Zobrazeno 1 - 9 of 9 pro vyhledávání: '"Lukas Keweloh"'
1
Solid‐State Nuclear Magnetic Resonance Techniques for the Structural Characterization of Geminal Alane‐Phosphane Frustrated Lewis Pairs and Secondary Adducts
Autor: Hellmut Eckert, Damian Pleschka, Werner Uhl, Anna-Lena Wübker, Jonas Koppe, Michael Ryan Hansen, Lukas Keweloh, Henrik Bradtmüller
Publikováno v: Chemistry (Weinheim an Der Bergstrasse, Germany)
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
The first comprehensive solid‐state nuclear magnetic resonance (NMR) characterization of geminal alane‐phosphane frustrated Lewis pairs (Al/P FLPs) is reported. Their relevant NMR parameters (isotropic chemical shifts, direct and indirect 27Al‐
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b122165d8b07b9da8138e6a05c2941d
https://doi.org/10.1002/chem.202102113
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2
P–H Functionalized Al/P-Based Frustrated Lewis Pairs in Dipolar Activation and Hydrophosphination: Reactions with CO2 and SO2
Autor: Lukas Keweloh, Friedhelm Rogel, Werner Uhl, Alexander Hepp, Marcus Layh, Niklas Aders, Damian Pleschka
Publikováno v: Organometallics. 38:2839-2852
The P–H functionalized FLPs R(H)PC(AlBis2)═C(H)-CMe3 (1a, R = Bis; 1b, R = Mes; Bis = CH(SiMe3)2) combine the typical FLP properties based on Lewis acidic Al and basic P atoms with the reactivity of a P–H bond. They allow the coordination of su
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2bfe921037dff21ae62f894effa39cb
https://doi.org/10.1021/acs.organomet.9b00346
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3
3H‐Phosphaallenes Revisited: Facile Synthesis by Hydroalumination of Alkynylphosphines and β‐Elimination, Stability and Trapping of Transient Species by Coordination to Transition Metal Atoms
Autor: Jonas C. Tendyck, Werner Uhl, Hans Klöcker, Lukas Keweloh, Alexander Hepp
Publikováno v: Chemistry – A European Journal. 25:4793-4807
A facile method for the efficient synthesis of 3H-phosphaallenes, R-P=C=C(H)-R', is presented, which comprises treatment of dialkynylphosphines with dialkylaluminium hydrides (hydroalumination) and elimination of aluminium alkynides from intermediate
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa3fae5781573ed05d2e7bed623f8925
https://doi.org/10.1002/chem.201806334
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4
A P–H functionalized Al/P-based frustrated Lewis pair – hydrophosphination of nitriles, ring opening with cyclopropenones and evidence of PC double bond formation
Autor: Lukas Keweloh, Ernst-Ulrich Würthwein, Alexander Hepp, Werner Uhl, Damian Pleschka, Niklas Aders
Publikováno v: Dalton Transactions. 47:8402-8417
Hydroalumination of R-P(H)-CC-tBu with bulky H-Al[CH(SiMe3)2]2 afforded the new P–H functionalized Al/P-based frustrated Lewis pair R-P(H)-C[C(H)-tBu]-AlR2 [R = CH(SiMe3)2; FLP 7]. A weak adduct of 7 with benzonitrile (8) was detected by NMR spectr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::95c81fee278aeaad4193090ae76814da
https://doi.org/10.1039/c8dt01836g
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5
Reactivity of a P–H Functionalized Al/P‐Based Frustrated Lewis Pair – Hydrophosphination versus Classic Adduct Formation
Autor: Werner Uhl, Marcus Layh, Lukas Keweloh, Klaus Bergander, Frank Stegemann, Alexander Hepp
Publikováno v: Zeitschrift für anorganische und allgemeine Chemie. 643:1978-1990
The P-H functionalized Al/P-based frustrated Lewis pair (FLP) Mes(H)P-C[Al{CH(SiMe3)2}2]=C(H)-tBu (3) has the typical functionality of FLPs with Lewis acidic and basic centers in a single molecule and is able to transfer the P bound H atom to activat
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3551b3b148ad63148ddb9c8188799983
https://doi.org/10.1002/zaac.201700340
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6
Reactions of Al/P, Ga/P and P–H functionalized frustrated Lewis pairs with azides and a diazomethane – formation of adducts and capture of nitrenes
Autor: Josephine Possart, Werner Uhl, Marcus Layh, Agnes Wollschläger, Alexander Hepp, Lukas Keweloh, Damian Pleschka, Jana Backs
Publikováno v: Zeitschrift für Naturforschung B. 72:821-838
The Al- and Ga-based frustrated Lewis pairs (FLPs) Mes2P–C(MR2)=CH-R′ (1, M=Al, R= t Bu; 2, M=Al, R=CH2 t Bu; 3, M=Ga, R= t Bu) and the unique P–H functionalized FLP Mes(H)P–CH(AlR2)=C(H)- t Bu [4, R=CH(SiMe3)2] were treated with a variety of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::48dd5272ef7210d9f3a71cb23b0111db
https://doi.org/10.1515/znb-2017-0099
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8
A P−H Functionalized Al/P Frustrated Lewis Pair: Substrate Activation and Selective Hydrogen Transfer
Autor: Werner Uhl, Ernst-Ulrich Würthwein, Hans Klöcker, Lukas Keweloh
Publikováno v: Angewandte Chemie International Edition. 55:3212-3215
Hydroalumination of an alkynylphosphine gave an unprecedented P-H functionalized frustrated Lewis pair (FLP). The reactive P-H group does not influence the typical FLP properties, but the activation of substrates follows a new reaction pattern involv
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b580ea3aa859811df9f7ec1d1102b390
https://doi.org/10.1002/anie.201511048
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9
A P-H functionalized Al/P-based frustrated Lewis pair - hydrophosphination of nitriles, ring opening with cyclopropenones and evidence of P[double bond, length as m-dash]C double bond formation
Autor: Lukas, Keweloh, Niklas, Aders, Alexander, Hepp, Damian, Pleschka, Ernst-Ulrich, Würthwein, Werner, Uhl
Publikováno v: Dalton transactions (Cambridge, England : 2003). 47(25)
Hydroalumination of R-P(H)-C[triple bond, length as m-dash]C-tBu with bulky H-Al[CH(SiMe3)2]2 afforded the new P-H functionalized Al/P-based frustrated Lewis pair R-P(H)-C[[double bond, length as m-dash]C(H)-tBu]-AlR2 [R = CH(SiMe3)2; FLP 7]. A weak
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::0f9359548e1fa0216b9e46f2afee0378
https://pubmed.ncbi.nlm.nih.gov/29893387
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