Techniques Sarett_oxidation

the brick-red color of unreacted chromium trioxide (chromic anhydride).

the sarett reagent prepared in 1953 addition of chromic anhydride pyridine first, reagent grade pyridine must cooled 15–20 °c. then, small initial portion of chromic anhydride stirred pyridine. eventually, brick-red anhydride transform orange-yellow sarett reagent in exothermic reaction. @ point remaining anhydride may gradually stirred solution. must done mixture never rises above 30 °c. final product slurry of excess pyridine , precipitated sarett reagent, can take hour prepare (per 100 g yield). sarett oxidation carried out in mixture.