Naphthalene,2-methyl-
2-Methylnaphthalene
CAS: 91-57-6
Molecular Formula: C11H10
Naphthalene,2-methyl- - Names and Identifiers
| Name | 2-Methylnaphthalene |
| Synonyms | 2-methyl 2-Methylnaphth Methylnaphthalene 2-Methylnaphthalene β-Methylnaphthalene 2-methyl-naphthalen 2-methyInaphthalene 2-METHYLNAPHTHALENE Methyl-2-naphthalene Para-Aminoacetanilide Naphthalene,2-methyl- naphthalene,beta-methyl 2-Methylnaphthalene (beta) |
| CAS | 91-57-6 |
| EINECS | 202-078-3 |
| InChI | InChI=1/C11H10/c1-9-6-7-10-4-2-3-5-11(10)8-9/h2-8H,1H3 |
| InChIKey | QIMMUPPBPVKWKM-UHFFFAOYSA-N |
Naphthalene,2-methyl- - Physico-chemical Properties
| Molecular Formula | C11H10 |
| Molar Mass | 142.2 |
| Density | 1.01 |
| Melting Point | 34-36°C(lit.) |
| Boling Point | 241-242°C(lit.) |
| Flash Point | 208°F |
| Water Solubility | 0.00246 g/100 mL |
| Solubility | 0.025g/l |
| Vapor Presure | 5.4 (extrapolated, Mackay et al., 1982) |
| Appearance | Crystalline Low Melting Solid |
| Color | White |
| Exposure Limit | ACGIH: TWA 0.5 ppm (Skin) |
| BRN | 906859 |
| Storage Condition | 2-8°C |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Refractive Index | 1.6019 |
| Physical and Chemical Properties | White or pale yellow monoclinic crystals or fused crystals. boiling point 241 ℃ freezing point 34.5 ℃ relative density 1.0058 refractive index 1.6019 solubility insoluble in water, soluble in organic solvents such as ethanol and ether. |
| Use | Production of vitamin K3 raw materials, oral contraceptives, synthetic plant growth inhibitors, also used as surfactants, water reducing agents, dispersants, etc |
Naphthalene,2-methyl- - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system and skin. R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R63 - Possible risk of harm to the unborn child R43 - May cause sensitization by skin contact R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R45 - May cause cancer R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R67 - Vapors may cause drowsiness and dizziness R40 - Limited evidence of a carcinogenic effect |
| 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 S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S36/37 - Wear suitable protective clothing and gloves. S24/25 - Avoid contact with skin and eyes. S23 - Do not breathe vapour. S53 - Avoid exposure - obtain special instructions before use. S36 - Wear suitable protective clothing. S29 - Do not empty into drains. |
| UN IDs | UN 3077 9/PG 3 |
| WGK Germany | 2 |
| RTECS | QJ9635000 |
| TSCA | Yes |
| HS Code | 29029080 |
| Hazard Class | 9 |
| Packing Group | III |
| Toxicity | Acute oral LD50 for rats 1,630 mg/kg (quoted, RTECS, 1985). |
Naphthalene,2-methyl- - Nature
Open Data Verified Data
white or pale yellow monoclinic crystals or fused crystals. Relative density (d20) 1.0058. Boiling point 241 °c. The freezing point was 34.5 °c. Refractive index 6019. Insoluble in water, soluble in ethanol and ether and other organic solvents, flammable.
Last Update：2024-01-02 23:10:35
Naphthalene,2-methyl- - Preparation Method
Open Data Verified Data
In the high temperature tar content of about 1.8%. With the washing oil in coal tar as raw material, after dephenolization and depyridinium alkali removal, the methyl naphthalene fraction at 240~245 ℃ was cut by rectification and frozen to -20 ℃. At this time, 2-methyl naphthalene was crystallized and precipitated. Then use sweating crystallization method or methanol, ethanol recrystallization refined, that is, the product.
Last Update：2022-01-01 10:39:58
Naphthalene,2-methyl- - Use
Open Data Verified Data
in medicine for the preparation of vitamin K3, oxidation of p-naphthol, long-acting or short-acting oral contraceptives. Synthetic plant growth inhibitor in agriculture, DDT emulsifier; After sulfonation can be used as detergent, can also be used as fiber dyeing agent and wetting agent of raw materials.
Last Update：2022-01-01 10:39:57
Naphthalene,2-methyl- - Safety
Open Data Verified Data
- This product is less toxic than naphthalene. The maximum allowable concentration in the air of the workplace is 20mg/m3. The operator should wear protective gear.
- packaging and storage of this product with 1 methyl naphthalene.
Last Update：2022-01-01 10:39:58
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