Replacement hydrogen fluonde

Lead tetrafluoride, generated in situ from lead dioxide and hydrogen fluonde, can replace benzylic hydrogen by fluonne [3] Under sirmlar conditions phenol is simultaneously oxidized to 4,4-difluoro-2,5-cyclohexadienone [4 (equations 3 and 4)... [Pg.120]

Anhydrous hydrogen fluonde, potassium fluonde, and sodium fluonde have all been used to promote the chlorine-fluonne exchangein tetmchloropyrukizine All three fliionne sources replace the chlonne in position 3 first Both sodium and potassium... [Pg.184]

Replacement of a vinylidene fluonde unit by an e ylene or propylene unit in a locally perfluonnated cham environment greatly reduces the acidity ot the methylene hydrogens Copolymers of TFE and propylene are therefore considerably more resistant to bases and polar solvents than VDF-based elastomers TFE and propylene form a highly altematmg structure... [Pg.1114]

One of the most useful ways of introducing fluorine into organic compounds is the replacement of the hydroxyl group in alcohols hydroxy compounds, and carboxylic acuis Methyl alcohol reacts with anhydrous hydrogen fluoride at 100 500 °C in the presence of aluminum fluoride [60, 61], zinc fluoride [62] chromium fluonde [63], or a mixture of aluminum and chromium fluorides [64] to give a 20-78% yield of fluoromethane Attempted fluonnations of higher alcohols by this method failed [60]... [Pg.215]

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