Pelargonic acid, also called nonanoic acid, is an organic compound with structural formula CH3(CH2)7CO2H. It is a nine-carbon fatty acid. Nonanoic acid is a colorless oily liquid with an unpleasant, rancid odor. It is nearly insoluble in water, but very soluble in organic solvents. The esters and salts of pelargonic acid are called pelargonatesornonanoates.
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| Names | |
|---|---|
| Preferred IUPAC name
Nonanoic acid | |
| Other names
Nonoic acid; nonylic acid; 1-octanecarboxylic acid; C9:0 (lipid numbers) | |
| Identifiers | |
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3D model (JSmol) |
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| 1752351 | |
| ChEBI | |
| ChemSpider |
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| ECHA InfoCard | 100.003.574 
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| EC Number |
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| 185341 | |
| KEGG |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C9H18O2 | |
| Molar mass | 158.241 g/mol |
| Appearance | Clear to yellowish oily liquid |
| Density | 0.900 g/cm3 |
| Melting point | 12.5 °C (54.5 °F; 285.6 K) |
| Boiling point | 254 °C (489 °F; 527 K) |
| Critical point (T, P) | 439 °C (712 K), 2.35 MPa |
| 0.3 g/L | |
| Acidity (pKa) |
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Refractive index (nD) |
1.4322 |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Corrosive |
| GHS labelling: | |
 
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| Warning | |
| H315, H319, H412 | |
| P264, P273, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | 114 °C (237 °F; 387 K) |
| 405 °C (761 °F; 678 K) | |
| Related compounds | |
Related compounds |
Octanoic acid, decanoic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The acid is named after the pelargonium plant, since oil from its leaves contains esters of the acid.
Together with azelaic acid, it is produced industrially by ozonolysisofoleic acid.[2]
Alternatively, pelargonic acid can be produced in a two-step process beginning with coupled dimerization and hydroesterification of 1,3-butadiene. This step produces a doubly unsaturated C9-ester, which can be hydrogenated to give esters of pelargonic acid.[3]
A laboratory preparation involves permanganate oxidation of 1-decene.[4]
Pelargonic acid occurs naturally as esters in the oil of pelargonium.
Synthetic esters of pelargonic acid, such as methyl pelargonate, are used as flavorings. Pelargonic acid is also used in the preparation of plasticizers and lacquers. The derivative 4-nonanoylmorpholine is an ingredient in some pepper sprays.
The ammonium salt of pelargonic acid, ammonium pelargonate, is a herbicide. It is commonly used in conjunction with glyphosate, a non-selective herbicide, for a quick burn-down effect in the control of weeds in turfgrass. It works by causing leaks in plant cell membranes, allowing chlorophyll molecules to escape the chloroplast. Under sunlight, these misplaced molecules cause immense oxidative damage to the plant.[5]
The methyl form and ethylene glycol pelargonate act as nematicides against Meloidogyne javanicaonSolanum lycopersicum, and the methyl against Heterodera glycines and M. incognitaonGlycine max.[6]
Esters of pelargonic acid are precursors to lubricants.
Pelargonic acid may be more potent than valproic acid in treating seizures.[7] Moreover, in contrast to valproic acid, pelargonic acid exhibited no effect on HDAC inhibition, suggesting that it is unlikely to show HDAC inhibition-related teratogenicity.[7]
