Organometallics, highly reduced

Compounds containing niobium or tantalum in negative formal oxidation states -I and -III are mainly metal carbonyl anions. Although these are organometallic derivatives, the report of efficient procedures for the synthesis of [M(CO)6] since the review of Labinger8 merits mention, as it can be anticipated that these highly reduced and reactive species will be important precursors of a large variety of new coordination compounds and metal clusters. 

A. Syntheses and Characterizations The Reductive Labilization Strategy for the Preparation of Highly Reduced Organometallics... 

I wish to express gratitude and appreciation to all of my co-workers who are listed as joint authors in the references, to the Petroleum Research Fund, administered by the American Chemical Society, and to the National Science Foundation for continuing generous support of this research on highly reduced organometallics. Special thanks are due to Kelly V. Beamer for expert assistance with the manuscript. 

ELLIS Techniques in the Handling of Highly Reduced Organometallics 35... 

This group seldom manages more than a handful of papers for this report and 1993 was no exception. Ellis and coworkers, as part of a long series on highly reduced organometallics, have published a study on the carbonyl hydrides of titanium new cationic Zr(IV) carbonyl complexes are reported and carbonyl adducts of open titanocenes are the subject of a paper by Wang et ai. ... 

RE one-electron redox chemistry is now emerging, driven by the highly reducing nature of the RE + — RE + + e couple (Table 1), and some examples of one-electron redox chemistry in organometallic RE chemistry are described below and illustrated in Figure 17 in order to give a flavor of the area and to demonstrate its breadth and potential capability. 

Other relevant material is contained in reviews on homogeneous catalysis of organic reactions by transition metal complexes, highly reduced metal carbonyl complexes, phosphine complexes of the early transition metal complexes and the lanthanoids, metal NMR spectra of transition metal organometallic systems, the coordination chemistry of C-Nitroso-compounds, mono-Cp halide complexes of the d- and/-block, and organometallic chemistry in the gas phase. o... 

Organometallic Compounds. Mononuclear carbon monoxide complexes of palladium are relatively uncommon because of palladium s high labihty, tendency to be reduced, and competing migratory insertion reactions in the presence of a Pd—C bond (201). A variety of multinuclear compounds... 

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