Product Identification

Product Name

3,5-Dimethylpyrazole

Synonyms

,5-Dimethylpyrazole
1,2,3-Triazole
1H-3,5-Dimethylpyrazole
2H-1,2,3-Triazole
2H-Triazole
Osotriazole
Pyrrodiazole
TH 564
Triazacyclopentadiene
U 6245

CAS

288-36-8

CAS

67-51-6

Formula

C2H3N3

Formula

C5H8N2

Molecular Weight

69.06

Molecular Weight

96.13

EINECS

200-657-5

RTECS

UQ6477600

RTECS Class

Drug

Beilstein/Gmelin

104766

Beilstein/Gmelin

106325

Beilstein Reference

4-26-00-00029

Beilstein Reference

5-23-05-00110

Physical and Chemical Properties

Appearance

Solid.

Appearance

White powder.

Solubility in water

Soluble

Solubility in water

Very soluble

Melting Point

23-25

Boiling Point

208

Boiling Point

218

Vapor Pressure

0.2 (25 C)

Vapor Pressure

0.4 (25 C)

Density

0.8839 g/cm3 (16C)

Density

1.192 g/cm3

pKa/pKb

9.00 (pKa)

pKa/pKb

9.74 (pKb)

Partition Coefficient

.23

Partition Coefficient

1.24

Heat Of Vaporization

42.1 kJ/mol

Heat Of Vaporization

43.6 kJ/mol

Heat Of Combustion

-3130 kJ/mol

Usage

Building block for more complex chemical compounds, such as pharmaceutical drugs like tazobactam.

Refractive Index

1.4854 (25 C)

First Aid Measures

Ingestion

Get medical aid. Wash mouth out with water.

Ingestion

If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.

Inhalation

Causes respiratory tract irritation. May be harmful if inhaled.

Skin

Causes skin irritation. May be harmful if absorbed through the skin.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Eyes

Causes eye irritation.

Handling and Storage

Storage

Store in a cool, dry place. Store in a tightly closed container.

Storage

Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Handling

Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.

Handling

Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.

Hazards Identification

Ingestion

May cause gastrointestinal irritation with nausea, vomiting and diarrhea. The toxicological properties of this substance have not been fully investigated.

Ingestion

May cause irritation of the digestive tract. May be harmful if swallowed.

Inhalation

May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.

Skin

May cause skin irritation. The toxicological properties of this material have not been fully investigated.

Eyes

May cause eye irritation. The toxicological properties of this material have not been fully investigated.

EC Risk Phrase

R 22

EC Risk Phrase

R 22 36/37/38

EC Safety Phrase

S 26 36/37/39

EC Safety Phrase

S 36/37

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Personal Protection

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 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Fire Fighting Measures

Flash Point

107

Flash Point

91

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container.

Stability and Reactivity

Stability

No data.

Incompatibilities

Oxidizing agents.

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents, acids, acetic anhydride, acid chlorides, carbon dioxide.

Disposal Code

5

Decomposition

Nitrogen oxides, carbon monoxide, carbon dioxide.

Decomposition

Nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Transport Information

HS Code

2933 19 90