Synthesis and Properties of Cadmium-containing Quinolinium and Pyrilium Salts

Consecutive treatment of methyl-substituted quinolinium and 2,6-diarylpyrilium perchlorates with sodium ethylate and equimolar amount of anhydrous cadmium(II) trifluoroacetate gives 2- and 4-methylenecadmium-containing salts of the above heterocyclic cations in 80-97% yields. The reactions of the cadmium-containing quinolinium and pyrilium salts with hydrochloric acid, acetic anhydride, mercuric trifluoroacetate, SnCl₂, and nickel(II) trifluoroacetate, resulting in substitution of the CdOCOCF₃ group by hydrogen, Ac, HgOCOCF₃, SnCl, and NiOCOCF₃, respectively, were studied.     

Reactions of 3-substituted 3-azabicyclo[3.3.1]nonan-9-ones with nitrogen-containing nucleophiles

Condensation of 3-substituted 3-azabicyclo[3.3.1]nonan-9-ones with hydroxylamine and hydrazine hydrate gave the corresponding oximes, hydrazones, and azines. Reductive amination of the title compounds in the presence of sodium triacetoxyhydridoborate led to the formation of 3-substituted 3-azabicyclo[3.3.1]nonan-9-amines which were converted into the corresponding dihydrochlorides by treatment with dry hydrogen chloride. Treatment of 3-tert-butoxycarbonyl derivatives with HCl under analogous conditions was accompanied by elimination of the tert-butoxycarbonyl group to produce 3-azabicyclo[3.3.1]nonan-9-amine dihydrochlorides.     

Schmidt reaction and beckmann rearrangement in the series of 3-azabicyclo[3.3.1]nonan-9-one derivatives

Russian Journal of Organic Chemistry -     

Reaction of Mercury(II) Trifluoroacetate with Deprotonated (η6-Toluene)-, (η6-Diphenylmethane)-, and (η6-Triphenylmethane)(η5-cyclopentadienyl)iron(II) Complexes. Mercuration of Some Cationic (Arene)(cyclopentadienyl)iron(II) Complexes

Treatment with mercury(II) trifluoroacetate of deprotonated (⁶-toluene)- and (⁶-diphenyl- methane)(⁵-cyclopentadienyl)iron(II) complexes gave mono-, di-, and trisubstituted [from (⁶-toluene)(⁵-cyclopentadienyl)iron(II) cation] mercury-containing salts. The reaction of mercury(II) trifluoroacetate with deprotonated (⁶-triphenylmethane)(⁵-cyclopentadienyl)iron(II) afforded only the corresponding sym- metric mercury derivative. The same product was obtained by direct mercuration with mercury(II) trifluoroacetate of (⁶-triphenylmethane)(⁵-cyclopentadienyl)iron(II) on heating the reactants in boiling unhydrous ethanol. Reactions of the resulting mercury-containing compounds with acids, symmetrizing bases, and acylating agents were studied.     

Kinetics of Mercuration of 2- and 4-Methyl-containing Salts of Heterocyclic Cations

Kinetics of the monomercuration by the active methyl groups of 2- and 4-methyl-containing salts of quinolinium, pyridinium, benzothiazolium, and pyrrilium with mercury(II) acetate and trifluoroacetate in a mixture of anhydrous ethanol and acetonitrile (3:1) at 50-70°C were studied by means of acid-base potentiometric titration. The apparent second-order rate constants of these reactions were estimated, and factors affecting their rate were considered. A mechanism of the reactions was offered.     

Mercuration with Mercury(II) Trifluoroacetate of (η6-Aniline)- or (N,N-dimethylaniline)(η5-cyclopentadienyl)iron(II)

The reaction of mercury(II) trifluoroacetate with the hexafluorophosphate of the ⁶-aniline-⁵cyclopentadienyliron(II) cation under reflux in dry ethanol gives rise to N-mono- and N,N-disubstituted mercury-containing salts of this cation. The same mercury-containing salts have been synthesized by the action of mercury(II) trifluoroacetate on the deprotonation product of the (⁶-aniline)(⁵-cyclopentadienyl)iron(II) cation. Direct mercuration of the [⁶-(N,N-dimethylaniline)](⁵-cyclopentadienyl)iron(II) cation into the para position of the benzene ring of the arene ligand has been performed. The reactivity of the compounds obtained has been studied.     

Highly transparent sol-gel derived ureasilicate monoliths exhibiting long-term optical stability

Optically clear and elastic organic-inorganic hybrid materials were synthesized by hydrolysis and condensation of ureasilicate precursors. Ammonia or citric acid was used as a catalyst for hydrolysis and condensation reactions. The influence of the catalyst nature and the precursor content on the optical, mechanical and thermal properties of samples was investigated. It was shown that it is possible to significantly change the elastic properties of the ureasilicates keeping their good optical transparency in the visible range. The preparation conditions assuring long-term optical and mechanical stability of the samples were determined.     

α-Ferrocenylalkylation of Some Biologically Active Compounds

Russian Journal of Organic Chemistry -     

Cavitation model of self-recovery of a magnetic-fluid membrane

A cavitation model describing the process of the expansion and collapse of an empty spherical cavity in a nonviscous fluid has been proposed for interpreting the dynamics of breakage and self-recovery of a magnetic-fluid membrane. The theoretical conclusions agree with the results of experiment.