Thenoyl trifluoroacetone

The carbanions derived from acylthiophenes have been condensed with aldehydes,and, through the Claisen condensation with esters, thienylsubstituted -diketones have been obtained. 2-Thenoyl trifluoroacetone, first prepared by Reid and Calvin through the Claisen condensation of 2-acetylthiophene with ethyl trifluoracetate, has become an extremely useful chelating agent for the extraction of numerous elements from strongly acidic solutions, The tautomeric form which dominates in aqueous solution is the ketone hy-drate. Other thiophenes have also proved useful for analytical purposes. ... 

An application has been found in which a system that exhibits an upper, or lower, critical consolute point, UCST or LCST, respectively, is utilized. At a temperature above or below this point, the system is one homogeneous liquid phase and below or above it, at suitable compositions, it splits into two immiscible liquids, between which a solute may distribute. Such a system is, for instance, the propylene carbonate - water one at 25°C the aqueous phase contains a mole fraction of 0.036 propylene carbonate and the organic phase a mole fraction of 0.34 of water. The UCST of the system is 73 °C (Murata, Yokoyama and Ikeda 1972), and above this temperature the system coalesces into a single liquid. Temperature cycling can be used in order to affect the distribution of the solutes e.g. alkaline earth metal salts or transition metal chelates with 2-thenoyl trifluoroacetone (Murata, Yokayama and Ikeda 1972). 

Hz) have been isolated, including octahedral Co(R R C=N—NHCOR )X2 (R = H, Me, or C5H10 R = Ph, p-MeOPh, or Me R = Ph, o-HOPh, or p-MeOPh X = NO3, Cl, Br, or SCN) and dimeric five-co-ordinate Co(R R C= NN=C0R )2- Formation constants have been reported for reactions between M bipy (M = Co, Ni, or Cu) and monoanions of the ) -diketonates acac, benzoyl-acetone, dibenzoylmethane and dipivaloylmethane. Cobalt ions have been extracted from an ion exchange resin by formation of Co(tta)2Bn (Htta = 2-thenoyl-trifluoroacetone, B = py base) and the synergistic effect decreased in the order py > > y-pic > a-pic > y-colidine isoquinoline > piperidine > 4-benzoyl-... 

Thenoyl chloride, 42 2-Thenoyl peroxide, 69 2-Thenoyl trifluoroacetone, 98... 

Solvent extraction by tributyl phosphate (TBP) (13, 96), dithizone (20, 71, 72), cupferron (89), thenoyl trifluoroacetone (TTA) (55), diiso-propyl ketone (26), mesityl oxide (92), tri-n-benzylamine and methyl di-n-octylamine (99), diisopropyl and diisobutyl carbinol (100) have all found some application on the trace scale. Acetylaeetone and methyl isobutyl ketone extract milligram amounts of polonium almost quantitatively from hydrochloric acid, but the stable polonium-organic compounds which are formed make it difficult to recover the polonium in a useful form from solutions in these ketones (7). Ion exchange (22, 115, 119) and paper chromatography (44, 87) have also been used for trace scale separations of polonium, but the effects of the intense alpha-radiation on organic com-... 

Many organic reagents have been used successfully in Pu separation processes. The reagents include tri- -butyl phosphate (TBP) methyl isobutyl ketone thenoyl trifluoroacetone (TTA) ethers, eg, diethyl ether, di- -butyl ether, tetraethylene glycol dibutyl ether trilaurylamine (TLA) tnoctyl amine (TOA) di- -butyl phosphate (DBP) hexyl-di(2-ethylhexyl) phosphate (HDEHP) and many others. Of these, TBP is by far the most widely used (30,95). 

The first reported laser action in rare earth complexes was obtained by Lempicki and Samelson [656] for europium benzoylacetonate in alcoholic solution. The laser parameters for this complex have also been evaluated by Lempicki and coworkers [656, 660] who found a slightly better quantum efficiency (0.8) for europium benzoylacetonate than for ruby (0.7), the solid state laser. The laser action of europium benzoylacetonate has also been investigated by Schimitschek [661] and Bhatjmik et al. [662]. Some other complexes of Eu3+ viz. dibenzoylmethide [665,664], m-4,4,4-trifluoro-l(2-thienyl)-l,3-butanedione [665], thenoyl-trifluoroacetonate [666, 667] were also found to lase. 

The extraction of Pa(IV) by benzoylacetone (HBA) from perchloric acid and sodium perchlorate was investigated in a recent study of the equilibria in diketone extraction. The indicated reaction is reported to be the same as that given in Eq. (8), where M = PaO or Pa(0H) + (79). Diketones have also been used in the study of aqueous complexation. Oxalate (80), sulfate, and fluoride complexing of Np(IV), Pu(IV) and Th(IV) have been studied by thenoyl trifluoroacetone (TTA) extraction. The Dj is always higher when TTA is dissolved in benzene than when it is dissolved in ii-hexane (81), which is contrary to the usual observation of higher D s in aliphatic diluents. 

An early conventional method for plutonium analysis was coprecipitation in acid solution with a rare earth fluoride, dissolution in aluminum nitrate solution with sodium nitrite to maintain the 4-4 oxidation state, and extraction into thenoyl-trifluoroacetone (TTA) in benzene. Plutonium was back-extracted into dilute HCl, the acid was evaporated, and plutonium was taken up in HCI-NH4CI solution... 

With thenoyl trifluoroacetone CulC HjS C0CH=C(CF3)0- 3 300 1471 2.01 Gouy 67C9... 

Production of superoxide radical anion (02 ) during oxidation of dihydroorotate in rat hver mitochondria was not affected by antimycin A, thenoyl-trifluoroacetone, or added ubiquinone but was inhibited by orotate, a product inhibitor of dihydroorotate dehydrogenase (Forman and Kennedy 1975). It appears likely that superoxide is generated at the primary dehydrogenase. Dihydroorotate dehydrogenase differs from succinate dehydrogenase both in its utilisation of ubiquinone and in the mechanism of cytochrome b reduction. Formation of orotate is only partially inhibited by thenoyltri-fluoroacetone and the inhibitor does not prevent the reduction of cytochrome by dihydroorotate. 

The crystal structure of dbmH has been determined by both X-ray and neutron diffraction methods. The intramolecular hydrogen bond is asymmetric, the difference in the O—H bond length being 0.199(17) A. The O O distance is 2.459(4) A. Similarly, tetraacetyl-ethane, 3,3 -dithiobis(2,4-pentanedione), 3,3 -trithiobis(2,4-penta-nedione), 2,2 -dithiobis(l-phenyl-l,3-butanedione), and thenoyl-trifluoroacetone have also been reported to exist in the enol form which contains an asymmetric hydrogen bond. 

A-Benzoyl-A-phenylhydroxylamine Pyrocatechol + EDTA or 2,2 Bipyridyl or l-(2-thenoyl)-3,3,3,-trifluoroacetone Bromopyrogallol red... 

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