2H-1-Benzopyran, 7-hydroxy-4-methyl-2-oxo-
7-Hydroxy-4-methylcoumarin
CAS: 90-33-5
Molecular Formula: C10H8O3
2H-1-Benzopyran, 7-hydroxy-4-methyl-2-oxo- - Names and Identifiers
2H-1-Benzopyran, 7-hydroxy-4-methyl-2-oxo- - Physico-chemical Properties
| Molecular Formula | C10H8O3 |
| Molar Mass | 176.17 |
| Density | 1.1958 (rough estimate) |
| Melting Point | 188.5-190°C(lit.) |
| Boling Point | 267.77°C (rough estimate) |
| Water Solubility | slightly soluble |
| Solubility | Soluble in ethanol, acetic acid, alkali solution and ammonia, slightly soluble in hot water, ether and chloroform. |
| Appearance | Needle crystallization |
| Color | off-white to yellow |
| Maximum wavelength(λmax) | ['221nm, 251nm, 322nm'] |
| Merck | 14,4854 |
| BRN | 142217 |
| pKa | 7.79(at 25℃) |
| Storage Condition | 2-8°C |
| Stability | Stable. Combustible. Incompatible with strong oxidizing agents. |
| Refractive Index | 1.5036 (estimate) |
| MDL | MFCD00006866 |
| Physical and Chemical Properties | Needle-like crystals. Melting point 185-186 °c (194-195 °c) soluble in ethanol, acetic acid, alkali solution and ammonia, slightly soluble in hot water, ether and chloroform. And concentrated sulfuric acid in the role of blue fluorescence. |
| Use | This product is choleretic, and is an intermediate of the anti-allergic drug cromolyn sodium. |
2H-1-Benzopyran, 7-hydroxy-4-methyl-2-oxo- - Risk and Safety
| Risk Codes | 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 | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S36 - Wear suitable protective clothing. |
| WGK Germany | 2 |
| RTECS | GN7000000 |
| TSCA | Yes |
| HS Code | 29329990 |
| Hazard Note | Irritant |
| Toxicity | LD50 oral in rat: 3850mg/kg |
2H-1-Benzopyran, 7-hydroxy-4-methyl-2-oxo- - Reference
| Reference Show more | 1. Hu Yixi, Liu Ying, Huang Jianfeng, Huang Zhoufeng, Lu Guoshou. Screening of active anti-tumor sites in Yao medicine Xiaoliu Teng in vitro [J]. Pharmacology and Clinic of traditional Chinese medicine, 2019,35(05):52-56. 2. [IF = 2.896] Lu Wang et al."Electrochemical characters of hybrid at the graph modified electrode and its analytical application." Anal Methods-Uk. 2015 Mar;7(7):3000-3005 3. [IF = 2.447] Rui Zhang et al."Inhibitory effects of quercetin and its major metabolitin-3-o-β-D-glucoside on human UDP-glucuronosyperase 1A isoforms by liquid chromatography-tandem mass method." Exp Ther Med. 2021 Aug;22(2):1-8 |
2H-1-Benzopyran, 7-hydroxy-4-methyl-2-oxo- - Reference Information
| pH range of acid-base indicator discoloration | Green 1 uorescent (0.0) to weak blue 1 uorescent (2.0); weak blue 1 uorescent (6.5) blue 1 uorescent (8.0) |
| Main applications | color filter, electroluminescentis displays, document security processes, lasers, integrated circuits, liquid crystal displays, surface brightening composition, oil products, teeth whitening agent, antibacterial, entifungal |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| hydroxymethyl coumarin | 4-methylumbelliferone, also known as hydroxymethyl coumarin and Dantong, is a new cholagogue and coumarin derivative, white or white crystalline powder at room temperature, odorless, tasteless. Do not dissolve in water, slightly soluble in methanol, ethanol, soluble in sodium hydroxide solution, the biliary sphincter relaxation, with strong spasmolytic, analgesic effect, but also mild, continuously promote bile secretion, strengthen the gallbladder contraction and antibacterial effect, has obvious choleretic effect, is conducive to stone discharge, has a certain effect on common bile duct stones. Can reduce the liver enzyme, make it back to normal. It is mainly used for cholecystitis, biliary tract infection, cholelithiasis, biliary postoperative syndrome. Part of the original alanine aminotransferase increased patients, with the elimination of inflammation and returned to normal after taking the drug, individual dizziness, abdominal distension, chest tightness, rash, Diarrhea, etc., disappeared after drug withdrawal. Large doses can cause excessive secretion of bile with Diarrhea. Obstructive and Transmissibility jaundice hepatitis with caution. |
| purpose | This product is a choleretic drug, it is also an intermediate of sodium cromoglycate, an anti-allergic drug used as a pharmaceutical intermediate and is suitable for making laser dyes and the standard for fluorescence determination of enzyme activity. An indicator for the determination of nitric acid. laser dye, fluorescence assay for enzyme activity standard. An indicator for the determination of nitric acid. |
| production method | is obtained from the cyclization reaction of resorcinol and ethyl acetoacetate. The concentrated sulfuric acid was cooled to below 10 ° C., and a solution made up of resorcinol and ethyl acetoacetate was added dropwise with stirring, and the mixture was left for 12 hours after the dropping. The reactant was then poured into water containing crushed ice, and the precipitated precipitate was filtered off and refined with dilute sodium hydroxide solution and dilute sulfuric acid to obtain a finished product. |
Last Update：2024-04-09 21:11:58
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