2H-PYRIDAZIN-3-ONE 4,5-DICHLORO-2-METHYL-3(2H)-PYRIDAZINONE AKOS B029262 4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE, 9& 4,5-DICHLORO-2-METHYLPYRIDAZIN-3[2H]-ONE 98% 4,5-Dichloro-2-methylpyridazin-32Hü-one, 98% 4,5-Dichloro-2-methyl-3(2H)-pyridazinone,97% 5-Dichloro-2-Methyl-3(2H)-pyridazinone Emorfazone int CCM, 4,5-Dichloro-2,3-dihydro-2-methylpyridazin-3-one 4,5-Dichloro-2,3-dihydro-2-methyl-3-oxopyridazine, 4,5-Dichloro-2,3-dihydro-2-methyl-3-oxo-1,2-diazine 2-Methyl-4,5-dichloro-3-pyridazinone 4,5-dichloro-2-methylpyridazine-3-one 3(2H)-Pyridazinone, 4,5-dichloro-2-methyl- 4,5-DICHLORO-2-METHYLPYRIDAZIN-3-ONE ISO 9001：2015 REACH 5-Dichloro-2-methylpyridazin-3(2H)-one 4,5-Dichloro-2-methyl-3(2H)-pyridazinone 4,5-Dichloro-2-methylpyridazin-3-one 933-76-6 933-76-3 Building Blocks Pyridazines Halogenated Heterocycles Heterocyclic Building Blocks Building Blocks Chemical Synthesis Halogenated Heterocycles Heterocyclic Building Blocks Pyridazines Halides Pyrazines, Pyrimidines & Pyridazines Pyrazines, Pyrimidines & Pyridazines