Showing papers by "Tolstikov Genrikh A published in 1988"
TL;DR: In this paper, the most substituted carbon atom of the π-allylic ligand was used to give β, γ-unsaturated ketones in high yields, where the reaction took place at the most substituting carbon atom.
17 citations
TL;DR: In this article, the authors investigated the catalytic properties of piperylene polymerization with the LnHal3· 3TBP-Al(i-C4H9)3 (Ln=Ce, Pr, Nd, Gd, Tb, Dy; Hal=Cl, Br, I; TBP=tributylphosphate) catalysts.
13 citations
TL;DR: In this paper, a method was developed for the preparation of methylthiocyclopropanedicarboxylic acid derivatives based on reactions of azomethines with dimethylcarboethoxymethylidenesulfurane, which is generatedin situ from its sulfonium salt precursor and KOH in the presence of a phase transfer catalyst.
Abstract: ConclusionsA method has been developed for the preparation of methylthiocyclopropanedicarboxylic acid derivatives based on reactions of azomethines with dimethylcarboethoxymethylidenesulfurane, which is generatedin situ from its sulfonium salt precursor and KOH in the presence of a phase transfer catalyst.
11 citations
TL;DR: In this article, the authors investigated the inhomogeneity of 1,4-cis-polybutadienes obtained with a lanthanide-containing catalytic system; some kinetic parameters have been estimated for polymerizations.
10 citations
TL;DR: In this article, it was found that the interaction of geminal bis-sulphides with acyl(aroyl)peroxides forms systems which initiate polymerization in nonaqueous media.
5 citations
TL;DR: In this article, it was shown that the insecticidal activity of pyrethroids depends both on the stereochemistry of the cyclopropane fragment and on the orientation of a CN substituent in the side chain.
Abstract: The stereochemistry of the diastereomers of permethrin has been confirmed by13C NMR spectroscopy and the stereochemistry of the 9-CN derivative (cypermethrin) has been established. Diagnostic values of the diastereomeric effects have been determined for identifying diastereomers with respect to the cyclopropane ring and to the gem-dimethyl groups. It has been shown that the insecticidal activity of pyrethroids depends both on the stereochemistry of the cyclopropane fragment and on the orientation of a CN substituent in the side chain.
2 citations
2 citations
TL;DR: The13C NMR spectra of two acyclic diallenes exhibited diastereomeric signal splitting, which is formed as a result of interaction of two chiral axes presented by the two allene fragments.
Abstract: The13C NMR spectra of two acyclic diallenes exhibited diastereomeric signal splitting. Diastereomeric effects arise due to differences in the magnetic shielding of carbon nuclei in threo and erythro diastereomers, which are formed as a result of interaction of two chiral axes presented by the two allene fragments.
2 citations
TL;DR: The reactions of organotitanium compounds with allyl acetates, allyl phenyl ethers and allyl aryl sulfones are catalyzed by Pd complexes and lead to the formation of cross-coupling products as mentioned in this paper.
Abstract: The reactions of organotitanium compounds PhTi(OPr-i)3 and MeTi(OPr-i)3 with allyl acetates, allyl phenyl ethers, allyl aryl sulfones, and allylic tosylates and mesylates are catalyzed by Pd complexes and lead to the formation of cross-coupling products.
1 citations
TL;DR: The homodimerization of spiro{bicyclo[2.2.1]hepta-2,5-diene-7,1′-cyclopropane} (I) has been investigated in the presence of Ni-, Fe-, Co-, Rh-, and Ir-based metal complex catalysts.
Abstract: The homodimerization of spiro{bicyclo[2.2.1]hepta-2,5-diene-7,1′-cyclopropane} (I) has been investigated in the presence of Ni-, Fe-, Co-, Rh-, and Ir-based metal complex catalysts. Depending on the nature of the metal and its ligand environment cyclodimerization of (I) can take place via [2π+2π]-, [2π+2π+2π]-, and [4π+4π]-cycloaddition schemes, to give high yields of hepta-, octa-, and nonacyclic strained hydrocarbons.
1 citations
TL;DR: In this paper, it has been established that the rate of decompostion of dioxetanes changes in in sulfolane solutions on transition from the liquid to the solid phase, which is explained in terms of structural changes of the molecular complexes dioxetsane-sulfolane.
Abstract: It has been established that the rate of decompostion of dioxetanes changes in in sulfolane solutions on transition from the liquid to the solid phase, which is explained in terms of structural changes of the molecular complexes dioxetane-sulfolane in the solid phase of the solvent.
TL;DR: In the IR spectra of all the glycope~tides, absorption bands are observed of the NH groups in the 3200-3500 and 1520-1550 cmregions and of ester groups (COOMe, COOEr, OAc) at 1720-1760 cm -I region as mentioned in this paper.
Abstract: In the IR spectra of all the glycope~tides, absorption bands are observed of the NH groups in the 3200-3500 and 1520-1550 cmregions and of ester groups (COOMe, COOEr, OAc) at 1720-1760 cm -~. The absorption maxima of the carbonylamide group and carbonyl conjugated with a double bond are recorded in the 1650-1690 cm -I region. In the spectrum 6f glycopeptide llh there are additional maxima at 760 and 780 cm -~ (C-H arom). The UV spectra contain absorption maxima characteristic of 12-en-ll-one, in the 260-267 nm region. A maximum of the n § 7\" transition of the conjugated carbonyl is observed at 299-302 nm, as in the spectra df other nitrogen-containing derivatives of pentaacetylglYCYrrhizic acid [2]. The glycopeptide containing L-tyrosine (compound lib) is characterized by additional absorption bands with maxima at 212, 227, and 287 nm (HOC6H~). The properties of compounds lla-i are listed in Table i.
TL;DR: The reaction pathway for 2,3-disubstituted 7-adamantylidenenorbornanes with SC12 has been shown to depend on the reaction conditions and the steric distribution (orientation) and the nature of the substituents in the norbornane fragment as discussed by the authors.
Abstract: 1.
A series of 2,3-disubstituted 7-adamantylidenenorbornanes has been synthesized.
2.
The reaction pathway for 2,3-disubstituted 7-adamantylidenenorbornanes with SC12 has been shown to depend on the reaction conditions and the steric distribution (orientation) and the nature of the substituents in the norbornane fragment. Treatment of endo,endo-2,3-dimethoxycarbonyl-7-adamantylidenenorbornane with SC12 in CHC13 gave endo,endo-2,3-dimethoxy-carbonyl-2′,7-anti-epithia-7-adamantylnorbornane, while reaction of exo,exo-2,3-anhydrido-or exo,exo-2,3-dimethyl-7-adamantylidenenorbornane gave the corresponding chloroadamantyl-substituted products. Reaction of SC12 with substituted 7-adamantylidenenorbornanes containing methoxycarbonyl groups or a tetrahydrofuran fragment in the exo,exo-2,3-positions led to the formation of the corresponding chlorolactones and cyclic ethers.
TL;DR: In the absence of catalysts, sulfides or amines are not formed in the presence of catalyst or AICI products as mentioned in this paper, and are identi cied by comparison with authentic samples.
Abstract: Unsaturated sulf ides or amines are not formed in the absence of catalyst or (i-Bu)~AICI Products ( I I I ) and (IV) are ident i f ied by comparison with authentic samples [1] Phenyl 2E,7octadienyl sulf ide ( I ) : n~ s 15566 IR spectrum ( , cm-l): 3050, 1640, 1580, 1480, 1440, 1000, 975, 915, 740, 690 PMR spectrum (5, ppm): 090-158 m (2H, CH2), 166-210 m (4H, CH2) , 333 d (2H, S-CH2, J = 5 Hz), 460-583 m (5H, o le f in i c ) , 715 s (5H, Ph) M + 218
TL;DR: In this paper, optically active ozonide of [L(−)-menthyl] [o-phenylene] phosphite was obtained; its thermal stability was studied.
Abstract: The optically active ozonide of [L(−)-menthyl] [o-phenylene] phosphite was obtained; its thermal stability was studied.
TL;DR: In this article, the 1H and 13C NMR spectra of diols of the hexachlorobicycloheptene and-heptadiene series, and also of the diacetates and sulfites corresponding to them, have been investigated.
Abstract: The1H and13C NMR spectra of diols of the hexachlorobicycloheptene and-heptadiene series, and also of the diacetates and sulfites corresponding to them, have been investigated. Criteria for the stereochemical assignment of the compounds mentioned on the basis of chemical shifts and spin-spin coupling constants have been determined.
