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Answer» HLW #⃣#⃣➕➕
PCC oxidizes alcohols one rung up the OXIDATION ladder, from primary alcohols to aldehydes and from secondary alcohols to ketones. Unlike chromic acid, PCC will not oxidize aldehydes to carboxylic ACIDS. Similar to or the same as: CrO3CrO3and pyridine (the Collins reagent) will also oxidize primary alcohols to aldehydes. Here are two examples of PCC in action.
If you add one equivalent of PCC to either of these alcohols, you OBTAIN the oxidized version. The byproducts (featured in grey) are CR(IV) as well as pyridinium hydrochloride.
One has to be CAREFUL with the amount of water present in the reaction. If water were present, it can ad to the aldehyde to make the hydrate, which could be further oxidized by a second equivalent of PCC were it present. This is not a concern with ketones, since there is no H directly bonded to C.
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