New selectivities from old catalysts. Occlusion of Grubbs’ catalysts in PDMS to change their reactions
作者:M. Brett Runge、Martin T. Mwangi、Ned B. Bowden
DOI:10.1016/j.jorganchem.2006.09.022
日期:2006.12
dissolved in methylene chloride also react by olefin isomerization with occluded catalysts. Eleven examples of substrates that exhibit dual reactivity by undergoing olefin isomerization with occluded catalysts and olefin metathesis with catalysts dissolved in methylene chloride are reported. Most of these substrates have olefins with allylic phosphine oxides, carbonyls, or ethers. Control experiments demonstrate
A concise synthesis of carpanone using solid-supported reagents and scavengers
作者:Ian R. Baxendale、Ai-Lan Lee、Steven V. Ley
DOI:10.1039/b203388g
日期:2002.8.8
Polymer-supported reagents have been applied to the synthesis of the natural product carpanone resulting in a clean and efficient synthesis without the requirement for conventional purification techniques. A new polymer-supported transition metal isomerisation catalyst is also reported.
A Highly Active Cationic Ruthenium Complex for Alkene Isomerisation: A Catalyst for the Synthesis of High Value Molecules
作者:Simone Manzini、David J. Nelson、Steven P. Nolan
DOI:10.1002/cctc.201300396
日期:2013.10
You′ve been valorized! A novel cationic ruthenium complex is shown to be efficient in the isomerization of important feedstocks derived from essential oils, which can then be functionalized through olefin metathesis.
Stereoselective Alkene Isomerization over One Position
作者:Casey R. Larsen、Douglas B. Grotjahn
DOI:10.1021/ja3036477
日期:2012.6.27
Although controlling both the position of the double bond and E:Z selectivity in alkene isomerization is difficult, 1 is a very efficient catalyst for selective mono-isomerization of a variety of multifunctional alkenes to afford >99.5% E-products. Many reactions are complete within 10 min at room temperature. Even sensitive enols and enamides susceptible to further reaction can be generated. Catalyst
Radical Cation Diels–Alder Cycloadditions by Visible Light Photocatalysis
作者:Shishi Lin、Michael A. Ischay、Charles G. Fry、Tehshik P. Yoon
DOI:10.1021/ja2093579
日期:2011.12.7
Ruthenium(II) polypyridyl complexes promote the efficient radicalcation Diels-Alder cycloaddition of electron-rich dienophiles upon irradiation with visible light. These reactions enable facile [4 + 2] cycloadditions that would be electronically mismatched under thermal conditions. Key to the success of this methodology is the availability of ligand-modified ruthenium complexes that enable rational
钌 (II) 多吡啶基配合物在可见光照射下促进富电子亲二烯体的有效自由基阳离子 Diels-Alder 环加成反应。这些反应使 [4 + 2] 环加成能够在热条件下发生电子失配。这种方法成功的关键是配体修饰的钌配合物的可用性,这些配合物能够合理调整催化剂的电化学性能,而不会显着扰乱系统的整体光物理性能。