Search Results - "Fröhlich, Roland"

Oxidative Heck Arylation for the Stereoselective Synthesis of Tetrasubstituted Olefins Using Nitroxides as Oxidants by He, Zhiheng, Kirchberg, Sylvia, Fröhlich, Roland, Studer, Armido

“…One, two, and three! Nitroxides and dioxygen serve as oxidants in highly stereoselective oxidative Pd‐catalyzed Heck arylations in which aryl boronic acids are…”
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Deep-Blue-Emitting Heteroleptic Iridium(III) Complexes Suited for Highly Efficient Phosphorescent OLEDs by Yang, Cheng-Han, Mauro, Matteo, Polo, Federico, Watanabe, Soichi, Muenster, Ingo, Fröhlich, Roland, De Cola, Luisa

“…We report on the design, synthesis, and characterization of four new heteroleptic iridium(III) complexes bearing 2′,6′-difluoro-2,3′-bipyridine and…”
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Highly Asymmetric NHC-Catalyzed Hydroacylation of Unactivated Alkenes by Piel, Isabel, Steinmetz, Marc, Hirano, Keiichi, Fröhlich, Roland, Grimme, Stefan, Glorius, Frank

“…NHC‐catalysis proto(n)type: The title reaction produces 21 different chroman‐4‐one‐type products in good yields and excellent enantioselectivities, in each…”
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Carbon−Carbon Bond Activation by 1,1-Carboboration of Internal Alkynes by Chen, Chao, Kehr, Gerald, Fröhlich, Roland, Erker, Gerhard

“…Internal alkynes undergo 1,1-carboboration reactions upon treatment with boranes RB(C6F5)2 (R = C6F5, CH3) to yield trisubstituted alkenylboranes. These…”
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Enantioselective Haloetherification by Asymmetric Opening of meso-Halonium Ions by Hennecke, Ulrich, Müller, Christian H, Fröhlich, Roland

“…A new approach to enantioselective haloetherification reactions via desymmetrization of in situ-generated meso-halonium ions is described. The combination of…”
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IBiox[(−)-menthyl]: A Sterically Demanding Chiral NHC Ligand by Würtz, Sebastian, Lohre, Claudia, Fröhlich, Roland, Bergander, Klaus, Glorius, Frank

“…An exceedingly sterically demanding, rigid, and chiral NHC ligand, IBiox[(−)-menthyl] (1), was prepared and structurally characterized. With a buried volume of…”
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Designing N-Heterocyclic Carbenes: Simultaneous Enhancement of Reactivity and Enantioselectivity in the Asymmetric Hydroacylation of Cyclopropenes by Liu, Fan, Bugaut, Xavier, Schedler, Michael, Fröhlich, Roland, Glorius, Frank

“…Faster, higher, stronger! The N‐heterocyclic carbene (NHC) catalyzed diastereo‐ and enantioselective hydroacylation of cyclopropenes affords structurally…”
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Highly Stereoselective Synthesis of 1,2,3-Trisubstituted Indanes via Oxidative N-Heterocyclic Carbene-Catalyzed Cascades by Biswas, Anup, De Sarkar, Suman, Fröhlich, Roland, Studer, Armido

“…Three stereocenters are formed in the carbene catalyzed cascade reaction of enals with various β-diketones to give the corresponding indane derivatives with…”
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An Axially Chiral, Electron-Deficient Borane: Synthesis, Coordination Chemistry, Lewis Acidity, and Reactivity by Mewald, Marius, Fröhlich, Roland, Oestreich, Martin

“…An axially chiral dihydroborepine with a binaphthyl backbone and a C6F5 substituent at the boron atom was prepared by transmetalation from the corresponding…”
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1,1-Carboboration of 1-Alkynes: A Conceptual Alternative to the Hydroboration Reaction by Chen, Chao, Voss, Tanja, Fröhlich, Roland, Kehr, Gerald, Erker, Gerhard

“…Strongly electrophilic boranes R-B(C6F5)2 react readily with a variety of 1-alkynes by means of a 1,1-carboboration reaction to yield alkenylborane products,…”
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Metal-Free Catalytic Hydrogenation of Enamines, Imines, and Conjugated Phosphinoalkenylboranes by Spies, Patrick, Schwendemann, Sina, Lange, Stefanie, Kehr, Gerald, Fröhlich, Roland, Erker, Gerhard

