Triethyl phosphite

Phosphite

Colorless, foul-smelling fluid

Liquid

0.97 g · cm -3

-112 ° C

156 ° C.

4 hPa ( 20 ° C)

• Miscible with organic solvents
• Insoluble in water ( hydrolysis)

1.4127 (20 ° C)

Attention

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Triethyl phosphite is the triethyl ester of phosphorous acid.

Representation and extraction

Triethyl phosphite can be prepared by the reaction of phosphorus trichloride with ethanol.

Properties

Triethyl phosphite is a colorless, characteristic smelling liquid. The boiling point is at a pressure of 1013 hPa at 158 ° C under a reduced pressure of 19 hPa at 54 ° C. The vapor pressure function is given by Antoine corresponding log10 (P) = A- ( B / ( T C)) (P in Torr, T in ° C ) with A = 7.2, B = 1683 and C = 230 in the temperature range of 20 ° C to 156 ° C. The compound forms above the flash point flammable vapor - air mixtures. The compound has a flash point of 44 ° C. The explosion range is between 3.75 vol % for the lower explosive limit ( LEL) and 42.5 vol% as the upper explosive limit ( UEL). The ignition temperature is 250 ° C. The fabric falls within the temperature class T3.

Use

In the industrial production of the insecticide chlorfenvinphos triethyl phosphite is used as the starting material. In organic chemistry it is often used for the synthesis of olefins, alkynes, and Dehydrodimeren of nitrogen heterocycles of aromatic nitro compounds. About the Michaelis- Arbuzov reaction can be phosphonates on the Perkow reaction produce vinyl phosphates. In the preparation of alkenes from 1,2- diols in accordance with the Corey - Winter reaction of triethyl phosphite is used as desulfurierendes reagent. In organometallic compounds and metal complexes can be used as a ligand. Such compounds are, for example, as isomerization catalysts.