74492-18-5

Upstream product

• 340-03-4 2-chloro-2,2-difluoro-1-phenyl-ethan-1-ol 
• 384-67-8 2-chloro-2,2-difluoroacetophenone 

Downstream Products

• 447-14-3 1,2,2-trifluorostyrene 
• 648-78-2 (1-Bromo-2-chloro-1,2,2-trifluoro-ethyl)-benzene 

Relevant academic research and scientific papers

A highly efficient room temperature non-organometallic route for the synthesis of α,β,β-trifluorostyrenes by dehydrohalogenation

Various 1-aryl-1,2,2,2-tetrafluoroethanes (ArCHFCF3, Ar=phenyl, substituted phenyl, naphthyl, heteroaryl) were synthesized by the fluorination of the corresponding alcohols with DAST. Dehydrofluorination of ArCHFCF3 using lithium hexamethyldisilazide (LHMDS) base in THF at room temperature produced 1,2,2-trifluorostyrenes (ArCF=CF2) in 61-91% isolated yields. This procedure provides an excellent non-organometallic alternative to the generally used metallation-Pd(0) coupling methods.

An efficient dehyrohalogenation method for the synthesis of α,β,β-trifluorostyrenes, α-chloro-β,β- difluorostyrenes and E-1-arylperfluoroalkenes

Dehydrofluorination of 1-aryl-1,2,2,2-tetrafluoroethanes (ArCHFCF 3) and 1-aryl-1-chloro-2,2,2-trifluoroethane (ArCHClCF3) using lithiumhexamethyldisilazide (LHMDS) in tetrahydrofuran (THF) at room temperature produced 1,2,2-trifluorostyrene and 1-chloro-2,2-difluorostyrene, respectively, in very good isolated yields. Dehydrofluorination of 1,2,2,3,3,3-hexafluoro-1-phenyl-propane (PhCHFCF2CF3) and 1,2,2,3,3,4,4,4-octafluoro-1-phenyl-butane (PhCHFCF2CF 2CF3) using LHMDS produced the corresponding substituted olefins (1-phenyl-1,2,3,3,3-pentafluoroprop-1-ene and 1-phenyl-1,2,3,3,4,4,4- pentafluorobut-1-ene) in good yield and high E-selectivity. Dehydrofluorination of 1-chloro-1-phenyl-2,2,3,3,3-pentafluoropropane (PhCHClCF2CF 3) and 1-chloro-1-phenyl-2,2,3,3,4,4,4-heptafluorobutane (PhCHClCF2CF2CF3) produced a mixture of the corresponding E and Z olefins (PhCClCFCF3 and PhCClCFCF 2CF3) in good yield.