Details

Autor(en) / Beteiligte

• Galkin, Konstantin I
• Lubimov, Sergey E
• Godovikov, Ivan A
• Dolgushin, Fedor M
• Smol’yakov, Alexander F
• Sergeeva, Elena A
• Davankov, Vadim A
• Chizhevsky, Igor T

Titel

New Acyclic (π-Allyl)-closo-rhodacarboranes with an Agostic CH3···Rh Bonding Interaction That Operate as Unmodified Rhodium-Based Catalysts for Alkene Hydroformylation

Ist Teil von

• Organometallics, 2012-09, Vol.31 (17), p.6080-6084

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A series of new agostic (CH3···Rh) (π-allyl)-closo-rhodacarboranes (π-allyl = 1,1-dimethylallyl, 1,2-dimethylallyl, 1,1,2-trimethylallyl, 1,2,3-trimethylallyl), stable in the solid state, have been synthesized via one-pot reactions between the K+ salts of the [7-R-8-R′-7,8-nido-C2B9H10]− monoanions (1a, R = R′ = Me; 1b, R,R′ = μ-(o-xylylene); 1c, R,R′ = μ-(CH2)3) and the di-μ-chloro cyclooctene rhodium dimer [(η2-C8H14)4Rh2(μ-Cl)2] (2) in the presence of a 3-fold excess of the conjugated 1,3-dienes 2-methylbuta-1,3-diene (isoprene, 3), 2,3-dimethylbuta-1,3-diene (4), and 3-methylpenta-1,3-diene (5). The agostic structures of [3-{(1–3-η3)-1,1-dimethylallyl}-1,2-(CH3)2-3,1,2-closo-RhC2B9H9] (7a) and [3-{(1–3-η3)-1,1,2-trimethylallyl}-1,2-(CH3)2-3,1,2-closo-RhC2B9H9] (8a) have been unambiguously confirmed by single-crystal X-ray diffraction studies. Two of these π-allyl complexes prepared were evaluated for their efficacy in hydroformylation of the model alkenes under syngas (CO/H2) using supercritical carbon dioxide (scCO2) as the solvent, and both display excellent conversion and high regioselectivity in the formation of aldehyde products.