Diethyl fluormalonate

C₇H₁₁FO₄

CAS NO.685-88-1

Diethyl fluoromalonate CAS No685-88-1

Application

Method of Tetrafluoropropionitrile Alcoholysis
A 1L three-neck reaction bottle with a thermometer, gas input, and condenser should be filled with 200mL of 1,4-dioxane and 500g of 25% concentrated ammonia water (7.35mol). The bottle should be vented within five hours. Add 291g (1.94mol) of hexafluoropropylene and keep the temperature between -5°C and 0°C. Following a three-hour reaction, 187g of 2,3,3,3-tetrafluoropropionitrile with a 76% yield (boiling point of 40°C) was obtained by extracting the separated oil phase with ethylbenzene, washing it with water, drying it over anhydrous magnesium sulfate, and then distilling it.Furthermore, diethyl bromomalonate.Add 2,3,3,3-tetrafluoropropionitrile (127g, 1.0mol) dropwise at a temperature lower than 10°C to a solution of sodium ethoxide (190g, 3.5mol) in ethanol (800mL). To obtain 2-fluoromalonedioic acid, remove the oil layer using diethyl ether, neutralize with sodium bicarbonate aqueous solution, wash with saturated sodium chloride solution, dry with anhydrous magnesium sulfate, and distill under reduced pressure after heating to room temperature and reacting for 30 minutes with a strong salt acidifier. 92% yield from 138g of ethyl ester.

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Method of synthesis: 1. Diethyl difluoromalonate is made from ethanol

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2. Diethyl difluoromalonate is synthesized using diethyl bromomalonate and acetamide.

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Physical Properties

Assay	≥98%
Boiling point	121-122 ℃30 mm Hg(lit.)
Density	1.129 g/mL at 25 °C(lit.)
Molecular mass	178.16
Refractive index	1.4032
Flash point	111-112℃/45mm
Package	25kgs or according customer requirement
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Packing, Storage, Handling and Transportation

Diethyl fluoropropionate should be stored under inert gas (nitrogen or argon) at 2-8 ℃.

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