PCC is the abbreviation for pyridinium chlorochromate, a reagent used in organic chemistry reactions to oxidize alcohols to form aldehydes, ketones and carbonyls. Its molecular formula is C5H5NHClCrO3.
PCC is not used very often because it is difficult to work up and because chromium and some carbonyl compounds are toxic. Its main purpose is to facilitate chemical reactions that produce useful byproducts. For example, ketones are important and useful compounds in industry and biology. Aldehydes are found in formaldehyde, which is a preservative, as well as some essential oils, such as cinnamaldehyde. Many sugars are derivatives of aldehydes. Carbonyls are molecules that have a carbon atom double-bonded to an oxygen atom and play a part in several important chemical reactions.