“…Packing forces appear to affect also fluorinated aliphatic compounds considerably. Whereas perfluorination increases the melting point of cyclohexane by 44 °C, it lowers that of tetrahydropyran by 14 °C and that of 1,4-dioxane by more than 50 °C. , …”
Section: 1 Boiling and Melting Ranges Of Polyfluoro
Ethersmentioning
“…Packing forces appear to affect also fluorinated aliphatic compounds considerably. Whereas perfluorination increases the melting point of cyclohexane by 44 °C, it lowers that of tetrahydropyran by 14 °C and that of 1,4-dioxane by more than 50 °C. , …”
Section: 1 Boiling and Melting Ranges Of Polyfluoro
Ethersmentioning
“…This observation also suggests that the sodium fluoride particles also function as a source of fluoride ion which displaces a chloride ion nucleophilically. This result is supported by the inability of the relatively fluoride-ion-free LTG process to fluorinate acid chlorides without substantial decomposition, while acid fluorides fluorinate uneventfully (Adcock and Lagow, 1974; Adcock et al, 1975).…”
Section: Chemical Considerations and Observationsmentioning
Rates of oxidation and gum formation for six hydrocarbons, three jet turbine fuels and three diesel fuels have been measured at 100 °C in the presence of f-Bu202 as initiator. Four of the six fuels oxidize faster at 100 °C than in previous work at 130 °C without initiator. For any single substrate, the amount of gum produced for the oxygen absorbed is similar at 100 and 130 °C, even with large changes in rates and f-Bu202 concentrations. Thus, one mechanism of gum formation is intimately associated with oxidation. The effects of f-Bu202 concentration on the rates of oxygen absorption and gum formation show that gum formation is associated with chain termination by two peroxy radicals. In general, the pure hydrocarbons have long kinetic chains and give good yields of hydroperoxides. The fuels give short kinetic chains and produce little hydroperoxide but much gum for the oxygen absorbed. Another mechanism of gum formation is the coupling of substrates by peroxides in the absence of oxygen. The mechanism, condensation of oxidation products from alkylnaphthalenes, is also proposed.
“…Among them hydrofluoroethers (HFEs) became the subject of several studies [1][2][3]. They can be synthesized by different methods [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”
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