Trimethoxyboroxine

Structural formula
General
Surname	Trimethoxyboroxine
Molecular formula	C 3 H 9 B 3 O 6
Brief description	colorless liquid
External identifiers / databases
CAS number 102-24-9 EC number 203-016-8 ECHA InfoCard 100.002.743 PubChem 66880 Wikidata Q55524855
properties
Molar mass	173.53 g mol −1
Physical state	liquid
density	1.195 g cm −3 (25 ° C)
Melting point	10 ° C
boiling point	130 ° C
Vapor pressure	40 hPa (25 ° C)
solubility	reacts with water
Refractive index	1.4 (20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 225-314 P: 210-280-303 + 361 + 353-304 + 340 + 310-305 + 351 + 338-403 + 235
Toxicological data	5160 mg kg −1 ( LD 50 ,  rat ,  oral )
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

Trimethoxyboroxine is a chemical compound from the boroxine group .

Extraction and presentation

Trimethoxyboroxine can be obtained by reacting boron trioxide with boric acid trimethyl ester .

${\displaystyle {\ce {B2O3 + B(OCH3)3 -> (BOCH3O)3}}}$

In this way, the compound was first synthesized in 1951 by Goubeau and Keller. The compound can also be prepared by reacting boron trioxide with a mixture of trimethyl borate and methanol.

properties

Trimethoxyboroxine is a colorless liquid that reacts with water.

use

Trimethoxyboroxine can be used as an intermediate in the manufacture of other chemical compounds (for example dimethoxyborane ). It is also used as a fire extinguishing substance on burning metals.

Individual evidence

1. ↑ ^{a b c d e f g h i j k} data sheet trimethoxyboroxine, 95% from Sigma-Aldrich , accessed on March 17, 2018 ( PDF ).
2. ↑ ^{a b c} data sheet Trimethoxyboroxine from AlfaAesar, accessed on March 17, 2018 ( PDF )(JavaScript required) .
3. ↑ Leopold Gmelin: Boron Compounds: Boron-Oxygen Compounds 1 . Springer-Verlag, 1977, ISBN 3-540-93339-5 , pp. 156 ( limited preview in Google Book search).
4. ↑ Google Patents: US2927124A - Preparation of trimethoxyboroxine - Google Patents , accessed March 17, 2018.
5. ↑ VK Jain: Fire Safety In Buildings . Taylor & Francis, 2007, ISBN 978-81-224-1035-8 , pp. 323 ( limited preview in Google Book search).