The three-carbon diol used in antifreeze is It is nontoxic...

The three-carbon diol used in antifreeze is
It is nontoxic and is used as a moisturizing agent in foods. Oxidation of this substance within the liver produces pyruvic acid, which can be used by the body to supply energy. Give the structure of pyruvic acid.

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Key Concepts

Organic Functional Groups

Understanding organic functional groups, such as the carbonyl group in ketones and the carboxyl group in acids, is fundamental in organic chemistry. These groups determine the physical and chemical properties of molecules. In the case of pyruvic acid, the presence of both a ketonic and a carboxylic acid group not only defines its chemical behavior but also underlies its role as a metabolic intermediary in various biochemical pathways.

Alpha-Keto Acids

Alpha-keto acids are organic compounds that feature both a ketone and a carboxylic acid group, with the ketone located on the alpha carbon relative to the carboxyl group. Their structure makes them important intermediates in metabolism, as they are often formed by the oxidation of corresponding alcohols or diols and can be further transformed in cellular respiration, linking carbohydrate metabolism with energy production.

Pyruvic Acid

Pyruvic acid is a small, three?carbon molecule that plays a central role in metabolism. It is classified as an alpha-keto acid because it contains a keto group (a carbonyl, C=O) attached to the carbon adjacent to a carboxylic acid group (COOH). This dual functional group structure is key to its reactivity, as it can participate in various biochemical reactions, including energy production through the citric acid cycle.

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