Trimethyl borate

CAS Number: 121-43-7

Molecular Formula: C3H9BO3

About Trimethyl borate

Trimethyl Borate (CAS No. 121-43-7), also known as TMB, is a high-purity boron ester essential for the US pharmaceutical, electronics, and specialty chemical industries. It serves as the premier boron source for the synthesis of boronic acids and esters used in Suzuki-Miyaura cross-coupling reactions, as well as a crit...

Synonyms

boron trimethoxide
Borate de trimthyle
Tris(methoxy)borane
Boric acid trimethyl
ACMC-209aav

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Trimethyl borate Specifications

CAS Number

121-43-7

Molecular Formula

C3H9BO3

IUPAC Name

trimethyl borate

Canonical SMILES

B(OC)(OC)OC

InChI Key

WRECIMRULFAWHA-UHFFFAOYSA-N

InChI

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

CAS Number

121-43-7

Molecular Formula

C3H9BO3

IUPAC Name

trimethyl borate

Canonical SMILES

B(OC)(OC)OC

InChI Key

WRECIMRULFAWHA-UHFFFAOYSA-N

InChI

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

melting_point

-29.3 °C

boiling_point

67.5 °C

solubility

Miscible with tetrahydrofuran, ether, isoporpylamine, hexane, methanol, nujol, and other organic liquids

density

0.915 g/cu cm

logP

-1.9

Pharmaceutical & Life Sciences

In the United States pharmaceutical sector, Trimethyl Borate is used as a specialty reagent and intermediate in API development, medicinal chemistry, and boron-based drug research, supporting FDA-regulated formulation and validation programs.

Agrochemical & Crop Protection Industry

U.S. agrochemical manufacturers utilize Trimethyl Borate as a boron source and synthetic intermediate in the development of herbicides, fungicides, and plant nutrition formulations designed for EPA-compliant agricultural applications.

Polymer & Specialty Chemical Synthesis

Trimethyl Borate serves as an efficient catalyst and cross-linking agent in the production of specialty polymers and resins. It is used to modify the properties of polymers, improving their thermal stability and flame retardancy. Additionally, it is a key reagent in the synthesis of other boron-based specialty chemicals, including borohydrides and various boron-containing catalysts used in industrial chemical manufacturing.

Electronics, Semiconductors & Advanced Materials

In the American electronics and semiconductor industry, trimethyl borate is used in specialty glass, ceramic precursors, and dielectric materials where controlled boron incorporation is required for insulation, thermal stability, and device reliability.