3828-49-7

Basic information

• Product Name: 2,3-Difluorotoluene
• Synonyms: Difluorotoluene 23-;2, 3 - two fluorine toluene;2,3-DIFLUOROTOLUENE;1,2-DIFLUORO-3-METHYL-BENZENE;Difluorotoluene1;2,3-difluoromethylbenzene;2,3-Difluorotoluene, 97+%;2,3-Difluorotoluene,96%
• CAS NO: 3828-49-7
• Molecular Formula: C₇H₆F₂
• Molecular Weight: 128.12
• EINECS: -0
• Product Categories: Fluorin-contained toluene series;Fluorobenzene;Halogen toluene;Miscellaneous;Aryl;C7;Halogenated Hydrocarbons
• Mol File: 3828-49-7.mol
• Article Data: 4

Chemical Properties

• Boiling Point: 119-121 °C(lit.)
• Flash Point: 15°C
• Appearance: colorless to light yellow liquid
• Density: 1.096 g/mL at 25 °C(lit.)
• Vapor Pressure: 15.4mmHg at 25°C
• Refractive Index: n20/D 1.4530(lit.)
• Storage Temp.: Room temperature.
• Solubility: 0.24g/l
• BRN: 3235341
• CAS DataBase Reference: 2,3-Difluorotoluene(CAS DataBase Reference)
• NIST Chemistry Reference: 2,3-Difluorotoluene(3828-49-7)
• EPA Substance Registry System: 2,3-Difluorotoluene(3828-49-7)

Safety Data

• Hazard Codes: Xn,F
• Statements: 10-22-37/38-41
• Safety Statements: 16-26-39
• RIDADR: UN 1993 3/PG 2
• WGK Germany: 2
• HazardClass: 3
• PackingGroup: II
• Hazardous Substances Data: 3828-49-7(Hazardous Substances Data)

Usage

Chemical Properties

colorless to light yellow liqui

InChI:InChI=1/C7H6F2/c1-5-3-2-4-6(8)7(5)9/h2-4H,1H3

Upstream product

• 504-60-9 penta-1,3-diene 
• 79-38-9 Chlorotrifluoroethylene 
• 460744-88-1 1-cyclopropyl-2,3,3-trifluorocyclobut-1-ene 

Downstream Products

• 2646-91-5 2,3-difluorobenzaldehyde 
• 446-57-1 1-(chloromethyl)-2,3-difluorobenzene 
• 1116681-99-2 2-(2,3-Difluoro-4-methylphenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane 
• 342902-40-3 7-fluoro-2-phenyl-1H-indole 
• 38573-88-5 1-bromo-2,3-difluorobenzene 
• 847502-83-4 3,4-difluoro-2-methylbenzonitrile 
• 2136287-65-3 3,4-difluoro-2-((phenylthio)methyl)benzoic acid 
• 2136287-66-4 7,8-difluoro-6,11-dihydrodibenzo[b,e]thiazepin-11-one 
• 1985607-83-7 7,8-difluoro-6,11-dihydrodibenzo[b,e]thiazepine-11-ol 
• 157652-31-8 3,4-difluoro-2-methyl benzoic acid 
• 1251164-88-1 3-fluoro-2-methyl-4-(methylsulfonyl)benzoyl chloride 
• 118287-06-2 3-fluoro-2-methyl-4-(thiomethyl)benzoic acid 
• 118939-18-7 3-fluoro-2-methyl-4-(methylsulfonyl)benzoic acid 

Relevant articles and documents

1,3-Dipolar cycloaddition of diazomethane and diazocyclopropane to 2-fluoro-3-methylbutadiene and thermal transformations of fluorine-containing vinylpyrazolines and vinylcyclopropanes

Reactions of 2-fluoro-3-methylbuta-1,3-diene with diazomethane in ether at 15°C and with diazocyclopropane generated in situ by decomposition of N-cyclopropyl-N-nitrosourea in the presence of K2CO3 in CH2Cl2 at -10°C selectively involve the double bond at the methyl group to give 3-(1-fluorovinyl)-3-methylpyrazolines. Thermal dediazotization of the latter at 250°C yields 1-(1-fluorovinyl)-1- methylcyclopropane and -spiropentane 5, which are capable of isomerizing, under more severe conditions (400 - 600°C), into 1-fluoro-2-methylcyclopent-1-ene and 5-fluoro-4-methylspiro[2.4]hept-4-ene (7), respectively. Spiropentane derivative 5 partially isomerizes into 1-fluoro-2-methyl-3-methylidenecyclohex- 1-ene. In a similar way, thermolysis of 6-(2,3,3-trifluorocyclobut-1-enyl)-4,5- diazaspiro[2.4]hept-4-ene at 400°C gives a mixture of 1-(spiropentyl)-2,3,3- trifluorocyclobut-1-ene and 2,3,3-trifluoro-1-(2-methylidenecyclobutyl)cyclobut- 1-ene. Thermolysis of 1-cyclopropyl-2,3,3-trifluorocyclobut-1-ene at 550 - 620°C affords a mixture of 1-(trifluorovinyl)cyclopentene and 2,3-difluorotoluene.

Method of preparing fluoroaromatic compounds

The present invention provides a method of preparing ortho-difluorobenzene derivatives, which comprises (a) providing a mixture of cyclohexenes by reacting chlorotrifluoroethylene (CTFE) and 1,3-diene in a flow reactor and distilling the resultant, and (b) dehydrohalogenating the mixture of cyclohexenes with a phase transition catalyst in the presence of alkali metal hydroxide at temperature range of 40 to 150 °C without using any organic solvent. The distillate having low boiling point, which is obtained during distillation of the resultant, is recycled into the flow reactor. The present invention also provides a method of preparing 2-chloro-4,5-difluorobenzoic acid, which comprises (a) providing a mixture of 4-chloro-1-methyl-4,5,5-trifluorocyclohexene and 5-chloro-1-methyl-4,4,5-trifluorocyclohexene by reacting chlorotrifluoroethylene (CTFE) and isoprene and distilling the resultant, (b) dehydrohalogenating said mixture in the presence of alkali metal hydroxide and a phase transition catalyst to form 3,4-difluorotoluene, (c) reacting said 3,4-difluorotoluene with chlorine gas without using any organic solvent to form 2-chloro-4,5-difluorotoluene, (d) photo-reacting said 2-chloro-4,5-difluorotoluene with chlorine gas under a lighting mercury lamp without using any organic solvent to form 2-chloro-4,5-difluorobenzotrichloride, and (e) reacting said 2-chloro-4,5-difluorobenzotrichloride with aqueous acid solution without using any organic solvent. The present invention also provides a method of preparing 2-chloro-4,5-difluorobenzoyl chloride by reacting the 2-chloro-4,5-difluorobenzotrichloride of step (e) above with zinc oxide.