Diethyl phosphite

Structural formula
General
Surname	Diethyl phosphite
other names	Diethyl phosphonate;
Molecular formula	C 4 H 11 O 3 P
Brief description	colorless liquid
External identifiers / databases
EC number	212-091-6
ECHA InfoCard	100.010.992
PubChem	3780918
Wikidata	Q63409686
properties
Molar mass	138.10 g mol −1
Physical state	liquid
density	1.072 g cm −3 (25 ° C)
Melting point	-70 ° C
boiling point	50–51 ° C at 3 hPa ; 188 ° C;
Vapor pressure	<3 hPa (20 ° C)
solubility	rapidly decomposes in water with hydrolysis
Refractive index	1.407 (20 ° C)
safety instructions
H and P phrases	H: 317-318
	P: 261-280-302 + 352-305 + 351 + 338
Toxicological data	3900 mg kg −1 ( LD 50 , rat , oral ) ; 2170 mg kg −1 ( LD 50 , rabbit , transdermal ) ;
	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

Diethyl phosphite is a chemical compound from the group of phosphorous acid esters . It is a colorless liquid that decomposes in water or when heated above 270 ° C.

Extraction and presentation

Diethyl phosphite can be obtained by reacting ethanol with phosphorus trichloride :

{\ displaystyle {\ ce {3 C2H5OH + PCl3 -> (C2H5O) 2POH + C2H5Cl + 2 HCl}}}

properties

Diethyl phosphite forms flammable vapor-air mixtures at higher temperatures. The compound has a flash point of 74 ° C. The explosion range is between 3.8% by volume as the lower explosion limit (LEL) and 12.8% by volume as the upper explosion limit (UEL). The ignition temperature is 230 ° C. The substance therefore falls into temperature class T3.

use

Diethyl phosphite is used as a solvent for paints, as a lubricant additive , antioxidant , reducing and phosphorylating agent.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m entry on diethyl phosphite in the GESTIS substance database of the IFA , accessed on March 22, 2020(JavaScript required) .
↑ ^a ^b ^c data sheet diethyl phosphite, 98% from Sigma-Aldrich , accessed on May 28, 2014 ( PDF ).
↑ ^a ^b ^c Entry on diethyl phosphite. In: Römpp Online . Georg Thieme Verlag, accessed on May 28, 2014.
↑ JE Malowan: phosphite Diethyl . In: JC Bailar, Jr. (Ed.): Inorganic Syntheses . tape 4 . McGraw-Hill, Inc., 1953, pp. 58-60 (English).

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m entry on diethyl phosphite in the GESTIS substance database of the IFA , accessed on March 22, 2020(JavaScript required) .

[Sigma-2] ta sheet diethyl phosphite, 98% from Sigma-Aldrich , accessed on May 28, 2014 ( PDF ).

[roempp-3] Entry on diethyl phosphite. In: Römpp Online . Georg Thieme Verlag, accessed on May 28, 2014.

[IS4-4] JE Malowan: phosphite Diethyl . In: JC Bailar, Jr. (Ed.): Inorganic Syntheses . tape 4 . McGraw-Hill, Inc., 1953, pp. 58-60 (English).