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  • Wiley-Blackwell  (55)
  • 1980-1984  (55)
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  • 1
    Electronic Resource
    Electronic Resource
    Photochemische Reaktionen 115. Mitteilung [1]. Zur Photochemie konjugierter γ,δ-Epoxyenone: Der Einfluss eines Hydroxylsubstituenten in ∊-StellungMit den besten Wünschen Herrn Dr. Willy G. Stoll zum 70. Geburtstag zugeeignet (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 2230-2257 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photochemistry of Conjugated γ,δ-Epoxyenones: The Influence of a Hydroxy Substituent in ∊-PositionOn 1n, π*- or 1π,π*-excitation (λ ≥ 347 or λ=254 nm), the ε-hydroxy-γ;,δ-epoxyenone 8 undergoes fission of the C(γ)—O bond followed by the cleavage of the C(δ)-C(ε) bond. This hitherto unknown sequence of reactions is evidenced by the structure determination of the new type products 10-17 and 25, including a synthetic proof for 12 and the X-ray analysis of 11 (X-ray data: triclinic P1; a=7,386(2), b=8,904(4), c=9,684(5)Å; α=82,29(4)°, β=74,46(3)°, γ=82,29(3)°; Z=2).The selective 1π,π*-excitation also induces competitive C(γ)-C(δ) bond cleavage to yield the bicyclic acetal 18 and a ketonium-ylide intermediate a, which photochemically forms a carbene b giving the allene 19 and the cyclopropene 20.On 1n,π*-excitation of the acetate 9 the initial C(γ)-O bond fission is, in contrast to the behaviour of the corresponding alcohol 8, followed by a 1,2-methyl shift affording (E/Z)-28 or by a cyclization-autoxidation process yielding the lactone 29.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19800630813
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  • 2
    Electronic Resource
    Electronic Resource
    Photochemische Reaktionen 130. Mitteilung129. Mitteilung s. [1].. Zur Photochemie von 5,6-Epoxy-1,3-dienen: Der Einfluss eines 7-Hydroxysubstituenten auf die CarbenbildungTeil II; Teil I s. [2]. (1983)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 66 (1983), S. 2236-2251 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photochemistry of 5,6-Epoxy-1,3-dienes: Influence of a 7-Hydroxy Substituent on the Carbene FormationOn singlet excitation (λ=254 nm) in MeCN the hydroxy-epoxydiene (E)-4 undergoes photocleavage to the carbene intermediates d and e as main processes. The carbene d, showing behaviour typical of vinyl carbenes, undergoes addition to the adjacent double bond furnishing the cyclopropenes 5A + B. The carbene e, however, undergoes an insertion reaction into the neighbouring carbinol C,H-bond leading to the enol intermediate 21, which gives rise to the compounds 6A + B and 7A + B. To a lesser extent the products 8A + B are formed via another enol intermediate (32). On photolysis of (E)-4 in MeOH instead of MeCN the enol intermediates 21 and 32 undergo rapid tautomerisation to the ketones 9A + B (main products) and 11.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19830660735
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic structure of small copper clusters (1983)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 23 (1983), S. 1201-1207 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An all-electron ab initio LCAO-MO SCF calculation has been carried out for the electronic structure of small copper clusters (Cun, n = 2-6). The basis set superposition error occurring in the calculation, the equilibrium configuration of Cu3, the bond energy in the clusters, and the localized d-hole in excited and ionized states of Cu2 are closely examined.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560230410
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  • 4
    Electronic Resource
    Electronic Resource
    Polymerization of 1,3-cycloheptadiene and the structure of poly(1,3-cycloheptadiene)s obtained by ionic initiators (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 215-217 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820123
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  • 5
    Electronic Resource
    Electronic Resource
    On the salt-linkage formations of porous and nonporous silica particles with trimethylammonium glycol chitosan iodide (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 1715-1724 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The stoichiometry of the salt-linkage formations of nonporous and porous silica particles with trimethylammonium glycol chitosan iodide (TGCI) was investigated by comparing the results of colloid titration and adsorption experiments with those of potentiometric titrations. The surface charge (Q) of colloidal silica as function of pH was evaluated by means of the colloid titration with TGCI. On the other hand, the density (D) of ≡ SiO⊖ groups of silica gel at different pH was also evaluated by the adsorption experiment of TGCI. These results obtained were compared with the Q vs. pH and D vs. pH curves which were obtained by the potentiometric titrations at various ionic strengths for colloidal silica and silica gel, respectively. It was concluded that the ≡ SiO⊖ groups on the surface of nonporous colloid silica form the salt-linkages stoichiometrically with ⊕N(CH3)3-groups in TGCI, whereas the salt-linkage formation between ⊕N(CH3)3-groups in TGCI and ≡ SiO⊖ groups of silica gel does not follow the stoichiometric relationship, since the salt-linkages of the ≡ SiOominus; groups in the pores of the silica gel could be affected by the steric hindrance of the TGCI chain.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820612
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  • 6
    Electronic Resource
    Electronic Resource
