Pyridinium chlorochromate is a reddish orange solid reagent used to oxidize primary alcohols to aldehydes and secondary alcohols to ketones. Pyridinium chlorochromate, or PCC, will not fully oxidize a primary alcohol to the carboxylic acid as does the Jones reagent. A disadvantage to using PCC is its toxicity. PCC was developed by Elias James Corey and William Suggs in 1975. PCC has the advantage of being less acidic. But this reagent is expensive enough so we have to use it wisely.
The original preparation by Corey involves adding one equivalent of pyridine to a solution of one equivalent of chromic acid and concentrated hydrochloric acid:
C5H5N + HCl + CrO3 → [C5H5NH][CrO3Cl]
Amorf of Pyridinium Chlorochromate
Mechanism Reaction of Oxidation with PCC
Further Reading . . .