Titanium difluoride

Titanium Diffuoride. Unlike other titanium dihalides, titanium difluoride [13814-20-5] is known only from mass spectra of gases. 

The enantioselective hydrosilylation of 2-pentylcyclopentenone is effected with PMHS and an active catalyst derived from (R.R)-ethylenebis(tetrahydro-indenyl)titanium difluoride and phenylsilane (EBTHI)Ti (Eq. 3 50).587 The use of diphenylsilane, a rhodium catalyst, and (W, / )-(. ,.S )-BuTRAP as the chiral ligand gives similar results.576 Other related approaches give greatly inferior enantioselectivies, 592 594... 

Titanium dibromide, 25 54 Titanium dichloride, 25 49 Titanium difluoride, 25 47 Titanium diiodide, 25 54-55 Titanium dioxide, 5 583, 25 1, 2, 15-23. See also Ti02 entries Titanium oxide entries... 

Miscellaneous.—Hydridofluorophosphates have been prepared for the first time, and the anion (129) has been found to have an octahedral structure, with hydrogens trans.116 Phosphorus pentafluoride forms an adduct with biscyclopentadienyl titanium difluoride.116 The phosphorane (130) has been prepared as shown.117... 

Highly enantioselective hydrosilylation of the imine 144 was achieved using (S,S)-(ebthi)titanium difluoride as a catalyst precursor to give the optically active benzylamine 145 with 99% ee in 95% after acidic workup [85],... 

The combination of titanium(IV) fluoride with antimony(lll) fluoride was found to open the epoxide ring regioselectively to yield the more-substituted fluoride, but only one example with a moderate yield was given. In another case, it was reported that regioselective epoxide cleavage could be best achieved with bis(isopropoxy)titanium difluoride. 

Th02 THORIUM DIOXIDE 1657 TiOF2[g] TITANIUM DIFLUORIDE OXIDE (GAS) 1700... 

A catalytically active chiral hydridotitanium complex obtained from (5,5j-ethylene(T -tetrahydroindenyl)titanium difluoride and PhSiHj hydrosilylates imines under mild conditions with significantly higher substrate catalyst ratios than known methods yield. ... 

Both (RJi) and (S,S) enantiomers of ethylenebis(rf-tetrahydroindenyl)titanium difluoride (EBTHI)TiF2, were developed by Buchwald et al. and used in many efficient enantioselective hydrogenations of ketones [15] and imines [16]. The utility of this process was demonstrated in the enantio- and diastereo-selective preparation of sertraline according to Scheme 7.2. The enantioselectivity and yield in this reaction ranged between 90 and 96% e.e. and 40-50%, respectively. The yield is based on the racemic 5, and amounts to 76-96% when based on the (4S)-enantiomer. Workup in this reaction requires chromatographic separation of (15,45 )-1, from the (4i )-ketone 4. Later, in Sect. 7.5.4, we shall discuss an independent research project that resulted in the efficient recycling of the wrong enantiomer of this ketone. 

Alkylated (R,RHetrahydroindcnyItitanium difluoride and phenylsilane serve to asymmetrically reduce a variety of ketones, especially aryl alkyl ketones, in excellent chemical yields and >96% ee.587 The use of the easier to handle and less expensive PMHS is also highly effective in these transformations. In a related study using the (W, W)-tctrahydroindcny I titanium l,T-binaphth-2,2/-diolate precursor to the active catalyst, similarly impressive results are obtained.588... 

Kroll process, 13 84-85 15 337 17 140 in titanium manufacture, 24 851-853 Kroll zirconium reduction process, 26 631 KRW gasifier, 6 797-798, 828 Krypton (Kr), 17 344 commercial, 17 368t complex salts of, 17 333-334 doubly ionized, 14 685 hydroquinone clathrate of, 14 183 in light sources, 17 371-372 from nuclear power plants, 17 362 physical properties of, 17 350 Krypton-85, 17 375, 376 Krypton compounds, 17 333-334 Krypton derivatives, 17 334 Krypton difluoride, 17 333, 336 uses for, 17 336... 

Silver difluoride, 0014 Silver fluoride, 0013 Sodium chloride, 4036 Sodium iodide, 4623 Tantalum pentachloride, 4185 Tellurium tetrabromide, 0296 Thallium, 4922 Tin(II) chloride, 4116 Tin(IV) chloride, 4174 Tin(II) fluoride, 4331 Titanium(II) chloride, 4117 Titanium dibromide, 0284 Titanium diiodide, 4630 Titanium tetrachloride, 4176 Titanium tetraiodide, 4638 Titanium trichloride, 4158... 

