DAST(Diethylaminosulfur Trifluoride) Other Names: N,N-Diethylaminosulfur trifluoride (Diethylamino)sulfur trifluoride Diethyl(trifluorosulfido)amine Structure: ![](https://commonorganicchemistry.com/Common_Reagents/Diethylaminosulfur_Trifluoride/DAST.png)
CAS Number: 38078-09-0 Molecular Weight: 161.19 g/mol Appearance: Colorless oil Boiling Point: 30-32 C at 3 mmHg Density: 1.22 g/mL Diethylaminosulfur trifluoride (DAST) is a nucleophilic fluorinating agent with wide use in organic chemistry. Deoxo-Fluor is more thermally stable alternative to DAST. ![](https://commonorganicchemistry.com/Common_Reagents/Diethylaminosulfur_Trifluoride/DAST_Ex_01.png)
![](https://commonorganicchemistry.com/Common_Reagents/Diethylaminosulfur_Trifluoride/DAST_Ex_02.png)
![](https://commonorganicchemistry.com/Common_Reagents/Diethylaminosulfur_Trifluoride/DAST_Ex_03.png)
Deoxo-Fluor[Bis(2-methoxyethyl)aminosulfur Trifluoride] Structure: ![](https://commonorganicchemistry.com/Common_Reagents/Bis(2-methoxyethyl)aminosulfur_Trifluoride/Deoxo-Fluor.png)
CAS Number: 202289-38-1 Molecular Weight: 221.24 g/mol Appearance: Clear yellow liquid Density: 1.2 g/mL Deoxo-Fluor is a nucleophilic fluorinating agent with wide use in organic chemistry. Deoxo-Fluor is more thermally stable than Diethylaminosulfur Trifluoride (DAST). ![](https://commonorganicchemistry.com/Common_Reagents/Bis(2-methoxyethyl)aminosulfur_Trifluoride/Bis(2-methoxyethyl)aminosulfur_Trifluoride_Ex_01.png)
![](https://commonorganicchemistry.com/Common_Reagents/Bis(2-methoxyethyl)aminosulfur_Trifluoride/Bis(2-methoxyethyl)aminosulfur_Trifluoride_Ex_02.png)
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