The Pedersen Memorial Issue

This volume is dedicated to the memory of the late Charles J. Pedersen in recognition of his outstanding contribution to scientific research, culminating in his discovery of crown ethers and their remarkable cation complexing properties and his receipt of the 1987 Nobel Prize for Chemistry. The field of macrocyclic chemistry, to a large degree, had its beginnings with Professor Pedersen's discovery. A first-person account of this discovery is given as the first paper in this volume. The growth of the field since the first publication on the subject in 1967 has been enormous. Charles Pedersen lived to see much of this growth. He saw many of his own predictions of possible uses of crown ethers and related macrocycles realized. His work illustrates how one individual can make an enormous difference in science. The effect of his life and work on those who contributed papers for this volume and on many others is appreciated and is acknowledged by several of the authors in their individual papers.

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The Discovery of Crown Ethers.- Tbe Productive Scientific Career of Charles Pedersen (October 3, 1904–0ctober 26, 1989).- Free Energy Perturbation Simulations of Cation Binding to Valinomycin.- An Approach to Channel Type Molecular Structures. 1. Synthesis of Bouquet-Shaped Molecules Based on an [18]-O6 Polyether Macrocycle.- Consequences of the ‘Pedersen Papers’ on Crown Type Chemistry at Würzburg and Bonn Universities: From Heteroaromatic Crowns and Podands to Large Molecular and Crystalline Cavities Including Multisite Receptors. Cascade Molecules, Chromoionophores, Siderophores, Surfactant-Type, and Extreme Ligands.- Conformational Mobility in Chemically-Modified Cyclodextrins.- Högberg Compounds with a Functionalized Box-Like Cavity.- Influence of Quatemary Oniurn Salts, Crown Ethers and Cryptands on Olefin Epoxidations Promoted by HOC1/C1O- in the Presence of Mu(III)-tetrakis(2,6-dichlorophenyl)porphyrin Chloride.- Macrobicyclic Aminals.- Tribracchial Lariat Ethers: Syntheses, Binding, and Formation of an Intramolecular Macroring-Sidearm Complex in the Absence of Any Cation.- Bis(crown ether)s as Na+-K+ ATPase Model in a Liquid Membrane.- Effect of Solvent upon Competitive Liquid-Liquid Extraction of Alkali Metal Cations by Isomeric Dibenzo-16-crown-5-oxyacetie Acids.- Potassium Selective Chromoionophores.- Molecular Dynamics and the Structure of Macrocycles - Solvent Acetonitrile Interactions.- Influence of Solvent Properties on Cation-Macrocycle Complexation: Cesium Cryptates.- Li+(TMPAND)Na-: The First Alkalide Prepared from an Azacage Complexant.- Evaluation of a Direct 1H NMR Method for Determining log K and ?H Values for Crown Ether-Alkylammonium Cation Complexation.- Cation and Anion Coordination Chemistry of Palladium(II) with Polyazacycloalkanes. Thermodynamic and Structural Studies.- The Crystal Structure of Dibenzo-14-Crown-4, a Preorganized Basis of Square Pyramid Coordination for Lithium Ions.- On the Solid-State Conformations of 18-crown-6 Complexes.- Structure and Thermodynamic Aspects of Macrobicyclic Polyether-Metal Ion Interactions.- The Crystal and Molecular Structures of Bridged Spherands: The Host C52H52O8, Its Complex C52H52O8Li+, and the Complexes C50H48O6?Li+ and C52H52O6?Li+.- Complexes between Disubstituted Benzo-15-Crown-5 Ligands and Sodium or Potassium Bromides.- X-Ray Structural Study of a Zine(II) Inclusion Complex of a Phenolate-pendant Cyclam.- Structural Definition of Chemical Templates and the Prediction of New and Unusual Materials.- Announcements.- Author Index.