Acetylacetone trifluoro

Reaction of Os(PPh3)3H4 and /J-diketonates L gives Os(PPh3)2L2 (L = acetylacetonate, trifluoro-acetylacetonate, hexafluoroacetylacetonate). A cis structure is thought to be likely IR and H NMR data were obtained.429... 

Chromium, tetraaquadichloro-chloride dihydrate hydrate isomerism, 1, 183 Chromium, tetrabromo-solvated, 3, 758 synthesis, 3, 763 Chromium, tetrachloro-antiferromagnetic, 3, 761 ferromagnetic magnetic properties, 3,7559 optical properties, 3,759 structure, 3,759 solvated, 3. 758 synthesis. 3, 759 Chromium, tetrachlorooxy-tetraphenylarsenate stereochemistry, 1,44 Chromium, tetrahalo-, 3,889 Chromium, tetrakis(dioxygen)-stereochemistry, 1,94 Chromium, triamminediperoxy-structure. 1, 78 Chromium, tricyanodiperoxy-structure, 1, 78 Chromium, trifluoro-electronic spectra, 3, 757 magnetic properties, 3, 757 structures, 3, 757 synthesis, 3, 756 Chromium, trihalo-clcctronic spectra, 3, 764 magnetic properties, 3, 764 structure, 3, 764 synthesis, 3, 764 Chromium, tris(acetylacetone)-structure. 1, 65 Chromium, tris(bipyridyl)-... 

Also increasingly common, as CVD precursors, are many halogen-acetylacetonate complexes, such as trifluoro-acetylacetonate thorium, Th(C5H4F302)4, used in the deposition of thoriated tungsten for thermionic emitters, the trifluoro-acetylacetonates of hafnium and zirconium and the hexafluoro-acetylacetonates of calcium, copper, magnesium, palladium, strontium, and yttrium. 

Pyrolysis of hafnium acetyl acetonate, Hf(C5H702)3, at 400-750°C or hafnium trifluoro-acetylacetonate, Hf(C5H402p3)4 at 500-550°C with helium and oxygen as carrier gases. 

MOCVD of Zirconia. Yttria-stabilized zirconia is also deposited by MOCVD.Deposition can be accomplished by the codecomposition of the tetramethyl heptadiones of zirconium and yttrium, Zr(CjjHj902)3 and Y(CjjHj902)3, at 735°C. Deposition is also achieved by the decomposition of the trifluoro-acetylacetonates in a helium atmosphere above 300°C.P 1 Other potential MOCVD precursors are bis(cyclopentadienyl)zirconium dichloride, (C5H5)2ZrCl2, and zirconium (IV) trifluoroacetylacetonate,... 

EDA = ethyl diazoacetate MDA = methyl diazoacetate OTf = 03SCF3 (trifluoro-methanesulfonate) acac = acetylacetonate hfacac = hexafluoroacetylacetonate. 

The Cotton effects in mixed amino acidate/acetylacetonate complexes [Cr(acac)2L] (L = l-alanine, L-valine or L-phenylalanine) have been studied 774 absolute configurations were assigned by reference to the parent tris(acetylacetonate) complexes. Synthesis was achieved by the photolysis of mixtures of the amino acid and [Cr(acac)3]. The partial photoresolution of both cis- and irans-(l,l,l-trifluoro-2,4-pentanedionato)chromium has been accomplished by irradiation with circularly polarized light (5461 A) in chlorobenzene solution.775 The results indicated that both bond rupture and twist mechanisms were important. A number of other jS-diketonates have also been investigated.776... 

The electrophilic substitutions of acetylacetonate complexes have been taken as suggesting aromatic character in the chelate ring. Results with seventeen different 1,3-diketonatochromium(III) complexes were recently held to support this suggestion (176-178 equation 43).784 The bromination of tris(l,l,l-trifluoro-2,4-pentanedionato)chromium(III), previously claimed to be unreactive,785 has been reported.786... 

