Triethyl borate

Structural formula
General
Surname	Triethyl borate
other names	ortho -Borsäure triethyl Triethyl borate TEB
Molecular formula	C 6 H 15 BO 3
Brief description	colorless liquid with a faint ethanolic odor
External identifiers / databases
CAS number 150-46-9 EC number 205-760-9 ECHA InfoCard 100.005.238 PubChem 9009 Wikidata Q417816
properties
Molar mass	145.99 g mol −1
Physical state	liquid
density	0.86 g cm −3 (20 ° C)
Melting point	−85 ° C
boiling point	118 ° C
Vapor pressure	29 hPa (30 ° C)
solubility	decomposes in water
Refractive index	1.374 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 225 P: 210-233-260
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Boric acid triethyl ester ( triethyl borate ) is a chemical compound from the group of boric acid esters . It is the ethyl ester of boric acid .

presentation

Triethyl borate is formed by esterifying boric acid with ethanol in the presence of acidic catalysts :

${\displaystyle \mathrm {B(OH)_{3}+3\ C_{2}H_{5}OH\longrightarrow (C_{2}H_{5}O)_{3}B+3\ H_{2}O} }$

Alternatively, the compound can be obtained by reacting boron trichloride with ethanol:

${\displaystyle {\ce {BCl3 + 3 C2H5OH -> B(OC2H5)3 + 3 HCl}}}$

When the resulting solution ignites, the flame turns pale yellow, since the yield of the equilibrium reaction is low. The addition of sulfuric acid catalyzes the formation of esters, which causes the flame to turn green when the solution treated with it burns.

properties

Triethyl borate is a highly flammable, volatile, colorless liquid with a weak ethanolic odor. It decomposes in water and when burned, a green flame is created - similar to trimethyl borate . Triethyl borate has a kinematic viscosity of 0.503 mm ² / s.

use

Triethyl borate is used as a solvent and catalyst in the manufacture of paints and other chemical compounds (e.g. sodium borohydride ). It is also used as a starting product for the manufacture of flame retardants.

safety instructions

The vapors of triethyl borate can form an explosive mixture with air ( flash point 11 ° C).

Web links

• Entry on triethyl borate in the Spectral Database for Organic Compounds (SDBS) of the National Institute of Advanced Industrial Science and Technology (AIST)

Individual evidence

1. ↑ ^{a b c d e f g h i j} Entry for CAS no. 150-46-9 in the GESTIS substance database of the IFA , accessed on July 24, 2013(JavaScript required) .
2. ↑ Triethyl borate data sheet from Sigma-Aldrich , accessed on April 24, 2011 ( PDF ).
3. ^ SV Urs et al .: Ethyl orthoborate . In: Therald Moeller (Ed.): Inorganic Syntheses . tape 5 . McGraw-Hill, Inc., 1957, pp. 29-31 (English).
4. ^ Preben Hartmann-Petersen, Graeme Gerrans, Rasmus Hartmann-Petersen: Sasol Encyclopaedia of Science and Technology . 2nd Edition. New Africa Books, Claremont 2004, ISBN 978-1-86928-384-1 , pp. 28 ( limited preview in Google Book search).
5. ↑ Triethylborate data sheet (PDF) from Merck , accessed on March 27, 2010.