1657-45-0Relevant articles and documents
Immobilization and continuous recycling of photoredox catalysts in ionic liquids for applications in batch reactions and flow systems: Catalytic alkene isomerization by using visible light
Fabry, David C.,Ronge, Meria A.,Rueping, Magnus
, p. 5350 - 5354 (2015)
A catalytic (E)- to (Z)-isomerization of olefins using a photoredox catalyst under mild reaction conditions is presented. A variety of (Z)-alkenes can be prepared in the presence of visible light. A new reaction system allows an easy and efficient scale-up, as well as a continuous flow process in which the photocatalyst is immobilized in an ionic liquid and continuously recycled by simple phase separation. Catalytic (E)- to (Z)-isomerizations of olefins under mild conditions can be achieved by use of a photosensitizer and visible light. A new reaction system such as depicted allows an easy and efficient scale-up, as well as continuous flow processes in which the photocatalyst is immobilized in an ionic liquid and continuously recycled by phase separation.
Heterobimetallic Pd/Mn and Pd/Co complexes as efficient and stereoselective catalysts for sequential Cu-free Sonogashira coupling–alkyne semi-hydrogenation reactions
Baweja, Saral,Clauss, Reike,Gelman, Dmitri,Hey-Hawkins, Evamarie
supporting information, p. 1344 - 1356 (2022/02/03)
A series of heterobimetallic PdII/MII complexes (MII = Mn, Co) were synthesised and tested as precatalysts for sequential Sonogashira coupling–alkyne semi-hydrogenation reactions to form Z-aryl alkenes. The carbometalated heterobimetallic PdII/CoII complex CoPdL3′ demonstrated an apparent cooperative effect compared to the corresponding monometallic counterparts. This compound was identified as a potent single-molecule catalyst for the one-pot Cu-free Sonogashira coupling of aryl bromides with terminal alkynes followed by chemo- and stereoselective semi-hydrogenation of the alkyne intermediate using NH3·BH3 as a hydrogen source. Furthermore, different aromatic substrates have been tested to show the generality of the reaction for the synthesis of Z-alkenes, including biologically active combretastatin A-4. In addition, the homogeneous nature of the catalytically active species was demonstrated.
Recyclable heterogeneous iron supported on imidazolium ionic liquid catalysed palladium and copper-free Heck reaction
Deepa, Manickam,Kalaivani, Kolanjinathan,Parasuraman, Karthikeyan,Selvarasu, Uthayanila
, (2021/09/16)
A natural friendly iron-immobilized on imidazolium supported ionic liquid [Gmim]Cl-Fe (III) was effectively evaluated as a heterogeneous catalyst for Mizoroki-Heck reaction with good to excellent yield under solvent free condition. [Gmim]Cl-Fe (III) showed good activities that were comparable to that of palladium catalysts. Furthermore, this phosphine, copper and palladium- free catalyst was simply recovered from the reaction mixture and recycled seven times.
