This series provides a continuing critical review of the literature concerned with mechanistic aspects of inorganic and organometallic reactions in solu- tion, with coverage over the whole area being complete in each volume. The format of this second volume is very similar to that of the first, with material arranged according to reaction type and compound type along generally accepted lines. Papers discussed are selected on the basis of relevance to the elucidation of reaction mechanisms but may also include results of a nonkinetic nature, such as stereochemical studies and product ratios, when useful mechanistic information can be deduced. In this volume extra space has been given to areas concerned with electron transfer processes and substitution reactions of inert complexes, and to improve convenience for the reader the text has been further divided to form three additional chapters. Electron transfer processes are discussed in three chapters: "General and Theoretical," "Reactions between Two Complexes," and "Metal-Ligand Redox Reactions," while six chapters are concerned with substitution and related reactions. Here reactions of inert chromium and cobalt complexes are discussed in separate chapters. The period of literature coverage is January 1981 through June 1982 inclusive and in a few instances, where delays in delivery of journals have been encountered, the issues not covered will be included in the next volume.