text: <unk>  is the complex of chromium(VI) oxide with pyridine in dichloromethane. It is used to selectively oxidize primary alcohols to the aldehyde, and will tolerate many other functional groups within the molecule. It can be used as an alternative to the Jones<unk>  and pyridinium chlorochromate when oxidising secondary alcohols to ketones. Moreover, the<unk>  is especially useful for oxidations of acid sensitive compounds.
  This complex is both difficult and dangerous to prepare, as it is very hygroscopic and can inflame during preparation. It is typically used in a sixfold excess in order to complete the reaction.
option_0: Collins-Reagent
option_1: Colloid
option_2: Proteogenix
option_3: AT-10 resin
option_4: Immunotoxin
option_5: Hemocoel
option_6: Poractant Alfa
option_7: Ionic liquid