Home Categories Chemical Reagents Trimethyl borate
A7666812

Trimethyl borate , ≥99.5%(GC), distillation purification , 121-43-7

Synonym(s):
Boric acid trimethyl ester;Methyl borate;Trimethyl borate

CAS NO.:121-43-7

Empirical Formula: C3H9BO3

Molecular Weight: 103.91

MDL number: MFCD00008346

EINECS: 204-468-9

Update time: 2022-07-08

PRODUCT 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.)
Flash point: 8 °F
storage temp.  Store at <= 20°C.
solubility  Miscible with tetrahydrofuran, ether, isoporpylamine, hexane and methanol.
form  Liquid
color  Colorless
Specific Gravity 0.915
Water Solubility  reacts
Sensitive  Moisture Sensitive
Hydrolytic Sensitivity 7: reacts slowly with moisture/water
Merck  14,9712
BRN  1697939
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)
Dielectric constant 8.2(20℃)
Stability: Stable. Incompatible with oxidizing agents. Decomposes slowly in the presence of moisture, rapidly in water. Flammable.
InChIKey WRECIMRULFAWHA-UHFFFAOYSA-N

Description and Uses

Trimethyl borate is a useful reagent in organic synthesis. It is involved in the production of resins, waxes and paints and acts as a methylation agent. As a boron source, it is used to prepare flame retardants, anti-oxidants and corrosion inhibitors. It reacts with Grignard reagents followed by hydrolysis to prepare boronic acid. It is also used as a precursor of borate esters, which finds application in the Suzuki coupling reaction. It is used as neutron detector gas in the presence of a scintillation counter; as a promoter of diborane reactions.

Safety

Symbol(GHS) 
GHS02,GHS06,GHS08
Signal word  Danger
Hazard statements  H225-H301+H311+H331-H319-H360FD-H370
Precautionary statements  P210-P280-P301+P310-P303+P361+P353-P304+P340+P311-P305+P351+P338
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
21
TSCA  Yes
HazardClass  3
PackingGroup  II
HS Code  29209085
Toxicity LD50 orally in rats: 6.14 ml/kg (Smyth)

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