reductones

https://doi.org/10.1351/goldbook.R05224
Compounds containing an enediol structure stabilized by @C01267@ and hydrogen bonding with an adjacent carbonyl group, RC(OH)=C(OH)C(=O)R. They are strong reducing agents, fairly strong acids and commonly derived from @S05441@ by @O04362@ at the carbon atom alpha to the carbonyl function, e.g. ascorbic acid.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1363 [Terms] [Paper]