Fluorinating reagents Preparation Reactions Precautions
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Diethylaminosulfur trifluoride

Fluorinating reagents Preparation Reactions Precautions
Product Name
Diethylaminosulfur trifluoride
CAS No.
38078-09-0
Chemical Name
Diethylaminosulfur trifluoride
Synonyms
DAST;ET2NSF3;DIETHYLAMINOSULPHUR TRIFLUORIDE;(diethylamino)trifluorosulfur;Diethylamine sulfur trifluoride;amino)suL;fur trifL;(beta-4)-sulfu;(T-4)-(N-ethyl;Oleamide 301-02-0
CBNumber
CB5153161
Molecular Formula
C4H10F3NS
Formula Weight
161.19
MOL File
38078-09-0.mol
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Diethylaminosulfur trifluoride Property

Boiling point:
30-32 °C3 mm Hg(lit.)
Density 
1.22 g/mL at 25 °C(lit.)
refractive index 
1.41-1.416
Flash point:
75 °F
storage temp. 
2-8°C
solubility 
Benzene, Chloroform (Slightly)
pka
-4.87±0.70(Predicted)
form 
liquid
Specific Gravity
1.220
color 
Colorless to Yellow to Orange
Water Solubility 
decomposes
Sensitive 
Moisture Sensitive
Merck 
14,3113
BRN 
1849066
Exposure limits
ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3
Stability:
Reacts with Moisture in the Air, Reacts With Moisture In The Air, Unstable in So
InChIKey
CSJLBAMHHLJAAS-UHFFFAOYSA-N
CAS DataBase Reference
38078-09-0(CAS DataBase Reference)
NIST Chemistry Reference
Diethylaminosulfur trifluoride(38078-09-0)
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Safety

Hazard Codes 
C,T,F
Risk Statements 
10-14-20/21/22-34-5-35-40
Safety Statements 
16-26-36/37/39-45
RIDADR 
UN 2920 8/PG 1
WGK Germany 
3
3-10-21
Hazard Note 
Corrosive/Keep Cold
HazardClass 
8
PackingGroup 
I
HS Code 
29309070
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H226Flammable liquid and vapour

H242Heating may cause a fire

H314Causes severe skin burns and eye damage

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P370+P378In case of fire: Use … for extinction.

P403+P235Store in a well-ventilated place. Keep cool.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
235253
Product name
(Diethylamino)sulfur trifluoride
Packaging
1g
Price
$44.5
Updated
2024/03/01
Sigma-Aldrich
Product number
235253
Product name
(Diethylamino)sulfur trifluoride
Packaging
5g
Price
$104
Updated
2024/03/01
TCI Chemical
Product number
D1868
Product name
(Diethylamino)sulfur Trifluoride [Fluorinating Reagent]
Purity
>90.0%(T)
Packaging
5g
Price
$102
Updated
2024/03/01
TCI Chemical
Product number
D1868
Product name
(Diethylamino)sulfur Trifluoride [Fluorinating Reagent]
Purity
>90.0%(T)
Packaging
25g
Price
$323
Updated
2024/03/01
Alfa Aesar
Product number
A11992
Product name
Diethylaminosulfur trifluoride, 95%
Packaging
5g
Price
$108
Updated
2024/03/01
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Diethylaminosulfur trifluoride Chemical Properties,Usage,Production

Fluorinating reagents

N,N-Diethylaminosulfur trifluoride (DAST) is the most widely used fluorinating reagent in this class. It has a similar reactivity to sulfur tetrafluoride, but has the advantage that it can be used in glass vessels at atmospheric pressure. Deoxofluorination reactions with N,N-diethylaminosulfur trifluoride are usually run neat or in anhydrous aprotic solvents, most frequently halogenated solvents, at temperatures of 0- 80 °C. Typically, a stoichiometric amount of the reagent is used for aldehydes and a small excess is used for ketones.

