Hydroxy ketone

In organic chemistry a hydroxy ketone (often referred to simply as a ketol) is a functional group consisting of a ketone flanked by a hydroxyl group. In the two main classes, the hydroxyl group can be placed in the alpha position (an alpha-hydroxy ketone RCR′(OH)(CO)R) or in the beta position (a beta-hydroxy ketone, RCR′(OH)CR₂(CO)R).

• An α-hydroxy ketone can consist of either a primary alcohol (e.g. hydroxyacetone) or a secondary alcohol; the latter are often broadly referred to as acyloins^[1]
• Prominent β-hydroxy ketones are aldol adducts.
• Only terminal α-hydroxy ketones can give positive Fehling's test.

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