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  • 1
    Electronic Resource
    Electronic Resource
    Stereochemistry at the Chiral Ruthenium Atom in Half-Sandwich Compounds of the Type [(.eta.6-Ar)Ru(LL*)L']X and [(.eta.6-Ar)Ru(LL*)-Hal]. X-ray Structure Analysis of [(.eta.6-cymene)Ru(LL*)(4-Mepy)]PF6 and Appeal to the Proper Use of Stereochemical Terminology (1995)
    s.l. : American Chemical Society
    Inorganic chemistry 34 (1995), S. 3349-3351 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00116a029
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  • 2
    Electronic Resource
    Electronic Resource
    Heterobimetallic Complexes Bridged by a Single 4e Sulfur Ligand: Addition of M'(CO)5 (M' = Cr, Mo, W) to the Ta:S Bond of (t-BuC5H4)2Ta(S)H (1995)
    s.l. : American Chemical Society
    Organometallics 14 (1995), S. 3623-3624 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00008a006
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  • 3
    Electronic Resource
    Electronic Resource
    Enantioselektive Katalyse, 121. Mitt. [1]: Chirale Phosphanliganden mit zusätzlichen Sauerstoffunktionalitäten (1998)
    Springer
    Monatshefte für Chemie 129 (1998), S. 339-354 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Phosphane ligands; Enantioselectivity; Catalysis; Cross coupling; Allylation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary.  New optically active phosphane ligands with additional ether and hydroxy functionalities were synthesied and used as sources of enantio-selectivity in the Ni-catalyzed cross coupling reaction of 1-phenylethyl Grignard and vinylbromide and in the Pd-catalyzed allylation of 1,5-dimethylbarbituric acid with allyl acetate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000092
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  • 4
    Electronic Resource
    Electronic Resource
    Optically Active Transition Metal Complexes CXX [1]. New Ruthenium(II) Complexes Containing Two Different Types of Optically Active Ligands (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 605-612 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Ruthenium(II) complexes; ( ; )-diop; Optically active co-ligands; Diastereomers;Stereoselectivity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Synthese von neuen Ruthenium(II)-Komplexen, die zwei verschiedene chirale Liganden enthalten, wird beschrieben. Diese Liganden sind zum einen (−)-diop und zum anderen optisch aktive Imine, die aus der Kondensation von (S)-1-Phenylethylamin mit 2-Pyrrolaldehyd oder 2-Salicyladehyd stammen. Die Synthese beinhaltet die Darstellung der Vorstufen, die aus 1,5-Cyclooctadien (cod) und den entsprechenden Iminliganden bestehen. Obwohl für die oktaedrischen (−)-diop-Imin-Ruthenium(II)-Komplexe sechs Diastereomere möglich sind, wird in einer hoch stereoselektiven Reaktion jeweils nur ein Diastereomer gebildet.
    Notes: Summary.  The synthesis of novel ruthenium(II) complexes containing two different chiral ligands is described. These ligands are on the one-hand (−)-diop and on the other hand optically active imines derived from the condensation of (S)-1-phenylethylamine with 2-pyrrolealdehyde or 2-salicylaldehyde. The synthesis includes the preparation of the precursors containing 1,5-cyclooctadiene (cod) and the corresponding imine ligands. Although for the octahedral (−)-diop-imine-ruthenium(II) complexes six diastereomers are possible, in highly stereoselective reactions only one diastereomer is formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010241
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  • 5
    Electronic Resource
    Electronic Resource
    Optisch aktive Übergangsmetall-Komplexe, X Carbonyl-Komplexe von Chrom(O), Molybdän(O) und Wolfram(O) mit Schiffschen Basen des Pyridin-carbaldehyds-(2) (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 770-783 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Optically Active Transition Metal Complexes, X Carbonyl Complexes of Chromium(O), Molybdenum(O) and Tungsten(O) with Schiff Bases of Pyridine-2-carbaldehydeMethods of preparation, properties, infrared, electron and mass spectra of tetracarbonyl-(pyridine-2-carbaldehyde imine) complexes of chromium(O), molybdenum(O) and tungsten(O) 7-9 are reported. 7-9 react with triphenylphosphine to form the tricarbonyl-triphenyl-phosphine-(pyridine-2-carbaldehyde imine) complexes 11-13. It was demonstrated by n.m.r. spectroscopy, that the triphenylphosphine ligand enters the cis-position to the azomethine-chelate ligand. In this case asymmetrical octahedral complexes are formed, which may exist in enantiomeric isomers.