Diethylaminosulfur trifluoride is the most widely used member of this family of reagents, is a pale yellow liquid that reacts violently with water. DAST is readily obtained from commercial sources (e.g. Aldrich or Lancaster) and can also be prepared by the reaction of N,N-di-ethylaminotrimethylsilane with sulfur tetrafluoride, followed by distillation of the crude product under reduced pressure. DAST is known to be thermally unstable, undergoing either explosion or detonation when heated to > 9°ºC.

Preparation

This preparation of diethylaminosulfur trifluoride is an adaptation of a procedure first described by von Halasz and Glemser.The same procedure can also be used to prepare other dialkylaminosulfur trifluorides by the substitution of the diethylaminotrimethylsilane with other dialkylaminotrimethylsilanes.

A solution of 96 g (0.66 mole) of diethylaminotrimethylsilane in 100 ml trichlorofluoromethane was added dropwise to a solution of 40 ml (measured at -78°, 0.72 mole) of sulfur tetrafluoride in 200 ml of trichlorofluoromethane at -65° to -60°. The reaction mixture was warmed to room temperature and then distilled to give 88.86 g (84% yield) of diethylaminosulfur trifluoride as a pale yellow liquid, bp 46°-47° (10 mm).

Reactions

Diethylaminosulfur trifluoride (DAST) has proven itself to be an extremely popular reagent for nucleophilic fluorination, due to its ease of handling and versatility. It has regularly been employed in a myriad selective fluorinations of alcohols, alkenols, carbohydrates, ketones, sulfides, epoxides, thioethers, and cyanohydrins. In addition some novel organic cyclizations are possible when DAST is employed as a reagent.
Fluorodeoxygenation was achieved using DAST in a preparatively simple synthesis of 5,5-difluoropipecolic acid from glutamic acid.

1,2,2-Trifluorostyrenes can be synthesized using a sequential reaction on the parent a-(trifluoromethyl)phenylethanol with DAST, followed by dehydrohalogenation with lithium bis(trimethylsilyl)amide (LHMDS). This method achieves the trifluorostyrene without requirement of palladium coupling.

DAST was recently used to obtain fluorinated analogues of 3,6-dibromocarbazole piperazine derivatives of 2-propanol (Scheme 7). A series of these analogues are described as the first small and potent modulators of the cytochrome c release triggered by Bid-induced Bax activation in a mitochondrial assay.

Precautions

diethylaminosulfur trifluoride (DAST) reacts violently with water, it is volatile, and is reported to be explosive when heated owing to its calorimetry profile and its rapid dismutation to SF4 and (Et2N)2SF2. Furthermore, its decomposition products are themselves highly reactive and will etch laboratory glassware. Accordingly, DAST must be used with extreme caution, and samples are recommended not to be heated above 90 °C.

Chemical Properties

Pale yellow liquid. Soluble in most non-polar organic solvents, commonly used in CH2Cl2, CHCl3 and CCl4.

Uses

Diethylaminosulfur Trifluoride is a very useful Nucleophilic fluorinating agent in chemical synthesis. It is also used as a reagent in the preparation of 2-thiazolines from (1,2)-thioam ido-alcohols.

Application

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.

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View Lastest Price from Diethylaminosulfur trifluoride manufacturers

WUHAN FORTUNA CHEMICAL CO., LTD
Product
Diethylaminosulfur trifluoride 38078-09-0
Price
US $0.00/KG
Min. Order
1KG
Purity
98%min
Supply Ability
30tons/month
Release date
2023-02-22
Hebei Weibang Biotechnology Co., Ltd
Product
Diethylaminosulfur trifluoride 38078-09-0
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
500000kg
Release date
2024-10-25
Hebei Yanxi Chemical Co., Ltd.
Product
Diethylaminosulfur trifluoride 38078-09-0
Price
US $80.00-50.00/kgkg
Min. Order
1kgkg
Purity
0.99
Supply Ability
1000
Release date
2023-10-08

38078-09-0, Diethylaminosulfur trifluorideRelated Search:


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