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Olefin cyclopropanation catalysed by novel ruthenium-arene complexes containing phosphines with pendent arenes

✍ Scribed by François Simal; Dominique Jan; Albert Demonceau; Alfred F. Noels

Publisher
Elsevier Science
Year
1999
Tongue
French
Weight
268 KB
Volume
40
Category
Article
ISSN
0040-4039

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✦ Synopsis

Ruthenium-arene complexes containing phosphines with pendent aryl groups [RuCI2(rl6-p-cymene) -(PCy2(CH2)3Ar)], Ar = C6H5 and 3,5-(CH3)2-C6H 3 (1 and 3), and the resulting chelating complexes [RuC12(PCy2-(CH2)3-'q6-Ar)] (2 and 4) mediate the cyclopropanation of olefins with ethyl diazoacetate. Comparison of the reactivity patterns of these complexes indicates that p-cymene disengagement is likely the key step in the reactions catalysed by non-chelating complexes 1 and 3.

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