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452920

Sigma-Aldrich

Trimethyl borate

≥98%

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Synonym(s):
Boric acid trimethyl ester, Methyl borate
Linear Formula:
B(OCH3)3
CAS Number:
Molecular Weight:
103.91
Beilstein:
1697939
EC Number:
MDL number:
PubChem Substance ID:

vapor density

3.59 (vs air)

Quality Level

Assay

≥98%

refractive index

n20/D 1.346 (lit.)

bp

68-69 °C (lit.)

mp

−34 °C (lit.)

density

0.932 g/mL at 20 °C (lit.)

SMILES string

COB(OC)OC

InChI

1S/C3H9BO3/c1-5-4(6-2)7-3/h1-3H3

InChI key

WRECIMRULFAWHA-UHFFFAOYSA-N

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Application

Trimethyl borate reacts with a Grignard reagent or organolithium compounds to yield dimethyl boronates, which upon subsequent aqueous acid treatment afford corresponding boronic acids. The resultant boronic acids or esters are useful intermediates in various cross-coupling reactions such as Suzuki coupling and Chan-Lam coupling. It is also used in the preparation of sodium borohydride.

Legal Information

ASCENSUS product

Signal Word

Danger

Hazard Classifications

Acute Tox. 3 Dermal - Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Eye Irrit. 2 - Flam. Liq. 2 - Repr. 1B - STOT SE 1

Target Organs

Eyes

Storage Class Code

3 - Flammable liquids

WGK

WGK 1

Flash Point(F)

12.2 °F - (own results)

Flash Point(C)

-11 °C - (own results)

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Information

危险化学品

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The Preparation of Sodium Borohydride by the High Temperature Reaction of Sodium Hydride with Borate Esters1.
Schlesinger H I, et al.
Journal of the American Chemical Society, 75(1), 205-209 (1953)
Cross?Coupling Reactions Of Organoboranes: An Easy Way To Construct C-C Bonds (Nobel Lecture)
Suzuki A
Angewandte Chemie (International Edition in English), 50(30), 6722-6737 (2011)
Palladium-catalyzed cross-coupling reactions of organoboron compounds.
Miyaura N and Suzuki A
Chemical Reviews, 95(7), 2457-2483 (1995)
New N-and O-arylations with phenylboronic acids and cupric acetate.
Chan D M, et al.
Tetrahedron Letters, 39(19), 2933-2936 (1998)
Boronic esters in stereodirected synthesis.
Matteson D S
Tetrahedron, 45(7), 1859-1885 (1989)

Related Content

Our laboratory is interested in the development of new synthetic methodology and its application to the synthesis of potentially useful molecules. Our research work is spread across a wide range of different areas including transition-metal catalysis (gold, palladium), organoboron chemistry, organocatalysis, multicomponent reactions, and sustainable chemistry.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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