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  • Wiley-Blackwell  (20)
  • American Association for the Advancement of Science (AAAS)
  • International Union of Crystallography (IUCr)
  • 1990-1994  (20)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Helical amylose complexes with organic complexands, 1. Microcalorimetric and circular dichroitic investigations (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 1071-1080 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Complexation of different synthetic amyloses (Pn between 9 and 1000) with sodium dodecyl sulfate and 4-tert-butylphenol was investigated by means of microcalorimetry and circular dichroism. The results were compared with the complexation behaviour of α-, β and γ-cyclodextrins with the same guest molecules. All amyloses investigated formed complexes with sodium dodecyl sulfate in a fast reaction. In these complexes the amyloses possess a helical conformation with six glucose units per turn, which should already exist in aqueous solution before complexation. tert-Butylphenol only forms complexes with amyloses of a Pn higher than 100. In this case apparently the amylose must adjust to complex the tert-butylphenol in a helix with seven or eight glucose units per turn. Using these methods the complexation of sodium dodecyl sulfate with amylopectin was also demonstrated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930504
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  • 2
    Electronic Resource
    Electronic Resource
    Chirality of poly(vinyl compounds), 12.Part 11: cf. G. Wulff, P. K. Dhal, Macromolecules 23, 4525 (1990). α-(trityloxymethyl)acrylonitrile, a new monomer forming optically active, single-sense helical polymers (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 2993-3003 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The new monomer, α-(trityloxymethyl)acrylonitrile (2), was prepared. It can be polymerized anionically with optically active initiator systems to yield an insoluble polymer showing strong optical activity. In contrast to trityl methacrylate optically active polymers are obtained from 2 in toluene as well as in tetrahydrofuran. After removal of the trityl groups the optical activity is completely lost in the resulting poly[α-(hydroxymethyl)acrylonitrile]. It is therefore concluded that an atropisomeric helical arrangement is present in poly[α-(trityloxymethyl)acrylonitrile]. Compared to trityl methacrylate and its polymer the new monomer 2 and the corresponding polymer show higher stability against splitting off of the trityl groups.
    Additional Material: 9 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021911216
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  • 3
    Electronic Resource
    Electronic Resource
    Enzyme-analogue built polymers, 29.Part 28: G. Wulff, G. Kirstein, Angew. Chem. 102, 706 (1990); Angew. Chem., Int. Ed. Engl. 29, 684 (1990). The preparation of defined chiral cavities for the racemic resolution of free sugars (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1329-1338 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: New types of macroporous polymers containing chiral cavities were prepared for the racemic resolution of free sugars. As template monomers 6-O-methyl- and 6-O-benzyl-αD-galactopyranose 1,2;3,4-tetra-O-bis(4-vinylphenylboronate) (3c and b) as well as 1-O-methyl- and 1-O-benzyl-βD-fructopyranose 2,3;4,5-tetra-O-bis(4-vinylphenylboronate) (4c and b) were copolymerized with a large amount of ethylene dimethacrylate. After splitting off the respective templates, these polymers were used for the racemic resolution of the racemates of D,L-galactose and D,L-fructose, and also the racemates, of 1-O-methyl- and 1-O-benzyl-D,L-fructose. The polymer prepared from 3b yielded the highest selectivity for the racemic resolution of D,L-galactose. In the case of fructose the benzyl-ether-imprinted polymers yielded the highest selectivity, especially for 1-O-methyl-D,L-fructose separation. Polymers imprinted with D-galactose derivatives showed inverse selectivity by preferably absorbing L-fructose from the racemate. Polymerization at lower temperatures usually yielded more selective polymers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920610
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  • 4
    Electronic Resource
    Electronic Resource
    Chirality of poly(vinyl compounds), 13.Part 12: cf.1. Sterical requirements in analogues of trityl methacrylate for the preparation of optically active, single-sense helical polymers (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 3005-3010 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Trityl methacrylate possesses two different substituents at the olefinic double bond. The larger one containing the trityl group forms the outside sphere of the helix in the corresponding polymers. In this paper the role of the second, smaller substituent is discussed. For this purpose four new monomers, methyl α-(trityloxymethyl)acrylate (5), ethyl α-(trityloxymethyl)acrylate (6), α-(trityloxymethyl)styrene (7), and trityl α-ethylacrylate (3), were prepared. Polymerization experiments showed that this substituent should be of minimum size to obtain a stable helix. More extended substituents though do not fit into the helical arrangement and therefore neither anionic nor radical polymerization was achieved.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021911217
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  • 5
    Electronic Resource
    Electronic Resource
