Shanghai Nianxing Industrial Co., Ltd
China
Product Name: 4,5-Dichloro-2-methyl-2H-pyridazin-3-one
Price: Check
Purity: 98.0%
Stocking Period: 10 Day
Contact: Yang
Email: sales@echemcloud.com

Shanghai Jizhi Biochemical Technology Co., Ltd
China
Product Name: 4,5-Dichloro-2-methyl-2H-pyridazin-3-one
Price: ￥338.0/5g ￥2998.0/100g ￥558.0/10g ￥10478.0/500g
Purity: 98.0%
Stocking Period: 1 Day
Contact: Liu jia
Email: 2130147988@qq.com

Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: 4,5-Dichloro-2-methylpyridazin-3-one
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
Stocking Period: Inquiry
Contact: Ms Wang
Email: enquiry@dycnchem.com

933-76-6

933-76-6 structure

Name: 4,5-Dichloro-2-methyl-2H-pyridazin-3-one
Chemical Name: 4,5-Dichloro-2-Methylpyridazin-3-One
CAS Number: 933-76-6
Molecular Formula: C₅H₄Cl₂N₂O
Molecular Weight: 179.004
Catalog: Pharmaceutical intermediate Heterocyclic compound Pyridazine
Create Date: 2018-10-19 15:26:12
Modify Date: 2025-08-27 13:33:12

Name	4,5-Dichloro-2-Methylpyridazin-3-One
Synonyms	4,5-Dichloro-2-methyl-3(2H)-pyridazinone 4,5-dichloro-2-methylpyridazin-3(2H)-one MFCD00051686 3(2H)-Pyridazinone, 4,5-dichloro-2-methyl- 4,5-dichloro-2-methylpyridazin-3-one 4,5-Dichloro-2-methyl-2H-pyridazin-3-one

Density	1.6±0.1 g/cm3
Boiling Point	197.2±50.0 °C at 760 mmHg
Melting Point	87-91ºC(lit.)
Molecular Formula	C₅H₄Cl₂N₂O
Molecular Weight	179.004
Flash Point	73.1±30.1 °C
Exact Mass	177.970062
PSA	34.89000
LogP	-0.34
Vapour Pressure	0.4±0.4 mmHg at 25°C
Index of Refraction	1.612
Storage condition	2-8°C

CHEMICAL IDENTIFICATION

RTECS NUMBER :: UR6188000

CHEMICAL NAME :: 3(2H)-Pyridazinone, 4,5-dichloro-2-methyl-

CAS REGISTRY NUMBER :: 933-76-6

BEILSTEIN REFERENCE NO. :: 0127609

LAST UPDATED :: 199612

DATA ITEMS CITED :: 2

MOLECULAR FORMULA :: C5-H4-Cl2-N2-O

MOLECULAR WEIGHT :: 179.01

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LD - Lethal dose

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: >1 gm/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: FRPSAX Farmaco, Edizione Scientifica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 40,921,1985

TYPE OF TEST :: LD - Lethal dose

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: >300 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: FRPSAX Farmaco, Edizione Scientifica. (Casella Postale 227, 27100 Pavia, Italy) V.8-43 1953-88 For publisher information, see FRMCE8 Volume(issue)/page/year: 40,921,1985

Symbol	GHS06
Signal Word	Danger
Hazard Statements	H301-H315-H317-H319-H335
Precautionary Statements	P261-P280-P301 + P310-P305 + P351 + P338
Personal Protective Equipment	dust mask type N95 (US);Eyeshields;Faceshields;Gloves
Hazard Codes	Xn: Harmful;
Risk Phrases	R22
Safety Phrases	26-36
RIDADR	UN 2811 6.1/PG 3
WGK Germany	3
RTECS	UR6188000
Hazard Class	6.1
HS Code	2933990090

932-22-9

74-88-4

~74%

933-76-6

Literature: CEPHALON, INC. Patent: WO2009/142732 A2, 2009 ; Location in patent: Page/Page column 61-62 ; WO 2009/142732 A2

87-56-9

60-34-4

~90%

933-76-6

Literature: Hergenrother, Paul J.; Putt, Karson S.; Liu, Xianjun Patent: US2007/32496 A1, 2007 ; Location in patent: Page/Page column 13 ;

608-42-4

60-34-4

~74%

933-76-6

Literature: Chen, Shih-Fong; Panzica, Raymond P. Journal of Organic Chemistry, 1981 , vol. 46, # 12 p. 2467 - 2473

51355-97-6

74-88-4

~95%

933-76-6

Literature: Kim, Sung-Kyu; Cho, Su-Dong; Kweon, Deok-Heon; Lee, Sang-Gyeong; Chung, Joo-Wha; Shin, Sung Chul; Yoon, Yong-Jin Journal of Heterocyclic Chemistry, 1996 , vol. 33, # 2 p. 245 - 248