Oligocyclopentadienyl Transition Metal Complexes

Abstract Synthesis, characterization, and reactivity studies of olig­ocyclopentadienyl transition metal complexes, namely those of fulvalene, tercyclopentadienyl, quatercyclopentadienyl, and pentacyclopentadienyl(cyclopentadienyl) are the subject of this account. Thermal-, photo-, and redox chemistries of homo- and heteropolynuclear complexes are described. 1 Introduction 2 Fulvalene Complexes 2.1 Homodinuclear Fulvalene Metal Carbonyls 2.1.1 Synthesis and Structural Characterization 2.1.2 Reactivity 2.1.3 Conclusions 2.2 Heterodinuclear Fulvalene Metal Complexes 2.2.1 Synthesis 2.2.2 Reactivity 2.2.3 Conclusions 3 Tercyclopentadienyl Metal Complexes 3.1 Synthesis and Structural Characterization 3.2 Reactivity 3.2.1 Anionic Charge Transfer 3.2.2 Radical Electron Transfer 3.2.3 Methyl Transfer 3.2.4 Some Tantalizing Photochemical Experiments 3.2.5 Conclusions 4 Quatercyclopentadienyl Metal Complexes 5 Penta(cyclopentadienyl)cyclopentadienyl MetalComplexes 5.1 Synthesis and Structural Characterization 5.2 Reactivity 5.3 Conclusions 6 Outlook