| Customization: | Available |
|---|---|
| CAS No.: | 99-96-7 |
| Formula: | C7h6o3 |
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| 4-Hydroxybenzoic acid Chemical Properties |
| Melting point | 213-217 °C (lit.) |
| Boiling point | 213.5°C (rough estimate) |
| density | 1,46 g/cm3 |
| FEMA | 3986 | 4-HYDROXYBENZOIC ACID |
| refractive index | 1.4600 (estimate) |
| Fp | 199 °C |
| storage temp. | Store below +30°C. |
| solubility | methano l: soluble5%, clear to slightly hazy, colorless to faintly yellow |
| pka | 4.48(at 19ºC) |
| form | Crystalline Powder |
| color | White to ivory |
| PH | 3.3 (1g/l, H2O, 20ºC) |
| Water Solubility | 5 g/L (20 ºC) |
| JECFA Number | 957 |
| Merck | 14,4812 |
| BRN | 970950 |
| InChIKey | FJKROLUGYXJWQN-UHFFFAOYSA-N |
| CAS DataBase Reference | 99-96-7(CAS DataBase Reference) |
| NIST Chemistry Reference | Benzoic acid, 4-hydroxy-(99-96-7) |
| EPA Substance Registry System | p-Hydroxybenzoic acid (99-96-7) |
| Safety Information |
| Hazard Codes | Xi |
| Risk Statements | 36-36/37/38 |
| Safety Statements | 26-37/39-36 |
| WGK Germany | 1 |
| RTECS | DH1925000 |
| Autoignition Temperature | >250 °C |
| TSCA | Yes |
| HS Code | 29182930 |
| Hazardous Substances Data | 99-96-7(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: > 5000 mg/kg |
| 4-Hydroxybenzoic acid Usage And Synthesis |
| Chemical Properties | WHITE TO BEIGE CRYSTALLINE POWDER |
| Chemical Properties | 4-Hydroxybenzoic acid is an odorless white crystalline astringent powder. In pure form, it imparts a sweetish taste at first, which quickly becomes acrid and disagreeable |
| Occurrence | Reportedly present in apple juice, black currant, cheese, beer, grape brandy, rum, sherry, wines, cocoa, peanut, soybean and wort. |
| Uses | p-Hydroxybenzoic acid is of significant commercial importance. The most familiar application is the use of several of its esters as preservatives, known as parabens. Also of interest is the use in liquid crystal polymer applications. |
| Uses | Acetylsalicylic Acid Impurity A |
| Uses | In organic. syntheses; intermediate for dyes, fungicides. |
| Definition | ChEBI: A monohydroxybenzoic acid that is benzoic acid carrying a hydroxy substituent at C-4 of the benzene ring. |
| Preparation | Prepared from p-bromopheno l or p-hydroxybenzaldehyde, or from saponification of methyl salicylate, a major component of oil of wintergreen. |
| Aroma threshold values | Detection at 5 ppm (water) |
| Synthesis Reference(s) | Journal of the American Chemical Society, 106, p. 174, 1984 DOI: 10.1021/ja00313a035 The Journal of Organic Chemistry, 29, p. 3459, 1964 DOI: 10.1021/jo01035a003 |
| Purification Methods | Crystallise the hydroxyacid from water. [Beilstein 10 IV 345.] |
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