Quinolinium fluorochromate

Steric effects dominate in the oxidation of dialkyl, alkyl phenyl and benzal methyl phenyl sulfides to their sulfoxides by quinolinium fluorochromate (QFC) in aqueous acetic acid. QFC oxidation of phenoxyacetic acids has been smdied. Imidazolium dichromate oxidations of a-hydroxy acids have been smdied. ... 

The kinetics of oxidation of allyl alcohol with quinolinium fluorochromate have been studied.11 This reagent has also been used to oxidize benzyl alcohols the activation enthalpies and entropies obtained for the substituted derivatives are linearly related, and a Hammett relationship (p = —1.04 0.08) is obeyed.12... 

Oxidation of several primary aliphatic alcohols with potassium dichromate, pyri-dinium dichromate, quinolinium dichromate (QDC), imidazolium dichromate, nico-tinium dichromate, isonicotinium dichromate, pyridinium fluorochromate (PFC), quinolinium fluorochromate, imidazolium fluorochromate, pyridinium chlorochromate (PCC), quinolinium chlorochromate (QCC), and pyridinium bromochromate (PBC), in aqueous acetic acid and in the presence of perchloric acid, showed similar kinetics. The values of the reaction constants did not differ significantly, indicating operation of a common mechanism.1... 

Oxidations by imidazolium fluorochromate (IFC), pyridinium fluorochromate (PFC), quinolinium fluorochromate (QFC), quinaldinium fluorochroma (QnFC), and tripropy-lammonium fluorochromate (TPAFC) are also reported. 

Dimethylpyrazolinium fluorochromate,403 isoquinolinium fluorochromate (iQFC)404 and quinolinium bromochromate (QBC)405 have also been described as halochromates able to oxidize alcohols. 

Abbreviations used PCC = pyridinium chlorochromate, MCC = 1-methyl imidazolium chlorochromate, ICC == imidazolium chlorochromate, PFC = pyridinium fluorochromate, QDC = quinolinium chlorochromate. 

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