Tetrafluoroammonium hexafluoromanganate, 4384 Tetrafluoroammonium hexafluoronickelate, 4385 Tetrafluoroammonium hexafluoroxenate Tetranitromethane, 0546 Titanium tetraperchlorate, 4170 1,1,1 -Triacetoxy-1,2-benziodoxol-3-one, 3610 Trifluoromethyl hypofluorite, 0353 Trimethylsilyl chlorochromate, 1301 Trioxygen difluoride , 4323 Uranium hexafluoride, 4375 Vanadium(V) oxide, 4866 Vanadium trinitrate oxide, 4763 Vanadyl perchlorate, 4152 Xenon hexafluoride, 4377 Xenon(II) pentafluoroorthoselenate, 4382 Xenon(II) pentafluoroorthotellurate, 4383 Xenon tetrafluoride, 4353 Xenon tetrafluoride oxide, 4346 Xenon tetraoxide, 4863 Xenon trioxide, 4857 Zinc permanganate, 4710... 

Bis(fluorosulfuryl)peroxide, see Peroxodisulfuryl difluoride, 4322 Bis-3-(2-furyl)acryloyl peroxide, 3633 Bis(hexafluorobenzene)chromium(0), 3415 Bis(hexafluorobenzene)cobalt(0), 3413 Bis(hexafluorobenzene)iron(0), 3418 Bis(hexafluorobenzene)nickel(0), 3419 Bis(hexafluorobenzene)titanium(0), 3420 Bis(hexafluorobenzene)vanadium(0), 3421... 

Tetrafluoroammonium hexafluoromanganate, 4378 Tetrafluoroammonium hexafluoronickelate, 4379 Tetrafluoroammonium hexafluoroxenate, 4380 Tetranitromethane, 0543 Titanium tetraperchlorate, 4164 1,1,1 -Triacetoxy-1,2-benziodoxol-3-one, 3604 Trifluoromethyl hypofluorite, 0352 Trimethylsilyl chlorochromate, 1297 Trioxygen difluoride , 4317 Uranium hexafluoride, 4369 Vanadium trinitrate oxide, 4758 Vanadium(V) oxide, 4860 Vanadyl perchlorate, 4146 Xenon hexafluoride, 4371 Xenon tetrafluoride, 4347 Xenon tetrafluoride oxide, 4340 Xenon tetraoxide, 4857 Xenon trioxide, 4851 Xenon(II) pentafluoroorthoselenate, 4376 Xenon(II) pentafluoroorthotellurate, 4377 Zinc permanganate, 4705 ACETYLENIC PEROXIDES ACYL HYPOHALITES ALKYL HYDROPEROXIDES ALKYL TRIALKYLLEAD PEROXIDES AMINIUM IODATES AND PERIODATES AMMINECHROMIUM PEROXOCOMPLEXES BIS (FLUOROOXY)PERHALOALKANES BLEACHING POWDER CHLORITE SALTS... 

In contrast with the difluorides, the distribution of trifluorides extends to the third series of the transition metals, where iridium and gold trifluorides are fully characterized. In the second series, trifluorides are known for the elements from niobium to rhodium, with the exception of technetium, and in the first series, from titanium to cobalt. All the trifluorides have been characterized structurally, with earlier reports based on X-ray powder-diffraction data, since the compounds were not prepared in single-crystal form until more recently, when high-temperature, crystal-growth techniques became available. 

The heart of the SLM extraction procedure is the SLM unit, in which analyte extraction, preconcentration, and sample cleanup take place in one single step. The design of the SLM unit can be engineered according to the intended use of the unit. For instance, if an SLM unit is needed for an automated and flowing sample extraction, it can be manufactured from two blocks of polytetra-fluoroethylene (PTFE), poly vinylidine difluoride (PVDF), or titanium. However, for nonautomated, nonflowing SLM extraction, a short piece of porous HF membrane is used. 

Arylamido complexes of a general formula of Cp Zr[N(Ar)SiMe3]Cl2 can be obtained in a similar fashion. Thus, the reaction of Cp MCl3 with 1 equiv. of Li[N(Ar)SiMe3] produces complexes 31248 and 313.252 The difluoride 312 was prepared by metathesis reaction of the dichloride and Me3SnF. Upon activation with MAO, all complexes are active for polymerization of ethylene within complexes 312, the zirconium complexes are much more active than the analogous hafnium complexes, whereas within complexes 313, the zirconium complex exhibits poor activity as compared with the analogous titanium complex. 

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