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  • 1
    Electronic Resource
    Electronic Resource
    Aza-2-dienes-1,3. Partie 5. Préparation de N-aminoimidazoles, 3H-pyrroles, triazolo[1,2,4][1,5-a]pyrazines et imidazo[1,2-a]pyrazines (1987)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 187-195 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Aza-1,3-dienes. Access to N-Aminoimidazoles, 3H-Pyrroles, [1,2,4]Triazolo[1,5-a]pyrazines, or Imidazo[1,2-a]pyrazinesNucleophilic attack of 5-(dialkylamino)-2-aza-1,3-diene-1,1-dicarbonitriles (or their 1-methoxycarbonyl analogous) by hydrazines or hydrazdes gives substituted N-aminoimidazoles, [1,2,4]triazolo-[1,5-a]pyrazines, or α-dihydrazino derivatives. With α-amino esters (or analogous), imidazo[1,2-a]pyrazines are produced. Addtion of cyanide anions occurs also with formation of substituted 3H-pyrroles. Structures and rationalisation of this nucleophilic attack are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19870700123
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  • 2
    Electronic Resource
    Electronic Resource
    Isomérisation cis-trans en Série Alkyl-4-vinyl-3-pipéridine par Sigmatropie [3.3]. Synthèse des Epivinyl Isomères des Alcaloïdes du Quinquina (1985)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 68 (1985), S. 789-800 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: cis, trans Isomerization of 4-Alkyl-3-vinylpiperidines by [3.3] Sigmatropic Rearrangement. Synthesis of Epivinyl Isomers of Cinchona AlkaloidsIsomerization of 4-alkyl-3-vinylpiperidines induced by formaldehyde has been studied for ethyl meroquinate and quinotoxine. The equilibration of cis- and trans-isomers occurs by involvement of a [3.3] sigmatropic rearrangement. This process permits an easy access to the trans-isomers from natural products of cis-configuration and has been used to obtain the epivinyl isomers of cinchona alkaloids.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19850680329
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  • 3
    Electronic Resource
    Electronic Resource
    Aza-2-diènes-1,3 4. Préparation et propriétés d'alkyl-1-pyrazone-imines et de leurs isomères (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 1025-1033 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Aza-1,3-dienes. Synthesis and Properties of 1-Alkylpyrazone-imines and their TautomersTreatment of 5-dialkylamino-1,1-dicyano-2-aza-1,3-dienes (or their 1-methoxycarbonyl analogoues) with primary amines gives substituted 1-alkyl-3-cyano-(or methoxycarbonyl-)pyrazoneimines. Tautomeric behaviour, nucleophilic addition to imino function and spectroscopic data of these isomers are examined.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690510
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  • 4
    Electronic Resource
    Electronic Resource
    Aza-2-diènes-1,3 3. Nouvelles voies d'accès à des amino-2-pyrazines substituées (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 793-802 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Aza-1,3-dienes. A New Approach to Substituted 2-AminopyrazinesTreatment of enamines by tosylated isonitrosomalono derivatives gives access to 5-dialkylamino-1, 1-dicyano 2-aza-1,3-dienes (or 1-methoxycarbonyl analogous) which are precursors of various regiospecific 5,6-substituted 2-amino-3-cyano (or methoxycarbonyl) pyrazines. Some examples of utilisation of these intermediates for synthesis of lumazines, pteridines, and other bicyclic skeletons are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690406
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  • 5
    Electronic Resource
    Electronic Resource
    Synthèse de composé photoréticulables, 9.Partie 8: cf. B. Boutevin, Y. Piétrasanta, J. P. Parisi, Makromol. Chem. 188, 1621 (1987). Modification du polybutadiène carboxytéléchélique par des monomères acryliques (1989)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 190 (1989), S. 2363-2372 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The addition of mercaptoacetic acid upon radical initiation onto carboxytelechelic polybutadienes (1) which have an average mass M̄n = 4400 gives polyacids having about twelve carboxylic groups. The reaction is followed by 13C NMR, 1H NMR and by GPC. The thiol disappears according to a first order law. Besides, the value of the modification rate obtained from acido-basic titration confirms that obtained from NMR. In a second step, 2,3-epoxypropyl methacrylate is added to the acid groups to obtain an insaturated and carboxylated polydienic oligomer 5. An application of these oligomers processed with a reactive diluter shows their high cross-linking ability under UV irradiation and confirms the improvement of the flexibility properties compared to those of traditional insaturated oligomers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1989.021901002
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  • 6
    Electronic Resource
    Electronic Resource
    Structural optimization: A new dual method using mixed variables (1986)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 23 (1986), S. 409-428 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A new and powerful mathematical programming method is described, which is capable of solving a broad class of structural optimization problems. The method employs mixed direct/reciprocal design variables in order to get conservative, first-order approximations to the objective function and to the constraints. By this approach the primary optimization problem is replaced with a sequence of explicit subproblems. Each subproblem being convex and separable, it can be efficiently solved by using a dual formulation. An attractive feature of the new method lies in its inherent tendency to generate a sequence of steadily improving feasible designs. Examples of application to real-life aerospace structures are offered to demonstrate the power and generality of the approach presented.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620230307