TL;DR: The reaction of monochlorodimethyl ether with different organoaluminum compounds is only a convenient method for the isolation of alkyl methyl ethers in the case of trialkylalanes.
Abstract: The reaction of monochlorodimethyl ether with different organoaluminum compounds is only a convenient method for the isolation of alkyl methyl ethers in the case of trialkylalanes.
TL;DR: The 1H and 13C NMR spectra of the diastereomers of 3-phenyl-5-isopropoxytetrahydro-2-furanone were obtained in this article.
Abstract: The1H and13C NMR spectra of the diastereomers of 3-phenyl-5-isopropoxytetrahydro-2-furanone were obtained. The stereoisomerism and preferred conformational states of these diastereomers were established by means of the spectroscopic criteria found for 3,4-disubstituted sulfolanes and 1,1,3,4-tetrasubstituted silacyclopentanes. It is shown that for the cis isomer the equilibrium is shifted to favor pseudoequatorial conformers, whereas for the trans isomer it shifted to favor ae conformers with a preferred pseudoequatorial orientation of phenyl substituent.
TL;DR: In this paper, two types of intermediate complexes are formed in the reaction of benzoyl peroxide with thioketals: S and O atoms and, in the second case, with the additional reaction of hydrogen atoms of the α-CH2 group of the alkyl group with the oxygen of the peroxide.
Abstract: 1.
Two types of intermediate complexes are formed in the reaction of benzoyl peroxide with thioketals: because of the reaction of S and O atoms and, in the second case, with the additional reaction of hydrogen atoms of the α-CH2 group of the alkyl group of the thioketal with the oxygen of the peroxide.
2.
The structure of the substituents at the geminal carbon atom does not affect the complexation process.
TL;DR: The liquid phase dehydrochlorination of polychloroalkanes catalyzed by quaternary ammonium salts proceeds with the formation of a catalytically active complex in the organic phase.
Abstract: 1.
The liquid-phase dehydrochlorination of polychloroalkanes catalyzed by quaternary ammonium salts proceeds with the formation of a catalytically active complex in the organic phase.
2.
The catalytically active complex contains a quaternary ammonium salt, hydroxyl-containing compound, and organochlorine substrate. The dehydrochlorination proceeds in the organic phase and on the phase separation surface.
TL;DR: In this paper, the 13C NMR was used to determine the diastereomeric effects of the chemical shifts, which are differential parameters bearing information on the stereochemistry of the molecules.
Abstract: The structure has been established and stereochemical assignments have been made of two complete sets of diastereomers of the 7-thia and 13-thia analogs of 11-deoxy-prostaglandins of the E1 series by the13C NMR method. It is proposed to determine the diastereomeric effects of the13C NMR chemical shifts, which are differential parameters bearing information on the stereochemistry of the molecules. Diagnostic diastereomeric effects have been found for assigning stereoisomers with respect to the C-15-hydroxy group and also with respect to the C-8 and C-12 chiral centers of the cyclopentane ring.
TL;DR: The major channel for the radiation chemical oxidation of this olefin is radical epoxidation as mentioned in this paper, and the ratio of the yields of the dioxetane and epoxide is a function of the competition between reactions with 02 and the carriers leading to 1O2 or radical products.
Abstract: 1.
The corresponding radical-cation is not formed in the radiolysis of dilute solutions of adamantylideneadamantane in toluene, acetone, and CH2Cl2. The major channel for the radiation chemical oxidation of this olefin is radical epoxidation. One of the sources of radical generation in acetone is the quenching of triplet acetone by oxygen.
2.
1O2 is formed and the olefin is oxidized to the dioxetane in the presence of excitation transfer carriers to dissolved oxygen in solvents with a high yield for the generation of excited states. The epoxide yield is reduced in this case and the ratio of the yields of the dioxetane and epoxide is a function of the competition between reactions with 02 and the carriers leading to1O2 or radical products.
TL;DR: The thermolysis of diethoxy(tert-butyl peroxide) aluminum takes place with the formation of products in electronically excited states without the participation of free radicals as mentioned in this paper.
Abstract: The thermolysis of diethoxy(tert-butyl peroxide) aluminum takes place with the formation of products in electronically excited states without the participation of free radicals. One of the emitters of luminescence is acetaldehyde.