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1. |
Fractals and Related Hierarchical Models in Polymer Science |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 113-125
Alexander Blumen,
Horst Schnörer,
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摘要:
AbstractPolymer science, an interdisciplinary science well‐rooted in organic chemistry and in materials science, encompasses an inordinate number and diversity of substance classes and thus has far‐reaching applications. Interestingly, polymers also represent a great challenge to the theoreticians, since their theoretical treatment often necessitates appropriate extensions of the classical methods from solid state physics and from statistical physics. Thus, new concepts often have to be invoked when considering the special properties of polymers. In this review we concentrate on one of the modern concepts in the theory of polymers, namely on scaling. Scaling is closely associated with new developments in the field of fractals and of hierarchical structures. Such concepts are invaluable for the modeling of complex geometries and for describing dynamical processes in polymeric materials. Here, we focus on a presentation of these ideas and we outline examples of recent research in which these concepts have been successfully appl
ISSN:0570-0833
DOI:10.1002/anie.199001133
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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2. |
Highly Reactive Intermediates from the Cocondensation Reactions of Iron, Cobalt and Nickel Vapor with Arenes |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 126-137
Ulrich Zenneck,
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摘要:
AbstractIn 1969,P. L. Timmsreported the first preparative cocondensation reactions of metal vapors with organic and inorganic substrates. The use of this technique in preparative chemistry soon spread rapidly, but in recent years there has been less activity in this sector. If metal atom reactions are not utilized primarily for the formation of new products, but for the synthesis of highly reactive intermediates, a new synthetic strategy may be developed. Our aims are reaction sequences which, based on an effective cocondensation reaction, lead gradually and selectively to new substance classes. This principle can be illustrated by the example of the cocondensation products of arenes and iron, cobalt, or nickel vapor, which decompose between −70 and −50°C. The classes of products accessible by this method extend from clusters, through π‐complexes, organophosphorus and organoboron cage compounds to pure organic cycloaddition p
ISSN:0570-0833
DOI:10.1002/anie.199001261
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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3. |
Starburst Dendrimers: Molecular‐Level Control of Size, Shape, Surface Chemistry, Topology, and Flexibility from Atoms to Macroscopic Matter |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 138-175
Donald A. Tomalia,
Adel M. Naylor,
William A. Goddard,
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摘要:
AbstractStarburst dendrimers are three‐dimensional, highly ordered oligomeric and polymeric compounds formed by reiterative reaction sequences starting from smaller molecules—“initiator cores” such as ammonia or pentaerythritol. Protecting group strategies are crucial in these syntheses, which proceed via discrete “Aufbau” stages referred to as generations. Critical molecular design parameters (CMDPs) such as size, shape, and surface chemistry may be controlled by the reactions and synthetic building blocks used. Starburst dendrimers can mimic certain properties of micelles and liposomes and even those of biomolecules and the still more complicated, but highly organized, building blocks of biological systems. Numerous applications of these compounds are conceivable, particularly in mimicking the functions of large biomolecules as drug carriers and immunogens. This new branch of “supramolecular chemistry” should spark new developments in both organic and macromole
ISSN:0570-0833
DOI:10.1002/anie.199001381
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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4. |
Synthesis of Nitrogen Heterocycles by Diastereoselective Intramolecular Aminocarbene Annelation |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 176-177
Karl Heinz Dötz,
Thomas Schäfer,
Klaus Harms,
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ISSN:0570-0833
DOI:10.1002/anie.199001761
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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5. |
Hexaalkynyltriphenylene: A New Type of Nematic‐Discotic Hydrocarbon |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 177-179
Klaus Praefcke,
Bernd Kohne,
Dirk Singer,
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ISSN:0570-0833
DOI:10.1002/anie.199001771
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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6. |
Asymmetric Nucleophilic Acylation via Metalated Chiral Amino Cyanides: Enantioselective Synthesis of 3‐Substituted 4‐Oxoesters by Asymmetric Michael Addition |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 179-181
Dieter Enders,
Peter Gerdes,
Helmut Kipphardt,
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ISSN:0570-0833
DOI:10.1002/anie.199001791
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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7. |
Synthesis of Tetrachloroammonium Hexafluoroarsenate, NCl 4⊕AsF 6⊖ |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 181-183
Rolf Minkwitz,
Dirk Bernstein,
Wolfgang Sawodny,
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ISSN:0570-0833
DOI:10.1002/anie.199001811
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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8. |
Experimental and Theoretical IR Spectra of the 2‐Norbornyl Cation |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 183-185
Wolfram Koch,
Bowen Liu,
Douglas J. DeFrees,
Dionis E. Sunko,
Hrvoj Vancčik,
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ISSN:0570-0833
DOI:10.1002/anie.199001831
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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9. |
Peptides as Conformational Switch: Medium‐Induced Conformational Transitions of Designed Peptides |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 185-187
Manfred Mutter,
René Hersperger,
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ISSN:0570-0833
DOI:10.1002/anie.199001851
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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10. |
X‐Ray Structure Analysis of an Iminium Ion Generated by Grob Fragmentation |
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Angewandte Chemie International Edition in English,
Volume 29,
Issue 2,
1990,
Page 188-189
Sandro Hollenstein,
Thomas Laube,
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ISSN:0570-0833
DOI:10.1002/anie.199001881
出版商:Hüthig&Wepf Verlag
年代:1990
数据来源: WILEY
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