Composite reverse osmosis and nanofiltration membranes

This report describes efforts to develop transition-metal-catalyzed acetylene cyclization as an attractive and versatile synthetic tool. Syntheses of indans, tetralins, anthraquinones, benzocyclobutenes, polycycles and heterocycles are discussed. In particular, cobalt-catalyzed cyclooligomerization of acetylenes is described with a brief discussion of reaction mechanisms. (DDA)

Transition-metal-catalyzed acetylene cyclizations in organic synthesis

Transition metal complexes in which hydrocarbons serve as σ,σ-, σ,π- or π,π-bound bridging ligands are currently of great interest. This review presents efficient and directed syntheses for such compounds, which often have very aesthetic structures. These reactions are among the most important reaction types in modern organometallic chemistry. They can be a useful aid for the synthesis of tailor-made compounds, for example, for models of catalytic processes and, specifically, for the construction of heterometallic compounds. We will discuss reactions of electrophilic complexes with nucleophilic ones, numerous transformations of (functionalized) hydrocarbons with metal complexes, the currently very topical complexes with bridging acetylide and carbide ligands, and organometallic polymers, which can be expected to have interesting and novel materials properties. Chisholm1 has described the importance of these complexes as follows: “Central to the development of polynuclear and cluster chemistry are bridging ligands and central to organometallic chemistry are metal–carbon bonds. Thus bridging ligands hold a pivotal role ins the development of Binuclear and polynuclear organometallic chemistry”.

Methods for the Synthesis of μ‐Hydrocarbon Transition Metal Complexes without Metal–Metal Bonds

Applications of metal carbonyl anions in the synthesis of ususual organometallic compounds

Cyclobutarenes and Related Compounds

Organometallic chemistry of the transition metals XXIII. Some indenyl and fluorenyl derivatives of manganese carbonyl

Pentamethylcyclopentadienyl derivatives of transition metals : V. Some pentamethylcyclopentadienyl and isopropenyl-tetramethylcyclopentadienyliron carbonyl derivatives

Pentamethylcyclopentadienyl derivatives of transition metals : III. Some reactions of pentamethylcyclopentadienyl-metal carbonyl derivatives of cobalt and manganese☆

Organonitrogen derivatives of metal carbonyls V. Some pyrrolyl derivatives of manganese carbonyl

Reactions of alkali metal derivatives of metal carbonyls

A. Efraty

Papers

Organometallic chemistry of the transition metals XXIII. Some indenyl and fluorenyl derivatives of manganese carbonyl

Pentamethylcyclopentadienyl derivatives of transition metals : V. Some pentamethylcyclopentadienyl and isopropenyl-tetramethylcyclopentadienyliron carbonyl derivatives

Pentamethylcyclopentadienyl derivatives of transition metals : III. Some reactions of pentamethylcyclopentadienyl-metal carbonyl derivatives of cobalt and manganese☆

Organonitrogen derivatives of metal carbonyls V. Some pyrrolyl derivatives of manganese carbonyl

Reactions of alkali metal derivatives of metal carbonyls