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  • General Chemistry  (12)
  • Inorganic Chemistry  (12)
  • ASTRONOMY
  • Chemical Engineering
  • 1985-1989  (25)
  • 1955-1959
  • 1987  (25)
  • 1
    Electronic Resource
    Electronic Resource
    Synthese und Strukturanalyse von 1,2,3,4-Tetrahydrobenzo[g]chinoxalin-5,10-chinonen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1125-1132 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structure Analysis of 1,2,3,4-Tetrahydrobenzo[g]-quinoxaline-5,10-quinones2,3-Diamino-1,4-dihydroxynaphthalene reacts with different aromatic aldehydes to give 2,3-disubstituted 1,2,3,4-tetrahydrobenzo[g]quinoxaline-5,10-quinones (1-7). In the course of the reaction a new C-C bond is formed stereoselectively. The yields are in the range of 80%. The corresponding benzoquinoxalinequinone 8 with different substituents in 2- and 3-positions is formed by a two-step preparation. Oxidation of these trans products leads to the benzo[g]quinoxaline-quinones and subsequent catalytic reduction yields the cis isomers. The structures and the configuration of 1 and 9 were determined by X-ray crystallography. The conformations of the new heterocycles are discussed with respect to the results obtained in solid and liquid phase.
    Notes: 2,3-Diamino-1,4-naphthohydrochinon reagiert mit Benzaldehyden unter Cyclisierung und Protonenwanderung stereoselektiv zu 2,3-disubstituierten 1,2,3,4-Tetrahydrobenzo[g]chinoxalin-5,10-chinonen (1-7) (Ausbeuten ca. 80%). Benzochinoxalin-5,10-chinon 8, das in 2- und 3-Stellung unterschiedlich substituiert ist, wird durch eine zweistufige Reaktion erhalten. Die Anordnung der Phenylreste in 2- und 3-Stellung wird für 1 und 9 durch Röntgenstrukturanalysen ermittelt; beide Spezies liegen in trans-Konfiguration vor. Durch Oxidation zu Benzo [g]chinoxalin-chinonen und anschließende katalytische Hydrierung werden cis-Isomere erhalten. Unter Berücksichtigung der Ergebnisse aus den Kristallstruktur- und NMR-Untersuchungen werden verschiedene Konformationen diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200709
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  • 2
    Electronic Resource
    Electronic Resource
    Carben-analoge Reaktionen der Dehalogenierungsprodukte von Dichlor(diisopropylamino)boran mit Aromaten und 1,2-Dimethoxyethan (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1437-1439 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbene-Analgous Reactions of the Products of Dehalogenation of Dichloro(diisopropylamino)borane with Aromatic Compounds and 1,2-DimethoxyethaneSodium complexes of aromatic compounds in 1,2-dimethoxyethane react with dichloro-diisopropylamino)borane to give compounds formed via carben(oidal) intermediates: From naphthalene 1,2-bis(diisopropylamino)-1,1a,2,8b-tetrahydroborireno[2,3-b][3]benzoborepine (1) is formed. From acenaphthylene 2-(diisopropylamino)-2,3-dihydro-1H-naphtho[1,8-cd]borine (2) and with 1-methylnaphthalene, in addition to 1,2-bis[(diisopropylamino)methoxyboryl]ethyne (3), (diisopropylamino)dimethoxyborane (4) is isolated. 1H-, 11B-, 13C-, 14N-, 15N NMR and MS data are given. For 3 the X-ray structure is reported.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200823
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese von 1λ6- und 1λ4-1,2,6-Thiadiazinen aus S,S-Dialkylschwefeldiimiden (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1455-1459 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 1λ6- and 1λ4-1,2,6,-Thiadiazines from S,S-Dialkylsulfur Diimides1λ6,2,6-Thiadiazines 4a-h, 1λ4,2,6-Thiadiazines 5a-k, 6a,b, and ring-open products 3a-o are synthesized by reaction of dialkylsulfur diimides 1a-g with ethylene derivatives 2a-h. 1λ6,2,6-Thiadiazines 4h,b,c can be converted into 1λ4,2,6-Thiadiazines 5j, 6a,b under acid catalysis. The ring-open product 3n leads to 1λ6,2,6-thiadiazine 4a when heated with base.
    Notes: No Abstract
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200829
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  • 4
    Electronic Resource
    Electronic Resource
    Ein weiterer erfolgloser Versuch, Tetra-tert-butylethylen herzustellen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 871-872 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rather than providing the title compound 5 the reaction of tetraacetylethene (3) with excess dimethyltitanium dichloride (4) leads to 2,2,4,4,6,6,8,8-octamethyl-3,7-dioxabicyclo[3.3.0]octl(5)-ene (10). The mechanism of formation of this tetramethylated product is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200532
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  • 5
    Electronic Resource
    Electronic Resource
    Komplexe mit einem pentakoordinierten Kohlenstoffatom, III Goldverbindungen von (η5 -Cyclopentadienyl)(η5-2, 3-dihydro-1H-1, 3-diborol-2-yl)metall-Komplexen (Metall=Co, Rh) (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 911-914 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In the cobalt and rhodium sandwich complexes 2b and 3a the acidic hydrogen at C-2 is substituted by the isolobal Au-PPh3 group with formation of the dinuclear complexes 4b and 5a. Spectroscopic data and the X-ray structure determination of 4b establish the pentacoordination at the C-2 atom. In the NMR spectra of 5a3JPRh=12 Hz is observed.
