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*[[pyridinium chlorochromate]] (PCC) is the pyridinium salt of [CrO<sub>3</sub>Cl]<sup>−</sup>.
These salts are less reactive, more easily handled, and more selective than Collins reagent in oxidations of alcohols. These reagents, as well as other, more exotic adducts of nitrogen heterocycles with chromium(VI), facilitate a number of oxidative transformations of organic compounds, including cyclization to form [[tetrahydrofuran]] derivatives and [[Babler oxidation|allylic transposition]] to afford enones from [[allyl]]ic alcohols.
The above reagents represent improvements over the [[Jones reagent]], a solution of [[chromium trioxide]] in aqueous [[sulfuric acid]].
==Practical considerations==
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