Reactions of Some Terpenes and Their Derivatives with Acylating Agents in the Presence of Aluminosilicate Catalysts

Reactions of camphene, -fenchene, limonene, caryophyllene, - and -pinenes, verbenol, walterol, and verbenone with acylating agents in the presence of clay K-10 and wide-porous -zeolite were studied. Presumable schemes and rules of the occurring processes were considered.     

Effects of nonlocal electron kinetics and transition from αto γ regime in an RF capacitive discharge in nitrogen

The electron kinetics and regime of operation of asymmetrically coupled RF (27-MHz) nitrogen discharges in two vessels with different interelectrode gaps over the range of 0.20-0.35 torr gas pressure are studied in terms of the electron energy distribution function (EEDF). The latter is measured by means of a computer-controlled data acquisition system, a Langmuir probe with cross-modulation second derivative technique applied. The experiments are performed with an axial resolution along the RF electric field and accompanied with a measurement of electrical discharge characteristics. The effects of local and nonlocal plasma response are considered. The transition between α and γ discharge regimes is registered by measuring the EEDF and its moments' changes with the increase of the RF discharge current density     

Intermolecular interactions of 1-vinyl-1,2,4-triazole in various solvents

The solvent effect on intermolecular interactions of 1-vinyl-1,2,4-triazole was estimated by ¹H NMR spectroscopy. It was shown that 1-vinyl-1,2,4-triazole molecules form homoassociates (molecular stacks) which are broken on dilution with CCl₄. In polar solvents (dimethylacetamide-d ₆, D₂O), monomer-solvent heteroassociates prevail.     

Reactions of Caryophyllene 4β,5α-Epoxide with Carbonyl Compounds on Clay

Products of reaction between caryophyllene 4,5-epoxide and carbonyl compounds (acrolein, crotonaldehyde, -methacrolein, and acetone) were synthesized on clay. Two diastereomers in reaction with each aldehyde and a single isomer with acetone were obtained. In reaction of the epoxide with acetone an isomerization product was isolated, 4,4,9-trimethyltricyclo[6.2.2.0^{1 , 5}]dodec-9-en-2-ol that was unknown before.     

Superacid isomerization of phylloclandene,isophylloclandene, and phylloclandanol

It has been established that, on interaction with a superacid, phyllocladene (XI), isophyllocladene (XV), and phyllocladan-16-ol (XIX) give identical mixtures of substances which include phyllocladene (XI), isophyllocladene (XV), neoisoatisene (XX), tetracyclic hydrocarbons with a new carbon skeleton (XXI) and (XXII), and a mixture of methyl ethers of alcohols formed as the result of the addition of methanol to the carbocations arising on the protonation of the above-mentioned hydrocarbons.Institute of Chemistry, Academy of Sciences of the Moldavian SSR, Kishinev. Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 349–358, May–June, 1991.     

Proton exchange in 1-vinyl-1,2,4-triazole and its derivatives

Proton exchange at C(₅) of the triazole ring has been studied in 1-vinyl-1,2,4-triazole, 1-ethyl-1,2,4-triazole, poly-1-vinyl-1,2,4-triazole, and their quaternary salts. The rate of exchange is catalyzed by bases and inhibited by acids.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1365–1368, October, 1987.     

Rearrangements of Epoxides of Linalool and Nerolidyl Acetate in Acid Media

The behavior of epoxides of linalool and cis-nerolidyl acetate was comparatively investigated in acids of various strength with the goal of establishing the effect of the structure of the initial compound and the medium character on the main direction of cationoid rearrangement. Linalool epoxides undergo cyclization of solid acid catalysts affording oxygen-containing heterocyclic compounds whereas the nerolidyl acetate epoxides yield the ketones originating from the opening of the epoxy ring followed by 1,2-hydride shift. 10,11-Epoxy derivative of cis-nerolidyl acetate affords 7-oxanorbornane as a minor product.     

Reaction of carbon tetrachloride with hydrogen peroxide

Reaction of carbon tetrachloride with aqueous hydrogen peroxide in the presence of anhydrous iron(III) chloride was studied. Optimal conditions for the preparation of phosgene were found on the basis of analysis of the kinetic data and mechanism of the process. The reaction rate and yield (the latter reaching 95% in the stationary mode) are determined mainly by the amount of the heterogeneous catalyst. According to the experimental data, the reaction follows a radical mechanism.Translated from Zhurnal Organicheskoi Khimii, Vol. 40, No. 10, 2004, pp. 1455–1458.Original Russian Text Copyright © 2004 by Tatarova, Trofimova, Gorban, Khaliullin.