• Secondary alcohols are oxidized by a variety of reagents to give ketones (Section 17.8). The choice of oxidant depends on such factors as reaction scale , cost, and acid or base sensitivity of the alcohol.
• Ozonolysis of alkenes yields ketones if one of the unsaturated carbon atom is disubstituted (Section 17.8):
• Aryl ketones are prepared by Friedel-Crafts acylation of an aromatic ring with and acid chloride in the presence of AICI3 catalyst (Section 16.4):
• Methyl ketones are prepared by hydration of terminal alkynes in the presence of Hg2+ catalyst (Section 8.5):
In addition to those methods already discussed, ketones can also be prepared from certain carboxylic acid derivative, just as aldehydes can.