ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Organic Chemistry  (1.364)
  • Animals  (860)
  • 1995-1999
  • 1980-1984  (2.224)
  • 1975-1979
  • 1982  (1.138)
  • 1980  (1.086)
Sammlung
Erscheinungszeitraum
  • 1995-1999
  • 1980-1984  (2.224)
  • 1975-1979
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 964-972 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Investigations on the Thermal Decomposition of n-Dodecylcyclopentane in the Gas PhaseIn the thermal decomposition of n-dodecylcyclopentane at 670 and 750°C in a laboratory tubular reactor mixtures of hydrogen and 57 and 113 hydrocarbons respectively are formed. The mixtures have been analyzed and identified by capillary gas chromatography and by mass spectrometry. The distribution of the reaction products is used for mechanistic discussions.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The conjugate addition of the chiral, non-racemic alkoxy-enolates 5 and 6 to nitroolefins furnishes the hydroxynitroesters 7-13, which are catalytically hydrogenated to give the lactams 14-18. The configuration of adduct 7 from nitroethylene was elucidated by NMR. analysis of the acetal 20 derived from 7. The assignment establishes that the reaction follows the stereochemical rule of attack depicted in 21 and previously deduced for other electrophiles, i.e. formation of erythro-products of type 3b and 4b. No stereocontrol was found at the newly formed chiral centers in α- and β-position to the NO2 group of 8-12.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The protonation and deprotonation rates of the coordinated amide groups in the Cu2+-complexes of 1,8-diamino-3,6-diaza-2,7-octanedione (DED = L) have been studied by stopped-flow techniques. Starting at low pH from Cu2+ and DED the dimeric Cu2L24+-complex, fully formed within the mixing time of the stopped-flow instrument, reacts in two consecutive steps to yield the final product CuLH-2. The rate constants of the forward and backward reactions have been determined and are given in Table 1. The intermediate was identified as Cu2L2H-22+ by measuring its VIS.-absorption spectrum.The rate constants for the interconversion of the amide groups from the O- to the N-coordinated form in the Cu2+-complexes of DED, 2,10-dioxo-1, 4, 8, 11 tetraazaundecane (DANA) and triglycine (TRIGLY) are compared with each other. It is shown that these rate constants are similar, no matter whether the amide group is terminal or internal as long as the rotation is easily possible as is the case in the dimeric species Cu2L24+ and Cu2L2H-22+. However, for CuLH-2 the inter-conversion only takes place after opening of one of the chelate rings in a rapid protonation preequilibrium.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1366-1374 
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Synthesis of cis- and trans-Enynes in the Class of 12- and 15-membered Ring SystemsSynthesis of (E)-1-cyclododecen-3-yne (E-2a) leads to the isolation of the first trans-enyne with geometrical ring strain. E-2a isomerizes thermally to give the Z-configuration Z-2a in a very smooth reaction. For systematical investigations the 15-membered ring enynes E-5a and Z-5a were generated. They behave like openchained 1,3-enynes.
    Notizen: Die Synthese von (E)-1-Cyclododecen-3-in (E-2a) führt zur Isolierung des ersten trans-Enins mit geometrischer Ringspannung. E-2a wandelt sich thermisch leicht in die Z-Konfiguration Z-2a um. Zur systematischen Untersuchung werden die 15-Ring-Enine E-5a und Z-5a hergestellt. Sie verhalten sich wie offenkettige 1,3-Enine.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The photochemical synthesis of the title complex from 1,3-butadiene and dodecacarbonyltriosmium is described. The 1H-NMR. and H-coupled 13C-NMR. spectra are analyzed completely and the H, H- and C,H-coupling constants compared with the data of the corresponding Fe- and Ru-complexes. One-bond 13C, 13C-coupling constants are reported for a series of complexed 1,3-dienes. All data are consistent with an increasing distortion from planarity of the C,H-skeleton at the terminal diene C-atoms in the sequence Fe → Ru → Os.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 683-698 
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Bromination and Dehydrobromination in the Side Chains of 1,2,3-ThiadiazolesThe bromination of 1,2,3-thiadiazoles with N-bromosuccinimide (NBS) is investigated. The monobromides 3 and 4 and the dibromides 5 and 6 can be isolated. Several methods have been used for the introduction of double bonds by the elimination of HBr. Besides the elimination products 9, 11, 12, and 14 the substitution products 10, 13, 15, 16, and 17 are obtained. A lot of regio- and stereoselectivities can be observed.
