GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Triphenylpyrylium Tetrafluoroborate-Sensitized Photochemistry of the Terpenes Sabinene, α-Phellandrene, and α- and γ-Terpinene (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1563-1567 
    Details
    ISSN: 1434-193X
    Keywords: Triplet recombination ; Electron transfer ; Radical ions ; Photochemistry ; Terpenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The triphenypyrylium tetrafluoroborate (TPT)-sensitized reactions of several terpene donor molecules, including sabinene (1), α-phellandrene (4), α-terpinene (5) and γ-terpinene (6) give rise to significantly different products than reactions induced by other electron-transfer sensitizers, such as 1,4-dicyanobenzene (DCB). The divergent reactions require decidedly different key intermediates; the products obtained with TPT can be explained by dissociative recombination of the intermediate radical-radical cation pair in the triplet state, generating donor-derived biradicals.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Dual Behavior of ZSM-5 as Brønsted Acid and Electron Acceptor in the Adsorption of N,N′-Diphenylhydrazine (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 473-477 
    Details
    ISSN: 1434-193X
    Keywords: Zeolites ; Electron transfer ; Proton transfer ; Radical ions ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Incorporation of N,N′-diphenylhydrazine into HZSM-5 led to the formation of azobenzene and aniline (70-80 mol-% mass balance). The formation of azobenzene can be followed by the appearance in diffuse reflectance UV/Vis spectroscopy of a characteristic band (λmax = 420 nm). IR spectra of the extracted solids indicate that some aniline is retained in the zeolite, probably due to acid-base interaction with active sites. The products are rationalized by two competing mechanisms: the formation of azobenzene by electron transfer to an oxidizing site, the generation of aniline by proton transfer from a Brønsted acid site. A long-wavelength diffuse-reflectance band (λmax = 800 nm) in the initial stages of the reaction supports the intermediacy of a radical cation. These results show that acid zeolites can exhibit a dual behavior against basic substrates with low oxidation potential, serving simultaneously as electron acceptor and Brønsted acid.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Oxidation of Aryl- and Diarylcyclopropanes in a Pentasil Zeolite: Ring Opening with Deprotonation or Net Hydrogen Migration (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 467-472 
    Details
    ISSN: 1434-193X
    Keywords: Zeolites ; Radical ions ; Ring opening ; Electron transfer ; Oxidations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Incorporation of trans-1,2-diphenylcyclopropane (1) and its 3,3-D2-isotopomer into the channels of a redox-active pentasil zeolite (Na-ZSM-5) resulted in the formation of exo,exo-1,3-diphenylallyl radical (2•) and its 2-D1 isotopomer, respectively. This conversion requires oxidation, ring opening, and deprotonation, in an unspecified sequence. The allyl radical 2• is also formed upon incorporation of trans-1,3-diphenylpropene (3). A comparison with the solution photochemistry, in the presence or absence of added base, shows the conversion of 1 into 2• to be a zeolite-specific reaction. Incorporation of arylcyclopropanes 9 (R = H, OCH3) into ZSM-5 generated trans-propenylbenzene radical cations 10•+ (R = H, OCH3); the 2,2-D2 isotopomer of 9 (R = OCH3) gave rise to three different isotopomers of 10•+ (R = OCH3).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    4-Amino-7-(β-D-arabinofuranosyl)pyrrolo[2,3-d]pyrimidin  -  die Synthese von Ara-Tubercidin durch Phasentransferkatalyse (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2069-2080 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 4-Amino-7-(β-D-arabinofuranosyl)pyrrolo[2,3-d]pyrimidine  -  the Synthesis of Ara Tubercidin by Phase Transfer Catalysis4-Chloro-2-methylthio-7H-pyrrolo[2,3-d]pyrimidine (6e) and 1-bromo-2,3,5-tri-O-benzyl-D-arabinofuranose (7) react in the presence of benzyltriethylammonium chloride as phase transfer catalyst to give the nucleoside derivatives 8/9a in 85% yield. The latter were separated chromatographically, and the ratio of the anomers was determined to 8:2 (β: α). 9a was converted into 9d by ammonolysis and the desulfurisation, yielding 9e, was accomplished with raney nickel. The benzyl protecting groups in 9e, are split off by catalytic hydrogenation, and crystalline 4-amino-7-(β-D-arabinofuranosyl)pyrrolo[2,3-d]pyrimidine (3) was obtained after ion exchange chromatography. 7-Deaza-Ara A (3) is in contrast to Ara-A (1) not deaminated by adenosine deaminase.