    Cationic polymerization of (Z)-2-ethoxyvinyl acetate (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 2405-2411 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The new monomer (Z)-2-ethoxyvinyl acetate (5) was prepared diastereoselectively. It contains both an acetoxy and an ethoxy group on the same olefinic bond, and it was of interest to investigate its polymerization behaviour. In contrast to vinyl acetate, it can be polymerized by cationic initiation to form polymers of moderate molecular weight. The molecular weight distribution is surprisingly narrow (Mw/Mw ≈ 1,15 - 1,25)though this is not a living polymerization system. The polymerization is anticipated to proceed via a stabilized acetoxonium ion. In poly(1-acetoxy-2-ethoxyethylene), (6), the acetyl group can be methanolyzed, yielding poly(1-ethoxy-2-hydroxyethylene) (7), a polymer with high solubility in polar solvents.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930923
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  • 6
    Electronic Resource
    Electronic Resource
    Aldol-group-transfer polymerization of 2-phenyl-1,3,2-dioxaborole. Preparation of graft and comb-like polymers (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 1569-1582 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The aldol-group-transfer polymerization of 2-phenyl-1,3,2-dioxaborole is described. By initiation with aldehydes the molecualr weights of the polymers can be controlled through the mole ratio of initiator to monomer, ranging between 700-130000. The phenylboronic ester groups can be removed from the polymer, yielding polymers carrying a hydroxyl group at each carbon atom of the chain. It was also possible to prepare polymerizable macromonomers by initiation with 4-vinylbenzaldehyde. Polymerization of the macromonomers by radical initiation yields comb-like arrangements. Similar polymers can be obtained by grafting phenyl-1,3,2-dioxaborole onto a polymer containing benzaldehyde moieties in the side chains.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940605
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  • 7
    Electronic Resource
    Electronic Resource
    Versuche zur kontrollierten Synthese von ZSM-3 (1991)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 63 (1991), S. 766-767 
    Details
    ISSN: 0009-286X
    Keywords: Zeolithe ; ZSM-3 ; Synthese ; Lithium ; Aluminium ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330630728
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  • 8
    Electronic Resource
    Electronic Resource
    On the chirality of polyvinyl compounds, 16Part 15: cf. ref.4. Optical activity of copolymers consisting of distyryl diads alternating with substituted maleimide or maleic anhydride units (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 3665-3677 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The copolymerization of 3,4-O-cyclohexylidene-D-mannitol 1,2 : 5,6-bis-O-[(4-vinylphenyl)-boronate] (M1) with different N-substituted maleimides and with maleic anhydride has been studied. These monomers copolymerize in 1 : 1 proportion, yielding after removal of the template (3,4-O-cyclohexylidene-D-mannitol) copolymers with bis(4-vinylphenylboronic acid) diads alternating with the other comonomeric unit. By deboronation these diads can be transformed to distyryl diads. These diads possess predominantly (S,S)-configuration; thus optically active polymers with main-chain chirality were produced. The chiroptical properties (optical rotation circular dichroism) of the copolymers were studied. Corresponding copolymers with maleic pride units can easily be transformed by polymer analogous reaction with nucleophiles, as exemplified by alcoholysis with fatty alcohols.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021951113
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  • 9
    Electronic Resource
    Electronic Resource
    On the chirality of polyvinyl compounds, part 17Part 16: cf. ref. 1. Investigations on main-chain chiral copolymers with alternating structure (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 3679-3688 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 3,4-O-Cyclohexylidene-D-mannitol 1,2:5,6-bis-O-[(4-vinylphenyl)boronate] (M 1) was copolymerized with methyl methacrylate (MMA) in presence of AlEt1,5 or SnCl4. The expected alternating bis(4-vinylphenylboronic acid)-MMA triad structures were only formed to a lesser extent. Instead, predominantly alternating 4-vinylphenylboronic acid-MMA structures were obtained. Since no crosslinking was observed, a cyclocopolymerization must have occurred. In this case an MMA unit is inserted between the two styrene residues of M 1, thus forming a 21-membered ring system. Copolymerization forming alternating 4-vinylphenylboronic acid-MMA diads is apparently even faster than the direct copolymerization forming distyryl diads. After removal of the template (3,4-O-cyclohexylidene-D-mannitol), these copolymers still show pronounced optical activity and circular dichroism with a negative Cotton effect at 233 nm. After deboronation of the copolymers, optically active, predominantly alternating styrene-MMA copolymers are obtained.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021951114
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  • 10
    Electronic Resource
    Electronic Resource
    New type of polyvinylsaccharides with N,N-dimethylbarbituric acid as a linker between sugar and styrene residue (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 195 (1994), S. 2603-2610 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new type of polyvinylsaccharide with a C—C bond between the pendent sugar and the backbone was prepared. Without use of protecting groups N,N-dimethylbarbituric acid was used to link sugars directly to a polymerizable group. Homo- as well as copolymers were prepared by radical initiation. The barbiturate ring of the polymer undergoes a specific base-catalyzed ring cleavage to give highly water-soluble polymers. Also in copolymers with less than 32 mol-% styrene residues water solubility is attained due to the newly formed diamide groups.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1994.021950728
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