63967-41-9Relevant articles and documents
Synthesis of perfluoroheptanal by ozonolysis of perfluoro-1-octene
Odinokov, V. N.,Akhmetova, V. R.,Savchenko, R. G.,Fatykhov, A. A.,Zapevalov, A. Ya.
, p. 1084 - 1085 (1994)
Perfluoro-1-octene was used as a model for developing a method for the preparative ozonolysis of perfluoro-1-alkenes to the corresponding perfluoro-nor-alkenals.Perfluoroheptanal was synthesized. - Key words: perfluoro-1-octene, ozonolysis; peroxides, reduction; Lindlar catalyst; perfluoroheptanal.
The gas phase tropospheric removal of fluoroaldehydes (CxF 2x+1CHO, x = 3, 4, 6)
Solignac,Mellouki,Le Bras,Yujing, Mu,Sidebottom
, p. 4200 - 4210 (2008/09/19)
The rate coefficient of the OH reaction with the perfluoroaldehydes C 3F7CHO and C4F9CHO have been determined in the temperature range 252-373 K using the pulsed laser photolysis-laser induced fluorescence (PLP-LIF) method: kC3F7CHO+OH = (2.0 ± 0.6) × 10-12 exp[-(369 ± 90)/T] and kC4F9CHO+OH = (2.0 ± 0.5) × 10-12 exp[-(356 ± 70)/T] cm3 molecule-1 s-1, corresponding to (5.8 ± 0.6) × 10-13 and (6.1 ± 0.5) × 10-13 cm3 molecule-1 s -1, respectively, at 298 K. The UV absorption cross sections of these two aldehydes and CF3(CF2)5CH2CHO have been measured over the range 230-390 nm at 298 K and also at 328 K for CF3(CF2)5CH2CHO. The obtained results for C3F7CHO and C4F9CHO are in good agreement with two recent determinations but the maximum value of the absorption cross section for CF3(CF2)5CH 2CHO is over a factor of two lower than the single one recently published. The photolysis rates of C3F7CHO, C 4F9CHO and CF3(CF2)5CHO have been measured under sunlight conditions in the EUPHORE simulation chamber in Valencia (Spain) at the beginning of June. The photolysis rates were, respectively, Jobs = (1.3 ± 0.6) × 10-5, (1.9 ± 0.8) × 10-5 and (0.6 ± 0.3) × 10 -5 s-1. From the Jobs measurements and calculated photolysis rate Jcalc, assuming a quantum yield of unity across the atmospheric range of absorption of the aldehydes, quantum yields Jobs/Jcalc = (0.023 ± 0.012), (0.029 ± 0.015) and (0.046 ± 0.028) were derived for the photodissociation of C3F7CHO, C4F9CHO and CF 3(CF2)5CHO, respectively. The atmospheric implication of the data obtained in this work is discussed. The main conclusion is that the major atmospheric removal pathway for fluoroaldehydes will be photolysis, which under low NOx conditions, may be a source of fluorinated carboxylic acids in the troposphere. the Owner Societies.
Organofluorine compounds and fluorinating agents part 17: Sonochemical-forced preparation of perfluoroalkanals and their use for non-conventional acetalations of carbohydrates 1, 2
Miller, Alexey O.,Peters, Dietmar,Zur, Cornelia,Frank, Michael,Miethchen, Ralf
, p. 33 - 38 (2007/10/03)
The homologous 1-iodo-perfluoroalkanes 1a-1c and α,ω-dibromo-perfluoroalkanes 4a, 4b were carbonylated with DMF in the presence of Al/SnCl2 or Al/PbBr2 under sonication in a short reaction time. The hydrated aldehydes 2a-2c and 5a, 5b respectively were obtained in good yields allowing dehydration to 3a-3c and 6a, 6b. Some of the fluorinated aldehydes were selected as substrates in a Wittig-Horner olefination assisted by ultrasound and in non-conventional acetalations of methyl α-L-rhamnopyranoside (9). Thus, (E)-1-perfluorooctyl-2-phenylsulphonyl-ethene (8) was prepared from 3c and the phosphonate 7 by Wittig-Horner synthesis. Acetalations of 9 were carried out with the aldehydes (3a, 3b, 6a), hydrated aldehydes (2a, 2b), and the aldehyde hemiacetal 12 respectively, in the presence of dicyclohexylcarbodiimide (DCC). In all cases, a selective epimerization was observed at the C-atom 3 of the monosaccharide, i.e. polyfluoroalkylidenated 6-deoxy-α-L-altropyranosides 10, 11, 13, and 14 were obtained.
Reactivity of perfluorohexyl iodide with N,N-disubstituted amides and esters in the presence of a metal couple and radical initiator
Benefice-Malouet, S.,Commeyras, A.
, p. 103 - 108 (2007/10/02)
The reactivity of perfluorohexyl iodide with N,N-disubstituted amides or ethyl formate as solvents and reactants, in the presence of a zinc-copper metal couple and radical initiator, has been investigated.In each case, the corresponding perfluorinated carbonyl compounds, such as aldehydes, amides, ketones and esters, were obtained in good yield, thus proving the efficacy of this reaction.The influence of the radical initiator on the reaction mechanisms has been studied and is discussed. - Keywords: Reactivity; Perfluorohexyl iodide; Disubstituted amines; Zinc-copper metal couple; Radical initiator; NMR spectroscopy; IR spectroscopy; Mass spectrometry
