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  • 1
    Electronic Resource
    Electronic Resource
    Investigations of polymerizations and metathesis reactions. 6. Metathesis-like reaction of a tungsten alkylidyne complex with cyclohexyl isocyanate (1986)
    s.l. : American Chemical Society
    Organometallics 5 (1986), S. 397-398 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00133a040
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  • 2
    Electronic Resource
    Electronic Resource
    Scattering of radiation by a large particle with a random rough surface (1982)
    Springer
    Earth, moon and planets 26 (1982), S. 197-208 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Intensity and polarization of scattered light by an absorbing spherical particle with a random rough surface and with a radius larger than the wavelength of radiation are investigated. Multiple reflections of incident light on the rough surface are treated based on the multiple scattering theory. Within the limits of our approximation the model gives good agreement with typical scattering features by irregular shaped particles derived by microwave analogue experiments and laser measurements, namely a backward enhancement of the intensity, and a reduction of magnitude of polarization. Our treatment will be provide a powerful tool for studying scattering problems of interstellar and/or interplanetary grains as well as those of asteroids and the Moon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00929281
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  • 3
    Electronic Resource
    Electronic Resource
    Umsetzungen von O-, N- und S-Carbenpentacarbonylchrom(0)-Komplexen mit N-Acyliminen des Hexafluoracetons zu Oxazolin-Derivaten und Thioäthern (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1581-1588 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LVI. Reactions of O-, N- and S-Carbenepentacarbonylchromium(0) Complexes with N-Acylimines of Hexafluoroacetone to Oxazoline Derivatives and ThioethersReactions of [alkoxy(aryl)carbene]-, [alkoxy(alkyl)carbene]- and [dimethylamino(phenyl)-carbene]pentacarbonylchromium(0) complexes with N-acylimines of hexafluoroacetone yield by ring-formation at elevated temperatures oxazoline derivatives, whereas reaction of [methyl(methylthio)carbene]pentacarbonylchromium(0) gives thioether derivatives with cleavage of the carbene ligand. 1H-n.m.r., i.r. and mass spectra of the new compounds are discussed.
    Notes: Umsetzungen von [Alkoxy(aryl)carben]-, [Alkoxy(alkyl)carben]- und [Dimethylamino(phenyl)carben]-pentacarbonylchrom(0)-Komplexen mit N-Acyliminen des Hexafluoracetons führen bei erhöhten Temperaturen unter Ringschluß zu Oxazolin-Derivaten, während die Umsetzung von [Methyl(methylthio)carben]pentacarbonylchrom(0) unter Spaltung des Carbenliganden Thioäther-Derivate ergibt. 1H-NMR-, IR- und Massenspektren der neuen Verbindungen werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060523
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  • 4
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXXVIII. Reaktion von Pentacarbonyl(hydroxymethylcarben)chrom(0) mit Dicyclohexylcarbodiimid (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3548-3553 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXXVIII. Reaction of Pentacarbonyl(hydroxymethylcarbene)chromium(0) with DicyclohexylcarbodiimidePentacarbonyl(hydroxymethylcarbene)chromium(0) reacts with dicyclohexylcarbodiimide (DCCD) by intramolecular elimination of water and subsequent cycloaddition of DCCD to give pentacarbonyl(1-cyclohexyl-4-cyclohexylimino-2-carbena-azetidine)chromium(0)(1). As by-product the ureidocarbene complex pentacarbonyl[N,N′-dicyclohexylureido(methyl)carbene]-chromium(0) (2) is formed via O,N-carbenyl rearrangement.
