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  • synthesis  (16)
  • Chemistry
  • Springer  (17)
  • 1995-1999  (17)
  • 1955-1959
  • 1950-1954
  • 1996  (17)
  • 1955
Collection
Keywords
Publisher
Years
  • 1995-1999  (17)
  • 1955-1959
  • 1950-1954
Year
  • 1
    Electronic Resource
    Electronic Resource
    Organometallic and coordination chemistry on phosphazenes. III. Synthesis, characterization, and electrochemical behavior of transition metal-cinnamonitrile cyclophosphazene derivatives (1996)
    Springer
    Journal of inorganic and organometallic polymers and materials 6 (1996), S. 145-170 
    Details
    ISSN: 1572-8870
    Keywords: Phosphazenes ; coordination chemistry ; synthesis ; electrochemical behavior ; transition metal ; cinnamonitrile cyclophosphazene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Hexakist 4-formylphenoxy cyclophosphazene (1) reacts with six equivalents of cyanomethylenetriphenylphosphorane to give hexakist 4-cinnamonitrile cyclotriphosphazene bearing 12 functional groups tsix nitriles and six olefins' able to coordinate up to 12 metals. In this way a series of polynuclear phosphazene metal derivatives (8–12) was prepared with different transition metals and in different oxidation states. Pt(0), Pt(II) and Rh(I). The analogous cinnamonitrile derivatives (3–7) were prepared and used as models for the characterization of corresponding phosphazene compounds. The redox properties of the complexes3–5 and8–10 as well as of the free cinnamonitrile2 and the free substituted cyclophosphazene1 have been investigated by cyclic voltammetry (CV) and controlled potential electrolysis (CPE) in aprotic media (THF, CH2Cl2, or NCMe 0.2M [NBu4][BF4]), at Pt electrodes. Cathodic processes have been detected only when the unsaturated C=C bond of the cinnamonitrile group is uncoordinated: hence, for compounds1. 4. and9. they are irreversible occur at potentialsE p red ca. −1.3 to ca. −1.9V vs SCE which are less cathodic than that exhibited by the free cinnamonitrile (2:E p red ca. −2.0 V vs SCE), and are believed to be centered at the electron-acceptor emptyπ * (C=C) orbital of each of the cinnamonitrile groups present in the molecule. Anodic processes are displayed only by complexes3. 5. 8. and10 with at least one Pt(0) site: they are irreversible, conceivably centered at such a metal center, and occur at potentials (E p bv ca. 0.7 1.2 V vs SCE) which are dependent on the electronic effects of the ligands, in particular the strong electron-withdrawing ability of the cyclophosphazene group. Complex10 undergoes dissociation in NCMe to form9 and possibly solvated [Pt(PPh3)2] species which adsorb at the electrode surface. No evidence for any redox process centered at the phosphazene ring has been found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01057745
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  • 2
    Electronic Resource
    Electronic Resource
    NMR spectra of a hydrocarbon-soluble organosodium compound and its lithium analogs (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 838-840 
    Details
    ISSN: 1573-9171
    Keywords: sodium alkyls ; lithium alkyls ; NMR ; synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 1H,23Na, and7Li NMR spectra of 2-ethyl hexylsodiurn, 2-ethylhexyllithium, and isobutyllithium obtained in the reaction of the corresponding alkyl chlorides and metals have been recorded. The1H N MR signal for the protons of the CH2Na group is shifted upheld compared with that for the protons of the CH2Li group (doublets at δ -0.88 and δ -0.83, respectively). The composition of the products of reaction of 2-ethylhexyl chloride with sodium depends on the form of the metal reagent employed. The use of sodium balls with diameter up to 2 mm results in the formation of products containing ionic chlorine (30–50 % with respect to Na); the reaction with the dispersion proceeds faster and the reaction product is chlorine-free. The23Na NMR spectra of these substances are also different, which is explained by the formation of 2-ethylhexylsodium complexes with NaCl in the former case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431309
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  • 3
    Electronic Resource
    Electronic Resource
    New reaction of the sodium salt of 2-nitroethanol. X-ray analysis of the sodium salt of 2-oxo-3-hydroxypropionic acid oxime, 2-bromo-2-nitropropane-1,3-diol, and the model 2,2-dinitropropane-1,3-diol (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1157-1161 
    Details
    ISSN: 1573-9171
    Keywords: 2-nitroethanol ; sodium salt ; 2-oxo-3-hydroxypropionic acid oxime ; sodium salt ; 2-bromo-2-nitropropane-1,3-diol ; 2,2-dinitropropane-1,3-diol ; synthesis ; X-ray analysis ; molecular structure, stereochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel reaction of the sodium salt of 2-nitroethanol in aqueous ammonia resulted in the sodium salt of 2-oxo-3-hydroxypropionic acid oxime (1) has been found. Bromination of1 affords 2-bromo-2-nitropropane-1,3-diol (2) with a previously unknown molecular conformation. The formation mechanisms of compounds1 and2 were suggested. X-ray analysis of products1,2 and that of the model compound, 2,2-dinitropropane-1,3-diol, was performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431611
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  • 4
    Electronic Resource
    Electronic Resource
    Chiral derivatives ofexo-metallofulierenes: Synthesis and X-ray study of solvate of platinumfullerene cluster with cyclooctene, η2-C60Pt[(+)-D1OP] · C8H14 (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1207-1213 
    Details
    ISSN: 1573-9171
