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. Compa
Cyclopropanation of activated olefins catalysed by Ru-phosphine complexes
β Scribed by A. Demonceau; E.Abreu Dias; C.A. Lemoine; A.W. Stumpf; A.F. Noels; C. Pietraszuk; J. Gulinski; B. Marciniec
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- French
- Weight
- 238 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0040-4039
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π SIMILAR VOLUMES
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 ]
Novel ruthenium complexes with anionic phosphine ligands were found to be efficient in the catalytic cyclopropanation reaction of olefins with ethyl diazoacetate.
Bis(imido) chromium(VI) complexes are efficient catalysts for promoting the cyclopropanation of activated monosubstituted olefins with ethyl diazoacetate. 2,2'-Disubstituted activated olefins and non-activated ~-and cyclo-olefins, however, are much less reactive.
The first set of rhodium(I) complexes 1-3 has been shown to be active for the cyclopropanation of olefins with diazoacetates.
## Abstract **Summary:** Diphosphane complexes of iron(II) are active catalysts for the polymerisation of methyl acrylate (MA) monomers in the presence of methylaluminoxane (MAO). High molar mass atactic MA polymers ($\overline M \_{\rm n}$ββΌβ200 kg/mol) were obtained under mild conditions with rel