    Notizen: Bei den 1,2,3-Thiadiazolen 2a-h wird die Bromierung mit N-Bromsuccinimid (NBS) untersucht. Es können die Monobromide 3 und 4 sowie die Dibromide 5 und 6 isoliert werden. Zur Einführung von Doppelbindungen unter HBr-Abspaltung werden mehrere Verfahren geprüft. Neben den Eliminierungsprodukten 9, 11, 12 und 14 erhält man die Substitutionsprodukte 10, 13, 15, 16 und 17. Man beobachtet dabei eine Reihe von Regio- und Stereoselektivitäten.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 750-753 
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The crystal structure of 4-trimethyltin-quinuclidinium perchlorate has been determined by direct methods and refined by least squares techniques. Crystals of C10H22ClNO4Sn are monoclinic, space group I2/c with lattice parameters a = 29.445 (13), b = 18.400(8), c = 11.300(5) Å, β = 95.82(5)°, V = 6090.65Å3, and two independent molecules (Z = 16), Interatomic distances are compared with those of known structures of quinuclidinium chloride and 4-haloquinuclidinium chlorides and perchlorates.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 754-760 
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Synthesis, Crystal Structure, and Magnetic Properties of Bis(1,2-benzoquinonediimide)-1,2-benzosemiquinonediimidocobalt (II)-tetraphenylborate-pentahydrateCo (II)-salts catalyze the autoxidation of 1,2-diaminobenzene in slightly alkaline solution. Deeply coloured metal complexes are formed during the reaction suggesting intermediate radical or semiquinonediimide stages of the aromatic ligands. Starting from [CoII (1,2-diaminobenzene)3] (ClO4)2 two different intermediate complexes can be isolated, the magnetic properties of which point to a high-spin cobalt (II)-complex and a low-spin cobalt (II)-complex with a radical ligand respectively. The X-ray structure determination of the latter complex yielded a square pyramidal arrangement, the Co-N4-plane distance being only 0.5 Å. The dark blue coloured complex is diamagnetic. Two of the aromatic ligands have the oxidation state of a benzoquinonediimide while the third, coordinated by one amino group only, is pseudosemiquinonoid. Crystals of C42H48BCoN6O5 are monoclinic, a = 14.493 (5), b = 18.341 (7), c = 15.492 (5) Å, β = 99.198 (5), space group P21/n. Dobs. = 1.290, Dcalc. = 1.289 g/cm3 for Z = 4. The structure was solved by Patterson's method and refined by least-squares techniques to R = 0.088 for 2866 of 5014 independent reflexions.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1870-1890 
    ISSN: 0170-2041
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Glycosyl Azides as Starting Materials for the Synthesis of Nucleoside Analogues, 2.  -  Synthesis of Tetrazole NucleosidesThe β-D-ribofuranosyl azide derivative 1 as well as the corresponding α-anomeric compound 3 yield via Staudinger reaction the same P-N-ylide 2. Treatment with alkyl isocyanates RNCO [R = CH3, (CH3)2CH, C2H5OCOCH2, (S)-C2H5OCOCH(CH3)] affords the diastereomeric carbodiimide derivatives 5 which can be transformed by HN3 regioselectively into the 1-(β-ribofuranosyl)-5-(alkylamino)tetrazole derivatives 6. Partial or total removal of the protecting groups affords the products 7a, c, d, and 7d′-d′". The β-D-mannofuranosyl azide derivative 8 is converted via the P-N-ylide 9 into the carbodiimide 10 and the aminotetrazole derivative 11. The reaction of 2 with phenyl isocyanate yields the 5-[(β- and 5-[(α-D-ribofuranosyl)amino]-1-phenyltetrazoles 18 and 19 passing the carbodiimide intermediates 12 and 13. Additionally the 1-isocyanato sugar derivatives 14 and 15 arise which provide for the formation of the products 16, 17, and 20-22. The ethyl [(β-D-ribofuranosyl)-5-tetrazolyl]acetate 23 is formed by reaction of 2 with the azide of monoethyl malonate. The preparation of the ribosyltetrazole derivatives 26 and 27 can be achieved only by preceding synthesis of the syn/anti mixture 24a/24a originating from 2 and acetyl cyanide followed by treatment with HN3. The α-ribosyliminonitrile 25 is assumed to be an intermediate.
    Notizen: Sowohl das β-D-Ribofuranosylazid 1 als auch das α-Anomere 3 liefern bei der Staudinger-Reaktion das gleiche P-N-Ylid 2. Mit Alkylisocyanaten RNCO [R - CH3, (CH3)2CH, C2H5OCOCH2 und (S)-C2H5OCOCH(CH3)] entstehen die Carbodiimidderivate als Diastereomerengemische 5, welche mit HN3 in die 1-(β-Ribofuranosyl)-5-(alkylamino)tetrazole 6 umgewandelt werden. Teilweise oder gänzliche Entfernung der Schutzgruppen führt zu den Produkten 7a, c, d und 7d′-d′". Vom β-D-Mannofuranosylazidderivat 8 aus gelangt man über das P-N-Ylid 9 zum Carbodiimidderivat 10 und schließlich zum Aminotetrazolderivat 11. Die Umsetzung von 2 mit Phenylisocyanat liefert die 5-[(β- und 5-[(α-D-Ribofuranosyl)amino]-1-phenyltetrazole 18 bzw. 19 über die Carbodiimidzwischenstufen 12 und 13. Ferner entstehen die 1-Isocyanatozuckerderivate 14 und 15, welche für die Entstehung der Folgeprodukte 16, 17 und 20-22 verantwortlich sind. Aus 2 und Malonsäure-monoethylester-azid entsteht das Nucleosidderivat 23. Die Darstellung der Ribosyltetrazole 26 und 27 aus 2 läßt sich nur mit Acetylcyanid über das syn/anti-Gemisch 24a/24a′ durch Umsetzung mit HN3 verwirklichen. Als Zwischenstufe wird das (α-Ribosylimino)nitril 25 postuliert.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 1048-1067 
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Introduction of Magnesium into Ligands of the Chlorophyll Series by (2,6-Di-t-butyl-4-methylphenoxy)magnesium IodideExperimental details are given for the new method of introducing magnesium into porphinoid ligands by (2,6-di-t-butyl-4-methylphenoxy)magnesium iodide (1), previously published in preliminary form [1]. Besides magnesium octaethylporphyrinate (14), methyl pyrochlorophyllide a (10), methyl chlorophyllide a (8), and methyl bacteriochlorophyllide a (12), the complexation of pheophytin a (2) to chlorophyll a (3) and of pheophytin b (4) to chlorophyll b (5) are described.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...