    Keywords: metallofullerenes ; synthesis ; chirality ; platinum ; cluster ; electronic absorption spectra ; 31P NMR spectra ; X-ray analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel optically active exo-metallofullerene derivative, η2-C60Pt[(+)-DIOP] (1) (DIOP is 2,3-o,o'-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphinobutane)), is formed as a result of the cleavage of the chelate metallocycle in Pt[(+)-DIOP]2 and the substitution of the bidentate (+)-DIOP ligand with C60. Cluster 1 was also obtained by replacement of the phosphine ligands in η2-C60Pt(PPh3)2 by (+)-DIOP. Compound 1 was identified by its electronic absorption spectra,31P NMR spectra, and the elemental analysis data. A singlecrystal X-ray study of the 1 cyclooctene solvate, η2-C60Pt[(+)-DIOP] C8H14 was performed. Packing of the fullerene cores in a crystal of 1 · C8H 14 corresponds to the diamond structure subjected to the significant orthorhombic distortions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431621
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and structure of tetraphenylantimony hydrogen phthalate (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1977-1980 
    Details
    ISSN: 1573-9171
    Keywords: tetraphenylantimony hydrogen phthalate ; synthesis ; X-ray structural study ; molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Tetraphenylantimony hydrogen phthalate, Ph4SbOC(O)C6H4000H-o, was prepared by the reaction of pentaphenylantimony with phthalic acid. According to the data of X-ray structural analysis, the resulting compound is a trigonal-bipyramidal complex of antimony with three phenyl groups in equatorial positions; the fourth phenyl group and the carboxyl fragment are in axial positions. The CSbO angle is 177.5(1)° the Sb-C(Ph)eq and Sb-C(Ph)ax distances are 2.099(4)-2.177(4) A and 2.129(4) A, respectively. The H atom of the free carboxyl group and the carbonyl O atom of another carboxylate group form an intramolecular hydrogen bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01457791
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  • 6
    Electronic Resource
    Electronic Resource
    About the synthesis and thermal stability of SiO2-aerogel (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 515-520 
    Details
    ISSN: 1572-8943
    Keywords: SiO2-aerogel ; synthesis ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Aerogels are extremely porous high-tech materials based on inorganic oxides, especially silica. The paper describes synthesis and properties of SiO2-aerogel, and changes occurring during heating of SiO2-aerogel in the temperature range from 20 to 1000°C. Four thermoanalytical methods were used: Thermodilatometry, Differential thermal analysis, Thermogravimetry and Derivative thermogravimetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02135029
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of long-chain 2-alkadiynylpyridines (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 667-670 
    Details
    ISSN: 1573-9171
    Keywords: long-chain 2-alkadiynylpyridines ; synthesis ; Langmuir-Blodgett films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Four pathways of synthesis of 1-(2-pyridyl)heptacosa-12,14-diyne, using 10-bromodecan-1-ol and acetylene or tetradec-1-yne and 2-methylbut-3-yn-2-ol along with α-picoline as initial compounds, were studied and compared. It was shown that direct introduction of a completely formed unsaturated hydrocarbon chain into an α-picoline molecule by alkylation of its lithium derivative is the most appropriate method for preparation of long-chain 2-alkadiynylpyridines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435802
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and molecular structures of the racemate and themeso-form of 2,2′-propylidene-bis(η5-indenyl)zirconium dichloride (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 726-727 
    Details
    ISSN: 1573-9171
    Keywords: ansa-zirconocene dichlorides ; synthesis ; molecular structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A mixture ofrac- andmeso-2,2′-propylidene-bis(η5-indenyl)zirconium dichlorides was obtained in 95% yield. The compounds were separated, and their structures were established by X-ray structural analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435816
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of the first stable carborane containing simple enol (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1490-1491 
    Details
    ISSN: 1573-9171
    Keywords: carborane-containing ketones and enols ; synthesis ; isoncrization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A carborane-containing stable simple enol — 1-2-isopropyl-o-carboran-I-yl)-1-phenyl2-mesityl-2-lrydroxyctlrylcne — has been synthesized. This enol does not isomerize to the starting ketone or keto-enol mixture even after prolonged heating in benzene in the presence of CF3COOH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01434241
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  • 10
    Electronic Resource
    Electronic Resource
    19-Electron arenecyclopentadienyl complexes of ruthenium (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 1601-1607 
    Details
    ISSN: 1573-9171
    Keywords: arenecyclopentadienyl complexes of ruthenium ; synthesis ; electrochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of are necyc lope ntadienyl complexes,i. e., [Ru(η5-c5R5)(η6- are ne)]+ (1, R= H, arene = C6H6; 2, R = Me, arme = C6H6; 3, R = H, arctic = C6H3Me3; 4, R = Me, arene = C6H3Me3; 5, R = H, arene = C6Me6; 6, R = Me, arene = C6Me6) was studied by cyclic voltammetry. These compounds are capable of both oxidation and reduction. The reduction potential values depend on the number of methyl groups in the complex. Reduction of benzene complexes I and 2 by sodium amalgam in THF leads to the formation of decomplexation products, the addition of hydrogen to benzene, and dimerization of the benzene ligands. Both chemical and electrochemical reductions of mesitylene complexes3 and4 result in dimeric products [(η5-C5R5)Ru(μ-η5;η5-Me3H3C6H3Me3)Ru(η5-C5R5)] (14, R = H; 15, R = Me). The action of sodium amalgam on compound5 gives products of hydrogen addition to both hexamethylbenzene (17) and cyclopentadienyl (18) ligands along with the major product, the dimer [η5-C5H5)Ru(μ-η5; η5-Me6C6C6Me6)Ru(η5-C5H5)] (16). In contrast to5, its permcthylated analog 6 is only capable of adding hydrogen to the hexamethylbenzene ligand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01431794
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