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Tetraphenylphosphonium hydrogen difluoride

Thermally stable tetraphenylphosphonium hydrogen difluoride can act as a powerful in situ source of F" in various reactions with organic substrates as a nucleophile in... [Pg.160]

The reactivity of tetraphenylphosphonium hydrogen difluoride is comparable with more conventional chlonne-fluonne exchange reagents It can be used and regenerated as illustrated in equation 18 and its preparation is outlined in Procedure 3, p 193 The rate of reaction of tetraphenylphosphonium hydrogen difluonde with benzyl bromide using a fluoride concentration of 0 12 M in acetomtnle (f1/2=25 min at 52 °C) can be compared with that achieved by replacing it with potassium fluoride- 18-crown-6 (tm = 11 5 h at 82 °C) [28] The... [Pg.179]

See other pages where Tetraphenylphosphonium hydrogen difluoride is mentioned: [Pg.180]    [Pg.180]    [Pg.193]    [Pg.193]    [Pg.193]    [Pg.193]    [Pg.180]    [Pg.180]    [Pg.193]    [Pg.193]    [Pg.35]    [Pg.180]    [Pg.180]    [Pg.193]    [Pg.193]    [Pg.193]    [Pg.193]    [Pg.180]    [Pg.180]    [Pg.193]    [Pg.193]    [Pg.35]   


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Tetraphenylphosphonium

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