20174-11-2

Basic information

• Product Name: Tetrafluoro-1-propyne
• Synonyms: 1,3,3,3-Tetrafluoro-1-propyne;Tetrafluoro-1-propyne
• CAS NO: 20174-11-2
• Molecular Formula: C₃F₄
• Molecular Weight: 112.03
• Mol File: 20174-11-2.mol
• Article Data: 7

Chemical Properties

• Boiling Point: -50.39°C (rough estimate)
• Appearance: /
• CAS DataBase Reference: Tetrafluoro-1-propyne(CAS DataBase Reference)
• NIST Chemistry Reference: Tetrafluoro-1-propyne(20174-11-2)
• EPA Substance Registry System: Tetrafluoro-1-propyne(20174-11-2)

Safety Data

• Hazardous Substances Data: 20174-11-2(Hazardous Substances Data)

Upstream product

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

Downstream Products

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

Relevant articles and documents

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.

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.

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.