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Cas Database |
| Name |
Trimethyl borate |
EINECS | 204-468-9 |
| CAS No. | 121-43-7 | Density | 0.932 g/mL at 20 °C(lit.) |
| PSA | 27.69000 | LogP | -0.08950 |
| Solubility | decomposes in water | Melting Point |
-34 °C |
| Formula | C3H9BO3 | Boiling Point | 67.5 °C at 760 mmHg |
| Molecular Weight | 103.914 | Flash Point | -8 °C |
| Transport Information | UN 2416 3/PG 2 | Appearance | water-white liquid |
| Safety | 16-27-36/37/39-45-25-23-2 | Risk Codes | 11-21-23/25-36/37/38-10 |
| Molecular Structure |
|
Hazard Symbols |
 Xn, F
|
| Synonyms |
NSC 777;Trimethoxyborane;Trimethoxyborine;Trimethoxyboron;Boricacid (H3BO3), trimethyl ester;Methylborate ((MeO)3B) (6CI);Borester O;Boric acid trimethyl ester;Borontrimethoxide; |
Article Data | 266 |
Trimethyl borate Synthetic route
- 446822-71-5
(borane)diphenylphosphinomethanethiol acetate
- 67-56-1
methanol
A
- 121-43-7
Trimethyl borate
B
- 324753-11-9
thioacetic acid S-[(diphenylphosphanyl)methyl] ester
| Conditions | Yield |
|---|---|
| In toluene at 100℃; Inert atmosphere; | A n/a B 100% |
- 67-56-1
methanol
- 1186392-98-2
diphenyl(2-pyridyl)phosphane(P-B)borane(1:1)
A
- 121-43-7
Trimethyl borate
B
- 37943-90-1
2-(diphenylphosphino)pyridine
| Conditions | Yield |
|---|---|
| at 120℃; Inert atmosphere; Microwave irradiation; | A n/a B 100% |
- 67-56-1
methanol
- 24442-15-7
methylenebis(diphenylphosphane)-borane(1:2)
A
- 121-43-7
Trimethyl borate
B
- 2071-20-7
bis-diphenylphosphinomethane
| Conditions | Yield |
|---|---|
| In toluene at 100℃; Inert atmosphere; | A n/a B 100% |
- 155402-41-8
dimethoxyboryl trimethylsilyl ketene
A
- 2916-76-9
methyl (trimethylsilyl)acetate
B
- 121-43-7
Trimethyl borate
| Conditions | Yield |
|---|---|
| With methanol In diethyl ether for 0.5h; | A 77% B 99% |
| With methanol In diethyl ether methanol in abs. ether added to a soln. of the ketene, warmed up, further methanol added, stirred for 30 min; distd.; | A 77% B 90% |
| Conditions | Yield |
|---|---|
| With CH3OH In pentane byproducts: H2; (Ar (N2) or vac.); dropwise addn. of excess of MeOH to Zr-complex in pentane with stirring (60 min, room temp.), stirring (1 h), standing (12-17 h); volatiles and solvent distn. (vac.); elem. anal.; | A n/a B 99% |
- 67-56-1
methanol
- 2049-55-0
triphenylphosphine borane
A
- 121-43-7
Trimethyl borate
B
- 603-35-0
triphenylphosphine
| Conditions | Yield |
|---|---|
| at 120℃; Inert atmosphere; Microwave irradiation; | A n/a B 99% |
- 67-56-1
methanol
- 100809-49-2
(propane-1,3-diyl)bis(diphenylphosphane)-borane(1:2)
A
- 121-43-7
Trimethyl borate
B
- 6737-42-4
1,3-bis-(diphenylphosphino)propane
| Conditions | Yield |
|---|---|
| In toluene at 100℃; Inert atmosphere; | A n/a B 98% |
| Conditions | Yield |
|---|---|
| With 1,3,5-Tri-tert-butylbenzene; bis-(phosphoranyl)methanido aluminum hydride In benzene-d6 at 110℃; for 1h; Solvent; Schlenk technique; | A n/a B 97.6% |
| Conditions | Yield |
|---|---|
| methanolysis; | A n/a B 97% |
- 67-56-1
methanol
- 1186392-99-3
(2-biphenyl)dicyclohexylphosphane-borane(1:1)
A
- 121-43-7
Trimethyl borate
B
- 247940-06-3
CyJohnPhos
| Conditions | Yield |
|---|---|
| In toluene at 100℃; Inert atmosphere; | A n/a B 97% |
Trimethyl borate Chemical Properties
IUPAC Name: Trimethyl borate
Molecular Formula: C3H9BO3
EINECS: 204-468-9
Molecular Weight: 103.912760 g/mol
Appearance: Colorless clear liquid
Melting Point: -34 °C
Boiling Point: 68-69 °C(lit.)