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  • 7
    Electronic Resource
    Electronic Resource
    Étude asymptotique des phénomènes acoustiques dans un mélange fluide-solide thermoélastique (1985)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 7 (1985), S. 154-169 
    Details
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: Asymptotic study of the macroscopie behaviour of a fluid-thermoelastic solid mixture. The homogenization theory is applied to the study of small perturbations in a mixture of a thermoelastic solid and a viscous compressible fluid. There appear memory phenomena in the bulk behaviour as well as a modification in the initial data regarding the original problem. The convergence of the formal asymptotic expansion to the solution of the homogenized equations is proved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mma.1670070110
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  • 8
    Electronic Resource
    Electronic Resource
    Efficient approximation concepts using second order information (1989)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 28 (1989), S. 2041-2058 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The primary goal of this paper is to show how second derivative information can be used in an effective way in structural optimization problems. The basic idea is to generate such an information at the expense of only one more ‘virtual load case’ in the sensitivity analysis part of the finite element code. To achieve this goal a primal-dual approach is employed, that can also be interpreted as a sequential quadratic programming method.Another objective is to relate the proposed method to the well known family of approximation concepts techniques, where the primary optimization problem is transformed into a sequence of non-linear explicit subproblems. When restricted to diagonal second derivatives, the new approach can be viewed as a recursive convex programming method, similar to the ‘Convex Linearization’ method (CONLIN), and to its recent generalization, the ‘Method of Moving Asymptotes’ (MMA).This new method has been successfully tested on simple problems that can be solved in closed form, as well as on sizing optimization of trusses. In all cases the method converges faster than CONLIN, MMA or other approximation techniques based on reciprocal variables.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620280905
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  • 9
    Electronic Resource
    Electronic Resource
    Programme d'Identification Moléculaire Informatisée à Partir de Spectres Raman. Exemples d'Inclusions Fluides dans les Minéraux (1987)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 317-322 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In addition to PAIRS (infrared spectroscopy) and PARS (Raman spectroscopy) interpreters, used for organic functions, a third interpreter, PARSM, has been developed. This interpreter is used to recognize chemical and mineralogical functions met during fluid inclusions. After a brief discussion the great importance of Raman spectroscopy in studies of fluid inclusions, PARSM is described.
    Notes: A l'image des interpréteurs PAIRS (spectroscopie infrarouge) et PARS (spectroscopie Raman) pour des fonctions organiques, un troisième interpréteur PARSM a été élaboré. Cet interpréteur sert à la reconnaissance de fonctions chimiques et minéralogiques souvent rencontrées dans I'étude des inclusions fluides. Après une petit aperçu sur l'importance de la spectroscopie Raman pour l'étude des inclusions fluides, nous décrivons la démarche utilisée pour la mise au point de PARSM.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250180504
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  • 10
    Electronic Resource
    Electronic Resource
    Structure Moléculaire des Dérivés Nitres Aromatiques 5-Spectres de Vibration et Analyse par Coordonnées Normales du 1,3,5-Triamino-2,4,6-trinitrobenzène (1985)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 16 (1985), S. 143-148 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Full Raman and IR spectra of 1,3,5-triamino-2,4,6-trinitrobenzene from 10 to 4000 cm-1 are reported. A normal coordinate treatment using a modified Urey-Bradley force field and taking into account the cyclic redundancies and the intramolecular hydrogen bonds leads to an assignment. The pure modes are: the CNO2 torsion at 101 cm-1, the CNH2 torsion at 606 cm-1, the out-of-plane NH2 deformation at 1030 cm-1, the NH2 in-plane bending at 1212 cm-1 and two NH2 stretching modes at 3208 and 3308 cm-1.
    Notes: Les spectres IR et Raman de 1,3,5-triamino-2,4,6-trinitrobenzène ont été mesurés sur toute la gamme spectrale (10 à 4000 cm-1). Une analyse par coordonnées normales utilisant un champ de force Urey-Bradley modifié et tenant compte des redondances cycliques permet l'attribution. Les seuls modes purs sont: la torsion CNO2 à 101 cm-1, la torsion CNH2 à 606 cm-1, la déformation angulaire hors du plan NH2 à 1030 cm-1, la déformation angulaire dans le plan NH2 à 1212 cm-1 et les deux déformations de valence NH2 à 3208 et 3308 cm-1.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250160303
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