Ketone
Definition and meaning of Ketone in chemistry.
A ketone is an organic compound containing a carbonyl group (C=O) bonded to two carbon atoms rather than to hydrogen. Ketones are found throughout nature and serve as important solvents, reagents, and metabolic intermediates in chemistry and biochemistry.
In more detail
In a ketone, the carbonyl carbon is sp2 hybridized and bonded to two alkyl, cycloalkyl, or aryl groups, distinguishing ketones from aldehydes, which have the carbonyl bonded to one hydrogen. Ketones are relatively unreactive compared to aldehydes, resisting oxidation under mild conditions, which makes them valuable as solvents and synthetic intermediates. They also play crucial metabolic roles as ketone bodies (acetoacetate, beta-hydroxybutyrate, and acetone), produced during fasting or low-carbohydrate states and serving as alternative fuel for the brain and muscles.
Key facts
| Field | Organic Chemistry |
|---|---|
| Functional Group | C=O bonded to two carbon atoms |
| General Formula | R-CO-R' (where R and R' are alkyl or aryl groups) |
| Example | Acetone (CH3COCH3) |
Acetone (CH3COCH3) is the simplest ketone and is widely used as a solvent in laboratories, nail polish removers, and industrial processes, as well as a key starting material for synthesizing numerous pharmaceuticals and polymers.
Frequently asked questions
How do ketones differ from aldehydes?
The main difference is that in ketones the carbonyl group is bonded to two carbons, whereas in aldehydes it is bonded to one carbon and one hydrogen atom. This makes aldehydes more easily oxidized.
Why are ketone bodies important in human metabolism?
During fasting or when carbohydrates are restricted, the body converts fatty acids to ketone bodies (mainly acetoacetate and beta-hydroxybutyrate) in the liver, which the brain and muscles can use as an efficient alternative fuel source.