Products Description of Trimethyl Borate CAS#121-43-7
Trimethyl Borate, also known as methyl borate, has CAS#121-43-7 with molecular formula B(OCH3)3. It is a colorless transparent volatile liquid at room temperature, boiling at 68-69°C. This organoboron compound serves as an important boron source and synthetic reagent for boronic acid and boronic ester preparation.
The compound belongs to highly flammable chemicals . It can mix evenly with ether, methanol, tetrahydrofuran, isopropylamine, hexane and other common organic solvents. It keeps stable in water-free surroundings and undergoes hydrolysis once exposed to water, yielding methanol and boric acid as decomposition products.
Trimethyl Borate Chemical Properties
| Melting point | -34 °C (lit.) |
| Boiling point | 68-69 °C (lit.) |
| density | 0.932 g/mL at 20 °C (lit.) |
| vapor density | 3.59 (vs air) |
| refractive index | n20/D 1.358(lit.) |
| Fp | 8 °F |
| storage temp. | Store at <= 20°C. |
| solubility | Miscible with tetrahydrofuran, ether, isoporpylamine, hexane and methanol. |
| form | Liquid |
| Specific Gravity | 0.915 |
| color | Colorless |
| Water Solubility | reacts |
| Sensitive | Moisture Sensitive |
| Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
| Merck | 149712 |
| BRN | 1697939 |
| Dielectric constant | 8.2（20℃） |
| Exposure limits | ACGIH: TWA 200 ppm; STEL 250 ppm (Skin) |
| OSHA: TWA 200 ppm(260 mg/m3) | |
| NIOSH: IDLH 6000 ppm; TWA 200 ppm(260 mg/m3); STEL 250 ppm(325 mg/m3) | |
| Stability: | Stable. Incompatible with oxidizing agents. Decomposes slowly in the presence of moisture, rapidly in water. Flammable. |
| InChIKey | WRECIMRULFAWHA-UHFFFAOYSA-N |
| CAS DataBase Reference | 121-43-7(CAS DataBase Reference) |
| NIST Chemistry Reference | Boric acid, trimethyl ester(121-43-7) |
| EPA Substance Registry System | Boric acid (H3BO3), trimethyl ester (121-43-7) |
| Hazard Codes | Xn,F,T |
| Risk Statements | 11-21-23/25-36/37/38-10-36-61-60 |
| Safety Statements | 16-27-36/37/39-45-25-23-2-26-53 |
| RIDADR | UN 2416 3/PG 2 |
| WGK Germany | 3 |
| RTECS | ED5600000 |
| F | 21 |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29209085 |
| Hazardous Substances Data | 121-43-7(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 6.14 ml/kg (Smyth) |
Product Application of Trimethyl Borate CAS#121-43-7
Trimethyl borate acts as a vital synthetic intermediate to manufacture sodium borohydride and potassium borohydride. Apart from this core usage, the chemical works as a vulcanizing additive, wood preservation agent, reaction catalyst, gelling ingredient and thermal stabilizer for different industrial-grade materials.
This substance can also serve as a suppression medium for hydrogen flame and conduct flame-resistant processing on cotton textiles. Manufacturers adopt it for the synthesis of activated silica. Besides, it is prepared as an analytical reagent when workers carry out gas-chromatography detection targeting carbohydrate derivatives.
