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  • 1
    Electronic Resource
    Electronic Resource
    Asymmetric synthesis of amino acids by catalytic reduction of azlactones of substituted acylaminoacrylic acids (1989)
    Springer
    Russian chemical bulletin 38 (1989), S. 1011-1014 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. It has been shown that when 2-methyl- and 2-phenyl-4-benzylideneoxazolin-5-ones react with a-phenylethylamine in dimethoxyethane the rate of opening of the oxazoline ring is dependent on the nature of the substituents at the para-position of the aromatic ring of the benzylidene group. Electron-donating substituents retard the process and electron-withdrawing substituents accelerate it. 2. It has been shown that replacement of Me by Ph on C2 of the oxazolone ring results in an increase in rate of aminolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00955436
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  • 2
    Electronic Resource
    Electronic Resource
    Polymeric Pd catalysts for the reduction of acetamidocinnamic acid azlactone and its solvolysis products (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 1858-1867 
    Details
    ISSN: 1573-9171
    Keywords: Pd catalysts on chiral polymers ; asymmetric reduction ; azlactones ; reductive aminolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pd complexes have been obtained from linear and cross-linked copolymers ofR,S-, R-, andS-1-(4-vinylphenyl)ethylamine (1) with styrene and divinylbenzene. Reduction of these compounds gave catalysts which were active in the reductive solvolysis of α-acetaminocinnamic acid azlactone (2) and hydrogenation of the solvolysis products α-acetamidocinnamic acid (ACA), its esters, and its 1-phenylethylamide. The catalysts showed no enantioselective properties in the reductive hydrolysis, but were more active than the catalyst obtained in the absence of the polymer (the “monomeric” analog). The use of polymeric catalysts has shown that, in reductive aminolysis, the chiral nucleophile plays the dominant part in determining the stereoselectivity of the reaction, rather than the chiral ligand of the catalytic complex. The polymer matrix stabilizes the low-valent state of the palladium in the complex. In the hydrogenation of ACA and its esters, the catalyst on the cross-linked polymer is much more active than its “monomeric” analog, but showed no enantioselectivity. Hydrogenation of acetamidocinnamic acidR-andS-1-phenylethylamides on a chiral Pd-polymer catalyst occurred with double asymmetric induction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863823
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum-chemical and spectroscopic studies of structures of 1 : 2 complexes of carbonyl compounds with aluminum halides (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 2717-2722 
    Details
    ISSN: 1573-9171
    Keywords: aluminum chloride ; aluminum bromide ; carbonyl compounds ; 1 : 1 and 1 : 2 complexes ; quantum chemical calculations ; IR spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Quantum-chemical calculations of model systems, namely, benzaldehyde and its 1 : 1 and 1 : 2 complexes with AlCl3, were carried out by the MNDO method. In the 1 : 2 complex, a bridging Al-Cl-Al bond occurs. Apparently, this complex is stabilized through the Coulomb interaction between the positively charged C atom of the carbonyl group and the AlCl3 fragment, which carries an excessive negative charge and which is not involved in donor-acceptor bonding with the carbonyl O atom. The IR spectra of the 1 : 1 and 1 : 2 complexes of benzophenone with AlBr3 were recorded, and the differences in the low-frequency regions of these spectra, which are indicative of the presence of the Br2Al-Br-AlBr3 fragment in the 1 : 2 complex, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01430629
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  • 4
    Electronic Resource
    Electronic Resource
    Catalytic alkylation of tetralin (1961)
    Springer
    Russian chemical bulletin 10 (1961), S. 1014-1017 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. The possibility of alkylating tetralin by primary alcohols of normal structure and containing C7, C10 and C12 in the liquid phase with the formation of 6-alkyltetralins of branched structure was demonstrated. 2. The yields of isoheptyl-, isodecyl- and isododecyltetralins amount to 49.5, 48.3 and 38.5% respectively, based on the original alcohol, and to ≈70% of theoretical based on the tetralin that reacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909178
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  • 5
    Electronic Resource
    Electronic Resource
    Rearrangement during the process of thermal telomerization of ethylene with silicon hydrides (1961)
    Springer
