Dehydroacetic acid (dehydroacetic acid) is a white crystalline powder derived from pyrone .
| Dehydroacetic acid | |
|---|---|
 | |
| Are common | |
| Systematic name | 3-acetyl-2-hydroxy-6-methyl-4H-pyran-4-one |
| Traditional names | Dehydroacetic Acid, Dehydroacetic Acid, Biocide 470F, Harven |
| Chem. formula | C 8 H 8 O 4 |
| Physical properties | |
| condition | white crystalline powder |
| Molar mass | 168.14672 g / mol |
| Thermal properties | |
| T. melt. | 109-111 ° C |
| T. bale. | 269.9 ° C |
| Classification | |
| Reg. CAS number | 520-45-6 |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
| Codex Alimentarius | |
| ChemSpider | |
| Security | |
| LD 50 | 1000 mg / kg (for rats) |
It is practically insoluble in water ( solubility less than 0.1%), well soluble in acetone , benzene and other organic solvents.
Content
Application
It is used mainly as a fungicide and bactericidal agent. It is also used to impregnate packaging materials in order to protect fruits and vegetables during storage from rotting . The form of use is the sodium salt of dehydroacetic acid (Harven preparation), which has high solubility in water.
Dehydroacetic acid is also used in the cosmetics industry as a preservative (E265).
In the chemical industry has found application as a plasticizer for a number of synthetic rubbers.
Toxicity
LD50 for rats 1000 mg / kg. It does not irritate the skin and does not cause any chronic changes in the animal’s body, even when feeding them at a dose of 300 mg / kg for 7 weeks. The residual content is not standardized, since food products are not processed by the drug.
Getting
The laboratory method of synthesis is the self-condensation of acetoacetic ester in the presence of sodium bicarbonate [1] , the industrial method of obtaining dehydroacetic acid is dimetene dimerization.
Storage
Shelf-life Unlimited.