1-(1H-PYRAZOL-5-YL)ETHAN-1-ONE HYDROCHLORIDE

Modify Date: 2026-07-01 16:31:02

1-(1H-PYRAZOL-5-YL)ETHAN-1-ONE HYDROCHLORIDE Structure
1-(1H-PYRAZOL-5-YL)ETHAN-1-ONE HYDROCHLORIDE structure
Common Name 1-(1H-PYRAZOL-5-YL)ETHAN-1-ONE HYDROCHLORIDE
CAS Number 175277-40-4 Molecular Weight 146.575
Density 1.19g/cm3 Boiling Point 277.7ºC at 760mmHg
Molecular Formula C5H7ClN2O Melting Point 150ºC
MSDS N/A Flash Point 125.9ºC

Summary: 1-(1H-吡唑-5-基)-1-乙酮盐酸盐 (1-(2H-Pyrazol-3-yl)ethanone hydrochloride, CAS: 175277-40-4), with molecular formula C5H7ClN2O and molecular weight 146.575. The melting point is 150ºC, and the boiling point is 277.7ºC at 760mmHg. For research-use only, not for medical or clinical usage.


 Names

This table lists Chinese names, IUPAC names and various aliases of this chemical substance.

Name 1-(2H-Pyrazol-3-yl)ethanone hydrochloride
Synonym More Synonyms

 Chemical & Physical Properties

This table shows physicochemical parameters including melting point, boiling point, density, solubility and optical rotation. Missing data is marked as N/A.

Density 1.19g/cm3
Boiling Point 277.7ºC at 760mmHg
Melting Point 150ºC
Molecular Formula C5H7ClN2O
Molecular Weight 146.575
Flash Point 125.9ºC
Exact Mass 146.024689
PSA 45.75000
LogP 1.41430
Vapour Pressure 0.00446mmHg at 25°C
InChIKey MTFWBEDWXAHBNR-UHFFFAOYSA-N
SMILES CC(=O)c1ccn[nH]1.Cl

 MSDS

This table provides MSDS information including hazard classification, first‑aid, fire‑fighting, spill handling, operation and storage instructions.

Name: 1-(1h-pyrazol-5-yl)ethan-1-one hydrochloride 95+% Material Safety Data Sheet
Synonym:
CAS: 175277-40-4
Section 1 - Chemical Product MSDS Name:1-(1h-pyrazol-5-yl)ethan-1-one hydrochloride 95+% Material Safety Data Sheet
Synonym:

Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
CAS# Chemical Name content EINECS#
175277-40-4 1-(1H-Pyrazol-5-yl)ethan-1-one hydroch 95+% unlisted
Hazard Symbols: XI
Risk Phrases: 36/37/38

Section 3 - HAZARDS IDENTIFICATION
EMERGENCY OVERVIEW
Irritating to eyes, respiratory system and skin.Hygroscopic (absorbs moisture from the air).
Potential Health Effects
Eye:
Causes eye irritation.
Skin:
Causes skin irritation. May be harmful if absorbed through the skin.
Ingestion:
May cause irritation of the digestive tract. May be harmful if swallowed.
Inhalation:
Causes respiratory tract irritation. May be harmful if inhaled.
Chronic:
Not available.

Section 4 - FIRST AID MEASURES
Eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
Skin:
Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Ingestion:
Get medical aid. Wash mouth out with water.
Inhalation:
Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:
Treat symptomatically and supportively.

Section 5 - FIRE FIGHTING MEASURES
General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear.
Extinguishing Media:
Use water spray, dry chemical, carbon dioxide, or chemical foam.

Section 6 - ACCIDENTAL RELEASE MEASURES
General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Vacuum or sweep up material and place into a suitable disposal container.

Section 7 - HANDLING and STORAGE
Handling:
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Storage:
Store in a cool, dry place. Store in a tightly closed container.
Store under an inert atmosphere.

Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
Engineering Controls:
Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low.
Exposure Limits CAS# 175277-40-4: Personal Protective Equipment Eyes: Not available.
Skin:
Wear appropriate protective gloves to prevent skin exposure.
Clothing:
Wear appropriate protective clothing to prevent skin exposure.
Respirators:
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

Section 9 - PHYSICAL AND CHEMICAL PROPERTIES

Physical State: Solid
Color: beige
Odor: Not available.
pH: Not available.
Vapor Pressure: Not available.
Viscosity: Not available.
Boiling Point: Not available.
Freezing/Melting Point: 150 deg C
Autoignition Temperature: Not available.
Flash Point: Not available.
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature:
Solubility in water:
Specific Gravity/Density:
Molecular Formula: C5H7ClN2O
Molecular Weight: 147

Section 10 - STABILITY AND REACTIVITY
Chemical Stability:
Not available.
Conditions to Avoid:
Incompatible materials, exposure to moist air or water.
Incompatibilities with Other Materials:
Oxidizing agents, reducing agents, bases, amines.
Hazardous Decomposition Products:
Hydrogen chloride, chlorine, hydrogen cyanide, nitrogen oxides, carbon monoxide, carbon dioxide.
Hazardous Polymerization: Has not been reported

Section 11 - TOXICOLOGICAL INFORMATION
RTECS#:
CAS# 175277-40-4 unlisted.
LD50/LC50:
Not available.
Carcinogenicity:
1-(1H-Pyrazol-5-yl)ethan-1-one hydrochloride - Not listed by ACGIH, IARC, or NTP.

Section 12 - ECOLOGICAL INFORMATION


Section 13 - DISPOSAL CONSIDERATIONS
Dispose of in a manner consistent with federal, state, and local regulations.

Section 14 - TRANSPORT INFORMATION

IATA
No information available.
IMO
No information available.
RID/ADR
No information available.

Section 15 - REGULATORY INFORMATION

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: XI
Risk Phrases:
R 36/37/38 Irritating to eyes, respiratory system
and skin.
Safety Phrases:
S 26 In case of contact with eyes, rinse immediately
with plenty of water and seek medical advice.
S 37/39 Wear suitable gloves and eye/face
protection.
WGK (Water Danger/Protection)
CAS# 175277-40-4: No information available.
Canada
None of the chemicals in this product are listed on the DSL/NDSL list.
CAS# 175277-40-4 is not listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 175277-40-4 is not listed on the TSCA inventory.
It is for research and development use only.


SECTION 16 - ADDITIONAL INFORMATION
N/A

 Safety Information

This table covers safety warnings, protective measures, incompatible substances and disposal guidelines for this compound.

Hazard Codes Xi: Irritant;
Risk Phrases R36/37/38
Safety Phrases 26-36/37/39
HS Code 2933199090

 Precursor & DownStream

This table lists upstream starting materials and downstream derivative products related to this chemical.

Precursor  0

DownStream  1

 Customs

This table shows customs‑related data including HS‑code, tariff and regulatory conditions for import and export.

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%

 Synonyms

This table collects all English aliases, systematic names and CAS‑related synonyms of the compound.

1-(1H-pyrazol-5-yl)ethanone hydrochloride
Ethanone, 1-(1H-pyrazol-5-yl)-, hydrochloride (1:1)
1-(1H-pyrazol-5-yl)ethanone,hydrochloride
1-(1H-Pyrazol-5-yl)ethanone hydrochloride (1:1)
1-(1H-PYRAZOL-5-YL)ETHAN-1-ONE HYDROCHLORIDE

  | FAQ

This section contains frequently‑asked‑questions about this compound, including basic parameters, properties, storage conditions and corresponding answers.

Q: What is the English name of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: The English name of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is 1-(2H-Pyrazol-3-yl)ethanone hydrochloride.
Q: What are the downstream products of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: Related downstream products(CAS) of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride: 827316-54-1.
Q: What is the safety information for 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: Safety information for 1-(2H-Pyrazol-3-yl)ethanone hydrochloride: 26-36/37/39.
Q: What is the CAS number of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: CAS number of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is 175277-40-4.
Q: What is the molecular formula of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: Molecular formula of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is C5H7ClN2O.
Q: What is the polar surface area (PSA) of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: Polar surface area (PSA) of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is 45.75000.
Q: What is the LogP of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: LogP of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is 1.41430.
Q: What is the InChIKey of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: InChIKey of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is MTFWBEDWXAHBNR-UHFFFAOYSA-N.
Q: What is the boiling point of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: Boiling point of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is 277.7ºC at 760mmHg.
Q: What is the molecular weight of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride?
A: Molecular weight of 1-(2H-Pyrazol-3-yl)ethanone hydrochloride is 146.575.

 factory

This table lists manufacturers and suppliers of this compound, including vendor names and product supply reference information.

Shanghai Nianxing Industrial Co., Ltd
Dayang Chem (Hangzhou) Co., Ltd.
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