2240-88-2Relevant articles and documents
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McBee,Truchan
, p. 2911 (1948)
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Photochemistry of CF3(CH2)2CHO in air: UV absorption cross sections between 230 and 340 nm and photolysis quantum yields at 308 nm
Anti?olo,Jiménez,Albaladejo
, p. 33 - 40 (2012)
This work constitutes the first study on the photochemical degradation process of CF3(CH2)2CHO. Firstly, the wavelength and temperature dependence of the UV absorption cross sections, σλ, was determined. The n → π* electronic transition band of CO chromophore was characterized between 230 and 340 nm in the 269-323 K range. A hyperchromic effect was observed in the structured part of the band when the temperature decreases. Maximum σ λ = 283, 291 nm at 323 K is ca. 22% larger than those at 269 K. Secondly, the pulsed laser photolysis of a stationary mixture of CF 3(CH2)2CHO/cyclohexane (OH-scavenger)/air or N2 was carried out at 308 nm. On-line Fourier transform infrared (FTIR) spectroscopy was employed to monitor the decay of CF3(CH 2)2CHO and to obtain the photolysis quantum yield, Φλ = 308 nm, as a function of total pressure (20.5-760 Torr). A slight curvature in the Stern-Volmer plot was observed at pressures lower than 75 Torr. At high pressures, the pressure dependence of Φλ = 308 nm can be described by a Stern-Volmer relationship. Photodissociation of CF3(CH2)2CHO at 308 nm can produce HCO and CF3(CH2)2 radicals (1a), CF3CH2CH3 and CO (1b) and CF3(CH2)2CO radicals and H atoms (1c). HCO radicals are rapidly converted into CO in the presence of O2. Formation of CF3CH2CHO and CF3CH 2CH2OH evidences the importance of secondary chemistry involving CF3(CH2)2 radicals formed in channel (1a). Further photodegradation of CF3CH2CHO yields mainly CF3CHO. Small quantities of HC(O)OH were also detected. CF 3(CH2)2C(O)OH was only observed in the absence of OH-scavenger, implying that formation of CF3(CH2) 2CO radicals in channel (1c) is not an important photolysis pathway. Consequently, photodissociation of CF3(CH2)2CHO in the actinic region is a source of shorter fluorinated oxygenated compounds, but it is not expected to be a source of fluorinated acids.
METHOD FOR PRODUCING 3,3,3-TRIFLUOROPROPANOL
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Paragraph 0051-0052, (2018/01/09)
PROBLEM TO BE SOLVED: To provide a method for producing 3,3,3-trifluoropropanol efficiently on an industrial scale. SOLUTION: 3,3,3-trifluoropropanol is produced by the reaction between benzyl vinyl ether represented by the following formula [where R is a phenyl group, or a phenyl group having a substituent represented by R1 (where R1 is an alkyl group, an alkoxy group, a halogen atom or a nitro group)] and hydrogen (H2) in the presence of a palladium catalyst. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPOandINPIT
Novel Nucleophilic Trifluoromethylation of Vicinal Diol Cyclic Sulfates
Takechi, Naoto,Ait-Mohand, Samia,Medebielle, Maurice,Dolbier Jr., William R.
, p. 4671 - 4672 (2007/10/03)
(Matrix Presented) A novel method for highly regioselective and stereospecific nucleophilic trifluoromethylation of vicinal diol cyclic sulfates, using the reagent derived from reduction of trifluoromethyl iodide by tetrakis(dimethylamino)ethylene (TDAE), is presented.
