Zinc trifluoromethanesulfonate

Zinc trifluoromethanesulfonate, Zn(OTf)2- The salt is prepared by reaction of zinc carbonate in CH,OH with triflic acid at 23° reflux (98% yield). Supplier Fluka. 

Zinc trifluoromethanesulfonate [54010-75-2] M 363.5, m >300. It should be dried at 125° for 2hours at 3mm before use. It is soluble in CH2CI2 but insoluble in pet ether. [Corey Shimoji Tetrahedron... 

Preparative Methods dried zinc trifluoromethanesulfonate is heated with PCl5-2ZnCl at 260 °C. Fractional distillation of the volatile products gives TfCl (94% yield). ... 

As catalysts for the Fries rearrangement reaction are for example used aluminum halides, zinc chloride, titanium tetrachloride, boron trifluoride and trifluoromethanesulfonic acid7... 

Vahrenkamp and co-workers formed a number of chelate-stabilized ketone complexes with pyridylphenyl ketone. Octahedral complexes formed with a 2 1 ratio of ligand to zinc were formed with trifluoromethanesulfonate, chloride, and bromide anions. 1 1 reactions resulted in the formation of square pyramidal [ZnL2X]+ with X = Br, I, and a trigonal-bipyramidal dimer [L2Zn(NCS)2]2 with thiocyanate bridges.350... 

Methylacridinium-9-carboxylic ester trifluoromethanesulfonate (100 mg) was dissolved in dichloromethane (100 mL). To this solution perchloric acid (20 drops) and zinc powder (6 g) were added. The mixture was placed in an ultrasonic bath for 3 h and filtered. The solution was washed with water (1 x) and hydrochloric acid (2X, 0.1 M), dried over MgS04, and concentrated. 

Asymmetric introduction of azide to the a-position of a carbonyl has been achieved by several methods. These include amine to azide conversion by diazo transfer,2 chiral enolate azidation,3 and displacement of optically active trifluoromethanesulfonates,4 p-nitrobenzenesulfonates,5 or halides.6 Alkyl 2-azidopropionates have been prepared in optically active form by diazo transfer,2 p-nitrobenzenesulfonate displacement,5 and the Mitsunobu displacement using zinc azide.7 The method presented here is the simplest of the displacement methods since alcohol activation and displacement steps occur in the same operation. In cases where the a-hydroxy esters are available, this would be the simplest method to introduce azide. 

Interestingly, salts other than tin(ll) bis-(2-ethylhexanoate) such as scandium and tin trifluoromethanesulfonate [41 3], zinc octoate [44, 45], and aluminum acetyl acetonate [45] were reported to mediate the ROP of lactones. As far as scandium trifluoromethanesulfonate is concerned, the main advantage is the increase of its Lewis acidity enabling the polymerization to be carried out at low temperatures with acceptable kinetics. Later, faster kinetics were obtained by extending the process to scandium trifluoromethanesulfonimide [Sc(NTf2)3] and scandium nonafluorobutanesulfonimide [Sc(NNf2)3] and to other rare earth metal catalysts (metal=Tm, Sm, Nd) [46]. 

Aminosulfides, important building blocks for the synthesis of various bioactive molecules, can be prepared by the thiolysis of aziridines in the presence of Bi(OTf)3 (5 mol%) [36]. Even though Lewis acids such as boron trifluoride etherate and zinc chloride, as well as Bronsted acids such as trifluoromethanesulfonic acid, have been employed as acid catalysts, these methods suffer from disadvantages like the use of stoichiometric amount of catalysts [37—40], harsh conditions, the use of large excess of thiols and necessitate anhydrous conditions to produce the desired products. Furthermore, these reagents cannot be recovered and recycled because they decompose or deactivate under quenching conditions. 

Tin(II) chloride-Aluminum, 299 Tin(II) trifluoromethanesulfonate, 301 Zinc-copper couple, 348... 

Phosphomolybdic acid-Potassium di-chromate-Copper(II) sulfate, 248 Tin(II) trifluoromethanesulfonate, 301 Other unsaturated carbonyl compounds Lead tetraacetate, 155 Pyrylium perchlorate, 263 Zinc-copper couple, 348 a-Substituted-a, p-unsaturated carbonyl compounds... 

ALKENES l,l -Bis(diphenylphos-phino)ferrocene. Sodium pyridylsele-nate. Tri-n-butyltin hydride. Trimethyl-silylmethyllithium. Trimethylsilylmethyl trifluoromethanesulfonate. Zinc. 

A potentially useful new synthetic route to the aporphines involves reducti of a properly substituted nitrotetrahydrobenzyllsoquinollne with zinc in a mixture of trifluoroacetic acid and trifluoromethanesulfonic acid. In this... 

The aqua osmium(II) complex is prepared by reduction of the aqua osmium(III) complex (prepared as in Section E). Aqua(2,2 -bipyridine-A, A )(2,2 6, 2"-ter-pyridine-yV,A, iV")osmium(III) trifluoromethanesulfonate dihydrate (0.5(X) g, 4.063 mmol) is dissolved in 0.33 M CF3SO3H (30 mL), and the solution is filtered. Two pieces of freshly prepared zinc amalgam are added. The solution is stirred for 5 hr. The zinc is removed, and the solution is cooled in an ice bath. The resulting black crystals are filtered off, washed with ice cold water (2x2 mL), and dried under vacuum. Yield 0.224 g (53%). A second crop may be obtained by addition of fresh zinc amalgam to the filtrate. 

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