Benzyl chloroformate

  • Benzyl chlorocarbonate
  • Carbobenzoxy chloride
Formula
C8H7ClO2
Structure
Description
A colorless liquid with an acrid odor.
Uses
In peptide synthesis to block the amino group.

Registry Numbers and Inventories.
CAS
501-53-1
EC (EINECS/ELINCS)
207-925-0
EC Index Number
607-064-00-4
EC Class
Corrosive; Dangerous for the Environment
R 34 50/53
S 26 45 60 61
RTECS
LQ5860000
RTECS class
Other
UN (DOT)
1739
Merck
13,1810
Beilstein/Gmelin
509751
Beilstein Reference
4-06-00-02278
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H7ClO2
Formula mass
170.60
Melting point, °C
-18
Boiling point, °C
103
Vapor pressure, mmHg
0.094 (25 C)
Density
1.22 g/cm3 (20 C)
Solubility in water
Insoluble.
Viscosity
2.57 MPa-s@ 20C
Surface tension
25 g/s2
Refractive index
1.5190 (20 C)
Partition coefficient, pKow
2.69
Heat of vaporization
46.1 kJ/mol
Heat of combustion
-5117 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a cool, dry place. Keep refrigerated.
Handling
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Avoid contact with heat, sparks and flame. Do not ingest or inhale.
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. Clean up spills immediately, using the appropriate protective equipment. Scoop up with a nonsparking tool, then place into a suitable container for disposal.
Stability
Substance is shock sensitive and thermally unstable. Decomposes when heated.
Incompatibilities
Acids. Can react with rust from corroded equipment. Iron salts catalyze explosive decomposition of ester. Reacts with water or steam.
Decomposition
Hydrogen chloride, chlorine, phosgene, carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
91
Autoignition, °C
590
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. Reacts violently with water. Extinguishing media: Do NOT use water directly on fire. Use foam, dry chemical, or carbon dioxide.
Fire potential
Combustible
Hazards
Substance will react with water (some violently), releasing corrosiveand/or toxic gases.
Combustion products
Toxic phosgene, hydrogen chloride, and benzyl chloride vapors may form.
Health
3
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
3 (Strong toxins)
Exposure effects
Agitation and syncope, both attributed to panic, have been reported.
   Ingestion
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns.
   Inhalation
May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin
May cause severe irritation and possible burns.
   Eyes
Contact with eyes may cause severe irritation, and possible eye burns. Lachrymator.

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

Transport.
UN number
1739
Response guide
Hazard class
8
Packing Group
I
 
USCG CHRIS Code
BCF
 
HS Code
2915 90 20
 
Std. Transport #
4933010