81-84-5
1,8-Naphthalic anhydride
CAS: 81-84-5
Molecular Formula: C12H6O3
81-84-5 - Names and Identifiers
| Name | 1,8-Naphthalic anhydride |
| Synonyms | ai3-09071 naphthalic Naphthalic anh 1,8-Naphthalic anhydride 1,8 Naphthaloic Anhydride Two1,8-naphthaleneanhydride Benzo[de]isochromene-1,3-dione naphthalenedicarboxylicanhydride Naphthalenedicarboxylic-1,8-anhydride |
| CAS | 81-84-5 |
| EINECS | 201-380-2 |
| InChI | InChI=1/C24H14O7/c25-21(26)15-9-1-5-13-7-3-11-17(19(13)15)23(29)31-24(30)18-12-4-8-14-6-2-10-16(20(14)18)22(27)28/h1-12H,(H,25,26)(H,27,28) |
81-84-5 - Physico-chemical Properties
| Molecular Formula | C12H6O3 |
| Molar Mass | 198.17 |
| Density | 1.2571 (rough estimate) |
| Melting Point | 269 °C |
| Boling Point | 295.48°C (rough estimate) |
| Flash Point | 272 °C |
| Water Solubility | decomposes |
| Solubility | Chloroform (Slightly, Heated), DMSO |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | Powder |
| Color | Beige to light brown |
| BRN | 153190 |
| Storage Condition | Store below +30°C. |
| Sensitive | Moisture Sensitive |
| Refractive Index | 1.5550 (estimate) |
| Physical and Chemical Properties | Characteristics of precipitation of needle-like crystals in ethanol, diamond-like crystals in acetic acid. melting point 267~269 ℃ solubility: insoluble in water, ether, benzene, slightly soluble in hot ethanol, soluble in hot acetic acid. |
| Use | Is an important raw material for the synthesis of perylene dyes, pigments and fluorescent whitening agents |
81-84-5 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| 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 S24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 2 |
| RTECS | QK5350000 |
| FLUKA BRAND F CODES | 21 |
| TSCA | Yes |
| HS Code | 29173980 |
81-84-5 - Nature
Open Data Verified Data
needle-like crystals were precipitated in ethanol, and diamond-like crystals were precipitated in acetic acid. Do not dissolve in water, ether, benzene, hot ethanol-soluble, soluble in hot acetic acid. Melting point 267~269 ℃, sublimation, no boiling point.
Last Update：2025-06-10 22:55:16
81-84-5 - Preparation Method
Open Data Verified Data
The industrial process is vaporized with primary air, mixed with secondary air, and oxidized to 1,8 naphthalene dicarboxylic anhydride with cobalt as a catalyst, and then cooled.
Last Update：2022-01-01 10:44:04
81-84-5 - Application
Open Data Verified Data
intermediates for dyes, pesticides, pharmaceuticals and polyester resins.
Last Update：2025-08-19 16:24:40
81-84-5 - Safety
Open Data Verified Data
- This product is toxic, toxicity and phthalic anhydride similar, can stimulate the eye mucosa and respiratory tract. Rat oral LD50 12340mg/kg, should avoid contact with the eyes, oral cavity. Wear protective glasses and masks during operation. Accidental contamination can be treated according to general irritation.
- The bag is packed in plastic bag, which is heat-proof, moisture-proof, sun-proof, and stored in a cool, ventilated and dry place. Hazardous materials shall be stored and transported according to regulations.
Last Update：2022-01-01 10:44:05
81-84-5 - Reference Information
| LogP | 3.24 |
| surface tension | 72.5mN/m at 1.3mg/L and 20 ℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | is an important raw material for the synthesis of perylene dyes, pigments and fluorescent whitening agents used as dyes, pesticides, intermediates for pharmaceuticals and polyester resins. as an important raw material for the synthesis of perylene dyes, pigments and fluorescent brighteners |
| production method | the industrial process uses primary air vaporization, mixed with secondary air, and cobalt as catalyst, after oxidation to 1,8-naphthalene dicarboxylic anhydride, and then cooled to get. Raw material consumption quota: industrial scale: 143-1500kg/t. |
| category | relatively flammable solid |
| toxicity grade | low toxicity |
| Acute toxicity | oral-rat LD50: 12340 mg/kg |
| flammability hazard characteristics | in case of open flame, high temperature, flammable oxidant |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from the oxidant |
| extinguishing agent | water, dry sand, carbon dioxide, foam, 1211 extinguishing agent |
| Occupational Standard | PEL 2 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 20:52:54
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