It has been shown that air oxidation of alkaline aqueous solutions of sinapic acid produces both thomasidioic acid (1), and 6-hydroxy-5,7-dimethoxy-2-naphthoic acid (2) in high yield, with the relative amounts dependent on the basicity of the solution. It has also been shown that naphthoic acid ...
The synthesis of 2-hydroxy-6-naphthoic acid (2,6-HNA) from carboxylation of alkali-naphthoxide was studied with varying alkali cation types and reaction conditions such as reactant concentration, reaction time, temperature, and pressure. The product selectivity was strongly affected by the types...
The reaction of pentacarbonyl(pyrazolin-3-ylidene)chromium complexes, (2a–c) (R = Ph (a), C6H4NMe2-4 (b); (C5H4)FeCp (c)), with [AuCl(SMe2)], H[AuCl4], [PdCl2(NCPh)2] and [PtCl2(NCPh)2] gives, by transfer of the heterocyclic carbene ligand, new chloro pyrazolin-3-ylidene complexes of gold(I) a...
Previous studies have shown that alfalfa biomass possesses the potential to be a biosorbent for chromium(III) removal from contaminated and industrial wastewaters. However, the mechanism through which chromium(III) binds to alfalfa biomass has not been identified. Therefore, studies were conduct...
The enantioselective addition of allylstannanes to glyoxylates and glyoxals, as well as simple aromatic and aliphatic aldehydes, catalyzed by chiral (salen)Cr(III) complexes, has been studied. The reaction proceeded smoothly for the reactive 2-oxoaldehydes and allyltributyltin in the presence of...
The mixed-valent oxo-centered triiron(III, III, II) trifluoroacetate complex [Fe2IIIFeIIO(O2CCF3)6(H2O)3] was prepared by reacting anhydrous iron(III) chloride with boiling trifluoroacetic acid under nitrogen. The non-hygroscopic and readily available mixed-valent triiron trifluoroacetate comple...
New neutral and cationic chromium(III) complexes with N4 Schiff base ligands have been prepared and characterized. These complexes are active catalysts for the cycloaddition of CO2 and styrene oxide in CH2Cl2 solutions, affording epoxide conversions in a 39–92% range, with encouraging cyclic ca...
A new synthetic methodology for the preparation of carbonyl compounds from the oxidative cleavage of terminal olefins has been developed. With the use of TBHP in combination with chromium(III) stearate, selective oxidation of double bonds conjugated with aromatic ring or carbonyl group could be ...
The reaction of chromocene with trifluoroacetic acid in benzene yields blue-green crystals of the paramagnetic ionic complex [Cp2Cr]+[CpCr(OOCCF3)3]- (I) (μeff. 3.70 (297 K) to 3.41 (77 K) BM). Upon recrystallizing from THF, complex I gives blue needles of the monomer CpCr(OOCCF3)2 - THF (II...
A series of new half-sandwich chromium(III) complexes with asymmetric bidentate β-enaminoketonato ligands (3a-f), Cp[PhNC(CF3)CHC(C6H4R(o))O]CrCl (3a, R = H;3b R = CH3; 3c, R = F; 3d, R = CF3; 3e, R = phenyl; 3f, R = naphthyl), have been synthesized by treating CpCrCl2(THF) with 1.0 equiv. of ...
The synthesis and characterization of chromium basic carboxylate complexes, [Cr3(O2CR)6L3]+, containing trifluoroacetate, 3-fluoropyridine, 3-trifluoromethylpyridine, and 4-trifluoromethylpyridine are described. The substituted pyridine ligands are used as models of DNA bases to determine whethe...
Various synthetic routes to Cu(II) and Ba fluorocarboylate derivatives as possible metal organic deposition (MOD) precursors of high Tc superconductors have been explored. The reactions between [Cu2(TFA)4]∞ or Cu2(TFA)4(MeOH)2 and [Ba(TFA)2]m (TFA = CF3CO2) with various O- and N-donor ligands g...
The molar conductivity curve and changes in the visible spectrum induced by changing concentrations have been determined for Cu(CF3COO)2 in dimethyl sulphoxide (DMSO) solution, at 25°C. Coupled with the spectra of the Cu(ClO4)2 + Bu4N CF3COO mixed solutions the results indicate occurence of the...
The copper(I) catalyzed cycloaddition reaction of N-Boc propargyl amine (dipolarophile) 1 with benzyl azide (1,3-dipole) 2 was found to proceed smoothly in t-BuOH/H2O at room temperature, to furnish the corresponding 1,4-disubstituted-[1,2,3]-triazole-derived N-Boc amine 3 in good yield. Deprote...
With the use of a chiral ligand-exchange chromatography (CLEC) system operating with the O-benzyl-(S)-serine [(S)-OBS] [1], [2] as the chiral mobile phase (CMP) additive to the eluent, the effect of the copper(II) anion type on retention (k) and separation (α) factors was evaluated, by rational...
Photochemistry of copper(II) acetate and polyfluorocarboxylates in liquid and frozen alcohol solutions has been investigated. The photolysis of copper(II) acetate leads to the metal copper as a final product. The mechanism of photolysis, including the intramolecular electron transfer as the init...
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is often applied to assess the dispersity and the end groups of synthetic polymers through the addition of cationizing agents. Here we address how these cation adducts are formed using polystyrene (PS) as a model polymer. W...
Reacting the fluorous carboxylate C8F17CO2·HNEt3 with Cu(OTf)2 in acetone leads, depending on the carboxylate/copper ratio, either to the neutral dimeric complex [Cu2(C8F17CO2)4(acetone)2] (2), or to the dianionic monomeric complex [Cu(C8F17CO2)4](HNEt3)2 (4). Both complexes were characterized ...
We present the use of the thermal analysis techniques to study yttrium trifluoroacetate thin films decomposition. In situ analysis was done by means of thermogravimetry, differential thermal analysis, and evolved gas analysis. Solid residues at different stages and the final product have been ch...
A volatile complex of copper(II) trifluoroacetate with 1,4-dioxan has been obtained together with its acetate and trichloroacetate analogues. These compounds have been found to be convenient precursors for the metal organic chemical vapour deposition (MOCVD) technique for the synthesis of copper...
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