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SUMMARY:Chemical Photocatalysis: More Energy\, new Intermediates and Heter
 ogeneous Catalysts
DTSTART:20211014T171500
DTEND:20211014T181500
DTSTAMP:20260916T065537Z
UID:4446862f932dad709f2c6a8808e28d6a3684b3b84397964c215f04fe
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Burkhard Koenig\, Regensburg University\, Germany http:/
 /www-oc.chemie.uni-regensburg.de/koenig/index.html\nChemical Photocatalysi
 s: More Energy\, new Intermediates and Heterogeneous Catalysts\nBurkhard K
 önig\nFaculty of Chemistry and Pharmacy\, University of Regensburg\, D-93
 040 Regensburg\, Germany\; burkhard.koenig@ur.de\nSensitized photochemistr
 y evolved over the last 20 years into an enabling technology for the synth
 esis of complex organic molecules due to new mechanistic concepts and adva
 nces in light sources.1 The use of visible light and dual catalytic system
 s allow now challenging transformations with good selectivity under mild r
 eaction conditions.2 Although light is an ideal reagent for chemistry (che
 ap\, safe\, can be used in large excess) it comes with certain limitations
 :\n1. Compared to chemical bond energies\, the energy of a visible light p
 hoton is small and photocatalytic activation of stronger bonds therefore r
 equires special strategies.3\n2. Photoinduced electron transfer leads to r
 adical ions or combined with proton transfer to radicals\, but the majorit
 y of chemical reactions proceeds via ionic intermediates. How can we gener
 ate reactive anions by light?4\n3. Metal complexes and organic dyes are wi
 dely used as molecular photocatalysts in synthesis\, but their stability a
 nd reuse can be problematic. Organic semiconductors are a valid alternativ
 e\, particular for applications at larger scale.5\nThe lecture discusses a
 pproaches from our laboratory to overcome these and other current and futu
 re challenges in chemical photocatalysis.\nReferences\n1. L. Marzo\, S. K.
  Pagire\, O. Reiser\, B. König\, Angew. Chem. Int. Ed. 2018\, 57\, 10034.
 \n2. D. Petzold\, M. Giedyk\, A. Chatterjee\, B. König\, Eur. J. Org. Che
 m. 2019\, 1193.\n3. I. Ghosh\, T. Ghosh\, J. I. Bardagi\, B. König\, Scie
 nce 2014\, 346\, 725. A. Chatterjee\, B. König\, Angew. Chem. Int. Ed. 20
 19\, 58\, 14289. M. Giedyk\, R. Narobe\, S. Weiß\, D. Touraud\, W. Kunz\,
  B. König\, Nat. Catal 2020\, 3\, 40. M. Schmalzbauer\, M. Marcon\, B. K
 önig\, Angew. Chem. Int. Ed. 2021\, 60\, 6270 – 6292.\n4. Q.-Y. Meng\, 
 T. E. Schirmer\, A. L. Berger\, K. Donabauer\, B. König\, J. Am. Chem. So
 c. 2019\, 141\, 11393 – 11397. S. Wang\, B.-Y. Cheng\, M. Sršen\, B. K
 önig\, J. Am. Chem. Soc. 2020\, 142\, 7524−7531. M. Schmalzbauer\, T. D
 . Svejstrup\, F. Fricke P. Brandt\, M. J. Johansson\, G. Bergonzini\, Burk
 hard König 2020\, 6\, 2658 - 2672. K. Donabauer\, B. König\, Acc. Chem. 
 Res. 2021\, 54\, 242–252. S. Wang\, B. König\, Angew. Chem. Int. Ed. 20
 21\, doi.org/10.1002/anie.202105469.\n5. I. Ghosh\, J. Khamrai\, A. Savate
 ev\, N. Shlapakov\, M. Antonietti\, B. König\, Science 2019\, 365\, 360. 
 J. Khamrai\, I. Ghosh\, A. Savateev\, M. Antonietti\, B. König\, ACS Cata
 lysis 2020\, 10\, 3526. J. Khamrai\, S. Das\, A. Savateev\, Markus Antonie
 tti\, B. König\, Green Chem. 2021\, 23\, 2017 – 2024.\n 
LOCATION:Auditoire CE1 https://plan.epfl.ch/?q=ce1&dim_floor=1&lang=fr&dim
 _lang=fr&tree_groups=centres_nevralgiques%2Cacces%2Cmobilite_reduite%2Cens
 eignement%2Ccommerces_et_services%2Cvehicules%2Cinfrastructure_plan_grp&tr
 e
STATUS:CONFIRMED
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