Boric acid, triethyl ester
3D model (JSmol)
|Molar mass||145.99 g·mol−1|
|Melting point||−85 °C (−121 °F; 188 K)|
|Boiling point||118 °C (244 °F; 391 K)|
|Flash point||11 °C (52 °F; 284 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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It melts at −85 °C and boils at 118 °C. It is flammable, with flash point at 11 °C. It is a weak Lewis acid (AN = 17, Gutmann-Beckett method). . It burns with a green flame and solutions of it in ethanol are therefore used in special effects and pyrotechnics.
- B(OH)3 + 3 C2H5OH ⇌ (C2H5O)3B + 3 H2O
In order to increase the rate of forward reaction, the formed water must be removed from reaction media by either azeotropic distillation or adsorption. It is used as a solvent and/or catalyst in preparation of synthetic waxes, resins, paints, and varnishes. It is used as a component of some flame retardants in textile industry and of some welding fluxes.
- M.A. Beckett, G.C. Strickland, J.R. Holland, and K.S. Varma, "A convenient NMR method for the measurement of Lewis acidity at boron centres: correlation of reaction rates of Lewis acid initiated epoxide polymerizations with Lewis acidity", Polymer, 1996, 37, 4629–4631. doi: 10.1016/0032-3861(96)00323-0