Cyclic Polymers, Second Edition

During the preparation of this chapter, the author had the privilege of holding a Humboldt Stipendium at the University of Magdeburg and a Gauss Visiting Professorship at the University of G ttingen, Germany and to use their library facilities. Gratitude is expressed to the Alexander von Humbold Stiftung and to G ttinger Akademie der Wissenschaften for the grants, and to Professors H.W. Roesky and F.T. Edelmann for their hospitality.