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  • 1980-1984  (11)
  • 1955-1959
  • 1840-1849
  • Inorganic Chemistry  (9)
  • Detergents  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    SANS-measurements on micellar solutions of perfluoro-detergents (1982)
    Springer
    Colloid & polymer science 260 (1982), S. 435-443 
    Details
    ISSN: 1435-1536
    Keywords: Detergents ; Micelles ; Short Range Order ; Neutron Scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small-angle-neutron-scattering-(SANS)-measurements were carried out with soulutions of Tetramethylam-moniumperfluoroctanesulfonate (TMAFOS) and Diethylammoniumperfluorononanoate (DEAFN) in pure D2O and in mixtures of D2O and H2O. For the TMAFOS-solutions the experimentally observed scattering functions, i.e. the coherent scattering intensity as a function of the scattering angles, could be fitted very well for large scattering angles with the theoretically calculated scattering function for rodlike particles and the dimensions of the rods could be evaluated from these fits. The radius of the rods was independent of the detergent concentration and equal to the double length of a detergent molecule. For small scattering angles the scattering function showed a maximum which was due to nearest neighbour order between the aggregates resulting from the intermicellar interaction. From this maximum a mean distance between the aggregates and hence the lengths L of the rods could be calculated. For the DEAFN-solutions the observed scattering function showed no maximum what clearly indicates the absence of nearest neighbour order between the aggregates. The experimentally observed scattering functions could not be fitted on the basis of rodlike aggregates, but agreed rather well with the theoretically calculated scattering functions for disclike aggregates and also for vesicle-like double layers. The dimensions for the discs could be evaluated from the fits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448149
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  • 2
    Electronic Resource
    Electronic Resource
    Small angle neutron scattering measurements on micellar solutions of perfluor detergents (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 1043-1049 
    Details
    ISSN: 1435-1536
    Keywords: Detergents ; micelles ; vesicles ; neutron scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Small angle neutron scattering experiments (SANS) were carried out with solutions of the Lithium salt of Perfluoroctanoic acid (LIPFO) in pure D2O and mixtures of D2O and H2O and Diethylammoniumperfluorononanoate (DEAFN). For LIPFO the scattering intensity as a function of the scattering angles could be fitted with calculated scattering functions for spheres. The contrast variation method allowed us to extract accurate values for the radius, the concentrations of the micelles and the aggregation number. For DEAFN the observed scattering function could be fitted on the basis of spherical vesicles with an appreciable variance in diameter. For several solutions these parameters and the concentration of the vesicles could be evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421713
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of α,β-Unsaturated and Other Reactive Acyl Cyanides (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3880-3885 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesen von α,β-ungesättigten und anderen reaktiven AcylcyanidenReaktive aliphatische Acylcyanide (1-10, siehe Tab. 1) werden aus Acylchloriden, Natriumiodid und Kupfer(I)-cyanid unter verschiedenen Bedingungen dargestellt. Die Reaktion verläuft über die Acyliodide.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151219
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  • 4
    Electronic Resource
    Electronic Resource
    2,2,4,4-Tetramethyl-3-methylenebicyclo[3.2.1]oct-6-ene (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 3325-3329 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,2,4,4-Tetramethyl-3-methylenbicyclo[3.2.1]oct-6-enDie sterisch anspruchsvolle Titelverbindung 1 wurde in einer Eintopfreaktion aus Cyclopentadien und 2,4-Dimethyl-3-[(trimethylsilyl)methyl]-3-penten-2-ol (5) in Gegenwart von Titantetrachlorid/N-Methylanilin hergestellt. 2,2,4,4-Tetramethylbicyclo[3.2.1]oct-6-en-3-on (4) wurde vereinfacht im 15-g-Maßstab dargestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841171117
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  • 5
    Electronic Resource
    Electronic Resource
