Conversion of Carbonyl Compounds to Olefins
<i>via</i>
Enolate Intermediate
作者:Zhi‐Chao Cao、Pei‐Lin Xu、Qin‐Yu Luo、Xiao‐Lei Li、Da‐Gang Yu、Huayi Fang、Zhang‐Jie Shi
DOI:10.1002/cjoc.201800554
日期:2019.8
A general and efficient protocol to synthesize substituted olefins from carbonyl compounds via nickel catalyzed C—O activation of enolates was developed. Besides ketones, aldehydes were also suitable substrates for the presented catalytic system to produce di‐ or tri‐ substituted olefins. It is worth noting that this approach exhibited good tolerance to highly reactive tertiary alcohols, which could
Palladium-catalyzed cross-coupling reactions of vinyl and aryl triflates with tetraarylborates
作者:Pier Giuseppe Ciattini、Enrico Morera、Giorgio Ortar
DOI:10.1016/s0040-4039(00)61293-5
日期:1992.8
Sodiumm tetraarylborates 2 have been found to couple efficiently with vinyl and aryltriflates 1 in the presence of a palladium(0) catalyst to afford arylalkenes and biaryls 3 in good yields and under mild conditions.
Selective Heck Arylation of Cyclohexene with Homogeneous and Heterogeneous Palladium Catalysts
作者:Ewa Mieczyńska、Anna M. Trzeciak
DOI:10.3390/molecules15042166
日期:——
Palladium catalysts containing Pd(II) supported on Al2O3 and alumina-based mixed oxides, Al2O3-ZrO2, Al2O3-CeO2, and Al2O3-Fe2O3, are very effective in the Heck coupling of iodobenzene with cyclohexene in DMF solution. The best results, up to 81% of monoarylated products with a selectivity to 4-phenylcyclohexene (3) close to 90% were obtained with KOH as a base. The catalytic activity of palladium
of 1,n-dicarbonyl compounds through the homolytic C–C bond cleavage of unstrained carbocyclic and heterocyclic ring systems. This method exhibits a lot of synthetic advantages including mild conditions, simple operation, and convenience of amplification. Mechanistic studies support the generation of peroxy radical species via oxygen capture followed by radical fragmentation.
Oxidative Cleavage of Alkenes Using an In Situ Generated Iodonium Ion with Oxone as a Terminal Oxidant
作者:Prem P. Thottumkara、Thottumkara K. Vinod
DOI:10.1021/ol1023807
日期:2010.12.17
A facile and operationally convenient catalytic procedure for oxidative cleavage of alkenes is described. In situ formed [hydroxy(4-carboxyphenyl)iodonium]ion, 2, from the oxidation of 4-iodobenzoic acid, 1, has been shown to facilitate the cleavage of a variety of alkenes in presence of Ozone as a co-oxidant. Optimization of the reaction conditions using 1-phenyl-1-cyclohexene, 3, and the competitive oxidative cleavage of different substrates using the optimized conditions has uncovered important mechanistic details of the reaction.