    Notes: Die Umsetzung von Pentacarbonyl(hydroxymethylcarben)chrom(0) mit Dicyclohexylcarbodiimid (DCCD) führt über intramolekular Wasserabspaltung und anschließende Cycloaddition von DCCD zu Pentacarbonyl(1-cyclohexyl-4-cyclohexylimino-2-carbena-azetidin)chrom(0) (1). Als Nebenprodukt entsteht durch O,N-Carbenylumlagerung der Ureidocarben-Komplex Pentacarbonyl[N,N′-dicyclohexylureido(methyl)carben]chrom(0)(2).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071109
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  • 5
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXXXV. Pentacarbonyl(organylcarben)chrom- und -wolfram-Reste als Amino-Schutzgruppen für Peptid-Synthesen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1868-1886 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXXXV. Pentacarbonyl (organylcarbene)chromium and-tungsten as Amino-Protecting Groups in Peptide SynthesesPentacarbonyl(methoxyorganylcarbene) complexes of chromium and tungsten (organyl = CH3, C6H5) react with amino acid esters to give aminocarbene complexes, in which the pentacarbonyl (organylcarbenyl) groups act as amino-protecting groups (1-15. The alkaline hydrolysis of the esters yields derivatives with free carboxyl groups (16-18), at which peptide coupling reactions are carried out by means of the dicyclohexylcarbodiimide /N-hydroxysuccinimide (DCCD/HOSU) method. The carbene complex protective groups can be cleaved off with trifluoroacetic acid (TFE) In the case of pentacarbonyl (organylcarbenyl) tungsten groups side reactions are observed. The cleavage of the carbene complex protecting group may also be achieved with 80% acetic acid. The pentacarbonyl(phenylcarbenyl) tungsten group of Wpc-Gly-OMe (8) can be cleaved off by BBr3 at - 25°C.
    Notes: Pentacarbonyl(methoxyorganylcarben)-Komplexe des Chroms und Wolframs (Organyl = CH3, C6H5) reagieren mit Aminosäureestern zu Aminocarben-Komplexen, in denen die Pentacarbonyl-(organylcarbenyl)-Reste als Amino-Schutzgruppen wirken (1-15). Die alkalische Verseifung der Ester liefert Derivate mit freier Carboxylgruppe (16-18), an denen Peptidverknüpfungen mit Hilfe der Dicyclohexylcarbodiimid/N-Hydroxysuccinimid (DCCD/HOSU)-Methode durchgeführt werden. Die Carbenkomplex-Schutzgruppen können mit Trifluoressigsäure (TFE) wieder abgespalten werden. Dabei beobachtet man bei Pentacarbonyl(organylcarbenyl)wolfram-Gruppen Nebenreaktionen. Die Abspaltung der Carbenkomplex-Schutzgruppe gelingt auch mit 80proz. Essigsäure. Die Pentacarbonyl(phenylcarbenyl)wolfram-Gruppe von Wpc-Gly-O Me (8) läßt sich mit BBr3 bei - 25°C abspalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090529
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  • 6
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LIV. Der Pentacarbonyl(phenylcarben)chrom(0)-Rest als Amino-Schutzgruppe für Peptid-Synthesen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1277-1284 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LV. Pentacarbonyl(phenylcarbene)chromium(0) as an Amino-Protecting Group in Peptide SynthesesAminolysis of pentacarbonyl[methoxy(phenyl)carbene]chromium(0) with aminoacid esters L-Phe-OMe, L-Pro-OMe, and L-Ala-OMe yields the corresponding N-carbene complexes 1-3 from pentacarbonyl(phenylcarbene)chromium(0) and the aminoacid esters. In the case of the L-Ala-OMe derivative the use of pentacarbonyl(phenylcarbene)chromium(0) as aminoprotecting group in peptide synthesis is studied. After alkaline hydrolysis of the methyl ester, reaction with L-Ala-OMe using the NHS/DCCD method gives the dipeptide derivative pentacarbonyl(phenylcarbene-L-Ala-L-Ala-OMe)chromium(0) (5), which yields analogously the tripeptide derivative pentacarbonyl(phenylcarbene-L-Ala-L-Ala-L-Ala-OMe)chromium(0) (6). 1H n.m.r., i.r. and mass spectra of the new compounds are discussed. The protecting group is cleaved off with trifluoroacetic acid at 20°C.
