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  • Chemistry  (15)
  • Chemistry, Organic  (1)
  • Diels-Alder reactions  (1)
  • 1
    Unbekannt
    Functional Molecular Nanostructures (2005)
    Berlin, Heidelberg : Springer
    Details
    Schlagwort(e): Biochemistry ; Chemistry, Organic ; Nanotechnology ; Polymers
    ISBN: 9783540314745
    URL: https://doi.org/10.1007/b79606
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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    E-BOOK
  • 2
    Digitale Medien
    Digitale Medien
    Repetitive Strategy for Exponential Growth of Hydroxy-Functionalized Dendrons (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 1330-1334 
    Details
    ISSN: 0947-6539
    Schlagwort(e): dendrimers ; exponential growth ; repetitive syntheses ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The synthesis of dendrons with orthogonally protected functional groups, which allows the construction of dendrons in an exponential fashion, is described. The sequence has been carried out on a gram scale for the first, second, and fourth generation. The dendrons have a relatively loose and flexible structure, which should make further growth feasible. Owing to the dendrons' adjustable and broadly applicable substitution pattern, they are the first representatives of a future construction kit for the systematic synthesis of layered dendrimers. The coupling step involves urethane formation.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/chem.19960021021
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  • 3
    Digitale Medien
    Digitale Medien
    Building Blocks for the Construction of Large Chloro-Functionalized, Hexagonal Oligophenylene Cycles (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 451-458 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Cross-coupling ; Modular chemistry ; Repetitive synthesis ; Macrocycles ; Shape persistence ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: -The synthesis of a variety of kinked oligophenylene building blocks is described. The synthetic strategy is repetitive, utilizes the Suzuki cross-coupling protocol, and involves potentially bifunctional building blocks (modules) which carry one functional group for coupling and one group which serves as place holder. After the coupling, the placeholder is converted into a coupling functionality for the next growth step. The building blocks also carry chloro-substituents which are unaffected by all transformations. For one of the large building blocks it is shown that it actually can be cyclized into an oligophenylene macrocycle with a chloro-substituent at each corner and a pair of hexyl chains at each side.
    Materialart: Digitale Medien
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    Artikel (Nationallizenzen)
  • 4
    Digitale Medien
    Digitale Medien
    Polymerization of styrenes carrying dendrons of the first, second and third generation (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 517-527 
    Details
    ISSN: 1022-1336
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The synthesis of styrene monomers 5(G-1,2,3) with Fréchet-type dendrons of the first, second and third generation, and their radically initiated polymerization to result in high molecular weight dendrimers 6(G-1,2,3) are reported. First light-scattering investigations using 6(G-2) show that this polymer is best described as a Gaussian chain.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/marc.1996.030170804
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  • 5
    Digitale Medien
    Digitale Medien
    Amino-Functionalized, Second-Generation Dendritic Building Blocks (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 1275-1283 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Dendrimers ; Amino-functionalized dendrons ; Building blocks ; Protecting groups, orthogonal ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The multi-gram scale synthesis of first- and second-generation dendrons with Boc- and Cbz-protected amino groups in the periphery and methyl/ethyl esters at the focal points is described. Saponification of the esters and deprotection of the amines are shown to be strictly orthogonal processes which makes these dendrons valuable building blocks for future constructions.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    First steps towards alternating copolymers from a functionalized [1.1.1]propellane and dendronized acrylatesDedicated to Prof. W. Heitz on the occasion of his 65th birthday (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 199 (1998), S. 745-749 
    Details
    ISSN: 1022-1352
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The synthesis of some alternating copolymers from a tert-butyl(dimethyl)silyl protected hydroxymethyl substituted [1.1.1]propellane and acrylates carrying Fréchet-type dendrons of the first and second generation is described. A copolymer with a second generation dendron at every repeat unit was obtained with M̄w = 43700 as determined via gel permeation chromatography.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    A Biphenyl Construction Kit for Modular Chemistry (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 303-309 
    Details
    ISSN: 0947-3440
    Schlagwort(e): Cross-coupling ; Modular chemistry ; Repetitive synthesis ; Nanostructures ; Synthesis design ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The synthesis of a number of telechelic biphenyls with one of the functional groups, B(OH)2, TMS, Br and I, at each ring is presented. These biphenyls constitute a construction kit for modular chemistry using the Suzuki cross-coupling protocol.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.199719970205
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  • 8
    Digitale Medien
    Digitale Medien
    Ring-Chain Equilibrium between an [18]Cyclacene Derivative and a Ladder Oligomer (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 99-105 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Ladder polymers ; Macrocycles ; Cycloadditions ; Retro Diels-Alder reaction ; Benzo[c]furan ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The synthesis of the AB-type Diels-Alder (DA) monomer 12 is reported whose self-condensation leads to the formation of the linear ladder oligomer 17 and its cyclic congener 18. 18 is the largest [n]cyclacene derivative known (n = 18) and can be obtained by thermal treatment of 17 in yields of up to 45% utilizing the reversibility of the DA cyclization involved. 17 can be considered a “storage form” for 18.
    Materialart: Digitale Medien
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    Artikel (Nationallizenzen)
  • 9
    Digitale Medien
    Digitale Medien
    Hydroxy-Functionalized Dendritic Building Blocks (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2551-2556 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Dendrimers ; Hydroxy-functionalized dendrons ; Orthogonal protective groups ; Building blocks ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A convenient and practical multi-gram procedure for the synthesis of second- (G2; 4a, 5a, 5d) and third-generation (G3; 6a) dendrons with orthogonally protected functional groups in the periphery (hydroxy) and at the focal point (carboxylic acid) is described. It uses the amply available first-generation dendrons with amine and carboxylic ester functions (1) and tetrahydropyranyl-protected hydroxy and carboxylic acid functions (2b, 3), respectively, which are connected via amides by peptide methods. Purification is either done by recrystallization or simple filtration through silica gel and yields the products as analytically pure materials on a several-gram scale (even for G3). ‘The dendrons’ protective groups are proven to be orthogonal (500-MHz NMR) which makes them useful components (building blocks) of a future dendron construction kit for a versatile synthesis of, for example, dendronized polymers.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Full coverage of a hydroxy-substituted poly(para-phenylene) with first- and second-generation dendritic wedges having isocyanate focal points (1996)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 79-84 
    Details
    ISSN: 0323-7648
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Synthesis of the hydroxyethyl-substituted poly(para-phenylene) 2b employing Suzuki polycondensation is described. This PPP derivative is used as a matrix for the attachment of first- and second-generation dendrons of the Fréchet-type with isocyanate functions at the focal point. The degree of coverage is determined from NMR integration to be virtually 100% in both cases.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/actp.1996.010470203
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