Synonymer & Anagram | Engelska ordet TRIFLATE

Exempel på hur man kan använda TRIFLATE i en mening

• Due to the stability of sulfonate anions, the cations of sulfonate salts such as scandium triflate have application as Lewis acids.
• Commonly used catalysts for a Fischer esterification include sulfuric acid, p-toluenesulfonic acid, and Lewis acids such as scandium(III) triflate.
• A triflate group is an excellent leaving group used in certain organic reactions such as nucleophilic substitution, Suzuki couplings and Heck reactions.
• The hydroxyl group in 3 is esterified with triflic anhydride which adds a triflate protecting group.
• As an alternative to aluminium chloride, other Lewis acids such as boron trifluoride and bismuth triflate or strong protic acids such as hydrogen fluoride and methanesulfonic acid can also be used.
• An example of the scientific use of scandium triflate is the Mukaiyama aldol addition reaction between benzaldehyde and the silyl enol ether of cyclohexanone with an 81% yield.
• The reaction depicted in Scheme 2 illustrates the Povarov reaction with an imine and an enamine in the presence of yttrium triflate as the Lewis acid.
• The reaction is catalyzed by Lewis acids such as tin tetrachloride and scandium(III) triflate and Brønsted acids such as p-toluenesulfonic acid, perchloric acid, amberlite and iodine.
• In contrast, lanthanide triflates' complexes with the product are easily separated by water, and the lanthanide triflate hydrate thus formed can be simply heated to boil the water away (This does not work for aluminium chloride due to loss of HCl; same goes for the lanthanide chlorides, hence the necessity of the triflate counterion).
• Methyl triflate will alkylate many functional groups which are very poor nucleophiles such as aldehydes, amides, and nitriles.
• In place of the halide reagent pseudohalides can also be used, and the coupling has been shown to be quite effective using tosylate and triflate species in variety of conditions.
• Secondary alcohol at the anomeric carbon of 2,3,4,5-O-Benzyl-protected glucose reacted to form a glycosyl mesylate, which was found to be more stable than its triflate counterpart, in 2,4,6-collidine.
• Several forms of pyrvinium have been prepared with variable counter anions, such as halides, tosylate, triflate and pamoate.
• Consequently, the magnitude of KIEs indicated that the displacement of the triflate from 3 proceeded with the development of significant oxacarbenium ion character at the anomeric position.
• The leaving group X in the organic partner is usually a halide, although triflate, tosylate, pivalate esters, and other pseudohalides have been used.
• In the scheme shown, the E- and Z-vinyl triflates form after heterolytic carbon-iodine bond cleavage and subsequent trapping of the cation by triflate.
• A glyoxylate compound has been added to N,N-dimethylaniline with a chiral bisoxazoline ligand–copper(II) triflate catalyst system also in a Friedel–Crafts hydroxyalkylation:.
• Their reactivity generally mirrors that of the more commonly encountered triflate electrophiles, but nonaflates tend to be less prone to hydrolysis to ketones (in the case of alkenyl sulfonates) and phenols (in the case of aryl sulfonates).
• For example, formation of benzyne from 1 mole of 2-trimethylsilylphenyl trifluoromethanesulfonate (triflate) produces 1 mole of trimethylsilyl fluoride and 1 mole of triflate ion.
• methyl tosylate or triflates (in particular methyl triflate) and leads to the water-soluble poly(2-ethyl-2-oxazoline) which is a propionyl-substituted linear polyethylenimine and can also be seen as a pseudo-polypeptide.

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