14371-19-8Relevant articles and documents
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Miller
, p. 6091,6094 (1956)
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Variation on the π-Acceptor Ligand within a RhI?N-Heterocyclic Carbene Framework: Divergent Catalytic Outcomes for Phenylacetylene-Methanol Transformations
Galiana-Cameo, María,Passarelli, Vincenzo,Pérez-Torrente, Jesús J.,Di Giuseppe, Andrea,Castarlenas, Ricardo
, p. 2947 - 2957 (2021/07/16)
A series of neutral and cationic rhodium complexes bearing IPr {IPr=1,3-bis-(2,6-diisopropylphenyl)imidazolin-2-carbene} and π-acceptor ligands are reported. Cationic species [Rh(η4-cod)(IPr)(NCCH3)]+ and [Rh(CO)(IPr)(L)2]+ (L=pyridine, CH3CN) were obtained by chlorido abstraction in suitable complexes, whereas the cod-CO derivative [Rh(η4-cod)(IPr)(CO)]+ was formed by the carbonylation of [Rh(η4-cod)(IPr)(NCCH3)]+. Alternatively, neutral derivatives of type RhCl(IPr)(L)2 {L=tBuNC or P(OMe)3} can be accessed from [Rh(μ-Cl)(η2-coe)(IPr)]2. In addition, the mononuclear species Rh(CN)(η4-cod)(IPr) was prepared by cyanide-chlorido anion exchange, which after carbonylation afforded the unusual trinuclear compound [Rh{1κC,2κN-(CN)}(CO)(IPr)]3. Divergent catalytic outcomes in the phenylacetylene-methanol transformations have been observed. Thus, enol ethers, arisen from hydroalkoxylation of the alkyne, were obtained with neutral Rh?CO catalyst precursors whereas dienol ethers were formed with cationic catalysts. Variable amounts of alkyne dimerization, cyclotrimerization or polymerization products were obtained in the absence of a strong π-acceptor ligand on the catalyst.
Intermolecular Hydroalkoxylation of Terminal Alkynes Catalyzed by a Dipyrrinato Rhodium(I) Complex with Unusual Selectivity
Lam, Raphael H.,Walker, D. Barney,Tucker, Matthew H.,Gatus, Mark R. D.,Bhadbhade, Mohan,Messerle, Barbara A.
supporting information, p. 4312 - 4317 (2015/09/22)
An operationally simple and atom-economical method for the E-selective preparation of enol ethers is described. A novel dicarbonyl(5-phenyldipyrrinato)rhodium complex, 2, was prepared in four synthetic steps, characterized by X-ray crystallography and NMR
Transition metal-free stereoselective α-vinylation of cyclic ketones with arylacetylenes in the superbasic catalytic triad potassium hydroxide/tert-butyl alcohol/dimethyl sulfoxide
Trofimov, Boris A.,Schmidt, Elena Yu.,Zorina, Nadezhda V.,Ivanova, Elena V.,Ushakov, Igor A.,Mikhaleva, Al'Bina I.
supporting information; experimental part, p. 1813 - 1818 (2012/08/13)
A stereoselective α-vinylation of cycloaliphatic ketones with arylacetylenes under the transition metal-free conditions has been developed. The reaction is promoted by the superbasic catalytic triad potassium hydroxide/tert-butyl alcohol/dimethyl sulfoxide (80-110 °C, 1-2 h) to afford mainly (E)-β,γ-ethylenic ketones, their (E)-α,β-isomers being minor products, in up to 83% total yield. Copyright