    A new approach to dehydrocamphenilone and camphenilone (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 1256-1258 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine neue Darstellung von Dehydrocamphenilon und CamphenilonBenzilsäureumlagerung von Dehydrocarbocamphenilon (4) ergibt die α-Hydroxysäure 5, welche mit Bleitetraacetat oxidativ zu Dehydrocamphenilon (2) decarboxyliert wird. Die gleiche Reaktionsfolge führt von Carbocamphenilon (9) zu Camphenilon (3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150342
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  • 6
    Electronic Resource
    Electronic Resource
    Notizen. The Synthesis of Iodoglyoxalic Esters. Cleavage of Tetrahydrofuran and 1,2-Dimethoxyethane (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 408-412 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Synthese von Iodglyoxylsäureestern. Spaltung von Tetrahydrofuran und 1,2-DimethoxyethanEine Serie von Iodglyoxylaten 2a - i wird aus Chlorglyoxylaten 1a - i und Natriumiodid in Acetonitril dargestellt und durch Tieftemperaturextraktion mit Pentan isoliert. Iodglyoxylsäureester eignen sich zur acylierenden Spaltung von Ethern, z. B. Tetrahydrofuran und 1,2-Dimethoxyethan.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170132
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  • 7
    Electronic Resource
    Electronic Resource
    Cycloadditions of Allyl Cations, 29. Acid Catalyzed Reactions of 2,3-Dimethyl-3-penten-2-ol and Cyclopentadiene in Two Phases. Formation of Seven- and Five-membered Rings (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2898-2906 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditionen von allyl-Kationen, 29. Säurekatalysierte Reaktionen von 2,3-Dimethyl-3-penten-2-ol mit Cyclopentadien in zwei Phasen. Bildung von sieben- und fünfgliedrigen Ringen2,3-Dimethyl-3-penten-2-ol (3) und Cyclopentadien wurden in verdünnter wäßriger Sulfonsäure/Pentan Gerührt. Es bildeten sich 2,3,4,4-Tetramethylbicyclo[3.2.1]octa-2,6-dien (4), die epimeren 3-Methylen-Isomeren 5a, b und zum ersten Mal auch ein fünfgliedriger Ring, nämlich 2,3,4,4-Tetramethylbicyclo[3.3.0]octa-2,6-dien (6) mit 69 - 73% Gesamtausbeute. Das bicyclische Dien 4 war Hauptprodukt und wurde leicht als kristallisierter Silbernitratkomplex (C12H18)2·AgNO3 isoliert (41-44%). In einem modifizierten Verfahren wurde die Zweiphasenreaktion bei 0°C ausgeführt. Anschließend wurden die resultierenden Alkohole chromatographisch abgetrennt und bei 50°C cyclisiert. Diese Variante ergab einen höheren Anteil des thermodynamisch stabileren, neuartigen [3.3.0]-Bicyclus 6 (4:6 = 2.6:1).
    Notes: 2,3-Dimethyl-3-penten-2-ol (3) and cyclopentadiene were stirred in dilute aqueous sulfonic acid/pentane, giving 2,3,4,4-tetramethylbicyclo[3.2.1]octa-2,6-diene (4), the epimeric 3-methyl-ene isomers 5a, b and, for the first time, also a five-membered ring, namely 2,3,4,4-tetramethylbicyclo[3.3.0]octa-2,6-diene (6) in 69 - 73% overall yield. The major bicyclic diene 4 was conveniently isolated as crystalline silver nitrate complex (C12H18)2·AgNO3 (41 - 44%). In a modified approach the two phase reaction was carried out at 0°C, the resulting alcohols were separated by chromatography and cyclized at 50°C, giving an increased proportion of the thermodynamically more stable, novel [3.3.0] bicyclic isomer 6 (4:6 = 2.6:1)
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140820
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  • 8
    Electronic Resource
    Electronic Resource
    Cycloadditions of allyl cations, 22. Allyl alcohols as precursors of allyl cations (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 3837-3847 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditionen von Allyl-Kationen, 22. Allylalkohole als Vorläufer für Allyl-KationenAllylalkohole wie 3-Ethoxy-2-methyl-3-buten-2-ol (4), der silylierte Alkohol 8 sowie 2-Methyl-3-pentin-2-ol (12) werden in die entsprechenden Trifluoressigsäureester (5, 9, 13) übergeführt und in Gegenwart von Zinkhalogenid/Ethyldiisopropylamin und eines konjugierten Diens in guten bis sehr guten Ausbeuten in verbrückte Siebenringe (14, 16, 18, 20-24) umgewandelt. Demnach reagiert 5, anders als alle bisher untersuchten Oxyallyl-Vorläufer, unter den beschriebenen Bedingungen zum verbrückten 1-Ethoxy-1,4-cycloheptadien (14, 16, 18, 20) statt zum thermodynamisch stabileren 4-Cyclohepten-1-on (15, 17, 19, 21), welches aus dem anfänglich gebildeten cyclischen Enolether durch Hydrolyse entsteht. Es wird geschlossen, daß jetzt strukturell komplexe Allyl-Kationen unter schonenden Bedingungen erzeugt werden können, dank der Gegenwart von Ethyldiisopropylamin sogar in schwach alkalischem Medium.