    Notes: In den Cobalt- und Rhodium-Sandwichkomplexen 2b und 3a wird der acide Wasserstoff an C-2 durch die isolobale Au - PPh3-Gruppe unter Bildung der Zweikernkomplexe 4b und 5a ersetzt. Spektroskopische Daten und die Röntgenstrukturanalyse von 4b belegen die Pentakoordination am C-2-Atom. In 5a wird NMR-spektroskopisch 3JPRh=12 Hz beobachtet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200608
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  • 6
    Electronic Resource
    Electronic Resource
    Elementorganische Amin/Imin-Verbindungen, XXX1) η2-Koordinierte σ3-Phosphazene (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1885-1890 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Element-Organic Amine/Imine Compounds, XXX1). - η2-Coordinated σ3-PhosphazenesThe interaction of [(dppe)Ni(η2-R2N—P=NR)] (1a), R = SiMe3, with Me3SiN3, S8, selenium, and N2CHR′ (R′ = CO2tBu) affords the compounds [(dppe)Ni(η2-R2N(RN=)P=X)] (2) with side-on coordination of the P=X fragment for 2a (X = NSiMe3), 2b (X = S) and 2c (X = Se) as well as η2-coordination of the P = NR fragment for 2d (X = N2CHR′). The reaction of 1a and CO gives 3 with η2 → η1 change of the R2N—P=NR ligand. The 2a, b analogous bpy-nickel complexes 5a and 5b are formed from the nickelaazadiphosphetidine derivative 4 with Me3SiN3 and S8, respectively. 5a can also be synthesized from [(byp)Ni(η2-R2N—P=NR)] (1b) and RN3 (R = SiMe3). The σ3 phosphorus atom of 4 is oxidized by N2CHR′ with formation of the nickelaazadiphosphetidine derivative 6. 2a has been characterized by an X-ray structure analysis.
    Notes: Die Umsetzung von [(dppe)Ni(η2-R2N—P=NR)] (1a), R = SiMe3, mit Me3SiN3, S8, Selen und N2CHR′ (R′ = CO2tBu) ergibt die Verbindungen [(dppe)Ni(η2-R2N(RN=)P=X)] (2) mit side-on-Koordination des P=X-Teiles bei 2a (X = NSiMe3), 2b (X = S) und 2c (X = Se) sowie η2-Koordination des P=NR-Teiles bei 2d (X = N2CHR′). Die Reaktion von 1a3 mit CO führt unter η2 → η1-Koordinationswechsel des R2N—P=NR-Liganden zu 3. Die zu 2a und 2b3 analogen bpy-Nickelkomplexe 5a und 5b bilden sich aus dem Nickelaazadiphosphetidin-Derivat 4 und Me3SiN3 bzw. S8. 5a entsteht auch aus [(bpy)Ni(η2-R2N—P=NR)] (1b) und RN3 (R = SiMe3). N2CHR′ oxidiert den σ3-Phosphor von 4 unter Bildung des Nickelaazadiphosphetidin-Derivates 6. 2a wurde durch eine Röntgenstrukturanalyse charakterisiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871201118
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Umsetzungen von 2,6-Bis(tert-butyldimethylsilyloxy)-3,4-dihydropyridin, einem neuen, reaktiven Heterodien (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 657-658 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,6-Bis(tert-butyldimethylsilyloxy)-3,4-dihydropyridine (2) is synthesized by double silylation of glutarimide (1). Diels-Alder reactions of 2 with various dienophiles lead to the adducts 3a-c, 5, and 7. By hydrolysis of these compounds the new heterocycles 4a-c, 6, and 8 are obtained.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200433
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese und Stabilisierung von Isocyanatoketenen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 285-290 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The isocyanatocarbonyl chlorides 1a-m were prepared and converted to the corresponding isocyanatoketenes 2a-m by means of hydrogen chloride elimination with triethylamine. (Isocyanatoalkyl)ketenes with less then three carbon atoms between the functional groups yield crosslinked and oligomeric products, respectively, by intermolecular reaction of the different heterocumulene systems. (ö-Isocyanatoalkyl)aldoketenes with three and more carbon atoms between the functional groups (2d-h) stabilize uniformly by [2 + 2]-cycloaddition of the ketene groups to yield 3-(ö-isocyanatoalkyl)-4-(ö-isocyanatoalkylidene)-2-oxetanones (3d-h) (diisocyanatodiketenes). (4-Isocyanatophenyl)ketene (21) and (3-isocyanato-1,5-pentanediyl)ketene (2k) stabilize in analogy to the unsubstituted parent compounds to give 6l and 4k, respectively.
