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Diethylaminosulfur trifluoride

Diethylaminosulfur trifluoride95%


Product name: Diethylaminosulfur trifluoride

IUPAC name: N, N-Diethylaminosulfur trifluoride 

Other name: Diethyl(trifluorosulfido)amine

Abbreviations: DAST

CAS NO.: 38078-09-0


Chemical Properties

Formula: C4H10F3NS

Formula Weight: 161.19

Boiling point: 30-32°C/3 mm

Flash point: 23°C(75°F)

Density: 1.22g/mL (25°C)

Refractive index: 1.41-1.416

Storage & Sensitivity: Store 2-8ºC (recommended) under Nitrogen.

Solubility: Miscible with water, ethanol, benzene and acetonitrile.

Water solubility: Reacts with water
Appearance: Colorless Liquid

Capacity: 8T / year, regular stock products, all year round

Package: 1kg, 5kg, 25kg



A fluorinating agent for alcohol, aldehyde and Ketone, anti-cancer drug

Diethylaminosulfur trifluoride (DAST) is used as a precursor to prepare 2,6-dimethoxybenzoyl fluoride and 2-thiazolines. It is a useful fluorinating agent used for a variety of compounds including alcohols, thioethers, alkenols and cyanohydrins. It also serves as a catalyst for Friedel-Crafts allylation reaction using tertiary cyclopropyl silyl ethers and in the rearrangement of homoallylic alcohols to unsaturated aldehydes. It plays an important role for gem difluorination of ketopipecolinic acids. 


Store in cool place. Moisture sensitive. It reacts with water and ethanol. Incompatible with water, acids and bases.



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