Cyclobutane

  • Tetramethylene
Formula
C4H8
Structure
Description
Colorless gas.
Uses
Intermediate in organic synthesis.

Registry Numbers and Inventories.
CAS
287-23-0
EC (EINECS/ELINCS)
206-014-5
UN (DOT)
2601
Merck
12,2783
Beilstein/Gmelin
1900183
Beilstein Reference
4-05-00-00006
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
C4H8
Formula mass
56.11
Melting point, °C
-90.2
Boiling point, °C
12
Vapor pressure, mmHg
1180 (25 C)
Vapor density (air=1)
1.93
Density
0.703 g/cm3 (0 C)
Solubility in water
Insoluble
Refractive index
1.3752 (0 C)
Partition coefficient, pKow
2.26
Heat of fusion
1.10 kJ/mol
Heat of vaporization
24.2 kJ/mol
Heat of combustion
-2722 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
No data.
Incompatibilities
Incompatible with strong oxidizing agents like nitric acid.

Fire.
Flash Point,°C
-67
Autoignition, °C
427
Upper exp. limit, %
11.1
Lower exp. limit, %
1.8
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Use alcohol foam, dry chemical or carbon dioxide. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
EXTREMELY FLAMMABLE.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Containers may explode when heated. Ruptured cylinders may rocket.
Health
1
 
Flammability
4
 
 
Reactivity
0
 

Health.
Exposure effects
   Ingestion
Nausea, vomiting, and gastrointestinal hemorrhage may develop.
   Inhalation
Hyperventilation may develop.
   Skin
Dermal exposure may cause frostbite injury. Severe tissue burns have been reported.
   Eyes
May cause irritation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Administer 100% humidified supplemental oxygen with assisted ventilation as required. If hypoxia has been severe or prolonged, carefully evaluate for neurologic sequelae and provide supportive treatment as indicated.
   Skin
Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2601
Response guide
Hazard class
2.1
Std. Transport #
4905723