Abstract

Preformed or in situ generated monometallic ruthenium-arene complexes with the generic formula RuX(2)(arene)(L) (L = phosphine or N-heterocyclic carbene) are versatile and efficient catalyst precursors for olefin metathesis and atom transfer radical reactions. Their synthesis is usually accomplished using simple and straightforward experimental procedures starting from the [RuCl(2)(p-cymene)](2) dimer. This article retraces their evolution over the past 20 years and highlights similarities and differences with the parallel development of well-defined RuX(2)(=CHR)(L(1))(L(2)) ruthenium-alkylidene catalysts.

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