    Notes: Allyl alcohols such as 3-ethoxy-2-methyl-3-buten-2-ol (4), the silylated alcohol 8 and also 2-methyl-3-pentyn-2-ol (12) have been converted into the corresponding trifluoroacetates (5, 9, 13), which in the presence of zinc halide/ethyldiisopropylamine react with conjugated dienes to form bridged seven-membered rings (14, 16, 18, 20-24) in good to excellent yields. Thus, unlike all other oxyallyl precursors studied so far, 5 gives the bridged 1-ethoxy-1,4-cycloheptadiene (14, 16, 18, 20) under the present conditions rather than the thermodynamically more stable 4-cyclohepten-1-one (15, 17, 19, 21) which is formed from the initial enol ether by hydrolysis. It is concluded that structurally complex allyl cations can now be generated in very mild conditions, and owing to the presence of ethyldiisopropylamine, even in weakly alkaline solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801131216
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  • 9
    Electronic Resource
    Electronic Resource
    Cycloadditions of allyl cations, 25. Acid catalyzed dehydrative cyclodimerization of 2,4-dimethyl-3-penten-2-ol in two phases. Biomimetic one-pot preparation of 3,3,5,5-tetramethyllimonene (4-isopropenyl-1,3,3,5,5-pentamethyl-1-cyclohexene) (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 1182-1186 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cycloadditionen von Allyl-Kationen, 25. Säurekatalysierte dehydrative Cyclodimerisierung von 2,4-Dimethyl-3-penten-2-ol in zwei Phasen. Biomimetische Eintopfdarstellung von 3,3,5,5-Tetramethyllimonen (4-Isopropenyl-1,3,3,5,5-pentamethyl-1-cyclohexen)2,4-Dimethyl-3-penten-2-ol (1) wurde in einer Mischung von wäßriger Sulfonsäure/Pentan bei Raumtemperatur gerührt. Es bildete sich 3,3,5,5-Tetramethyllimonen (2) in hoher Ausbeute. 2 wurde in sein Epoxid (3) (4-Isopropenyl-1,3,3,5,5-pentamethyl-7-oxabicyclo[4.1.0]heptan) umgewandelt.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140336
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  • 10
    Electronic Resource
    Electronic Resource
    Cycloadditions of Allyl Cations, 281) Novel Diels-Alder Additions via Acid Catalyzed Reactions of 4-Methyl-3-penten-2-ol with Cyclopentadiene and Cyclohexadiene in Two Phases. Formation of Monocyclic, Bicyclic, and Tricyclic Adducts and Double Fragmentation of a Norbornenylcarbinol (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2208-2216 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloadditionen von Allyl-Kationen, 281) Neuartige Diels-Alder-Additionen: säurekatalysierte Reaktionen von 4-Methyl-3-penten-2-ol mit Cyclopentadien und Cyclohexadien im Zweiphasensystem. Bildung von monocyclischen, bicyclischen und tricyclischen Addukten und Doppelfragmentierung eines Norbornenylcarbinols4-Methyl-3-penten-2-ol (1) und Cyclopentadien reagieren in einem sauren Zweiphasensystem bei 0°C unter Bildung von Allylcyclopentenolen 2 und Norbornenylcarbinolen 4. Bei 50°C und unter ähnlichen Bedingungen werden 2 und 4 in Allylcyclopentadiene 3, bicyclische Olefine 5 und 6 sowie in den tricyclischen Ether 7 umgewandelt. Mit einem vergleichsweise reaktiven Dehydratisierungsagens (SOCl2/Pyridin) erleidet das Norbornenylcarbinol 4 eine doppelte Fragmentierung unter Bildung dimerer Diene C12H20, welche unabhängig durch säurekatalysierte dehydrative Dimerisierung des Allylalkohols 1 erhalten wurden. - Die endo/exo-Selektivität der Bildung der epimeren Norbornenylcarbinole 4 aus Cyclopentadien und 1 und die der AlCl3-katalysierten Cycloaddition von 2-Butensäure-methylester und Cyclopentadien sind gleich (13:1). Die säurekatalysierte Zweiphasenreaktion von Cyclohexadien und 1 bei Raumtemperatur gibt das Substituierte Bicyclo[2.2.2]octen endo-13 mit 19 - 23 Ausbeute.
    Notes: 4-Methyl-3-penten-2-ol (1) and cyclopentadiene react in an acidic two phase system at 0°C to form allylcyclopentenols 2 and norbornenylcarbinols 4. At 50°C and under similar conditions, 2 as well as 4 are equilibrated to allylcyclopentadienes 3, bicyclic olefins 5 and 6, and tricyclic ether 7. With a comparatively reactive dehydrating agent (SOCl2/pyridine), norbornenylcarbinol 4 suffers double fragmentation to give dimeric dienes C12H20, which were also obtained independently by acid catalyzed dehydrative dimerization of allyl alcohol 1. - The endo/exo selectivity for the formation of epimeric norbornenylcarbinols 4 from cyclopentadiene and 1 is similar to that of the AlCl3-catalyzed cycloaddition of methyl 2-butenoate und cyclopentadiene (13:1). The acid catalyzed two phase reaction of cyclohexadiene and 1 at room temperture gives the substituted bicyclo[2.2.2]octene endo-13 in 19 - 23% yield.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140618
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