    Notes: Die Isocyanatocarbonsäurechloride 1a-m wurden durch Chlorwasserstoff-Abspaltung mit Hilfe von Triethylamin in die entsprechenden Isocyanatoketene 2a-m übergeführt und ihre Stabilisierungsprodukte untersucht. (Isocyanatoalkyl)ketene mit weniger als drei Kohlenstoffatomen zwischen den funktionellen Gruppen reagieren unter Bildung vernetzter bzw. oligomerer Produkte infolge intermolekularer Reaktion der beiden kumulierten Doppelbindungssysteme. (ö-Isocyanatoalkyl)aldoketene mit drei und mehr Kohlenstoffatomen zwischen den funktionellen Gruppen (2d-h) stabilisieren sich ausschließlich durch [2 + 2]-Cycloaddition der Ketengruppen unter Ausbildung von 3-(ö-Isocyanatoalkyl)-4-(ö-isocyanatoalkyliden)-2-oxetanonen (3d-h) (Diisocyanatodiketenen mit ß-Lactonstruktur). (4-Isocyanatophenyl)keten (21) und (3-Isocyanato-1,5-pentandiyl)keten (2k) stabilisieren sich, wie von den isocyanatfreien Verbindungen bekannt, zum Cyclobutenolon 61 bzw. 1,3-Cyclobutandion 4k.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200306
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  • 9
    Electronic Resource
    Electronic Resource
    1,2,3,4,5-[1′,8′] Anthra-8,9;10,11-dibenzo[13]annulene and 1,8-Distyrylanthracene as Models for Phenylenevinylene Species. Syntheses, Structures, and Redox Properties (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1491-1497 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2,3,4-[1′,8′]Anthra-8,9;10,11-dibenzo[13]annulen und 1,8-Distyrylanthracen als Modelle für Phenylenvinylen-Systeme. Synthesen, Strukturen und RedoxeigenschaftenDie Synthesen der formal als [13]Perimeter aufzufassenden Titelverbindungen 4 und ihres acyclischen Modellsystems 1,8-Distyrylanthracen (6) werden beschrieben. Die Kristallstruktur von 4 zeigt die Konfiguration der Doppelbindungen und die Konformation des Makrocyclus auf. Entsprechende Befunde ergeben sich aus den 1H-NMR-Spektren von 4 und 6 in Lösung. Die Spindichteverteilung in den Radikalanionen 4-· und 6-· wird im Hinblick auf die Art des einfach besetzten Molekülorbitals und auf die Molekülgeometrie diskutiert. Verbindung 6 erweist sich als effizienter Elektronenakzeptor, denn es kann zu einem Tetraanionsalz reduziert werden. Die komplette Redoxsequenz wird mit Hilfe der NMR- und ESR-Spektroskopie charakterisiert.
    Notes: The synthesis of the title compound 4, formally a [13] perimeter, and of its acyclic model system, 1,8-distyrylanthracene (6) is described. The crystal structure of 4 reveals the configuration of the double bonds and the conformation of the macrocycle. Related findings come from the 1H-NMR spectroscopic characterization of 4 and 6 in solution. The spin density distribution of the radical anions 4-· and 6-· is interpretet in terms of the singly occupied molecular orbital and of the prevailing geometry. In contrast to 4, compund 6 proves to be an efficient electron acceptor since it can even be reduced to a tetraanion salt. The complete redox sequence is characterized by NMR and ESR spectroscopy.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200905
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  • 10
    Electronic Resource
    Electronic Resource
    Komplexe mit einem pentakoordinierten Kohlenstoffatom, IV. Tricarbonyl(η5-2,3-dihydro-1H-1,3-diborol)eisen und Bis[(tricarbonyleisen)-μ-(η5-2,3-dihydro-1H-1,3-diborol-2-yl)]eisen-Komplexe (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1511-1514 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complexes with a Pentacoordinated Carbon Atom, IV. -Tricarbonyl (η5-2,3-dihydro-1 H-1,3-diborole)iron and Bis[(tricarbonyliron)-μ(η5-2,3-dihydro-1H-1,3-diborol-2-yl)]iron ComplexesTricarbonylbis(cis-cyclooctene)iron reacts with the 2,3-dihydro-1H-1,3-diborole derivative 1a to yield the complex 3a, whereas with 1b the paramagnetic tetradecker complex 4b is formed. 4a is obtained from the iron sandwich 5a and Fe(CO)5. Spectroscopic data of 3a are in agreement with a pentacoordination at C-2. The X-ray structure analysis of 4b reveals a trans arrangement of the bridging ligands.
    Notes: Tricarbonylbis(cis-cycloocten)eisen reagiert mit dem 2,3-Dihydro-1H-1,3-diborol-Derivat 1a zu dem Komplex 3a, während mit 1b der paramagnetische Tetradecker-Komplex 4b entsteht. 4a wird aus dem Eisensandwich 5a und Fe(CO)5 erhalten. Spektroskopische Daten von 3a sind in Einklang mit einer Pentakoordination an C-2. Die Röntgenstrukturanalyse von 4b ergibt eine trans-Anordnung der Brückenliganden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200908
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