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Trimethyl Borate CAS 121-43-7

Trimethyl borate is an organoboron compound with the chemical formula B(OCH₃)₃. It appears as a colorless liquid with a pungent, sweet, ester-like odor. Reacts with water (hydrolyzes), but soluble in organic solvents such as methanol, ethanol, diethyl ether, and tetrahydrofuran. Commonly used as a reagent in organic synthesis for the preparation of boronic esters and as a source of boric acid in various chemical reactions. Also functions as a flame retardant additive, a crosslinking agent in polymer and resin formulations, and as a precursor for the chemical vapor deposition of boron-containing films. Highly moisture-sensitive; should be stored in tightly sealed containers away from water and humidity.


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Model:
121-43-7
Brand:
Boss Chemical
Code:
121-43-7

Product Description

Trimethyl borate Basic information
Product Name:	Trimethyl borate
CAS:	121-43-7
MF:	C3H9BO3
MW:	103.91
EINECS:	204-468-9
Mol File:	121-43-7.mol
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)
vapor pressure	147.9-148 hPa ( 20 °C)
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	149,712
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.
InChI	1S/C3H9BO3/c1-5-4(6-2)7-3/h1-3H3
InChIKey	WRECIMRULFAWHA-UHFFFAOYSA-N
SMILES	COB(OC)OC
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)