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1,3-Dimethyl-5-hydroxypyrazole

1,3-Dimethyl-5-hydroxypyrazole Structure
1,3-Dimethyl-5-hydroxypyrazole structure
CAS No.
5203-77-0
Chemical Name:
1,3-Dimethyl-5-hydroxypyrazole
Synonyms
1,3-DIMETHYL-1H-PYRAZOL-5-OL;2,5-Dimethyl-2H-pyrazol-3-ol;2,5-DIMETHYL-3-PYRAZOLOL;2,5-dimethyl-1H-pyrazol-3-one;5-Hydroxy-1,3-dimethylpyrazole;1H-Pyrazol-5-ol, 1,3-dimethyl-;1，3-dimethyl-1 H-pyrazol-5-one;1,3-DIMETHYL-1H-PYRAZOLE-5-ONE;1,3-Dimethyl-5-hydroxypyrazole;2,5-Dimethyl-1,2-dihydropyrazol-3-one
CBNumber:
CB8147288
Molecular Formula:
C5H8N2O
Molecular Weight:
112.13
MDL Number:
MFCD00129673
MOL File:
5203-77-0.mol
Last updated:2026-08-28 09:47:28
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1,3-Dimethyl-5-hydroxypyrazole Properties

Melting point 113-117°C
Boiling point 226°C
Density 1.17
Flash point 90°C
storage temp. Sealed in dry,Room Temperature
pka 9.19±0.28(Predicted)
Appearance Off-white to pink Solid

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H302-H315-H319-H332-H335
Precautionary statements  P261-P280-P305+P351+P338
Hazard Codes  Xn
Risk Statements  22
HS Code  2933199090

1,3-Dimethyl-5-hydroxypyrazole price More Price(49)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
AstaTech 60058 2,5-DIMETHYL-3-PYRAZOLOL 97% 5203-77-0 1G $27 2026-04-30 Buy
Apolloscientific OR346439 2,5-Dimethyl-2H-pyrazol-3-ol 95% 5203-77-0 1g $39 2026-06-04 Buy
Apolloscientific OR346439 2,5-Dimethyl-2H-pyrazol-3-ol 95% 5203-77-0 5g $48 2026-06-04 Buy
Activate Scientific AS32618 1,3-Dimethyl-1H-pyrazol-5-ol 97% 5203-77-0 5g $24 2026-06-04 Buy
Apolloscientific OR346439 2,5-Dimethyl-2H-pyrazol-3-ol 95% 5203-77-0 10g $55 2026-06-04 Buy
Product number Packaging Price Buy
60058 1G $27 Buy
OR346439 1g $39 Buy
OR346439 5g $48 Buy
AS32618 5g $24 Buy
OR346439 10g $55 Buy

1,3-Dimethyl-5-hydroxypyrazole Chemical Properties,Uses,Production

Chemical Properties

white to light yellow crystal powde

Uses

1,3-Dimethyl-5-hydroxypyrazole is an intermediate in the synthesis of the acaricide pyridaben.

Synthesis

Ethyl acetoacetate

141-97-9

Methylhydrazine

60-34-4

1,3-Dimethyl-5-hydroxypyrazole

5203-77-0

3.16 General procedure for the synthesis of 1-methyl-1H-pyrazol-5-ol (25a): a solution of methylhydrazine (2b) (0.57 mL, 10.9 mmol) in toluene (PhMe) (2 mL) was slowly added dropwise to a solution of ethyl acetoacetate (24) (1.39 mL, 10.9 mmol) in toluene (PhMe) (3 mL). The reaction mixture was stirred at room temperature for 5 min before the solvent was removed by vacuum evaporation. The product was purified by recrystallization (methanol/ethyl acetate mixed solvent) to give 1,3-dimethyl-5-hydroxypyrazole (0.90 g, 74% yield) as a light yellow solid with a melting point of 112-115°C (literature value: 112.5-113.5°C) (measured value: 113.0709). Molecular formula C5H9N2O [MH] Calculated value: 113.0709; FTIR (KBr) νmax/cm-1: 1549, 1269, 1185, 1034; 1H NMR (400 MHz, CDCl3) δ: 3.21 (3H, s, Me), 3.11 (2H, s, CH2), 2.02 (3H, s, 3-Me ); 13C NMR (100 MHz, CDCl3) δ: 172.2 (C), 155.5 (C), 41.4 (CH2), 31.0 (Me), 16.9 (Me); LRMS (APcI) m/z (Relative Intensity): 113 (MH+, 100).

