The present volume belongs to a series of handbooks dealing with organorhenium com pounds. 1t covers the Literature up to the end of 1993, but some more recent data published in 1994 have also been considered. Patents, conference reports, and dissertations generally were not reviewed. An empirical formula index, a Ligand formula index, and a transition metals cross reference table provide ready access to all compounds covered. The following comments may be helpful for rapidly finding the compound(s) you wish to get information of. ln the Gmelin series "Organometallic Compounds" the term "organometallic" is re served for all compounds containing at Least one carbon-to-metal bond. For all volumes published in this series, see p. VI. The series on organorhenium compounds started with the description of mononuclear compounds in Volumes 1 to 4 (Volume 4 is still to be published) and continues with the present Volume 5 describing all binuclear organorhenium compounds having 0 to 10 CO groups as Ligands, except (C0) Re which will be included in the next volume together 10 2 with all other binuclear compounds having carbenes, isonitriles, and "L Ligands (n > 1) bonded to rhenium as weiL as all other polynuclear organorhenium compounds.

Editor-in-chief: Adolf Slawisch
Index by: R. Bohrer, B. Kalbskopf, H.-J. Richter-Ditten