Phenyl-2-Propanone (Phenyacetone, P2P) can be made in a single step by a free-radical reaction between benzene and acetone [1,2]. The reaction relies upon the special oxidative powers of manganese(III)acetate, Mn(OAc)3. Normally when a compound is oxidized, two electrons are removed from the compound (forming a charged ion), but manganese(III)acetate is able to remove only one, creating a very reactive free radical, which reacts with almost anything nearby.
In this case, the manganese(III)acetate reacts with acetone to form an acetone radical, acetic acid and manganese(II)acetate:
The formed acetone radical immediately reacts with a benzene molecule, forming a non-aromatic intermediate radical, which with the aid of a second molecule of manganese(III)acetate is oxidatively deprotonated to form phenyl-2-propanone:
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