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SF5 group

In recent years, the SF5 group has emerged as a new, potentially interesting substituent with respect to its possible influence on biological... [Pg.231]

It has been shown that the SF5 group has a similar but often enhanced effect on the lipophilicity of compounds, and on essentially any physical or chemical property that derives from its strong polar influence. It also has the advantage of greater hydrolytic stability than a trifluoromethyl group. [Pg.232]

To a significant extent, the interest in compounds bearing an SF5 group is a direct result of the increased availability of SF5-containing building blocks, as well as by the appearance in the literature of new and convenient methods for incorporating SF5 into aliphatic and aromatic compounds. [Pg.232]

FIGURE 7.2. Typical 19F NMR signals for an SF5 group, in this case for (pentafluo-rosulfanylmethylene)cyclohexane... [Pg.233]

The influences of SF5 groups upon H and 13C NMR spectra are also quite characteristic, and information about proton and carbon chemical shifts and the respective coupling constants will be included along with the 19F data where they are available. The proton and carbon NMR spectra for (pentafluorosulfanylmethylene)cyclohexane are provided in Figs. 7.3 and 7.4 as typical examples. [Pg.233]

Whether the SF5 group is aliphatic-, vinylic-, or aromatic bound does not seem to have much influence upon the fluorine chemical shifts observed. However, an SF5 group that is proximate to a functional group can have its chemical shifts, particularly those of the equatorial fluorines, influenced somewhat by that functional group. [Pg.234]

As can be seen below, a retro-Diels-Alder strategy was used to prepare 2,3- and 2,4-disubstituted furans with a SF5 group as one of the substituents, which was introduced into furan ring for the first time <06OL5573>. [Pg.184]

In addition to these well-known fluorides, there are others that include a form of S2F2 that is actually thiothionyl fluoride, SSF2, SF2, and S2F10, in which two SF5 groups are linked by an S-S bond. [Pg.532]

Introduction of SF5 Croups into Nitro Compounds As a part of continuing research for energetic materials that combine high performance with low vulnerability toward accidental detonation, the effect of introduction of the pentafluorosulfonyl (SF5) group on the properties of explosive nitro compounds... [Pg.102]

As discussed earlier, nitro explosives with an SF5 group possess improved properties-increased density, greatly reduced impact sensitivity and good thermal stability with respect to similar explosives without SF5 groups. Some work commenced in this field in the USA in the late 1980s and early 1990s but subsequently, there have been no efforts in this direction. However, there is a lot of scope in this area and it needs further exploration. [Pg.147]

For comparative purposes and in order to enhance our understanding of trends in chemical shifts, typical examples of hypervalent selenium and tellurium fluorides are provided in Scheme 7.26. Unfortunately, it appears that neither the SeF5 nor the TeSF5 groups have the chemical stability that is exhibited by the SF5 group. [Pg.287]

In the proton spectrum, the vinylic hydrogen appears as a pentet at 8 6.14 with a three-bond F-H coupling constant of 9 Hz, which means that only the equatorial fluorines couple to the hydrogen. There appear to be no examples of the axial fluorine of an SF5 group exhibiting... [Pg.290]

In the above 13 C NMR spectrum, the vinylic carbon bearing the SF5 group appears as a pentet (2/FC = 17.0 Hz) at 8 132.34, with the other vinylic carbon also exhibiting coupling (3/FC = 5.0 Hz) and appearing at... [Pg.291]

A /5-chlorine on the alkene has little effect upon the chemical shift of the axial fluorine but acts to slightly deshield the equatorial fluorines of the SF5 group (Scheme 7.36). [Pg.295]


See other pages where SF5 group is mentioned: [Pg.11]    [Pg.232]    [Pg.232]    [Pg.234]    [Pg.234]    [Pg.235]    [Pg.236]    [Pg.238]    [Pg.239]    [Pg.100]    [Pg.103]    [Pg.110]    [Pg.148]    [Pg.289]    [Pg.289]    [Pg.289]    [Pg.289]    [Pg.290]    [Pg.291]    [Pg.292]    [Pg.292]    [Pg.292]    [Pg.293]    [Pg.294]    [Pg.295]    [Pg.296]    [Pg.297]    [Pg.298]    [Pg.299]    [Pg.299]   


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SF5 Groups into Nitro Compounds

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