Flash Point: 8 °F
Density: 0.932 g/mL at 20 °C(lit.)
Vapor density: 3.59 (vs air)
Refractive index: n20/D 1.358(lit.)
Sensitive: Moisture
Solubility: Ether, methanol, tetrahydrofuran, isopropylamine, and hexane
Structure of Trimethyl borate (CAS NO.121-43-7):
Product Category of Trimethyl borate (CAS NO.121-43-7): Boron Compounds;Organometallics;Boric Acid Esters;Boric Acid Triesters
Trimethyl borate Uses
Trimethyl borate (121-43-7) is primarily used as a precursor to boronic esters and boronic acids for Suzuki couplings.
Other uses include :
1.Anti-oxidant in Brazing and Solder Flux
2.Catalyst of olefin polymerisation
3.Wood preservative
4.raw material in the production of specialty glasses using sol-gel technology
5.raw material in the production of borophosphosilicate glass film by chemical vapor deposition
6.component of some flame retardants in textile industry
7.component of some welding fluxes
8.in green fire compositions for special effects (as a solution of boric acid in methanol, where it forms in small amounts)
Trimethyl borate Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| mouse | LD50 | oral | 1290mg/kg (1290mg/kg) | "Boron, Metallo-Boron Compounds and Boranes," Adams, R.M., ed., New York, John Wiley & Sons, Inc., 1964Vol. -, Pg. 693, 1964. | |
| mouse | LDLo | intraperitoneal | 1gm/kg (1000mg/kg) | "Boron, Metallo-Boron Compounds and Boranes," Adams, R.M., ed., New York, John Wiley & Sons, Inc., 1964Vol. -, Pg. 693, 1964. | |
| rabbit | LD50 | skin | 1980uL/kg (1.98mL/kg) | American Industrial Hygiene Association Journal. Vol. 23, Pg. 95, 1962. | |
| rabbit | LDLo | intraperitoneal | 1600mg/kg (1600mg/kg) | "Boron, Metallo-Boron Compounds and Boranes," Adams, R.M., ed., New York, John Wiley & Sons, Inc., 1964Vol. -, Pg. 693, 1964. | |
| rat | LD50 | oral | 6140mg/kg (6140mg/kg) | "Boron, Metallo-Boron Compounds and Boranes," Adams, R.M., ed., New York, John Wiley & Sons, Inc., 1964Vol. -, Pg. 693, 1964. | |
| rat | LDLo | intraperitoneal | 1600mg/kg (1600mg/kg) | "Boron, Metallo-Boron Compounds and Boranes," Adams, R.M., ed., New York, John Wiley & Sons, Inc., 1964Vol. -, Pg. 693, 1964. |
Trimethyl borate Safety Profile
Hazard Codes: 
Xn,
F
Risk Statements: 11-21-23/25-36/37/38-10
R10:Flammable.
R11:Highly flammable.
R21:Harmful in contact with skin.
R23/25:Toxic by inhalation and if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 16-27-36/37/39-45-25-23-2
S16:Keep away from sources of ignition.
S23:Do not breathe vapour.
S25:Avoid contact with eyes.
S27:Take off immediately all contaminated clothing.
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
Trimethyl borate Specification
Trimethyl borate , its cas register number is 121-43-7. It also can be called Boric acid trimethyl ester ; Methyl borate ; and Boron methoxide .
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