My watch list  

Trimethyl borate

Trimethyl borate
CAS number 121-43-7
Molecular formula C3H9BO3
Molar mass 103.91 g mol-1
Appearance clear liquid
Density 0.915 g/ml
Melting point


Boiling point

68-69 °C, 341-342 K, 154-156 °F

Solubility in water decomposes
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Trimethyl borate, or boron trimethoxide, has formula B(OCH3)3. It is a clear liquid. It melts at −34 °C and boils at 68-69 °C. It decomposes in contact with water. It is flammable and burns with a green flame.

It 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. Wood preservative
  3. Catalyst of olefin polymerisation
  4. raw material in the production of borophosphosilicate glass film by chemical vapor deposition
  5. raw material in the production of specialty glasses using sol-gel technology
  6. solvent or catalyst for resins, waxes, paints, and varnishes
  7. component of some flame retardants in textile industry
  8. component of some welding fluxes
  9. in green fire compositions for special effects (as a solution of boric acid in methanol, where it forms in small amounts)[1]


  1. ^
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trimethyl_borate". A list of authors is available in Wikipedia.
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE