Cyclopropane Derivatives and their Diverse Biological Activities.- Transition Metal Promoted Ring Expansion of Alkynyl- and Propadienylcyclopropanes.- Bicyclopropylidene A Unique Tetrasubstituted Alkene and a Versatile C6-Building Block.- Alkyl 2-Chloro-2-cyclopropylideneacetatesRemarkably Versatile Building Blocks for Organic Synthesis.This current and five previous volumes (Volumes 133, 135, 144, 155, 178) convincingly demonstrate the vast applications of small rings in modern Organic Synthesis. Such applications range from total syntheses of cyclopropyl-group-containing natural products and non-natural biologically active compounds or compounds with other important properties (e.g. liquid crystalline) via syntheses of cyclopropyl analogues of natural and non-natural physiologically active compounds, e.g. peptidomimetics, to the use of cyclopropyl groups as reactive subunits in so-called composite functional groups. This current volume covers a survey of the wide range of biological activities of cyclopropyl-containing compounds, up-to-date comprehensive reviews on the multiple applicabilities of two multifunctional small ring building blocks - methyl-2-chloro-2-cyclopropylidene acetate and bicyclopropylidene - in Organic Synthesis as well as a striking new approach to cyclopentenones from easily accessible 1-ethynylcyclopropanols, which is rather general and favorably complements other cyclopentenone syntheses.This series presents critical reviews of the present position and future trends in modern chemical research Short and concise reports on chemistry, each written by the world renowned experts Still valid and useful after 5 or 10 years Springer Book ArchivesDE