Pyrazole

Modify Date: 2025-08-20 19:47:35

Pyrazole Structure
Pyrazole structure
 Common Name Pyrazole
CAS Number 288-13-1 Molecular Weight 68.077
Density 1.1±0.1 g/cm3 Boiling Point 187.0±9.0 °C at 760 mmHg
Molecular Formula C3H4N2 Melting Point 67-70 °C(lit.)
MSDS Chinese USA Flash Point 87.5±11.7 °C
Symbol GHS07
GHS07		 Signal Word Warning

 Names

Name 1H-pyrazole
Synonym More Synonyms

 Chemical & Physical Properties

Density 1.1±0.1 g/cm3
Boiling Point 187.0±9.0 °C at 760 mmHg
Melting Point 67-70 °C(lit.)
Molecular Formula C3H4N2
Molecular Weight 68.077
Flash Point 87.5±11.7 °C
Exact Mass 68.037445
PSA 28.68000
LogP 0.32
Vapour Pressure 0.9±0.3 mmHg at 25°C
Index of Refraction 1.528
Water Solubility SOLUBLE

 Toxicological Information

CHEMICAL IDENTIFICATION

RTECS NUMBER :
UQ4900000
CHEMICAL NAME :
Pyrazole
CAS REGISTRY NUMBER :
288-13-1
LAST UPDATED :
199803
DATA ITEMS CITED :
18
MOLECULAR FORMULA :
C3-H4-N2
MOLECULAR WEIGHT :
68.09
WISWESSER LINE NOTATION :
T5MNJ

