Fluoroketenes VII. Synthesis and reactivity of trifluoromethylfluoroketene, perfluoroacryloyl fluoride, perfluoromethacryloyl fluoride, methyl perfluoroacrylate and methyl perfluoromethacrylate

Fluorine Compounds, Organic

“…Higher perfluoroolefins can also be employed [216]. The methyl ethers are valuable intermediates, which can be converted to acid fluorides with sulfur trioxide [217] or other Lewis acids [218]. Primary and secondary perfluorinated alkoxides (see Chap.…”

Trimethylsilyl fluorosulfonyldifluoroacetate (TFDA): a new, highly efficient difluorocarbene reagent

“…Examples of additions of difluorocarbene to substrates as electron deficient as a,b-unsaturated carbonyl compounds are few and far between [24,25]. Therefore, studies were carried out in order to obtain comparative reactivity data for this new difluorocarbene reagent.…”

Synthesis and chemistry of α-iodoperfluoroacid esters

“…19 F NMR spectra were recorded at 282.2 and 470.3 MHz, using an internal standard of trichlorofluoromethane. In spectra of certain complex spin systems, line spacings reported as Js may not be true coupling constants.…”

“…Despite many attempts, 14 has never been isolated, and has only been trapped as derivatives 15 and 16 (Scheme 3) [18,19].…”

“…After 48 h of irradiation, ethyl perfluoro-2-iodobutyrate (2) was present in 77% yield, as measured by 19 F NMR with trifluorotoluene as internal standard. Solvent was removed by distillation, and then tetrabutylammonium salts were removed by flash chromatography (100 g silica gel, 300 mL ether).…”