1334952-75-8Relevant academic research and scientific papers
New acyclic (π-Allyl)-closo-rhodacarboranes with an agostic CH 3...Rh bonding interaction that operate as unmodified rhodium-based catalysts for alkene hydroformylation
Galkin, Konstantin I.,Lubimov, Sergey E.,Godovikov, Ivan A.,Dolgushin, Fedor M.,Smolyakov, Alexander F.,Sergeeva, Elena A.,Davankov, Vadim A.,Chizhevsky, Igor T.
, p. 6080 - 6084 (2012)
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-(CH 3)2-3,1,2-closo-RhC2B9H 9] (7a) and [3-{(1-3-η3)-1,1,2-trimethylallyl}-1,2- (CH3)2-3,1,2-closo-RhC2B9H 9] (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.
