1538-06-3Relevant academic research and scientific papers
Synthesis of α,ω-dimethoxyfluoropolyethers: Reaction mechanism and kinetics
Avataneo,De Patto,Galimberti,Marchionni
, p. 633 - 639 (2005)
A new class of hydrofluoropolyethers, the α,ω- dimethoxyfluoropolyethers (DM-FPEs), characterized by the copolymeric structure CH3O(CF2CF2O)n(CF2O) mCH3 has been recently developed. The synthesis of DM-FPEs here described, has been carried out via a new synthetic route which consists of the reaction of a perfluoropolyether diacyl fluoride with methyl fluoroformate in the presence of a metal fluoride. The reaction products are DM-FPEs and carbon dioxide. Several reaction conditions has been tested varying type of solvent, temperature, type and amount of metal fluoride. The best results were obtained using tetraglyme as solvent and CsF as metal fluoride.
Isolation and Characterization of Acetyl Hypofluorite
Appelman, Evan H.,Mendelsohn, Marshall H.,Kim, Hyunyong
, p. 6515 - 6518 (2007/10/02)
Acetyl hypofluorite, H3CC(O)OF, has been prepared by passage of diluted fluorine through solid KOAc*2HOAc and isolated by trapping at -78 deg C.It is a slightly yellow liquid (mp ca. -96 deg C) with a vapor pressure of about 4 torr at -40 deg C.Vapor-pressure measurements between -64 and -20 deg C led to an enthalpy of vaporization of 35.6 +/- 2.4 kJ/mol and an extrapolated normal boiling point of 53 +/- 6 deg C.At -78 deg C, in 1:1 (v/v) CCl4:CDCl3, its 19F NMR shift is 168.3 ppm vs.CFCl3.Its mass spectrum has been measured, as has its infrared spectrum in a solid argon matrix, and these support its identification.The vapor absorbs in the far ultraviolet, with an absorption maximum at 210 nm (ε ca. 103 L/mol*cm).The compound is of limited stability, particularly in the liquid phase, which sometimes explodes.The vapor is more stable, with a 2-h half-life at room temperature in Kel-F.The half-life is much shorter in Monel.Decomposition is inhibited by O2.Decomposition in a Kel-F container gives nearly quantitatively a 1:1 mixture of CH3F and CO2, but in a Monel apparatus or in the presence of O2, substantial amounts of H3COC(O)F are formed.