    Notes: Es wird über Darstellungsmethoden, Eigenschaften, Infrarot-, Elektronen- und Massen-spektren der Tetracarbonyl-(pyridin-carbaldehyd-(2)-imin)-Komplexe von Chrom(O), Molybdän(O) und Wolfram(O) 7-9 berichtet. Die Umsetzung von 7-9 mit Triphenylphosphin führt zu den Tricarbonyl-triphenylphosphin-(pyridin-carbaldehyd-(2)-imin)-Komplexen 11-13. Mit Hilfe der Kernresonanzspektroskopie konnte nachgewiesen werden, daß der Triphenylphosphin-Ligand in cis-Position zum Azomethin-Chelatliganden eintritt. Dabei bilden sich asymmetrische oktaedrische Komplexe, die in enantiomeren Formen auftreten können.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050306
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  • 6
    Electronic Resource
    Electronic Resource
    Optisch aktive Übergangsmetall-Komplexe, XVI1) Kinetik und Mechanismus der Epimerisierung optisch aktiver Molybdän- und Wolfram-Verbindungen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 632-639 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Optically Active Transition Metal Complexes, XVI1) Kinetics and Mechanism of the Epimerisation of Optically Active Molybdenum and Tungsten CompoundsThe epimerisation of the tetragonal-pyramidal molybdenum compounds 1a and b as well as that of the tungsten complexes 2a and b was invesitgated polarimetrically in dimethylformamide and acetonitrile solution. The reactions proceed according to 1st order kinetics and their rate constants do not change on addition of the triphenylphosphine and Schiff bases. The tungsten complexes 2a and b epimerize appreciably faster than the corresponding molybdenum compounds 1a and b. The epimerization is proposed to occur by intramolecular pseudorotations.
    Notes: Die Epimerisierung der teteragonal-pyramidalen Molybdän-Komplexe 1a und b sowie der Wolfram-Verbindungen 2a und b wurde in Dimethylformamid- und Acetonitril-Lösung polarimetrisch verfolgt. Die Reaktionen verlaufen nach 1. Ordnung, und die Geschwindigkeitskonstanten ändern sich bei Zusatz von Triphenylophosphin und Schiffschen Basen nicht. Die Wolfram-Komplexe 2a und b epimerisieren deutlich schneller als die entsprechenden Molybdän Verbindungen 1a und b. Die Epimerisierung dürfte über intramolekulare Pseudorotationen verlaufen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060229
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  • 7
    Electronic Resource
    Electronic Resource
    Optisch aktive Übergangsmetall-Komplexe, XIII. Optisch aktive Azomethin-Derivate von Tricarbonyl-(cyclopentadienyl)molybdän- und -wolframchlorid (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3600-3610 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Optically Active Transition Metal Complexes, XIII. Optically Active Azomethine Derivatives of Tricarbonyl(cyclopentadienyl)molybdenum and -tungsten ChlorideThe reactions of Schiff bases of pyridine-2-carbaldehyde 5a-e with the tricarbonyl(cyclopentadienyl) chlorides of molybdenum 6 and tungsten 7 yield cationic complexes with asymmetric metal atoms. The compounds can be isolated as the chlorides 8 and 9 or the hexafluorophosphates 10 and 11, respectively. The i. r. and electronic spectra of the new compounds are reported. The 1H n.m.r. spectrum shows that the methyl groups of the isopropyl compound 10b are diastereotopic. (-)-1-phenylethylamine as amine component in the azomethine complexes 10e and 11e leads to diastereoisomeric species, which can be separated by fractional crystallisation. The new optically active compounds 12-15 have a remarkably high stability of the tetragonal-pyramidal configuration.
