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121-43-7

Basic Information
CAS No.: 121-43-7
Name: Trimethyl borate
Molecular Structure:
Molecular Structure of 121-43-7 (Trimethyl borate)
Formula: C3H9BO3
Molecular Weight: 103.91
Synonyms: NSC 777;Trimethoxyborane;Trimethoxyborine;Trimethoxyboron;Boricacid (H3BO3), trimethyl ester;Methylborate ((MeO)3B) (6CI);Borester O;Boric acid trimethyl ester;Borontrimethoxide;
EINECS: 204-468-9
Density: 0.932 g/mL at 20 °C(lit.)
Melting Point: -34 °C
Boiling Point: 67.5 °C at 760 mmHg
Flash Point: -8 °C
Solubility: decomposes in water
Appearance: water-white liquid
Hazard Symbols: HarmfulXn,FlammableF
Risk Codes: 11-21-23/25-36/37/38-10
Safety: 16-27-36/37/39-45-25-23-2
Transport Information: UN 2416 3/PG 2
PSA: 27.69000
LogP: -0.08950
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Chemistry

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

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)

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.

Safety Profile

Hazard Codes: HarmfulXn,FlammableF
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.)

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 .