    Notes: Die Aminolyse von Pentacarbonyl[methoxy(phenyl)carben]chrom(0) mit den Aminosäureestern L-Phe-OMe, L-Pro-OMe und L-Ala-oMe liefert die entsprechenden N-Carbenkomplexe 1-3 aus Pentacarbonyl(phenylcarben)chrom(0) und den L-Aminosäure-methylestern. Am Beispiel des L-Ala-OMe-Derivates wird die Verwendung des Pentacarbonyl(phenylcarben)chrom(0)-Restes als Amino-Schutzgruppe für Peptidsynthesen untersucht. Nach der alkalischen Verseifung des Methylesters führt die Umsetzung mit L-Ala-OMe nach der NHS/DCCD-Methode zum Dipeptid-Derivat Pentacarbonyl(phenylcarben-L-Ala-L-Ala-OMe)chrom(0) (5), das in analoger Reaktion Zum Tripeptid-Derivat Pentacarbonyl(phenylcarben-L-Ala-L-Ala-L-Ala-OMe)chrom(0) (6) umgesetzt wird. 1H-NMR-, IR- und Massenspektren der neuen Verbindungen werden diskutiert. Die Abspaltung der Schutzgruppe erfolgt durch Trifluoressigsäure bei 20°C.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060424
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  • 7
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXXXIII: Darstellung und Reaktionen von zweikernigen Hydroxycarbenanhydrid-Komplexen des Chroms (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1120-1127 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition metal Carbene Complexes, LXXXIII: Synthesis and Reactions of Binuclear Hydroxycarbene Anhydride Chromium Complexes[Pentacarbonyl(hydroxyphenylcarbene)chromium]anhydride(1) reacts with dimethylamine to give pentacarbonyl[(dimethylamino)phenylcarbene]chromium(0) (2) and dimethylammoniumbenzoylpentacarbonylchromate (3). The acidic, p-phenyl-substituted (arylhydroxycarbene)pentacarbonyl chromium complexes (4,5) yield with dicyclohexylcarbodiimide (DCCD) by intermolecular water elimination binuclear (arylhydroxycarbene) pentacarbonylchromium anhydride complexes (6,7). The reaction of the anhydride complexes with tetraalkylammoniumhalides to give trans-(arylcarbyne) tetracarbonylhalogenochromium complexes and tetraalkylammoniumacylpentacarbonylchromates shows a strong in fluence of phenyl-substituents on the reactivity of the anhydride complexes.
    Notes: [Pentacarbonyl(hydroxyphenylcarben)chrom]-anhydrid (1) reagiert met Dimethylamin zu Pentacarbonyl[(dimethylamino)phenylcarben]chrom(0) (2) und Dimethylammonium-benzoylpentacarbonylchromat (3). Die aciden p-phenyl-substituierten (Arylhydroxycarben)pentacarbonylchrom-Komplexe (4,5) ergeben mit Dicyclohexylcarbodiimid (DCCD) unter intermolekularer Wasserabspaltung die zweikernigen [(Arylhydroxycarben) pentacarbonylchrom]-anhydrid-Komplexe (6,7). Die Umsetzung der Anhydridkomplexe mit Tetraalkylammonium-halogeniden, die zu trans-(Arylcarbin)tetracarbonylhalogenochrom-Komplexen und Tetraalkylammonium-acylpentacarbonylchromaten führt, zeigt einen starken Einfluß der Phenylsubstituenten auf die Reaktivität der Anhydridkomplexe.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090334
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  • 8
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carbin-Komplexe, IV. Umsetzung von Pentacarbonyl(hydroxyphenylcarben)-Komplexen des Chroms und Wolframs mit Dicyclohexylcarbodiimid zu zweikernigen Hydroxycarben-anhydrid-und „Carben-Carbin“-metall-Komplexen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3554-3561 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbyne Complexes, IV. Reaction of Pentacarbonyl(hydroxyphenylcarbene) Complexes of Chromium and Tungsten with Dicyclohexylcarbodiimide Forming Binuclear Hydroxycarbene Anhydride and “Carbene-Carbyne” Metal ComplexesThe reaction of pentacarbonyl(hydroxyphenylcarbene)chromium(0) with dicyclohexylcarbodiimide (DCCD) gives by intermolecular water elimination [pentacarbonyl(hydroxyphenylcarbene)chromium] anhydride (1), whereas the reaction of DCCD with the analogous tungsten-carbene complex yields trans-(benzoylpentacarbonyltungstenato-O)tetracarbonyl-(phenylcarbyne)tungsten (2). -1 and 2 react with tetraalkylammonium halides to form the corresponding trans-tetracarbonylhalogeno(phenylcarbyne)chromium or tungsten complexes and tetraalkylammonium benzoylpentacarbonylmetallates.
