Methane, Tetrafluoro

SYNS ARCTON 0 CARBON FLUORIDE F 14 FC 14 FREON 14 HALOCARBON 14 HALON 14 METHANE, TETRAFLUORO- PERFLUOROMETHANE... 

Information is given on Freons 11, 12, 13, 21, 22. 113, 114 trichlorofluoro-, dichlorodifluoro-, chlorotrifluoro-, dichlorofluoro- and chlorodifluoro-methane 1,1, 2-trichloro-l,2,2-trifluoro-, and 1,2-dichloro-tetrafluoro-ethane, respectively. 

Borate(l-), tetrafluoro-, hydrogen, compound with oxybis[methane], 67,141 Boric acid, 69, 169... 

Reaction of recently synthesized 1 -al kvnyl />-( trifluoromethyl )phenyl]( tetrafluoro-borato)-X3-bromanes with 2-mercapto- benzimidazole or benzothiazole in dichloro-methane at 0°C under argon resulted in a domino Michael addition-carbene rearrangement-cyclization reaction to produce directly tricyclic heterocycles in high yields (Scheme 67).103... 

When 1,2,3-trihydroxypropane or tetrakis[hydroxymethyl]methane were reacted with an excess of tellurium hexafluoride, alkoxy tellurium fluorides were obtained with tetrafluoro-telluro and pentafluorotelluro groups in the molecule. ... 

Tetrakis[hydroxymethyl]methane and an excess of tellurium hexafluoride yielded tet-rakis[pentafluorutelluriumoxymethyl methane as the major product and minor amounts of 5,5-bis- pentafluorotelluriumoxymethyl -2,2,2,2-tetrafluoro-l, 3,2-dioxatellurinane2. 

The reagents for iodine fluoride addition to unsaturated centers are iodine229 or A -iodosuc-cinimide (NIS),221 258 and iodine pentafluoride, hydrogen fluoride,221,258 potassium fluoride, silver(I) fluoride229 278 or ammonium hydrogen difluoride/aluminum trifluoride220 as fluoride ion sources. In addition to the in situ iodofluorinations with iodine monofluoride,l96,22< 227 and (difluoroiodo)methane,194,19 iodofluorination with bis(pyridine)iodonium tetrafluoro-borate219 is described. 

Oicobalt octacarbonyl Cobalt, octacarbonyldi-, (Co-Co) (8,9) (15226-74-1) Tetrafluoroboric acid-dimethyl etherate Borate(l-), tetrafluoro-, hydrogen, compd. with oxybis[methane] (1 1) (10) (67969-83-9)... 

The oxidation of methane can be stimulated by addition of tetrafluoro-hydrazine [33a]. The reaction proceeds via a chain radical mechanism ... 

The application of PFG NMR to chemical reactions in zeolite catalysts is not necessarily confined to the observation of the reactant and product molecules. By monitoring the diffusivity of an inert molecule it is also possible directly to trace any changes in the transport properties of the catalyst during the reaction. As an example of this procedure, in [236] tetrafluoro-methane is used to follow the transport inhibition within ZSM-5 during ethene conversion. In these studies, an H-ZSM-5 zeolite was loaded with 4 CF4 and 12 ethene molecules per unit cell and kept at a temperature of 343 K. The representation of the results in Fig. 22 shows that the mobility of the probe species drops by a factor of 6 during the first 3 hours of reaction and then remains relatively constant. Obviously, ethene conversion leads to the formation of larger compounds, which more effectively reduce the mobility of the probe molecules than is the case with the ethene molecules. 

Table 12 Unit-cell parameters for tetrafluoro- and tetrachloro-methane...

Tubular blood-contacting polymeric materials were modified by plasma polymerization and evaluated in animals (baboons) with respect to th r c iadty to induce acute and chronic arterial thrombosis. Nine plasma polymers based on tetrafluoro-ethylene, hexafluoroethane, hexafluwoethane/H, and methane, when deposited on silicone rubber, consumed platetets at rates ranging from l.l-5.6x 10 platelets/on day. Since these values are close to the lower detection limit for this test system, tl plasma polymers were considered relatively nonthrombogenk. Thus, artificial blood tube made of polyesters, having the inner side coated with plasma-pcrfymerized tetra-fluoroethylene, is now commercially available. 

Tao et al. prepared fluorinated polyimide (3-86 in Table 3.4) [126], from multi-trifluoromethyl-substituted diamine, which had a dielectric constant as low as 2.49. The dielectric constants decreased gradually with an increase in fluorene loading. The dielectric constant value was not only much lower than non-fluorinated polyimides such as PMDA-ODA (3.16) [127], it was also lower than some of the fluorinated polyimides such as those derived from 3,3, 5,5 -tetrafluoro-4,4 -diaminodiphenylmethane (TFDAM) and dianhydrides (2.73-2.82) [128] and from a,a-fcA(4-amino-3,5-difluorophenyl)phenyl-methane (4FMA) and dianhydrides (2.60-2.83) [129]. Wang et al. [130] prepared fluorinated poly-iinides (3-87 in Table 3.4) by incorporating diisopropyl-substituted fluorene moieties, which led to an improvement in solubility and dielectric properties. The dielectric constant obtained with the... 

An interesting difference in properties is observed between methyl fluoride and methylene difluoride, trifluoromethane, and tetrafluoro-methane. It is found that successive steps in chlorination of methane are accompanied by nearly the same enthalpy change (see Exercise 6-37), to within 4 kJ mole". This constancy for reactions in which C—H is... 

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