Carbon Rich Compounds II: Macrocyclic Oligoacetylenes and Other Linearly Conjugated Systems (Topics in Current Chemistry (201))

The definition of Carbon Rich Compounds applied in this as in the previous volume (TCC Volume 196) of this series on the same general topic comprises carbon skeletons with a carbon to hydrogen ratio of 1:(kleiner gleich 1), which ultimately implies all-carbon compounds (i.e. carbon allotropes). The current volume covers modern methods for the coupling - mostly metal catalyzed - of subsystems consisting of double bonds, cyclopropyl groups, arenes, and metal-complexed pi-systems with acetylene and diacetylene units. The resulting structures range from macrocycles, including those with all sorts of linkers between the acetylene and diacetylene units, to conducting polymers and light-emitting materials. Wherever appropriate, chemical transformations of these intriguing compounds and materials are discussed as well. Considering the high level of our knowledge concerning covalent bond formation in the organic chemistry of molecules, our understanding of the principles involved in organic solid design is almost in its infancy. While chemists today are able to synthesize organic molecules of very high complexity using sophisticated methods of preparation, they lack general approaches enabling them to reliably predict organic crystalline or solid structures from molecular descriptors - no matter how simple they are. On the other hand, nearly all the organic matter surrounding us is not in the single-molecule state but aggregated and condensed to form liquid or solid molecular assemblages and structural arrays giving rise to the appearances and properties of organic compounds we usually observe. Obviously, the electrical, optical or magnetic properties of solid organic materials that are important requirements for future technologies and high-tech applications, as well as the stability and solubility behavior of a medicament depend on the structure of the molecule and the intramolecular forces, but even more decisively on the intermolecular forces, i. e. the packing structure of the molecules to which a general approach is lacking. This situation concerned ]. Maddox some years ago to such a degree that he described it as'one of the continuing scandals in the physical sciences'[see (1998) Nature 335:201; see also Ball, P. (1996) Nature 381:648]. The problem of predicting organic solid and crystal structures is very dif- cult. Annotation The lively interest in organic solids stems from our increasing ability to manipulate and tune the properties of organic and organometallic materials (e.g. nonlinear behavior or electrical conductivity) by systematic variations of the molecular components. New insight derived from modern supramolecular chemistry are also allowing molecular level control of solid-state structure with the arrangement of functional molecular components into a defined solid architecture. Examples include the creation of nanoporous host lattices containing functional guest molecules and of defined nanomaterials. In this book, leading experts in the field give a state-of the art overview of our current knowledge and of future prospects, with chapters on directional aspects of intermolecular interactions, supramolecular synthon approaches, hydrogen-bonded tape, ribbon and sheet motifs, designed organic zeolite analogues, and crystalline polymorphism Dendrimers are a class of highly branched molecules that combine the properties of polymers as well as small discrete molecules. One classified among the exotic molecules of chemistry, dendrimers have attracted considerable attention in recent years, as their unique host/guest properties and their capability of being functionalized in the periphery as well in the core have led to new materials with a great potential for applications. This volume presents the state of art in this blossoming research area, written by pioneers in the fields. Covering the synthetic, supramolecular, stereochemical, host/guest and polymer chemistry of dendritic and hyperbranched molecules, this volume explains both theoretical and practical aspects, including chirality reactivity, mechanism, material properties and biological relevance. It is the most comprehensive and authoritative review of the area available Annotation Dendrimers are a class of highly branched molecules that combine the properties of polymers and small discrete molecules. One classified among the exotic molecules of chemistry, dendrimers have attracted considerable attention in recent years, as their unique host/guest properties and their capability of being functionalized in the periphery as well in the core have led to new materials with a great potential for applications. This volume presents the state of art in this blossoming area, written by pioneers in the fields. Covering the synthetic, supramolecular, stereochemical, host/guest and polymer chemistry of dendritic and hyperbranched molecules, this volume explains both theoretical and practical aspects, including chirality reactivity, mechanism, material properties and biological relevance

Carbon Rich Compounds are defined here as carbon skeletons with a carbon to hydrogen ratio of 1:(=<1) which includes all-carbon compounds (i.e. carbon allotropes). The current volume covers modern methods for the preparation and transformation of polycyclic aromatic compounds including substructures of C60-fullerene and novel highly complex cyclophanes. A graph theoretical treatment presents a substitution rule, allowing the description of already existing structures and also the definition of new challenging synthetic targets. In the second part of this volume, the synthesis and unique chemistry of oligocyclic compounds consisting of five- and six-membered rings, so-called centro-polyhydrindanes as well as oligoquinanes, in particular highly unsaturated ones, are discussed.

Macrocyclic Structurally Homoconjugated Oligoacetylenes: Acetylene- and Diacetylene-Expanded Cycloalkanes and Rotanes....Pages 1-42 Cyclic and Linear Acetylenic Molecular Scaffolding....Pages 43-79 Macrocyclic Oligo(phenylacetylenes) and Oligo(phenyldiacetylenes)....Pages 81-130 Carbon-Rich Molecular Objects from Multiply Ethynylated π -Complexes....Pages 131-161 Oligo- and Polyarylenes, Oligo- and Polyarylenevinylenes....Pages 163-222 Annotation Carbon Rich Compounds are defined here as carbon skeletons with a carbon to hydrogen ratio of 1:(=centro-polyhydrindanes as well as oligoquinanes, in particular highly unsaturated ones, are discussed Macromolecules have large molecular masses, but their bulk densities are comparable with those of small molecules of similar composition. Volume Editor, E. Weber ; With Contributions By Y. Aoyama ... [et Al.]. Includes Bibliographical References (p. 204-220) And Index.