Di-o-Cresolphthalide
CAS: 596-27-0
Molecular Formula: C22H18O4
Di-o-Cresolphthalide - Names and Identifiers
| Synonyms | cresolphthalein o-Cresolphalein o-cresolphtaleine Di-o-Cresolphthalide 3',3''-dimethyl-phenolphthalei 3,3-bis(4-hydroxy-3-methylphenyl)-1(3h)-isobenzofuranon 3,3-bis(4-hydroxy-3-methylphenyl)-(3H)-Isobenzofuranone 3,3-Bis(4-hydroxy-3-methylphenyl)-1-(3H)-iso-benzofuranone |
| CAS | 596-27-0 |
| EINECS | 209-881-8 |
| InChIKey | CPBJMKMKNCRKQB-UHFFFAOYSA-N |
Di-o-Cresolphthalide - Physico-chemical Properties
| Molecular Formula | C22H18O4 |
| Molar Mass | 346.38 |
| Density | 1.1425 (rough estimate) |
| Melting Point | 223-225 °C |
| Boling Point | 401.12°C (rough estimate) |
| Water Solubility | slightly soluble |
| Solubility | Solubility Slightly soluble in water; soluble in ethanol |
| Appearance | powder |
| Color | Clear colorless |
| Maximum wavelength(λmax) | ['566nm, 381nm'] |
| Merck | 14,2576 |
| BRN | 310554 |
| pKa | 9.40(at 25℃) |
| Storage Condition | RT, dark, 12 months |
| Refractive Index | 1.4400 (estimate) |
| Physical and Chemical Properties | White or red yellow crystalline powder. Melting point 223 ℃, soluble in ethanol, ether, glacial acetic acid, soluble in dilute alkali, purple, slightly soluble in water, hardly soluble in benzene. |
| Use | This product is for scientific research only and shall not be used for other purposes. |
Di-o-Cresolphthalide - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R40 - Limited evidence of a carcinogenic effect R36/37/38 - Irritating to eyes, respiratory system and skin. R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S36/37 - Wear suitable protective clothing and gloves. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| UN IDs | 1170 |
| WGK Germany | 3 |
| RTECS | SM8390000 |
| TSCA | Yes |
Di-o-Cresolphthalide - Introduction
The color change range of o-cresolphthalein: pH8.2-9.8, the color changes from colorless to red.
Last Update：2022-10-16 17:36:48
Di-o-Cresolphthalide - Reference Information
| pH range of acid-base indicator discoloration | 8.2 (colorless) - 9.8 (violet/red) |
| Main application | Sensors, display device, photoresistance, recording materials, imaging materials, authentication system for secure documents, decoder system, lithium cells, electroplating process, inks, markers, toners, correction fluid, paints, adhetions, floor coatings, gas leakage detector for safety in industries, toys, food storage, determination of calcium, lotions, urine analysis test strips, drugs, blood analysis |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | acid-base indicator, color change range pH8.2 (colorless)-9.8 (red). used as acid-base indicator |
| production method | is obtained by condensation of phthalic anhydride with O-toluene. Phthalic anhydride and O-cresol were mixed and heated to melt, anhydrous zinc chloride was added at 110 °c, and the reaction was stirred at 110-115 °c for 12-18H, and steam was introduced to drive out the remaining O-cresol. The resulting crude sodium hydroxide solution was dissolved and filtered. The filtrate was neutralized with dilute hydrochloric acid to obtain white crystals as the finished product. |
Last Update：2024-04-09 02:00:13
