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Olefin cyclopropanation catalysed by half-sandwich ruthenium complexes

✍ Scribed by Oscar Tutusaus; Sébastien Delfosse; Albert Demonceau; Alfred F Noels; Rosario Núñez; Clara Viñas; Francesc Teixidor

Publisher
Elsevier Science
Year
2002
Tongue
French
Weight
187 KB
Volume
43
Category
Article
ISSN
0040-4039

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✦ Synopsis

Ruthenium complexes of the type [RuX(Cp%)(PPh 3 ) 2 ] (X=Cl and H; Cp%=Cp, Cp*, indenyl, and carboranyl) efficiently catalyse olefin cyclopropanation with diazoesters, and the cis/trans stereoselectivity of the resulting cyclopropanes strongly depends on the Cp% ligand. With [RuCl(Cp*)(PAr 3 ) 2 ] complexes, cyclopropanation competes with the formal carbene insertion into C-H vinyl bonds of styrene, whereas ring-opening metathesis polymerisation takes place with norbornene, lending support to the formation of ruthenium-carbene and ruthenacyclobutanes as intermediates in these reactions.

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