Fluorocarbon reduction

Bismuth pentafluoride is an active fluorinating agent. It reacts explosively with water to form ozone, oxygen difluoride, and a voluminous chocolate-brown precipitate, possibly a hydrated bismuth(V) oxyfluoride. A similar brown precipitate is observed when the white soHd compound bismuth oxytrifluoride [66172-91 -6] BiOF, is hydrolyzed. Upon standing, the chocolate-brown precipitate slowly undergoes reduction to yield a white bismuth(Ill) compound. At room temperature BiF reacts vigorously with iodine or sulfur above 50°C it converts paraffin oil to fluorocarbons at 150°C it fluorinates uranium tetrafluoride to uranium pentafluoride and at 180°C it converts Br2 to bromine trifluoride, BrF, and bromine pentafluoride, BrF, and chlorine to chlorine fluoride, GIF. It apparently does not react with dry oxygen. 

Another point of contention has been the extent to which, if any, SbFj is reduced to SbFs upon intercalation. Although chemical analyses have shown an F Sb ratio of 5 1 (Lll, M5), Sb Mossbauer measurements (B24) indicated partial reduction of Sb(V) to Sb(III). On the other hand, mass-spectral measurements as a function of temperature (S15) showed only SbFs, evolved in stages, with no fluorocarbons emitted at any time. The latter are usually an indication of partial reduction of the intercalant and fluorination of the graphite host. Wide-line, F-NMR chemical-shifts are consistent with either SbFj or SbFe, but not with SbFs, but the occurrence of fluorine exchange could produce minor amounts of trivalent species (FI 1) this point is thus still controversial, and will be alluded to again. 

It was hoped that reductive elimination of the fluorocarbon ligand from compounds 96 might afford the elusive valence isomer of OFCOT, perfluo-rosemibullvalene 98. AH attempts to induce formation of 98 from these Pt(II)... 

N-nitroso-N-trifluoromethyl trifluoromethanesulfonamide [78], photolysis of bis-(trifluoromethyl)tellurium [79], thermal AIBN-induced decomposition of bis-(trifluoromethyl)mercury [80], thermolysis of highly branched perfluoro-carbons [81], and even thermolysis of persistent perfluoroalkyl radicals such as that discovered by Scherer [39, 45]. Recently it has even been found that per-fluorocarbons can be a source of perfluoroalkyl radicals when they undergo photoinduced reduction by NH3 or by Cp2TiF2 [82,83]. 

Recently a number of groups, most significantly those of Crabtree and Richmond, have devised methods of carrying out reductive defluorination/ functionalization processes of saturated fluorocarbons. It is assumed that these processes involve successive single electron transfer processes [82]. Richmond and... 

Cost reduction and higher efficiency Boosters and dendrimers for fluorocarbon finishes (FC)... 

I have two questions the story or the depletion of the ozone has been of great concern in the last years, and I missed in your paper the present judgment on this. You showed differences in ozone reduction from 16 or 18 to 6% or 8%. Does it have any meaning That would be the first question. The other question I have had many discussions with industrialists, politicians etc. and they use the example of ozone and of fluorocarbons as proof that warnings of scientists to do something or to stop the use of certain chemicals are meaningless, and not really justified. In your opinion, the warning of the National Academy of Science has it been justified ... 

---