There are clear similarities in the negative-ion mass spectra of the M(trifluoro-acetylacetonate)3 complexes (M = Vra or Al111).379 The major ion peak corresponds to (ML3)- and this is followed in intensity by one for (L) changes in oxidation state are evident for the metals in the fragment ions. 

A compound related to acetylacetone is 1,1,1-trifluoro-acetylacetone (abbreviated Htfa) ... 

Tris (trifluoroacetylacetonato) cobalt(III) is formed from a bidentate ligand trifluoro-acetylacetone CF3C(OH) = CHCO-CII J. The structure of the complex drawn. The isomerism predicted and drawn the structures of isomers if isomerism is possible. 

Three-membered rings. The combination of PhI(OAc)2 and Cu(II) trifluoro-acetylacetonate is particularly useful for generating nitrenoid from 6-methylpyridine-2-sulfonamide. ... 

Fig. 15. Structures and the enol form for acetylacetone 2 8) trifluoroacetylacetone , and hexafluoroacetylacetone ) compared with corresponding structures in acetone 33) trifluoro-acetone ), and hexafluoroacetone (revalues)...

The major breakthrough that transformed metal chelate GC into a useful analytical technique was the introduction of fluorinated beta-diketone ligands, which formed complexes of greater volatility and thermal stability. Trifluoroacetylacetone (l,l,l-trifluoro-2,4-pentanedione—HTFA) and hexafluoro-acetylacetone (l,l,l,5,5,5-hexafluoro-2,4,-pentanedione—HHFA) are the fluorinated ligands most frequently employed. HTFA extended the range of metals that may be gas chromatographed with little or no evidence of decomposition to include Ga3+, In3+, Sc3+, Rh3+ and V4+. An example of a recent application is the analysis for beryllium in ambient air particulates. After filter sampling and extraction/chelation, packed column GC with electron capture detection allowed ppm level beryllium quantitation in collected particulates which corresponded to levels of 2-20 x 10 5 pg/m3 in the sampled air. 

Selenium, bis(diethyldithiocarbamato)-stereochemistry, 60 Selenium, bis(dithiofurancarbamato)-stereochemistry, 60 Selenium(II) complexes bis(dithiochelate), 60 Selenocyanate complexes linkage isomers, 186 Selenonium ions, trifluoro-stereochemistry, 37 Self-exchange reactions, 333 electron transfer rate constants, 347-353, 366 rate constants calculation, 348 rate constants, 362 Semicarbazide, 1,4-diphenylthio-ruthenium determination, 546 Semi-glycinecresol red metallochromic indicator, 557 Semi-xylenol orange metallochromic indicator, 557 Seven-coordinate compounds stereochemistry, 69-83 Sidgwick, Nevil Vincent, 16 Silicon, tris(acetylacetone)-configuration, 195... 

Alternate methods a) U.S. authors have used processes involving fractional extraction of the aqueous phase with benzene solutions of diketones [thenoyl trifluoracetone E. H. Huffman and L. J. Beaufait, J. Amer. Chem. Soc. 71, 3179 (1949) trifluoro-acetylacetone B. G. Schultz and E. M. Larsen, J. Amer. Chem. Soc. 12, 3610 (1950)]. One disadvantage of the thenoyl trifluoro-acetone process may be that the Zr, which is usually the major component, is preferentially extracted into the benzene phase. 

Nomenclature. The nomenclature of the metallic derivatives of the 1,3-diketones in the literatme has not been definitive. These compounds have usually been called acetylacetonates or derivatives of acetylacetonates, e.g., zirconium acetylacetonate, beryllium benzoylacetonate, and lanthamun trifluoroacetylacetonate. A better nomenclature is based on the extensions of the International Union of Chemistry (I.U.C.) rules for inorganic nomenclature to include all types of coordination compounds. Thus, the foregoing names become tetrakis(2,4-pentane-diono) zirconium, bis(l-phenyl-l,3-butanediono)-beryl-lium, and tris(l,l,l-trifluoro-2,4-pentanediono)lanthanum. Further examples are... 

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