20174-11-2

Upstream product

• 689-99-6 difluoroacetylene 
• 19721-29-0 1,2,3,3-tetrafluorocyclopropene 
• 77547-36-5 3,4-Difluoro-3-cyclobutene-1,2-dione 
• 461-68-7 1,1,3,3-tetrafluoro-1,2-propadiene 
• 857899-86-6 (1-hydrohexafluoroisobutenyloxy)trimethylsilane 

Downstream Products

• 7309-82-2 perfluoropyruvic acid fluoride 
• 85738-66-5 5-fluoro-3,3-diphenyl-4-trifluoromethyl-3H-pyrazole 

Relevant academic research and scientific papers

Thermal and BF3·Et2O-catalyzed cleavage of 1-hydrohexafluoroisobutenyloxytrimethylsilane. Perfluoromethacrolein, its isomers, dimers, and homopolymers

During vacuum pyrolysis in a quartz or steel tube, 1- hydrohexafluoroisobutenyloxy- trimethylsilane (1) eliminates fluorotrimethylsilane to give perfluoromethacrolein, which was detected by NMR. Similar pyrolysis of silane 1 over KF results in E- and Z-β-hydro- tetrafluoromethacryloyl fluorides. At 20°C, perfluoromethacrolein undergoes homo- polymerisation and/or cyclodimerization to yield 4,4-difluoro-2- pentafluoroisopropenyl-5- trifluoromethyl-4H-1,3-dioxin, which rearranges into E-7,7,7-trifluoro-2,6-bis(trifluoro- methyl)-4-oxahepta-2,5-dienoyl fluoride under the action of BF3·Et2O. The same fluoride is also formed, together with fluorotrimethylsilane, directly from silane 1 under the action of BF3·Et2O.

The vibrational spectrum of tetrafluoropropyne

The i.r. spectrum of gaseous tetrafluoropropyne has been measured from 4000 to 100 cm -1, and all of the observed bands have been assigned.The e mode frequencies of the CF3 group are similar to those of other CF3CCX species, and even though the a1 modes are less regular, the variations can be explained without changes in force constants other than those involving the C-X bond.Several bands, particularly ν1 and combinations with ν1, show pronounced sequence structure due to excited levels of ν10, the C-C-C skeletal bend.

Infrared Multiphoton-Induced Isomerization of Tetrafluorocyclopropene

Infrared multiphoton excitation of tetrafluorocyclopropene (TFCP) leads to the unexpected formation of tetrafluoroallene (TFA) and tetrafluoropropyne (TFP).The ratio of TFP to TFA formed in the reaction is independent of fluence and pressure, and no other products are formed.The conversion per pulse increases as the pressure of TFCP increases but decreases as the pressure of a buffer gas or the products increases.The apparent intramolecular 1,2-fluorine migration required to form the products is discussed in terms of both unimolecular and bimolecular processes.

Preparation method of Z-1, 3, 3, 3-tetrafluoropropene

The invention discloses a preparation method of Z-1, 3, 3, 3-tetrafluoropropene, which comprises the following steps: by taking 1, 3, 3, 3-tetrafluoropropyne or/and an isomer 1, 1, 3, 3-tetrafluoropropadiene thereof as a raw material, carrying out gas-phase selective hydrogenation in the presence of a hydrogenation catalyst to obtain the Z-1, 3, 3, 3-tetrafluoropropene. The method provided by the invention is mainly used for producing Z-1, 3, 3, 3-tetrafluoropropene in a high-efficiency and gas-phase continuous circulation manner.

GASEOUS DIELECTRICS WITH LOW GLOBAL WARMING POTENTIALS

A dielectric gaseous compound which exhibits the following properties: a boiling point in the range between about ?20° C. to about ?273° C.; non-ozone depleting; a GWP less than about 22,200; chemical stability, as measured by a negative standard enthalpy of formation (dHf0); a toxicity level such that when the dielectric gas leaks, the effective diluted concentration does not exceed its PEL; and a dielectric strength greater than air.

Squaric acid difluoride

Hitherto unknown squaric acid difluoride (3,4-difluoro-3-cyclobutene-1,2-dione) (1a) has been synthesized in 71% yield by gas phase fluorination of squaric acid dichloride (1c) with KF at 250°C. (1a) has been characterized by multinuclear NMR, mass, IR and Raman spectra. The IR spectrum is in excellent agreement with its ab initio prediction (MP2, 6-311 + G(2d, p)). The vacuum thermolysis of (1a) at 700°C does not yield the expected decarbonylation product FCCF (2a) although the precursor of the latter, F2CCCO, and three C3F4 isomers (propyne, allene, cyclopropene) which are also found as decomposition products of (2a) have been identified.

Isolation, Characterization and Some Properties of Free Difluoroethyne, FCCF

Difluoroethyne, FCCF 1, has been prepared by vacuum pyrolysis of perfluoro-1,2,3-triazine, isolated in pure form and characterized by 19F NMR and gas phase IR spectroscopy; its decomposition, with a half-life-time at 300 K and ca. 2.5 mbar of ca. 15 min, yields in the first step a polymer and :CF2, the latter either oligomerizing or reacting with 1 to form three different C3F4 isomers.