    Notes: Während die Reaktion von Pentacarbonyl(hydroxyphenylcarben)chrom(0) mit Dicyclohexyl-carbodiimid (DCCD) unter intermolekularer Wasserabspaltung zu [Pentacarbonyl(hydroxy-phenylcarben)chrom]-anhydrid(1) führt, ergibt die Umsetzung von DCCD mit dem analogen Wolfram-carben-Komplex unter Abspaltung eines CO-Liganden trans-(Benzoylpentacar-bonylwolframato-O)tetracarbonyl(phenylcarbin)wolfram (2). -1 und 2 reagieren mit Tetraalkylammoniumhalogeniden zu den entsprechenden trans-Tetracarbonylhalogeno(phenylcarbin)chrom- bzw. -wolfram-Komplexen sowie Tetraalkylammonium-benzoylpentacarbonyl-metallaten.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071110
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  • 9
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carbin-Komplexe, IX: Umsetzungen von Pentacarbonyl(hydroxyorganylcarben)wolfram-Komplexen mit Dicyclohexylcarbodiimid zu zweikernigen Carben-Carbin-Komplexen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1128-1139 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbyne Complexes, IX: Reaction of Pentacarbonyl(hydroxyorganylcarbene)tungsten Complexes with Dicyclohexylcarbodiimide (DCCD) to Form Binuclear Carbene Carbyne ComplexesPentacarbonyl(hydroxyorganylcarbene)tungsten complexes react with dicyclohexylcarbodiimide (DCCD) to yield the binuclear carbene carbyne complexes 2a-d and 3 by intermolecular elimination of water and substitution of the trans-Co-ligand by an acylpentacarbonylmetallate group. The constitution of the carbene carbyne complexes is elucidated by their i. r., 1H n. m. r., and 13C. n. m. r. spectra and reactions with tetraalkylammonium halides, which produce trans-tetracarbonylhalogeno(organylcarbyne)tungsten complexes and tetraalkylammonium acylpentacarbonylmetallates.
    Notes: Pentacarbonyl(hydroxyorganylcarben)wolfram-Komplexe reagieren mit Dicyclohexylcarbodiimid (DCCD) unter intermolekularer Wasserabspaltung und Substitution des trans-ständigen CO Liganden durch einen Acylpentacarbonylmetallat-Rest zu zweikernigen Carben-Carbin-Komplexen 2a-d) und 3. Die Konstitutionsaufklärung der Carben-Carbin-Komplexe gelingt durch ihre IR-,1H-NMR-und 13C-NMR-Spektren, sowie durch ihre Reaktion mit Tetraalkylammonium halogeniden, die zu trans-Tetracarbonylhalogeno(organylcarbin)wolfram-Komplexen und Tetraalkylammonium-acylpentacarbonylmetallaten führt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090335
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  • 10
    Electronic Resource
    Electronic Resource
    Heterogene Bimetall-Metathesekatalysatoren aus Carbenkomplexen des Fischer-Typs und dem reduzierten Phillips-KatalysatorUntersuchungen von Polymerisations- und Metathesereaktionen, 11. Mitteilung. - 10. Mitteilung: K. Weiss, K. Hoffmann, Z. Naturforsch. B 42 (1987) 769. (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 100 (1988), S. 268-270 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19881000209
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