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
1010 mg/kg
TOXIC EFFECTS :
Behavioral - coma Liver - hepatitis (hepatocellular necrosis), zonal Liver - fatty liver degeneration
REFERENCE :
EXPEAM Experientia. (Birkhaeuser Verlag, POB 133, CH-4010 Basel, Switzerland) V.1- 1945- Volume(issue)/page/year: 25,816,1969
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
900 mg/kg
TOXIC EFFECTS :
Tumorigenic - active as anti-cancer agent
REFERENCE :
JPMSAE Journal of Pharmaceutical Sciences. (American Pharmaceutical Assoc., 2215 Constitution Ave., NW, Washington, DC 20037) V.50- 1961- Volume(issue)/page/year: 57,537,1968
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
1021 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
EXPEAM Experientia. (Birkhaeuser Verlag, POB 133, CH-4010 Basel, Switzerland) V.1- 1945- Volume(issue)/page/year: 28,1198,1972
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
409 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
EXPEAM Experientia. (Birkhaeuser Verlag, POB 133, CH-4010 Basel, Switzerland) V.1- 1945- Volume(issue)/page/year: 28,1198,1972
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
538 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
JPETAB Journal of Pharmacology and Experimental Therapeutics. (Williams & Wilkins Co., 428 E. Preston St., Baltimore, MD 21202) V.1- 1909/10- Volume(issue)/page/year: 178,199,1971
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
374 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
EXPEAM Experientia. (Birkhaeuser Verlag, POB 133, CH-4010 Basel, Switzerland) V.1- 1945- Volume(issue)/page/year: 28,1198,1972
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Mammal - dog
DOSE/DURATION :
175 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
INNDDK Investigational New Drugs. The Journal of New Anticancer Agents. Kluwer Academic Pub., POB 358, Accord Stn., Hingham, MA 02018) V.1- 1983- Volume(issue)/page/year: 6,305,1988 ** OTHER MULTIPLE DOSE TOXICITY DATA **
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
1904 mg/kg/4W-I
TOXIC EFFECTS :
Endocrine - changes in thyroid weight Blood - pigmented or nucleated red blood cells Nutritional and Gross Metabolic - weight loss or decreased weight gain
REFERENCE :
EXPEAM Experientia. (Birkhaeuser Verlag, POB 133, CH-4010 Basel, Switzerland) V.1- 1945- Volume(issue)/page/year: 28,1198,1972
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
60 mg/kg/4D-I
TOXIC EFFECTS :
Brain and Coverings - other degenerative changes Behavioral - fluid intake Biochemical - Neurotransmitters or modulators (putative) - catecholamine levels in sympathetic nerves
REFERENCE :
APTOA6 Acta Pharmacologica et Toxicologica. (Copenhagen, Denmark) V.1-59, 1945-86. For publisher information, see PHTOEH Volume(issue)/page/year: 39,513,1976
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
400 mg/kg/4D-I
TOXIC EFFECTS :
Liver - other changes Liver - changes in liver weight Biochemical - Enzyme inhibition, induction, or change in blood or tissue levels - multiple enzyme effects
REFERENCE :
TXCYAC Toxicology. (Elsevier Scientific Pub. Ireland, Ltd., POB 85, Limerick, Ireland) V.1- 1973- Volume(issue)/page/year: 8,251,1977
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
60 mg/kg/4D-I
TOXIC EFFECTS :
Brain and Coverings - other degenerative changes Biochemical - Neurotransmitters or modulators (putative) - catecholamine levels in sympathetic nerves
REFERENCE :
APTOA6 Acta Pharmacologica et Toxicologica. (Copenhagen, Denmark) V.1-59, 1945-86. For publisher information, see PHTOEH Volume(issue)/page/year: 39,513,1976 ** REPRODUCTIVE DATA **
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
DOSE :
100 mg/kg
SEX/DURATION :
female 9 day(s) after conception
TOXIC EFFECTS :
Reproductive - Specific Developmental Abnormalities - eye/ear Reproductive - Specific Developmental Abnormalities - urogenital system
REFERENCE :
RCOCB8 Research Communications in Chemical Pathology and Pharmacology. (PJD Pub. Ltd., P.O. Box 966, Westbury, NY 11590) V.1- 1970- Volume(issue)/page/year: 26,65,1979
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
DOSE :
100 mg/kg
SEX/DURATION :
female 6 day(s) after conception
TOXIC EFFECTS :
Reproductive - Fertility - post-implantation mortality (e.g. dead and/or resorbed implants per total number of implants)
REFERENCE :
RCOCB8 Research Communications in Chemical Pathology and Pharmacology. (PJD Pub. Ltd., P.O. Box 966, Westbury, NY 11590) V.1- 1970- Volume(issue)/page/year: 26,65,1979
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Intraperitoneal
DOSE :
24 mg/kg
SEX/DURATION :
female 8-14 day(s) after conception
TOXIC EFFECTS :
Reproductive - Effects on Embryo or Fetus - fetotoxicity (except death, e.g., stunted fetus) Reproductive - Effects on Embryo or Fetus - fetal death
REFERENCE :
TJADAB Teratology, The International Journal of Abnormal Development. (Alan R. Liss, Inc., 41 E. 11th St., New York, NY 10003) V.1- 1968- Volume(issue)/page/year: 25(2),43A,1982 *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - X5484 No. of Facilities: 25 (estimated) No. of Industries: 1 No. of Occupations: 3 No. of Employees: 457 (estimated)

 Safety Information

Symbol GHS07
GHS07
Signal Word Warning
Hazard Statements H302-H315-H319-H335
Precautionary Statements P261-P305 + P351 + P338
Personal Protective Equipment dust mask type N95 (US);Eyeshields;Gloves
Hazard Codes Xn:Harmful
Risk Phrases R22;R36/37/38
Safety Phrases S26-S36/37-S61-S37/39
RIDADR 2811
WGK Germany 1
RTECS UQ4900000
Packaging Group III
Hazard Class 6.1(b)
HS Code 2933199090

 Synthetic Route

 Customs

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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 Synonyms

1H-Pyrazole
1,2-DIAZOL
2-PyrroMonazole
diazole
[3,2-c]pyrazole
Pyrrazole
bisazole
1H-Pyrazol
Pyrazole
PYRAZOLE,PURE
1,2-diazole
EINECS 206-017-1
pyrazol
MFCD00005234
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