E.O. Fischer received the Nobel prize in 1973 for the investigations of complexes with a formal metal atom-carbon double bond. Among these, the Iron-Carbene species is readily available and has proved to be a versatile reagent in organic syntheses. It is rather simple to tune the electronicproperties of this Fischer Carbene and to control reactivity and stereospecificity of the reagent in, e.g., cyclopropanation reactions. This first volume of the "Scripts in Inorganic and Organome- tallic Chemistry" addresses graduate students in the fields ofcoordination compounds and organic synthesis. It covers the chemistry and structural aspects of iron-carbon com- pounds with a iron-carbon double bond. The first part deals with the carbene moiety, the second with vinylidene ligands.

This volume 8 is the fourth in a series dealing with organomolybdenum compounds. An Empirical Formula Index and a Ligand Formula Index provide ready access to the compounds covered. Volume 5 describes mononuclear organomolybdenum compounds with isocyanide, 3 4 carbene, carbyne, alkynyl, alkene, alkyne, L, and L ligands with and without additional CO groups. Volume 6 starts the description of mononuclear organomolybdenum compounds with 5 one L Ligand, a Ligand bonded to molybdenum by five carbon atoms. The compounds contain either zero or one CO group bonded to the molybdenum atom. Volume 7 continues the 5 description of L-molybdenum compounds containing two CO groups, but no additional nl 5 ligands. This volume describes L-molybdenum compounds with two CO groups and additional 1 4 L to L ligands. Following the nomenclature used in this series of organomolybdenum com pounds, nl is an organic Ligand bonded by n C atoms to molybdenum, and mo is an electron 2 donor Ligand with m donor electrons. Thus 0 denotes a Ligand such as PR . 3 Many of the data, particular those in tables, are given in an abbreviated form without units; for explanations see p. X. Additional information, if necessary, is given before the individual table. Frankfurt am Main Manfred Winter November 1992 Wolfgang Petz X Remarks on Abbreviations and Dimensions Many compounds in this volume are presented in tables in which numerous abbreviations are used, the dimensions are omitted for the sake of conciseness. This necessitates the following clarifications.

FoLLowing the first synthesis of an organoLead compound by Loewig in 1852, progress sLowed markedLy in organoLead chemistry. Then, the discovery of the outstanding performance of organoLead compounds as antiknock additives to automobiLe gasoline turned organoLead chemistry into one of the main areas of organometallic chemistry. Large-scaLe industriaL procedures for synthesizing tetraethyLLead and other tetraaLkyLLead compounds and entireLy new techniques, such as handling Large amounts of sodium-Lead aLLoys or eLectroLyzing Grignard soLutions, were deveLoped, and many other industriaL projects as weLL as toxicoLogicaL and environmentaL studies brought a tremendous increase of knowLedge. Therefore, a compiLation of the avaiLabLe data in organoLead chemistry seemed justified. In the present series onLy compounds containing at Least one Lead-to-carbon bond are considered; the simpLe inorganic cyanides, carbides, etc. , are excLuded. The materiaL is organized as foLLows: 1. MononucLear compounds (compounds containing onLy one Lead atom) 2. DinucLear compounds 3. OLigo-and poLynucLear compounds Within the group of mononucLear compounds the materiaL is arranged in a simiLar way as in the GmeLin voLumes of the sister eLement tin, that is: 1. 1 * Compounds containing four Pb-C bonds 1. 2 Compounds containing Pb-H bonds 1. 3 Compounds containing bonds between Lead and group 17 eLements 1. 4 Compounds containing bonds between Lead and group 16 eLements 1. 5 Compounds containing bonds between Lead and group 15 eLements 1. 6 Compounds containing bonds between Lead and Si, Ge, or Sn 1.

The present volume contains all compounds in which at least one indium-carbon bonding interaction can be assumed. The compilation starts with the simplest compound of trivalent indium, In(CHh, and ends with studies about the interaction of indium with carbon monoxide 3 in an argon matrix. Literature coverage is intended to be complete to spring 1991 with various examples up to September 1991. The arrangement is closely related to that of the organogallium volume and documents the similarities between the two elements. Following the indium triorganyls and their adducts with Lewis bases in Section 1, the broad field of compounds of the general type R ln- n 3 n (n = 1, 2) is treated in sections 2 to 9; X represents a ligand bonded with a non-carbon atom to the indium atom. The arrangement of the various ligands follows the order group 17, 16, 15, etc. elements, with few compounds having direct indium-transition metal bonds. Ionic species, predominantly [R lnX -n]-compounds (n = 1 to 4), close the series of trivalent n 4 organoindium compounds and are collected in Section 11. Compounds of formally low valent indium (In", Ini, and Ino), with one R 1nlnR species having an In-In bond, form Section 12; 2 2 an extended chapter therein is dedicated to the young area of Cp*ln compounds in which i formalln is coordinated in an T] 5 manner.