Rhodium(II)-Catalyzed Nondirected Oxidative Alkenylation of Arenes: Arene Loading at One Equivalent
作者:Harit U. Vora、Anthony P. Silvestri、Casper J. Engelin、Jin-Quan Yu
DOI:10.1002/anie.201310539
日期:2014.3.3
bimetallic RhII catalyst promoted the CH alkenylation of simple arenes at 1.0 equivalent without the use of a directing group. A phosphine ligand as well as cooperative reoxidation of RhII with Cu(TFA)2 and V2O5 proved essential in providing monoalkenylated products in good yields and selectivities, especially with di‐ and trisubstituted arenes.
双金属的Rh II催化剂促进与c H在1.0当量,而无需使用定向基团的简单的芳烃的烯基化。膦配体以及Rh II与Cu(TFA)2和V 2 O 5的协同再氧化被证明对于以高收率和选择性提供单烯基化产物至关重要,特别是对于二取代和三取代的芳烃。
Polyacrylonitrile fiber mat-supported palladium catalyst for Mizoroki-Heck reaction in aqueous solution
fiber mats (Pd/PAN) was prepared by electrospinning. The catalytic activity and recyclability of the microwave‐assisted Pd/PAN fiber mats were examined for the Mizoroki–Heckcross‐coupling of aryl iodides with three different acrylates in aqueous solution. The morphology of the prepared Pd/PAN fiber mats was characterized by scanning electron microscopy. The large size of the PAN fiber mat‐supported palladium
environmentally-benign aqueoussolution due to the highly hydrophilic hydroxyl and amino functional groups of chitosan. The large size of the microsphere structure can greatly facilitate separation and recycling of the expensive and toxic palladiumcatalysts from the reaction mixture and the recovered Pd/PCMS catalyst can preserve the catalytic activity and selectivity for the Heck reaction without any observable
Homeopathic Ligand-Free Palladium as a Catalyst in the Heck Reaction. A Comparison with a Palladacycle
作者:André H. M. de Vries、Jan M. C. A. Mulders、John H. M. Mommers、Huub J. W. Henderickx、Johannes G. de Vries
DOI:10.1021/ol035184b
日期:2003.9.1
[reaction: see text] Ligand-free Pd(OAc)(2) can be used as a catalyst in the Heck reaction of aryl bromides as long as the amount of catalyst is kept between 0.01 and 0.1 mol %. At higher concentrations palladium black forms and the reaction stops. The actual catalyst is monomeric. Palladacycles merely serve as a source of ligand-freepalladium in Heck reactions of aryl bromides.
2-Hydroxy-1,10-phenanthroline vs 1,10-Phenanthroline: Significant Ligand Acceleration Effects in the Palladium-Catalyzed Oxidative Heck Reaction of Arenes
作者:Cheng-Hao Ying、Shao-Bai Yan、Wei-Liang Duan
DOI:10.1021/ol4033804
日期:2014.1.17
A series of bidentate monoanionic nitrogen ligands were designed and applied in the Pd-catalyzed oxidative Heck reaction of arenes with alkenes. Significant ligand-accelerated effects were observed, and direct C-H functionalized products were formed in high yields with meta-selectivity.