2,5-Difluorotoluene

2,5-Difluorotoluene Property

Melting point:

-35°C

Boiling point:

117 °C775 mm Hg(lit.)

Density 

1.36 g/mL at 25 °C(lit.)

refractive index 

n20/D 1.452(lit.)

Flash point:

55 °F

storage temp. 

2-8°C

form 

liquid

color 

Clear, colourless

Specific Gravity

1.360

BRN 

2041492

Stability:

Stable. Incompatible with strong oxidizing agents.

CAS DataBase Reference

452-67-5(CAS DataBase Reference)

NIST Chemistry Reference

2,5-Difluorotoluene(452-67-5)

Safety

Hazard Codes 

F,F+

Risk Statements 

11

Safety Statements 

16-29-33

RIDADR 

UN 1993 3/PG 2

WGK Germany 

3

Hazard Note 

Flammable

HazardClass 

3

PackingGroup 

II

HS Code 

29039990

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H225Highly Flammable liquid and vapour

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P403+P235Store in a well-ventilated place. Keep cool.

P405Store locked up.

P501Dispose of contents/container to..…

2,5-Difluorotoluene Chemical Properties,Usage,Production

Chemical Properties

colorless to light yellow liqui

Uses

2,5-Difluorobenzaldehyde is a very important fine chemical. It is an intermediate for the synthesis of many important chemicals and is used as an intermediate for medicines, pesticides, and liquid crystal materials.

Synthesis

General procedure for the synthesis of p-fluorotoluene, 2-fluorotoluene, 3-fluorotoluene, 2,4-difluorotoluene, 2,5-difluorotoluene, and 1,2-difluoro-4-methylbenzene from toluene: To a glass reactor fitted with a PTFE-lined magnetic stirring bar connected to a gas scrubbing flask, add toluene (0.95-1.14 mmol), acetonitrile (1-2.5 mL/mmol toluene ) and boron trifluoride ethyl ether complex (1.3-1.6 mmol/mmol toluene). The reaction solution was stirred at -25 °C for 10-15 min, followed by the addition of xenon difluoride (1.2-1.3 mmol/mmol toluene) in batches. The reaction mixture was slowly warmed to 22 °C over 1 h and stirring was continued for 40-60 min. Upon completion of the reaction, hexafluorobenzene was added as an internal standard and samples were taken for 19F NMR analysis (Method B). The reaction mixture was quenched with saturated aqueous sodium bicarbonate and extracted with dichloromethane (1-2 mL). The organic phases were combined, dried with anhydrous magnesium sulfate and subsequently analyzed by 19F NMR and GC/MS (Procedure C). The major products are listed in the table and the remaining products are listed below (GC/MS data).

References

[1] Russian Journal of Organic Chemistry, 2016, vol. 52, # 10, p. 1400 - 1407
[2] Zh. Org. Khim., 2016, vol. 52, # 10, p. 1412 - 1419,8