    Notes: Die Umsetzungen der Schiffschen Basen von Pyridin-2-carbaldehyd 5a-e mit den Tricarbonyl(cyclopentadienyl)chloriden von Molybdän 6 und Wolfram 7 ergeben kationische Komplexe mit asymmetrischen Metallatomen. Die Verbindungen können in Form der Chloride 8 und 9 bzw. der Hexafluorophosphate 10 und 11 isoliert werden. Die IR- und Elektronenspektren der neuen Verbindungen sind angegeben. Im 1H-NMR-Spektrum erweisen sich die Methylgruppen der Isopropyl-Verbindung 10b als diastereotop. (-)-1-Phenyläthylamin als Aminkomponente in den Azomethin-Komplexen 10e und 11e führt zum Auftreten diastereomerer Formen, die durch fraktionierte Kristallisation getrennt werden können. Die neuen optisch aktiven Verbindungen 12-15 zeichnen sich durch hohe Stabilität der tetragonal-pyramidalen Konfiguration aus.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051113
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  • 8
    Electronic Resource
    Electronic Resource
    Asymmetric Catalysis, 105Part 104: Ref.. Stereoselective Hydrogenation of Folic Acid with Immobilized Optically Active Rhodium(I)/Diphosphane Catalysts (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 55-62 
    Details
    ISSN: 0009-2940
    Keywords: Diastereoselective hydrogenation ; Folic acid ; Immobilized optically active rhodium(I)/diphosphane catalysts ; Leucovorin ; HPLC analysis of 5-formyltetrahydrofolic acid derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For the hydrogenation of the C=N bonds in the pyrazine ring of the vitamin folic acid (1) optically active rhodium(I)/diphosphane complexes immobilized on supports such as silica gel or Al2O3 were used. The reduction was carried out at 50 bar hydrogen pressure in an aqueous solution buffered to pH 7. Thus, 5,6,7,8-tetrahydrofolic acid (2) was obtained which contains a new asymmetric center at C-6 of the pterine system. Therefore, in combination with the (S) configuration of the natural L-glutamic acid part of the molecule two diastereomers with (6S,S) and (6R,S) configuration arise. The relatively unstable tetrahydrofolic acid (2) was converted into its 5-formyl derivative folinic acid (4) by treatment with methyl formate/formic acid in a 5:1 mixture of DMSO/pyridine. The Ca salt of folinic acid (4) is the widely used drug leucovorin. The diastereomers were separated by silica gel HPLC. To the column bovine serum albumine (BSA) is covalently bound. With optically active rhodium(I)/diphosphane catalysts, immobilized on silica gel supports, a diastereoselectivity of up to 90% could be achieved in the hydrogenation of folic acid (1).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300109
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  • 9
    Electronic Resource
    Electronic Resource
    The Reaction of As4Sn (n = 3, 4) and As2S3 with (C5Me4R)2Co2(CO)2 (R = Me, Et): Fragmentation and Reassembling of Main-Group Ligands by Organometallic Complexes (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 657-662 
    Details
    ISSN: 0009-2940
    Keywords: Cobalt complexes ; Arsenic sulfides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of Cp2#Co2(CO)2 1 (Cp# = Cp* or Cpx; Cp* = C5Me5: a; Cpx = C5Me4Et: b) with equimolar amounts of As4Sn (n = 3, 4) and As2S3 was investigated at different temperatures. The formation of Cp2#Co2(CO)As2S2 3, Cp2#Co2As2S3 4, Cp3#Co3As2S4 5, and Cp3#Co3As4S2 6 was observed in ratios depending on the reaction conditions. Starting from As4S4 or As4S3 and 1b insertion of a CpxCo(CO) fragment into one of the As-As bonds of the cages was achieved in low yields leading to CpxCo(CO)As4S4 2b and CpxCo(CO)As4S3 8, respectively. Structures were studied by means of IR and 1H-NMR spectroscopy and X-ray diffraction analyses. Cp2#Co2(CO)As2S2 3 may be supposed to be the key intermediate in the whole reaction sequence: On heating solutions of 3 complexes 4-6 of higher nuclearity and different connectivity within the inorganic ligand were formed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290611
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  • 10
    Electronic Resource
    Electronic Resource
    Platin(II)-Komplexe mit Porphyrinliganden: Synthese und Synergismen bei der photodynamischen Tumortherapie (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 173-181 
    Details
    ISSN: 0009-2940
    Keywords: Porphyrins ; Platinum(II) complexes ; Photodynamic therapy ; Antitumor activity ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Platinum(II) Complexes with Porphyrin Ligands: Synthesis and Synergisms in the Photodynamic Tumor TherapyTwelve porphyrin ligands (2-5, 8, 13-16, 19, 27, 28) and their platinum(II) complexes (29-40) were synthesized and characterized. Nine of the porphyrins are derived from hemin, and three are based on tetraphenylporphyrin. The ligands were transformed into diammine-dicarboxylatoplatinum(II) complexes and diamine-dichloroplatinum(II) complexes. The antitumor activity in the photodynamic therapy of the ligands and their complexes was tested in vitro towards the MDA-MB-231 mammary carcinoma cell line. The results obtained showed an additive effect of the photodynamic activity of the porphyrin skeleton when irradiated with visible red light and the cytotoxic activity of the platinum moiety in the complexes.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280215
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