    Notes: Aus 4-Chlor-2-methylthio-7H-pyrrolo[2,3-d]pyrimidin (6e) und 1-Brom-2,3,5-tri-O-benzyl-D-arabinofuranose (7) können durch Phasentransferkatalyse mit Benzyltriethylammoniumchlorid die Nucleosidderivate 8/9a in 85proz. Ausbeute erhalten werden. Diese werden chromatographisch getrennt und deren Anomerenverhältnis (β: α) mit 8:2 bestimmt. Durch Ammonolyse von 9a entsteht 9d; Entschwefelung von 9d mit Raney-Nickel führt zu 9e, dessen Benzylschutzgruppen durch katalytische Hydrierung abgespalten werden. Nach Ionentauscherchromatographie erhält man kristallisiertes 4-Amino-7-(β-D-arabinofuranosyl)pyrrolo[2,3-d]pyrimidin (3), das im Gegensatz zum virostatisch aktiven Ara-A (1) durch Adenosin-Desaminase nicht desaminiert wird.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130603
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Über Struktur und Eigenschaften von Phosphor(III/V)-oxiden (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 336 (1965), S. 137-155 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The phosphorus oxide hitherto described as “(PO2)n” is shown to be a phosphorus(III, V) oxide of the composition P4O8 having a molecular structure resembling those of P4O6 and P4O10. The existence of a further structure analogue oxide, P4O9, is proved, and evidence is given for an oxide consisting of P4O7 molecules.Without any change of the P4O9 (α-)lattice structure, P4O8 molecules can be successively substituted for P4O9 molecules up to a 90 percent substitution. There is evidence for an analogue substitution of P4O7 for P4O8 molecules within the P4O8 (β-)lattice.The phosphorus(III, V) oxides have been prepared either by thermal decomposition of P4O6 or by reacting P4O10 and P(III, V) oxide, respectively, with red phosphorus.
    Notes: Das früher beschriebene „(PO2)n“ stellt ein Phosphor(III/V)-oxid der Zusammensetzung P4O8 dar und besitzt eine dem P4O6 bzw. dem P4O10 analoge Struktur. Darüber hinaus wird die Existenz eines weiteren strukturanalogen Phosphor(III/V)-oxides, P4O9, bewiesen und die des Phosphor(III/V)-oxides P4O7 wahrscheinlich gemacht.Die Kristallgitterstrukturen von P4O9 und P4O8 ähneln sich sehr. Ohne Änderung der Gitterstruktur können im P4O9-Gitter, dem α-Phosphor(III/V)-oxid-Gitter, bis zu 90% der P4O9-Molekeln durch P4O8-Molekeln kontinuierlich ersetzt werden. Ein analoger kontinuierlicher Ersatz der P4O8-Molekeln im P4O8-Gitter (β-Phosphor(III/V)-oxid-Gitter) durch P4O7-Molekeln scheint möglich zu sein. Phosphor(III/V)-oxide sind außer durch thermische Zersetzung von Phosphor(III)-oxid durch Reaktion zwischen Phosphor(V)-oxid, P4O10, bzw. Phosphor(III/V)-oxid und rotem Phosphor darstellbar.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19653360304
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Zur Umsetzung von Phosphor-Tetrachlorkohlenstoff-Suspensionen mit Sauerstoff (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 378 (1970), S. 37-48 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Colourless phosphorus is volatile with CCl4 vapour. In the presence of oxygen, phosphorus vapour in gaseous CCl4 is only oxidised to a negligible extent. Quenching of phosphorus/CCl4 vapour mixture results in the formation of conglomerates of colourless phosphorus having molar masses up to 8200 (≙ 66 P4 molecules). Such conglomerates are oxidised by oxygen. The oxidation products exhibit an atomic ration P : 0 ≍ 2 : 3 being, however, no polymeric forms of P4O6 (as supposed by BLASER), but probably polymeric cross  -  linked mixed oxides with a statistical oxygen distribution.
    Notes: Farbloser Phosphor ist mit Tetrachlorkohlenstoff dampfflüchtig. Mit Sauerstoff erfolgt in Gegenwart von Tetrachlorkohlenstoffdampf nur eine unwesentliche Oxydation des Phosphordampfes. Beim Abschrecken des Dampfgemisches bilden sich Konglomerate von farblosem Phosphor entsprechend mittleren Teilchengewichten bis zu 8200. Solche Konglomerate werden durch Sauerstoff oxydiert, Die Oxydationsprodukte zeigen ein Phosphor-Sauerstoffverhältnis von ca. 2 : 3. Sie sind nicht, wie BLASER annahm, Polymere des Phosphor(III)-oxid, P4O6, sondern stellen wahrscheinlich polymere, vernetzte Mischoxide mit statistischer Sauerstoffverteilung dar.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703780105
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Zur Darstellung von Phosphor(III, V)-oxiden: β-Phase P4O7-P4O8 (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 120-129 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The previously suggested end member P4O7 of the beta;hyphen;phase structure type of phosphorus (III,IV) oxides as well as the mixed-crystal β-phase P4O7-P4O8 have been prepared by oxidation of phosphorus(III) oxide dissolved in carbon tetrachloride. Without alteration of the crystal structure type, P4O7 and P4O8 molecules are mutually exchangeable in the phase range P4O7-P4O7,9, the density of such mixed crystals being strictly determined by the mean composition.The crystal structure of the β-phase is obviously fixed by the P4O7 molecular structure and not, as previously supposed, by that of the P4O8 molecules. The latter appear to occur in the pure state as, in general, amorphous substances.
