3,4-Dihydro-1H-isoquinoline

  • 1,2,3,4-Tetrahydroisoquinoline
  • 1,2,3,4-Tetrahydro-2-isoquinoline
  • 1,2,3,4-Tetrahydro-2-azanaphthalene
Formula
C9H11N
Structure
Description
Clear brown liquid. Unpleasant odor.

Registry Numbers and Inventories.
CAS
91-21-4
EC (EINECS/ELINCS)
202-050-0
EC Class
irritant
R 21/22 36/38
S 26 36/37
RTECS
NX4900000
RTECS class
Other
Beilstein/Gmelin
116156
Beilstein Reference
5-20-06-00320
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
C9H11N
Formula mass
133.19
Melting point, °C
-30
Boiling point, °C
232
Density
1.0642 g/cm3 (23 C)
Solubility in water
Very soluble
Refractive index
1.5742 (23.1 C)
pKa/pKb
4.34 (pKb)
Partition coefficient, pKow
1.71

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container.
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
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.
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.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents - strong acids.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
98
Autoignition, °C
380
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Will burn if involved in a fire. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Health.
Exposure effects
   Ingestion
The toxicological properties of this substance have not been fully investigated.
   Inhalation
Causes respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   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.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
HS Code
2933 49 90