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Diethylaminosulfur trifluoride (DAST) is the organosulfur compound with the formula Et 2 NSF 3. This liquid is a fluorinating reagent used for the synthesis of organofluorine compounds . [ 1 ] The compound is colourless; older samples assume an orange colour.
The mechanism of fluorination by DAST parallels that of sulfur tetrafluoride. Attack of the hydroxyl group of the substrate on sulfur and elimination of hydrogen fluoride lead to an alkoxyaminosulfur difluoride intermediate. Nucleophilic attack by fluoride, either by an S N 1 [5] or S N 2 [6] pathway, leads to the product. Although clean ...
Apart from DAST, a wide variety of similar reagents exist, including, but not limited to, 2-pyridinesulfonyl fluoride (PyFluor) and N-tosyl-4-chlorobenzenesulfonimidoyl fluoride (SulfoxFluor). [21] Many of these display improved properties such as better safety profile, higher thermodynamic stability, ease of handling, high enantioselectivity ...
DAST may refer to: Diethylaminosulfur trifluoride , an organosulfur compound Draw-a-Scientist Test , designed to investigate children's perceptions of the scientist
The formation of Fe(III)-EDTA (FeY) − can be described as follows: FeSO 4 ∙7H 2 O + K 2 H 2 Y + 1/4 O 2 → K[FeY(H 2 O)]. H 2 O + KHSO 4 + 5.5 H 2 O (1) [8]. Iron chelate has also been used as a bait in the chemical control of slugs, snails and slaters in agriculture in Australia and New Zealand.
This was demonstrated in the synthesis of meso-difluorosuccinate from (L)-tartrate and the synthesis of (D)- and (L)-difluorosuccinate from meso-tartrate. [6] Carbonyl compounds generally react with SF 4 to yield geminal difluorides. Reaction times tend to be on the order of hours and yields are moderate. [7]
Inorganic Syntheses is a book series which aims to publish "detailed and foolproof" procedures for the synthesis of inorganic compounds. [1] [2] Although this series of books are edited, they usually are referenced like a journal, without mentioning the names of the checkers (referees) or the editor.
Bottom-up approaches involve the chemical and biological synthesis of iron nanoparticles from metal precursors (e.g., Fe(II) and Fe(III)) [2]. This method is widely regarded as the most effective and commonly used strategy for nanoparticle preparation. [ 3 ]