4-tert-Butylbenzoic acid

  • p-tert-Butylbenzoic acid
  • p-tert-Butylphenylcarboxylic acid
  • 4-(1,1-Dimethylethyl)benzoic acid
  • PTBBA
Formula
4-[(CH3)3C]C6H4COOH
Structure
Description
White or colorless crystalline powder, beige chips and powder.
Uses
Modifier for alkylated resins; polymerization regulator for polyesters; additive in cutting oils; corrosion inhibitor

Registry Numbers and Inventories.
CAS
98-73-7
EC (EINECS/ELINCS)
202-696-3
EC Class
harmful
R 20/21/22
S 22 36/37
RTECS
DG4708000
RTECS class
Reproductive Effector; Primary Irritant
Beilstein/Gmelin
607545
Beilstein Reference
4-09-00-01884
Swiss Giftliste 1
G-3278
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C11H14O2
Formula mass
178.23
Boiling point, °C
283
Vapor pressure, mmHg
0.0015 (25 C)
Saturation Concentration
Less than 100 ppm (calculated)
Evaporization number
Negligible at 20 C
Density
1.045 g/cm3 (30 C)
Solubility in water
0.3 g/L
pKa/pKb
4.40 (pKa)
Partition coefficient, pKow
3.58
Heat of fusion
17.9 kJ/mol
Heat of vaporization
55.2 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
D1B D2A D2B
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Avoid contact with eyes, skin, and clothing. Do not breathe dust, vapor, mist, or gas. Keep container tightly closed. Do not ingest or inhale. Use only in a chemical fume hood.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong bases.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
135
Autoignition, °C
> 510
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. This material in sufficient quantity and reduced particle size is capable of creating a dust explosion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
May cause liver and kidney damage. May cause reproductive effects.
   Ingestion
Harmful if swallowed. May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated. May produce nervous system disturbances.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated. Harmful if inhaled.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   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. 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.

Transport.
4. Organic acids
HS Code
2916 39 00