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  • Chemistry  (21)
  • Polymer and Materials Science  (9)
  • Inorganic Chemistry  (3)
  • Fruit-set  (2)
  • Parthenocarpy  (2)
  • Catecholamine and serotonine metabolism
  • entropy balance equation Boltzmann equation
  • 1980-1984  (28)
  • 1983  (9)
  • 1982  (11)
  • 1980  (8)
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Keywords
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  • 1980-1984  (28)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Copolymerization of β-pinene with styrene oxide and N-vinylpyrrolidone (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 1279-1285 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The copolymerization of β-pinene with styrene oxide (SO) and β-pinene with N-vinylpyrrolidone (VP) was investigated by using SnCl4 in dichloromethane diluent at low temperature. Monomer reactivity ratios were evaluated for both copolymers at -80°C; these are r1(SO) = 2.979 and r2(β-pinene) = 0.002 and r1(VP) = 0.096 and r2(β-pinene) = 0.294.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170200511
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  • 2
    Electronic Resource
    Electronic Resource
    Fruit-set of unpollinated ovaries of Pisum sativum L. (1980)
    Springer
    Planta 147 (1980), S. 444-450 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Auxin ; Cytokinin ; Decapitation ; Fruit-set ; Gibberellin ; Parthenocarpy ; Pisum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of removing the apical shoot and different leaves above and below the flower on the fruit-set of unpollinated pea ovaries (Pisum sativum L. cv. Alaska) has been studied. Unpollinated ovaries were induced to set and develop either by topping or by removing certain developing leaves of the shoot. Topping had a maximum effect when carried out before or on the day of anthesis, and up to four consecutive ovaries were induced to set in the same plant. The inhibition of fruit-set was due to the developing leaves and not to the apex. The third leaf above the first flower, which had a simultaneous development to the ovary, had the stronger inhibitory effect on parthenocarpic fruit-set. The application of different plant-growth regulators (indoleacetic acid, naphthylacetic acid, 2,4-dichlorophenoxyacetic acid, gibberellic acid, benzyladenine and abscisic acid) did not mimic the negative effect of the shoot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380186
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  • 3
    Electronic Resource
    Electronic Resource
    Fruit-set of unpollinated ovaries of Pisum sativum L. (1980)
    Springer
    Planta 147 (1980), S. 451-456 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Auxin ; Fruit-set ; Gibberellin ; Parthenocarpy ; Pisum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The development of parthenocarpic fruits of Pisum sativum L. cv. Alaska was induced by the application of different plant-growth regulators in aqueous solution to the emasculated ovaries in untopped plants. At least one compound in each of the groups of auxins (2,4-dichlorophenoxyacetic acid), cytokinins (benzyladenine), and gibberellins (gibberellic acid) was found active. Gibberellic acid (GA3), however, was the only substance which produced pods similar to those of fruits with seeds. The length of the pods obtained by GA3 was a linear function of the logarithm of the concentration of GA3 in the solution. The effect of GA3 (at a concentration which produced 50% of the maximum pod length) was enhanced by a simultaneous application of 2,4-dichlorophenoxyacetic acid. Abscisic acid (ABA) counteracted the effect of GA3 and of topping. The results suggest that gibberellins and ABA may exert a major regulatory control in natural fruit-set. Peas can be used for the assay of fructigenic activity and is an advantageous material for the study of the mode of action of gibberellins on fruit-set.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380187
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  • 4
    Electronic Resource
    Electronic Resource
    A kinetic derivation of extended irreversible thermodynamics (1982)
    Springer
    Journal of statistical physics 29 (1982), S. 387-396 
    Details
    ISSN: 1572-9613
    Keywords: Extended irreversible thermodynamics ; relaxation times ; constitutive equations ; conserved and nonconserved variables ; entropy balance equation Boltzmann equation ; moment method ; Burnett equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The basic postulates of the extended irreversible thermodynamics are derived from the kinetic model for a dilute monoatomic gas. Using the Grad 13-moment method to solve the full nonlinear Boltzmann equation for molecules conceived as soft spheres we obtain the microscopic expressions for the entropy flux, the entropy production, and the generalized Pfaffian for the extended definition of entropy as required by such a theory. Some of the physical implications of these results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020794
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  • 5
    Electronic Resource
    Electronic Resource
    Synthèse de spirohydantoines dérivées du diphényl-2,4-aza-3-bicyclo-[3.3.1]nonane et du diphényl-7,9-aza-8-bicyclo[4.3.1]decane par réaction de Bucherer dans la N,N-diméthylformamide: Influence de la température et cours stéréochimique. Communication préliminaireUne publication plus détaillée paraîtra ultérieurement. (1983)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 66 (1983), S. 338-341 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Spyrohydantoines Derivatives of 2,4-Diphenyl-3-azabicyclo[3.3.1]nonane and 7,9-Diphenyl-8-azabicyclo[4.3.1]decane via Bucherer Reaction in N,N-Dimethylformamide: Influence of the Temperature and Stereochemical PathThe unreactives ketones related to 2,4-diphenyl-3-azabicyclo [3.3.1]nonan-9-one to the Bucherer reaction in usuals conditions show excellent reactivity in DMF. as unique solvant. The stereochemical paths of these reactions and the synthetic utility of the temperature modification are described.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19830660129
