Dehydroacetic acid
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| Abbreviations | DHAA |
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| MeSH | dehydroacetic+acid |
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| Appearance | White crystals |
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Dehydroacetic acid is an organic compound which has several industrial applications. The compound is classified as a pyrone derivative. It presents as an odorless, colorless to white crystalline powder, almost insoluble in water and moderately soluble in most organic solvents.[2]
Preparation
It is prepared by the base-catalysed dimerization of diketene.[3] Commonly used organic bases include imidazole, DABCO, and pyridine.[4]
Uses
Industrially, dehydroacetic acid has several uses which include the following:
- as a fungicide and bactericide. The sodium salt, sodium dehydroacetate, is often used in place of dehydroacetic acid because of its greater solubility in water.
- as a food preservative to prevent pickle bloating in squash and strawberries.[5] When used as a food additive, dehydroacetic acid is referred to using the International Numbering System for Food Additives or E number 265.
- as a plasticizer in synthetic resins.[1]
- as an antienzyme in toothpastes.
- as a precursor for dimethyl-4-pyridones. The compounds are synthesized when dehydroacetic acid is exposed to aqueous solutions containing primary amines.[6]
References
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- ↑ a b Merck Index, 11th Edition, 2855
- ↑ Script error: No such module "Citation/CS1".
- ↑ Raimund Miller, Claudio Abaecherli, Adel Said, Barry Jackson. "Ketenes". In Ullmann's Encyclopedia of Industrial Chemistry. 2001, Wiley-VCH, Weinheim. Script error: No such module "CS1 identifiers".
- ↑ Script error: No such module "citation/CS1".
- ↑ Harold William Rossmoore. Handbook of Biocide and Preservative Use, p. 341. Template:ISBN
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