Shanghai Nianxing Industrial Co., Ltd
China
Product Name: Palmitic acid
Price: Check
Purity: 98.0%
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Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: 3-Methyl-2-pyrazolin-5-one
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
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Zhongshan Xingrui Chemical Co. , Ltd.
China
Product Name: 3-methyl-2-pyrazolin-5-one
Price: ￥Inquiry/25kg
Purity: 99.0%
Stocking Period: Inquiry
Contact: Wang Jie
Email: 3096638339@qq.com

108-26-9

108-26-9 structure

108-26-9 structure

Name: 3-methyl-2-pyrazolin-5-one
Chemical Name: 3-Methyl-2-pyrazolin-5-one
CAS Number: 108-26-9
Molecular Formula: C₄H₆N₂O
Molecular Weight: 98.103
Create Date: 2018-07-23 08:05:09
Modify Date: 2026-07-01 19:08:21

Name	3-Methyl-2-pyrazolin-5-one
Synonyms	3-methyl-2-pyrazolin-5-on Methyl-5-pyrazolone 3-Methyl-pyrazolon 3-Methyl-5-pyrazolone 2,4-dihydro-5-methyl-3H-pyrazol-3-one 5-Methyl-3H-pyrazol-3-one 5-methyl-1,2-dihydro-pyrazol-3-one 3-methyl-1,4-dihydropyrazol-5-one 3-METHYL-2-PYRAZOLIN-5-ONE 5-pyrazoL 3-Methyl-5-pyrazolone> 3-METHYL-5-PYRAZOLONE 5-Methyl-2,4-dihydro-pyrazol-3-one TIMTEC-BB SBB004372 2,4-dihydro-5-methyl-3h-pyrazol-3-on 3-Methyl-5-oxo-2-pyrazoline MFCD00020699 3-METHYL-4,5-DIHYDRO-1H-PYRAZOL-5-ONE 3-Methyl-4,5-dihydro-1H-pyrazole-5-one 3-Methyl-1H-pyrazol-5(4H)-one 2-Pyrazolin-5-one, 3-methyl 2,4-Dihydro-5-methyl-3H-pyrazol-3-one AURORA KA-6219 5-Methyl-2,4-dihydro-3H-pyrazole-3-one 3-methyl pyrazole-5-one EINECS 203-565-3 5-Methyl-2,4-dihydro-3H-pyrazol-3-one

Density	1.3±0.1 g/cm3
Boiling Point	309.7ºC at 760 mmHg
Melting Point	220-224 °C
Molecular Formula	C₄H₆N₂O
Molecular Weight	98.103
Flash Point	141.1ºC
Exact Mass	98.048012
PSA	41.46000
LogP	-1.08
Vapour Pressure	0.000345mmHg at 25°C
Index of Refraction	1.599
Storage condition	2~8°C

CHEMICAL IDENTIFICATION

RTECS NUMBER :: UQ9451500

CHEMICAL NAME :: 2-Pyrazolin-5-one, 3-methyl-

CAS REGISTRY NUMBER :: 108-26-9

LAST UPDATED :: 199701

DATA ITEMS CITED :: 2

MOLECULAR FORMULA :: C4-H6-N2-O

MOLECULAR WEIGHT :: 98.12

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Unreported

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 600 mg/kg

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

REFERENCE :: BCPCA6 Biochemical Pharmacology. (Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, NY 10523) V.1- 1958- Volume(issue)/page/year: 14,1325,1965

Personal Protective Equipment	Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter
Hazard Codes	Xi
Risk Phrases	36/37/38
Safety Phrases	S24/25
RIDADR	NONH for all modes of transport
RTECS	UQ9451500
HS Code	2933199090

Precursor 9
141-97-9 104-88-1 109-77-3 100-63-0
115479-07-7 54-85-3 603-69-0 27991-08-8
105-45-3
DownStream 10
33549-66-5 19364-68-2 86-92-0 3201-28-3
23326-27-4 4344-72-3 107-92-6 13572-24-2
81905-05-7 1929-18-6

HS Code	2933199090
Summary	2933199090. other compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

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