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  • 6
    Electronic Resource
    Electronic Resource
    Un nouvel exemple de transposition: l'épimérisation en C(3) d'hydroxy-3-δ1-pyrazolines dérivées de sucresDérivés C-glycosyliques XXXIX; XXXVIII: [1]. (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 359-365 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Novel Example of Reversible Ring Opening: The Epimerization at C(3) of Sugar 3-Hydroxy-Δ1-pyrazolinesReaction of 1 (either geometrical isomer) with hydrazine followed by in situ Ag2O oxidation led to two pairs of interconverting isomers 4 ⇄ 5 and 6 ⇄ 7. By the same treatment, (Z)-10 and (or) (E)-10 gave the pair 11 ⇄ 12. Acetylation of 4 ⇄ 5 led to a non interconverting mixture of 8 and 9. This fact, and the lack of incorporation of 18O when the epimerization took place in the presence of H218O indicated that the most probable mechanism consisted in a reversible ring opening (D ⇄ E ⇄ F). The kinetic parameters of these reactions are given and structural assignments proposed for the new compounds.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630205
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  • 7
    Electronic Resource
    Electronic Resource
    Préparation de dérivés de sucres acétyléniques terminaux et d'acides ynuroniques par réaction de Wittig. Note de laboratoireUtilisation d'ylures du phosphore en chimie des sucres XLIII; XLII: [1]. (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 1181-1189 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Terminal Acetylenic Sugars Derivatives and Ynuronic Acids Derivatives by Use of a Wittig ReactionThe method described for the preparation of terminal acetylenic sugars presents two advantages over earlier procedures: no new asymmetric center is created and the chain can be extended by one or more C-atoms. The method also allows preparation of ynuronic acids. The aldehydosugars derivatives 1-7 gave in good to excellent yields the corresponding gem-dibromoenoses 8-14 from which either the terminal acetylenic sugars derivatives 15-21 or the ynuronic acids 22-24 were easily prepared. A few examples of 1,3-dipolar cycloadditions (leading to 28-30) with these acetylenic sugar derivatives are also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630509
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  • 8
    Electronic Resource
    Electronic Resource
    Ungewöhnliche Reaktivität gespannter Brückenkopfderivate (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 3518-3520 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unusual Reactivity of Strained Bridgehead DerivativesThe solvolysis of 7,7-dimethyl-1, exo-2-bis(trifluoromethylsulfonyloxy)norbornane (5) in Et2O/I2Mg and 80% MeOH proceeds with formation of substituted 2-norbornyl cations, yielding 1, exo-2-diiodo-7,7-dimethylnorbornane (9) and camphenilone (13), respectively. When the vic-diiodide 9 is treated with LiAlH4/C6H6 partial epimerization to 1,endo-2-diiodo-7,7-dimethylnorbornane (12) is observed without reduction; this result is probably due to steric hindrance of the reactants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831161025
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  • 9
    Electronic Resource
    Electronic Resource
    Vinylkationen, 36. Solvolyse von Cycloalkylidenmethyl- und 1-Cyclopenten-1-yl-triflaten (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 772-782 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vinyl Cations, 36. Solvolysis of Cycloalkylidenemethyl and 1-Cyclopenten-1-yl TriflatesCyclohexlidenemethyl triflate (2), cyclobutylidenemethyl triflate (5), 1-cyclopenten-1-yl triflate (7), bicyclo [3.1.0]hex-2-en-2-yl triflate (9), 1-cyclobutylideneethyl triflate (19), and 2-methyl-1-cyclopenten-1-yl triflate (29) were solvolyzed in solvents of various ionizing power and nucleophilicity and the solvolysis products were identified. The cyclobutylidenealkyl triflates solvolyze via a vinyl cation mechanism involving ion pairs with rearrangement to cyclopentene and cyclopentanone compounds. The 1-cyclopenten-1-yl triflates do not produce vinyl cation intermediates but give only the corresponding ketones via an O—S bond cleavage of the triflate group.
    Notes: Cyclohexylidenmethyl-triflat (2), Cyclobutylidenmethyl-triflat (5), 1-Cyclopenten-1-yl-triflat (7), Bicyclo[3.1.0]hex-2-en-2-yl-triflat (9), 1-Cyclobutylidenethyl-triflat (19) und 2-Methyl-1-cyclopenten-1-yl-triflat (29) wurden in Lösungsmitteln verschiedener Ionisierungsstärke und Nucleophilie solvolysiert und die Solvolyseprodukte aufgeklärt. Die Cyclobutylidenalkyl-triflate solvolysieren über Ionenpaarmechanismen (Vinylkationen) unter Umlagerung zu Cyclopenten- und Cyclopentanon-Derivaten. Die 1-Cyclopenten-1-yl-triflate reagieren nicht über Vinylkationen als Zwischenstufe, sondern unter O—S-Spaltung zu den entsprechenden Ketonen.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150238
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  • 10
    Electronic Resource
    Electronic Resource
    Notizen. Sterisch gesteuerte Reaktionswege von substituierten 2-Norbornyl-Kationen (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 815-818 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Steric Control in the Reaction of Substituted 2-Norbornyl CationsThe reaction of camphenilone (1b) with trifluoromethanesulfonic anhydride (Tf2O) yields 7,7-dimethyl-1,exo-2-bis(trifluoromethylsulfonyloxy)norbornane (4b) (60%). 6,6-Dimethyl-2-norbornanone (1c) affords under the same conditions 6,6-dimethyl-2-norbornen-2-yl triflate (5c) (70%). The reaction pathways of the intermediate 2-(trifluoromethylsulfonyloxy)-2-norbornyl cations are mostly controlled by steric factors, the inductive effect playing no significant role.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160237
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