Development of direct fluorination technology for application to materials for lithium battery

Elemental fluorine in organic chemistry (1997–2006)

“…Perfluorination of methanesulfonyl fluoride, using a perfluorocarbon fluid as the reaction medium, gave good yields of trifluoromethanesulfonyl fluoride (Scheme 2) [23].…”

An entirely new methodology for synthesizing perfluorinated compounds: synthesis of perfluoroalkanesulfonyl fluorides from non-fluorinated compounds

“…From the above results, we concluded that the C-S bond cleavage occurred due to the radical formation at the a-position rather than the b-position, although it cannot explain the case of the direct fluorination of methanesulfonyl fluoride [17].…”

“…For example, octanesulfonyl fluoride was perfluorinated to give the corresponding perfluorooctanesulfonyl fluoride as well as by-product perfluorooctane arising from C-S bond cleavage, although yields are not described [15]. Kobayashi et al reported direct fluorination of methanesulfonyl fluoride [17], but also reported that direct fluorination of ethanesulfonyl fluoride led to C-S bond cleavage mainly and gave perfluoroethane and sulfonyl difluoride [16]. This suggests that the C-S bond cleavage may be the result of b-elimination of the intermediate radical species.…”

Electrolytic Characteristics of Fluoroethylene Carbonate for Electric Double-Layer Capacitors at High Concentrations of Electrolyte

“…Although FEC (fp 17.3°C) 9 is a solid below room temperature, the high molal depression of their freezing points makes it possible to prepare room-temperature electrolytic solutions. Figure 1(a) shows the temperature (ª) dependence of molar concentrations (c solvent (ª)) of FEC and PC in the electrolytic solutions.…”