    Russian chemical bulletin 10 (1961), S. 1168-1171 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. Compounds of the general formula (CH3)3SiCnO2n +t, where n=2, 4, 6. 8,12,14,16, and (C2O5)3SiCnO2n+1, where n=2, 4,10,12,14,16 were obtained by a telorrierlzation reaction. 2. The IR-spectra of the listed, compounds, which showed the presence of branched chain next to the Si atoms, beginning with n=10, were studied. 3. The assumption is expressed that the spectrally observed rearrangement of the alkyl group Is observed as a result of telomerization by a process analogous to the branching of polyethylene, and leads to the formation of side chains containing more than one carbon atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01118747
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of 2-alkyl- and 2-aryl-biphenyls (1963)
    Springer
    Russian chemical bulletin 12 (1963), S. 142-146 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. By the reaction of 2-biphenylyllithium with carbonyl compounds the following compounds were prepared; 2-cyclohexylbiphenyl, 9-phenylfluorene, 9,9-diphenylfluorene, 2-(1-hexylheptyl)biphenyl, and 1-(2-biphenylyl)-1-(1-naphthyl)ethane. 2. The structures of these hydrocarbons were proved with the aid of ultraviolet and infrared spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00846965
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis and selective hydrogenation of dibenzylbenzenes and α,α′-bis(benzylphenyl)xylenes (1965)
    Springer
    Russian chemical bulletin 14 (1965), S. 107-115 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. The following previously undescribed hydrocarbons were prepared: 2-(cyclohexylmethyl)biphenyl, 3-(cyclohexylmethyl)biphenyl, 4-(cyclohexylmethyl)biphenyl, p-biscyclohexylmethylbenzene, 2-(cyclohexylmethyl)bicyclohexyl, 3-(cyclohexylmethyl)bicyclohexyl, 4-(cyclohexylmethyl)bicyclohexyl, 1,2-biscyclohexylmethylcyclohexane, 1,4-biscyclohexylmethylcyclohexane,α,α′-bis-o-benzylphenylxylene, and 1,4-bis[[4-(cyclohexylmethyl)cyclohexyljmethyl] cyclohexane. 2. The hydrogenation of dibenzylbenzenes andα,α′-bisbenzylphenylxylenes of various structure goes in various ways. Thus, under identical conditions of hydrogenation over PtO2 in 2-, 3-, and 4-benzylbiphenyls only one ring is hydrogenated, in p-dibenzylbenzene two rings are hydrogenated, and in α,α′-bis-p-benzylphenyl-p-xylene all five rings are hydrogenated. The selective hydrogenation ofα,α′-bis-p-benzylphenyl-p-xylene could not be effected, either over PtO2 or over Raney nickel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00854870
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  • 8
    Electronic Resource
    Electronic Resource
    Addition of arylfluorosilanes containing silicon-attached hydrogen (1965)
    Springer
    Russian chemical bulletin 14 (1965), S. 629-632 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. In additions to unsaturated compounds in presence of a H2PtCl6 catalyst, hydride arylfluorosilanes are considerably more reactive than their chloro analogs. 2. The arylfluorosilyl groups of difluorophenylsilane and difluoro-1-naphthylsilane add at both of the carbon atoms of the vinyl group of styrene (mainly at the α-carbon atom), whereas the dichlorophenylsilyl group of dichlorophenylsilane adds only, to the end carbon atom of the double bond. The fluorodiphenylsilyl group of fluorodiphenylsilane adds to almost equal extents at both carbon atoms of the vinyl group of styrene. 3. In high-temperature condensation with chlorobenzene the replacement of the chlorine atoms of dichlorophenylsilane by fluorine atoms leads to a reduction in the ratio of condensation and reduction products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00846717
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation in the series of condensed heteroaromatic systems including a thiophene ring (1972)
    Springer
    Russian chemical bulletin 21 (1972), S. 70-75 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Conclusions 1. Under the action of n-butyllithium on benzo-[b]-naphtho-[2, 3-d]-thiophene (I), the lithium atom is inserted in the 4-position of the benzonaphthothiophene system. 2. In the desulfurization of 4- and 7-alkyl derivatives of benzonaphthothiophene (I) by Raney nickel, together with desulfurization there is a partial hydrogenation of the alkyl derivatives ofβ-phenylnaphthalene formed. 3. On the basis of a comparative study of the IR spectra of 4- and 7-alkyl derivatives of benzonaphthothiophene (I) and alkyl derivatives of naphthalenes, general principles in the vibrational spectra of these systems were found, which permitted a reliable confirmation of the position of the substituent in 4- and 7-alkyl derivatives of (I).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00855658
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  • 10
    Electronic Resource
    Electronic Resource
    Vibrational spectra of monosubstituted acetylenes (1966)
    Springer
    Journal of applied spectroscopy 5 (1966), S. 176-179 
    Details
    ISSN: 1573-8647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The frequencies and envelopes (modes) of the normal vibrations of the molecules CH3C≡CH, FC≡CH, BrC≡CH, and IC≡CH have been calculated and their force constants determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00614480
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