    Preparations and asymmetric, reducing abilities of chiral polymeric amine-boranes (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 2563-2569 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymeric amine-boranes 2b, 4b, and 8c and their corresponding low-molecular-weight model compounds 3b, 5b, and 6b were obtained by reaction of chiral amines with diborane; these amines were poly(pyrrolidine-1,2-diylmethylene) (2a), poly(imino-1-isobutylethylene) (4a), poly{[1,2-bis(4-vinylphenyl)ethyl]amine} (8b), 1-methylpyrrolidin-2-yl-1-pyrrolidinyl-methane (3a), N1-isopentyl-N2-methyl-4-methyl-1,2-pentanediamine (5a), and α-phenylphenethylamine (6a). The polymeric amine-boranes are white powders, stable to be kept for several weeks at room temperature, whereas the low-molecular-weight model compounds are less stable syrup-like materials. The reduction of acetophenone to optically active 1-phenylethanol was carried out with the chiral amine-boranes in the presence of boron trifluoride etherate at various reaction temperatures. The product resulting from the reduction with 8c can easily be separated from the reaction mixture by filtration. The optical yield of the product obtained with 8c was 8,9% at -40°C. The highest optical yield (25,3%) was obtained with α-phenylphenethylamineborane 6b at 0°C.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021811213
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of poly[(3S)-1,2,3,4-tetrahydroisoquinoline-2,3-diylmethylene] and its use as chiral catalyst in the addition of arenethiols to 2-cyclohexen-1-one (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 675-679 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly[(3S)-1,2,3,4-tetrahydroisoquinoline-2,3-diylmethylene] (4) and (3S)-3-(1,2,3,4-tetrahydroisoquinolin-2-ylmethyl)-2-methyl-1,2,3,4-tetrahydroisoquinoline (7) were prepared using (3S)-1,2,3,4-tetrahydro-3-isoquinolinecarboxylic acid (1) as starting material. The optically active amines 4 and 7 were used as asymmetric catalysts for the addition of thiophenol (8a), 4-tert-butylthiophenol (8b), or 4-chlorothiophenol (8c) to 2-cyclohexen-1-one (9). 4 yielded 3-phenylthiocyclohexanone (10a) with the highest optical yield of 24% at -25°C, showing a marked polymer effect with respect to enantiomeric excess.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840401
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  • 8
    Electronic Resource
    Electronic Resource
    Stoichiometric salt-linkage formation of trimethylammonium glycol chitosan iodide with a carboxylic type ion exchanger (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1233-1238 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The adsorption of trimethylammonium glycol chitosan iodide (TGCI) on Dowex CCR-2 resin was investigated at different pH values and resin weights. The concentration of Na+ or Ca2+ ions, released by the ion exchange reaction with TGCI, was measured by inductively coupled plasma spectroscopy. It was found that the amount of the released ions is comparable to that of the absorbed TGCI. This indicates that the salt-linkage formation of carboxylate ions of the exchanger with ⊕N(CH3)3-groups in TGCI follows a stoichiometric relationship. This result is discussed in connection with the form of the polymer layer adsorbed on the solid surface.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830517
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  • 9
    Electronic Resource
    Electronic Resource
    Formaldehyde polymers, 30Part 29: cf.1.. Preparation of 5-hydroxy-4-chromanones and 8-hydroxy-1-tetralon and their properties as UV-absorbers (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1969-1977 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 5-Hydroxy-6,8-dimethyl-4-chromanone (4a) and 8-hydroxy-5,7-dimethyl-1-tetralon (4b) were synthesized from 6,8-dimethyl-4 chromanone (1a) and 5,7-dimethyl-1-tetralon (1b), respectively. 5-Hydroxy-7-methody-2,2-dimethyl-4-chromanone (6) was prepared from 5,7-dihydroxy-2,2-dimethyl-4-chromanone (5). Cyclohexane solutions of 1a, 1b, 4a, 4b, 6, 5-hydroxymethyl-6,8-dimethyl-4-chromanone (7), 3-hydroxy-2,6-dimethyl-4-chromanone (8), and 2-hydroxy-4-octyloxybenzonphenone (9) were irradiated. The photostability of these compounds was found to decrease in the following order: 4b 〉 4a, 6 〉 9 〉 1a, 1b. 7, 8. Poly(venyl chloride) films containing 5, 0 wt.-% of 4a, 4b, or 6 were found to be stable against photooxidation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830816
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  • 10
    Electronic Resource
    Electronic Resource
    Swirl flow studies in diffusers using the flux analysis method with orthogonal curvilinear coordinates (1982)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 18 (1982), S. 1385-1399 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A computational method of flux analysis is applied to the study of the swirling flow of different regimes through a diffuser pipe. The flux analysis method is an iterative procedure to construct a system of orthogonal curvilinear co-ordinates consisting of stream-surface and normals following the flow. Examples of the inviscid swirling flow of an incompressible fluid are calculated, and deformations of vortices in a diffuser pipe are studied. For a simple vortex with rigid rotation the deceleration of flow is remarkable on the axis, where the total energy has the lowest level. For a Burgers type vortex, provided the circulation number exceeds a critical value, the rate of deceleration of flow along the axis become more pronounced for only a slight increase of swirl strength, and ultimately a stagnation point appears on the axis. The present method, however, may not be applied to the flow with stagnation point.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620180910
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