Recognizing the critical need for bringing a handy referece work that deals with the most popular reagents in synthesis to the laboratory of practising organic chemists, the Editor selected the best reagents from two sources.  The first is in the Encyclopedia of Reagents for Organic Synthesis (EROS) which was published in 1995.  In the intervening time, new entries have been written by many experts in the field for incorporation in the ever–expanding electronic version of the same work (e–EROS).Chiral Reagents for Asymmetric Synthesis assembles into a single volume many of the optically active reagents and catalysts in use at the present time, with the overall intention to compile in manageable format as much indispensable information as possible.  The selection reflects the sharp increase in demand for enantionmerically pure reagents and products that has taken place over the past twenty–five years.  This development has been driven by synthetic organic chemists working in natural products synthesis and by medicinal chemists working on the development of enantionmerically pure drugs.  These two comunities will find this volume of particular benefit.All the information compiled in this volume is also available in electronic format on Wiley InterScience.  The electronic Encyclopedia for Organic Synthesis (e–EROS) includes all the reagents described in this volume plus many more reagents of other types and for other uses.  e–EROS allows for text and structure search and has many new and updated entries added every year.