References

[1] Tetrahedron, 2013, vol. 69, # 39, p. 8429 - 8438
[2] Letters in Drug Design and Discovery, 2016, vol. 13, # 8, p. 800 - 808
[3] Bioorganic and Medicinal Chemistry Letters, 2006, vol. 16, # 10, p. 2590 - 2594

1,3-Dimethyl-5-hydroxypyrazole Preparation Products And Raw materials

Raw materials

Ethyl acetoacetate methyl hydrazine Ethanol Methylhydrazine Methyl acetoacetate

Preparation Products

1,3-Dimethyl-5-hydroxypyrazole Suppliers

Global( 138)Suppliers
Supplier Tel Email Country ProdList Advantage
Shandong Mingde Biotechnology Co., Ltd. 18560864701 2037956468@qq.com China 831 58
Henan yingchuang 16650708709 hnyingchuang@163.com China 3978 58
Changsha Luxing Bio-Chem Technology Co., Ltd. 0731-88827538 15574813303 luxingbc@126.com China 1975 65
future industrial shanghai co., ltd 400-0066400 13621662912 sales@jonln.com China 1989 65
Energy Chemical 400-0056266 sales8178@energy-chemical.com China 44850 61
Capot Chemical Co., Ltd +86 (0) 571 85 58 67 18 China 18187 66
Accela ChemBio Co.,Ltd. 021-50795510 4000665055 marketing@accelachem.com China 10972 64
ZEROSCHEM.CO.,LTD. 10-61256048 13810278579; sales@zeroschem.com China 1399 59
T&W GROUP 021-61551611 13296011611 contact@trustwe.com China 9884 58
Suzhou Sibian Chemical Technology Co.,Ltd. 0512-65617459 18915409046 sales@sibian-chem.com China 1917 55
Supplier Advantage
Shandong Mingde Biotechnology Co., Ltd. 58
Henan yingchuang 58
Changsha Luxing Bio-Chem Technology Co., Ltd. 65
future industrial shanghai co., ltd 65
Energy Chemical 61
Capot Chemical Co., Ltd 66
Accela ChemBio Co.,Ltd. 64
ZEROSCHEM.CO.,LTD. 59
T&W GROUP 58
Suzhou Sibian Chemical Technology Co.,Ltd. 55

View Lastest Price from 1,3-Dimethyl-5-hydroxypyrazole manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
1,3-Dimethyl-5-hydroxypyrazole pictures 2019-12-25 1,3-Dimethyl-5-hydroxypyrazole
5203-77-0
 $1.00 1KG 99% 200kg Career Henan Chemical Co

1,3-Dimethyl-5-hydroxypyrazole Spectrum

1,3-Dimethyl-5-hydroxypyrazole(5203-77-0)1HNMR1,3-Dimethyl-5-hydroxypyrazole(5203-77-0)1HNMR

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5-Hydroxy-1,3-dimethylpyrazole 2,5-Dimethyl-1,2-dihydropyrazol-3-one 1,3-Dimethyl-5-hydroxypyrazole 1,3-DIMETHYL-1H-PYRAZOLE-5-ONE 2,5-DIMETHYL-3-PYRAZOLOL 1，3-dimethyl-1 H-pyrazol-5-one 2,5-dimethyl-1H-pyrazol-3-one 1H-Pyrazol-5-ol, 1,3-dimethyl- 1,3-DIMETHYL-1H-PYRAZOL-5-OL 2,5-Dimethyl-2H-pyrazol-3-ol 5203-77-0 Pyrazole