Hexafluoroacetyl-acetone

For some of the reactions depicted in Scheme 14, copper(II) hexafluoroacetyl-acetonate [Cu(hfacac)2] proved to be a better catalyst than other chelates neither cyclopropanes nor allylic insertion products were found, and the yield of dihydrofuran was not affected by temperature in the range 70-132 °C 130). However, in phenylogous vinyl ethers such as 4-methoxystyrene or trans-anethole, cyclopropanes (58a, b) rather than dihydrofurans resulted 131>. 

These compounds are used as the precursors for MOCVD processes. Compared with halides and hydrides, the metal-organic compounds have much more complex structures because they contain large functional groups (e.g. allyl, butyl, methyl etc) and ligands (such as carbonyl, acetylacetonate, hexafluoroacetyl acetonate and so forth). Some representative examples are listed below [19,22] ... 

For example, the Jji integral for the highest occupied o-orbital of the hexafluoroacetyl-acetonate ligand is small rather than large. 

Photoreduction of Fe(hfac)3. The MOssbauer spectrum of a (1 250) mixture of 57pe(hfac)3 (hfacH = hexafluoroacetyl-acetone) in solid ethanol indicates that the complex was isolated uniformly in the matrix (Fig. 9a). When this sample was irradiated with the 300-400 nm light from the ultrahigh pressure mercury lamp, a doublet for high spin iron(II) species developed with the increase in the photoirradiation period (6 "v141 h), at the cost of the magnetic iron(III), i.e., the parent complex (Fig. 9b v f) (14). 

Bis- and tris(hexafluoro-2,4-pentanedionato) (hexafluoroacetyl-acetonate, hfa) complexes of 23 different metal(II), (III), and (IV) ions have been prepared.1 5 Most of these have been isolated as low-melting solids, which can be readily sublimed unchanged between 25 and 150°. Most methods of synthesis of this class of complexes in different solvents have resulted in incomplete conversion to the chelate. For example, the copper complex Cu(hfa)2 has been prepared in 80% yield using excess ligand as the solvent. Several solvents having various polarities (water, ethanol, carbon tetrachloride, acetone) have been used. 

In 1997,itwas demonstrated that [Rh(hfacac)(cod)l (hfacac = hexafluoroacetyl-acetonate CF3COCHCOCF3) is an effective unmodified rhodium catalyst for the... 

The second hexanuclear manganese cage reported is the first high-spin cage . It is a cyclic molecule with a formula Mn(hfac)2(NITPh)]6 (hfac = hexafluoroacetyl-acetonate. 

A preliminary report on the self-luminescence of Bk(iii) in a LaCla host lattice was published in 1963 [86], and the self-luminescence spectra of Bk-doped Bap2 and SrCl2 were reported in 1978 [87]. The absence of ultraviolet-excited sharp-line sensitized luminescence of Bk-doped gadolinium hexa-fluoroacetyl acetonate has been noted [88,89]. Such luminescence was absent also in cesium berkelium hexafluoroacetyl acetonate chelate in anhydrous ethanol [88]. A study of Bk fluorescence in H2O and D2O solutions has been reported, and a basis for assessing the use of fluorescence detection for transuranic ions has been established [90]. 

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