In organic chemistry, a dicarboxylic acid is an organic compound containing two carboxyl groups (). The general molecular formula for dicarboxylic acids can be written as , where R can be aliphatic or aromatic. In general, dicarboxylic acids show similar chemical behavior and reactivity to monocarboxylic acids.
Dicarboxylic acids are used in the preparation of copolymers such as polyamides and polyesters. The most widely used dicarboxylic acid in the industry is adipic acid, which is a precursor in the production of nylon. Other examples of dicarboxylic acids include aspartic acid and glutamic acid, two amino acids in the human body. The name can be abbreviated to diacid.
The general formula for acyclic dicarboxylic acid is HO2C(CH2)nCO2H. The PubChem links gives access to more information on the compounds, including other names, ids, toxicity and safety.
Acids from the two-carbon oxalic acid to the ten-member sebacic acid may be remembered using the mnemonic 'Oh My Son, Go And Pray Softly And Silently', and also 'Oh my! Such great Apple Pie, sweet as sugar!'.
{| class="wikitable"
|+
! n !! Common name !! Systematic IUPAC name !! Structure !! pKa1 !! pKa2 !! PubChem
|-
| 0 || Oxalic acid || ethanedioic acid || || 1.27 || 4.27 || 971
|-
| 1 || Malonic acid || propanedioic acid || || 2.85 || 5.05 || 867
|-
| 2 || Succinic acid || butanedioic acid || || 4.21 || 5.41 || 1110
|-
| 3 || Glutaric acid || pentanedioic acid || || 4.34 || 5.41 || 743
|-
| 4 || Adipic acid || hexanedioic acid || || 4.41 || 5.41 || 196
|-
| 5 || Pimelic acid || heptanedioic acid || || 4.50 || 5.43 || 385
|-
| 6 || Suberic acid || octanedioic acid || || 4.526 || 5.498 || 10457
|-
| 6 || || 1,4-Cyclohexanedicarboxylic acid || || || ||14106
|-
| 7 || Azelaic acid || nonanedioic acid || || 4.550 || 5.498 || 2266
|-
| 8 || Sebacic acid || decanedioic acid || || 4.720 || 5.
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Maleic acid or cis-butenedioic acid is an organic compound that is a dicarboxylic acid, a molecule with two carboxyl groups. Its chemical formula is HO2CCH=CHCO2H. Maleic acid is the cis-isomer of butenedioic acid, whereas fumaric acid is the trans-isomer. It is mainly used as a precursor to fumaric acid, and relative to its parent maleic anhydride, maleic acid has few applications. Maleic acid has a heat of combustion of -1,355 kJ/mol., 22.7 kJ/mol higher than that of fumaric acid.
Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in plants and insects, as well as synthetics such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. Synthetic polyesters are used extensively in clothing.
Succinic acid (səkˈsɪnᵻk) is a dicarboxylic acid with the chemical formula (CH2)2(CO2H)2. In living organisms, succinic acid takes the form of an anion, succinate, which has multiple biological roles as a metabolic intermediate being converted into fumarate by the enzyme succinate dehydrogenase in complex 2 of the electron transport chain which is involved in making ATP, and as a signaling molecule reflecting the cellular metabolic state. Succinate is generated in mitochondria via the tricarboxylic acid cycle (TCA).
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