“…The metal‐free hydrogen activator 1 catalyzes the unique P/B hydrogenation of the frustrated Lewis pair 3, which itself is inactive toward H2 under the applied…”
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Iridium Metal Complexes Containing N-Heterocyclic Carbene Ligands for Blue-Light-Emitting Electrochemical Cells by Yang, Cheng-Han, Beltran, Juan, Lemaur, Vincent, Cornil, Jérôme, Hartmann, David, Sarfert, Wiebke, Fröhlich, Roland, Bizzarri, Claudia, De Cola, Luisa

“…A new series of cationic blue-emitting, heteroleptic iridium(III)-based metal complexes were systematically synthesized using two 4,6-difluorophenylpyridine…”
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Catalytic Asymmetric Domino Michael-Henry Reaction: Enantioselective Access to Bicycles with Consecutive Quaternary Centers by Using Bifunctional Catalysts by Rueping, Magnus, Kuenkel, Alexander, Fröhlich, Roland

“…Domino catalysis: Two consecutive quaternary stereocenters, three functional groups, and four stereogenic centers have been created in the newly developed…”
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Electronic Control of Frustrated Lewis Pair Behavior: Chemistry of a Geminal Alkylidene-Bridged Per-pentafluorophenylated P/B Pair by Rosorius, Christoph, Kehr, Gerald, Fröhlich, Roland, Grimme, Stefan, Erker, Gerhard

“…“Markovnikov” hydroboration of bis(pentafluorophenyl)(propynyl)phosphine (12) with Piers' borane [HB(C6F5)2] gives the frustrated Lewis pair (FLP)…”
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Reaction of Frustrated Lewis Pairs with Conjugated Ynones-Selective Hydrogenation of the Carbon-Carbon Triple Bond by Xu, Bao-Hua, Kehr, Gerald, Fröhlich, Roland, Wibbeling, Birgit, Schirmer, Birgitta, Grimme, Stefan, Erker, Gerhard

“…Frustrated, but not frustrating: Frustrated Lewis pairs (FLPs) can undergo selective 1,4‐addition reactions with conjugated ynones (see scheme). Upon FLP…”
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Mild Metal-Free Tandem [alpha]-Alkylation/Cyclization of N-Benzyl Carbamates with Simple Olefins by Richter, Heinrich, Frohlich, Roland, Daniliuc, Constantin-Gabriel, GarciaMancheno, Olga

“…Easy does it! The chemoselective oxidative α-C(sp(3))-H alkylation/cyclization reaction of N-benzyl carbamates using simple mono-, di-, and trisubstituted…”
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P−C Bond Activation Chemistry: Evidence for 1,1-Carboboration Reactions Proceeding with Phosphorus−Carbon Bond Cleavage by Ekkert, Olga, Kehr, Gerald, Fröhlich, Roland, Erker, Gerhard

“…A series of diarylphosphinyl-substituted acetylenes of the type (aryl)2P−CC−R (aryl = phenyl or mesityl, R = Ph or n-propyl) react with the strongly Lewis…”
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Control of the Mutual Arrangement of Cyclometalated Ligands in Cationic Iridium(III) Complexes. Synthesis, Spectroscopy, and Electroluminescence of the Different Isomers by Fernández-Hernández, Jesús M, Yang, Cheng-Han, Beltrán, Juan I, Lemaur, Vincent, Polo, Federico, Fröhlich, Roland, Cornil, Jêrôme, De Cola, Luisa

“…Synthetic control of the mutual arrangement of the cyclometalated ligands (C^N) in Ir(III) dimers, [Ir(C^N)2Cl]2, and cationic bis-cyclometalated Ir(III)…”
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CO2 and Formate Complexes of Phosphine/Borane Frustrated Lewis Pairs by Peuser, Ilona, Neu, Rebecca C., Zhao, Xiaoxi, Ulrich, Matthias, Schirmer, Birgitta, Tannert, Jens A., Kehr, Gerald, Fröhlich, Roland, Grimme, Stefan, Erker, Gerhard, Stephan, Douglas W.

“…The reaction of a solution of B(C6F4H)3 and either iPr3P or tBu3P with CO2 afforded the species R3P(CO2)B(C6F4H)3 (R=iPr (1), tBu (2)). In a similar fashion…”
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Activation of the Si−B Linkage: Copper-Catalyzed Addition of Nucleophilic Silicon to Imines by Vyas, Devendra J, Fröhlich, Roland, Oestreich, Martin

“…Activation of the Si−B bond through copper-catalyzed transmetalation quickly developed into a practical method to generate Cu−Si reagents. These silicon…”
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