    Notes: Das früher vermutete strukturanaloge Endglied P4O7 der β-Phase von Phosphor)III, V(-oxiden kann ebenso wie die β-Mischkristallphase P4O7-P4O8 durch Oxydation von in Tetrachlormethan gelöstem Phosphor(III)-oxid dargestellt werden. Ohne Änderung der Kristallgitterstruktur sind P4O7- und P4O8-Molekeln im Phasenbereich P4O7-P4O7,9 kontinuierlich gegeneinander austauschbar. Die Dichte der Mischkristalle ändert sich dabei gesetzmäßig mit der mittleren Zusammensetzung.Die Kristallstruktur der β-Phase wird offensichtlich durch die Struktur der P4O7-Molekeln bestimmt und nicht, wie früher angenommen, durch die der P4O8-Molekeln. Letztere scheinen in reiner Form im allgemeinen amorphe Substanzen zu bilden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713830203
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Über die Hydrolyse des Phosphor(III)-chlorides, -bromides und -jodides (1955)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 281 (1955), S. 303-321 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch chromatographische und jodometrische Analyse wird gezeigt, daß bei der Hydrolyse von PCl3 unter milden Bedingungen bis zu ∼75% des dreiwertigen Phosphors, P(III), in Pyrophosphit übergehen, welches sich aus primär entstehendem Phosphit und PCl3 bildet. Außerdem entstehen, besonders in alkalischem Medium, neben PH3, Diphosphit, Subphosphat, bisher nicht bekanntes iso-Subphosphat, Phosphat, Di-, = Pyrophosphat und eine „zweite neue Verbindung“ mit 3 oder 4 P-Atomen und mindestens je einer (P—O—P)- und (P—P)-Bindung im Molekül. Die Hydrolysate von PBr3 und PJ3 in NaHCO3-Lösung sind reicher an Verbindungen mit (P—P)-Bindung als die des PCl3. Durch die Pyrophosphitbildung erklärt sich das bisher rätselhafte „Oxdationsdefizit“ bei der Jodoxydation der PCl3-Hydrolysate in Hydrogencarbonatlösung. Die Suche nach einer α- oder Orthophosphorigen Säure P(OH)3 verlief bisher ergebnislos.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19552810507
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Zur Darstellung von Phosphor(III)-oxid (1966)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 347 (1966), S. 167-174 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A preparation method(1) for phosphorus(III) oxide with 35-45% yields is described allowing the continuous combustion of colourless phosphorus by means of an N2O current at 50-90 mm Hg. Further methods, as the oxidation of P4 in O2/N2 mixtures and interaction of PCl3 with [N(CH3)4]SO3 in liquid SO2, for preparing P(III) oxide in 5-30 g scales are checked and discussed.
    Notes: Es wird eine Methode(1) zur Darstellung von Phosphor(III)-oxid beschrieben, die es gestattet, das Oxid mit Ausbeuten zwischen 35 und 45% durch Verbrennen von farblosem Phosphor in einem Distickstoffmonoxid-Strom bei Drucken zwischen 50 und 90 mm Hg kontinuierlich herzustellen.Andere Methoden, wie Oxydation von farblosem Phosphor in Sauerstoff - Stickstoff-Gemischen und Umsetzung von PCl3 mit [N(CH3)4]2SO3 in flüssigem SO2, werden bezüglich ihrer Anwendbarkeit zur Darstellung von 5-5-30 g Phosphor(III)-oxid diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19663470309
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Anwendung von Polyelektrolyten bei der mechanischen Fest/Flüssig-Trennung (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 541-552 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Use of Polyelectrolytes in Mechanical Solids/Liquid Separation. This article shows how optimisation tasks for the dewatering of sludge can be solved by starting from studies of chemical structure and steric properties of polyelectrolytes and laboratory experiments based thereon with a trans-portable computer-aided flocculation and dewatering apparatus. The optimum polyelectrolyte dosage lies in the range of the critical concentration c* (viscosimetric measurements) of the dissolved polyelectrolytes. On optimisation of the flocculant regime for mechanical solids/liquid separation by combined addition of anionic and cationic polyelectrolytes (dual process), it is necessary to consider the overall system of sedimentation and filtration. In an industrial scale plant, the consumption of flocculant could be reduced by up to 10% compared to laboratory studies. At the same time, the dewatering behaviour could be improved by up to 60%, a shearing strength of the sludge in excess of 20 kN/m2 reliably established, and plant operating reliability achieved for changing sedimentation properties.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650507
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...