Chemistry informtion about 2,5-Dimethylphenylacetic Acid (CAS NO.6331-04-0) is:
IUPAC Name: 2-(2,4-Dimethylphenyl)Acetic Acid
Synonyms: Asischem D13366 ; (2,4-Xylyl)Acetic Acid ; Rarechem Al Bo 0306 ; Acetic Acid, (2,4-Xylyl)- ; 2,4-Dimethylphenylaceticacid97%
MF: C₁₀H₁₂O₂
MW: 164.2
EINECS: 237-097-6
Melting Point: 128-132 °C 
Density: 1.098 g/cm³
Flash Point: 192.2 °C
Boiling Point: 295.1 °C at 760 mmHg 
Enthalpy of Vaporization: 56.47 kJ/mol
Vapour Pressure: 0.000707 mmHg at 25°C
Following is the molecular structure of 2,5-Dimethylphenylacetic Acid (CAS NO.6331-04-0) is:

Safty information about 2,5-Dimethylphenylacetic Acid (CAS NO.6331-04-0) :
Hazard Codes:
Xi: Irritant
Risk Statements:
R36/37/38:Irritating to eyes, respiratory system and skin. 
Safety Statements:
S37/39:Wear suitable gloves and eye/face protection.  
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

 2,5-Dimethylphenylacetic Acid can surprisingly be obtained in high yield and purity by initially converting p-xylene with chloroacetyl chloride in a Friedel-Crafts reaction into 2-chloro-1-(2,5-dimethylphenyl)ethanone of the formula (I) , preparing from this ketone with a diol of the general formula (II) the corresponding ketal of the general formula (III), then rearranging the latter to a mixture of the corresponding hydroxyalkyl 2,5-dimethylphenylacetates of the general formula (IV) and bis(2,5-dimethylphenylacetic acid) diesters of the general formula (V) , and finally hydrolyzing the latter to give 2,5-Dimethylphenylacetic Acid .

General description about 2,5-Dimethylphenylacetic Acid (CAS NO.6331-04-0) :
First Aid Measures:
Eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
Skin: Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Ingestion: Get medical aid. Wash mouth out with water.
Inhalation: Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician: Treat symptomatically and supportively. 
Handling and Storage:
Handling: Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Storage: Store in a cool, dry place. Store in a tightly closed container.