Zobrazeno 1 - 10 of 13 pro vyhledávání: '"Kevin M, Szkop"'
1
A Primary Acyl Phosphine Stabilized by a Phosphonium Ylide
Autor: Piers St. Onge, Zheng-Wang Qu, Stefan Grimme, Douglas W. Stephan, David A. Petrone, Linkun Miao, Kevin M. Szkop
Publikováno v: Angewandte Chemie International Edition. 60:18547-18551
Primary acyl-phosphines are scarce in the literature. Here we show that the reaction of Ph3 GePCO with the ylide Ph3 PCH2 proceeds to give the species Ph3 PCHC(O)PH(GePh3 ) 1. Deprotonation of 1 with Na[N(SiMe3 )2 ] generates the salt [Na(THF)2 ][Ph3
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29959a2d6aa5286e1f1b2d160b8a5c8c
https://doi.org/10.1002/anie.202106846
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2
Avenue to phosphaalkenes from Ph3GePCO
Autor: Hlib Razumkov, Andrew R. Jupp, Kevin M. Szkop, Douglas W. Stephan
Publikováno v: Dalton Transactions. 49:885-890
Reactions of Ph3GePCO with KP(t-Bu)2 and Ph3SiCl, or direct reaction with Ph3SiP(t-Bu)2 provides the (Z)- and (E)-isomers of the phosphaalkene (t-Bu2)PC(OSiPh3)P(GePh3) 2, respectively. These isomers interconvert thermally and photochemically, while
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::431cc0a1e229a68c50c3ff19cfcdfab1
https://doi.org/10.1039/c9dt04590b
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3
Diphospha‐Ureas from the Phosphaketene Ph 3 GePCO
Autor: Douglas W. Stephan, Hlib Razumkov, Andrew R. Jupp, Maotong Xu, Kevin M. Szkop
Publikováno v: Chemistry – A European Journal. 25:10084-10087
The phosphaketene Ph3 GePCO is shown to react with the phosphide KP(tBu)2 to generate the anion [Ph3 GePC(O)P(tBu)2 ]- 1. This species reacts with CH3 I or ClGePh3 to give the dissymmetric diphospha-ureas (tBu)2 PC(O)P(GePh3 )(CH3 ) 2 and (Ph3 Ge)2 P
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fcdea53119680b17000bb57b520e7136
https://doi.org/10.1002/chem.201902789
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4
Synthesis of acyl(chloro)phosphines enabled by phosphinidene transfer
Autor: Kevin M. Szkop, Douglas W. Stephan, Michael B. Geeson, Christopher C. Cummins
Publikováno v: Chemical Science
Acyl(chloro)phosphines RC(O)P(Cl)(t-Bu) have been prepared by formal insertion of tert-butyl phosphinidene (t-Bu–P) from t-BuPA (A = C14H10 or anthracene) into the C–Cl bond of acyl chlorides.
Acyl(chloro)phosphines RC(O)P(Cl)(t-Bu) have bee
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::702f8315780a47d66a795dbd8171efa4
https://doi.org/10.1039/c8sc05657a
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5
Probing steric influences on electrophilic phosphonium cations: a comparison of [(3,5-(CF3)2C6H3)3PF]+ and [(C6F5)3PF]+
Autor: Farah E. Farinha, Douglas W. Stephan, Shawn Postle, James H. W. LaFortune, Kevin M. Szkop, Timothy C. Johnstone
Publikováno v: Dalton Transactions. 47:11411-11419
The electrophilic phosphonium cation (EPC) salt [(3,5-(CF3)2C6H3)3PF][B(C6F5)4] (2) is prepared via oxidation of the precursor phosphine with XeF2 and subsequent abstraction of fluoride with [Et3Si(tol)][B(C6F5)4]. The Lewis acidity of 2 is evaluated
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b00426fcf57184e586bfcb8bf10b2a8d
https://doi.org/10.1039/c8dt02594k
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6
Interception of intermediates in phosphine oxidation by mesityl nitrile-N-oxide using frustrated Lewis pairs
Autor: Kevin M. Szkop, Douglas W. Stephan, Julian Heck, Lauren E. Longobardi, Diya Zhu
Publikováno v: Dalton Transactions. 47:8933-8939
Phosphine oxidation by MesCNO is rapid; however, an FLP strategy intercepts the 1,3 addition products including [MesC(R3P)NOB(C6F5)3] (R = Ph 1, p-tol 2), [MesC(Mes2PH)NOB(C6F5)3] 3 (MesC(NOB(C6F5)3)Ph2P)2(CH2)n (n = 2: 4, 3: 5) and [MesC(Ph3P)NOB(C6
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::48707c61443d1f480543ffee274f8f9e
https://doi.org/10.1039/c8dt01717d
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7
Borane-Stabilized Isomeric Dimers of the Phosphaethynolate Anion
Autor: Andrew R. Jupp, Kevin M. Szkop, Douglas W. Stephan, Hansjörg Grützmacher, Riccardo Suter
Publikováno v: Angewandte Chemie International Edition. 56:14174-14177
The reactions of the phosphaethynolate anion ([PCO]- ) with a range of boranes were explored. BPh3 and [PCO]- form a dimeric anion featuring P-B bonds and is prone to dissociation at room temperature. The more Lewis acidic borane B(C6 F5 )3 yields a
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1f49d13f1d4c066df43fe44850549eb
https://doi.org/10.1002/anie.201708646
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8
Metal-free pincer ligand chemistry polycationic phosphonium Lewis acids
Autor: Kevin M. Szkop, Douglas W. Stephan
Publikováno v: Dalton Transactions. 46:3921-3928
Oxidation of 2,6-bis(diphenylphosphine)methyl pyridine with MeO3SCF3, yields the dication [2,6-(CH2PMePh2)2C5H3N][CF3SO3]22, while subsequent treatment with two equivalents of [K(THF)n][B(C6F5)4] (n = 1.3–1.5) afforded [2,6-(CH2PMePh2)2C5H3N][B(C6F
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::acf88f241641cd54393247016c5cd514
https://doi.org/10.1039/c7dt00441a
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10
Oxygen trapping and cation site-splitting in Y(2−x)PrxO3+δ (0.0≤x<2.0 and δ≤1.0)
Autor: Kevin M. Szkop, Joey A. Lussier, Graham Devitt, Mario Bieringer
Publikováno v: Journal of Solid State Chemistry. 242:126-132
The reduction and oxidation of the solid solution Y2−xPrxO3+δ (0.0≤x ( I a 3 ¯ ) . The oxidized solid solution Y2−xPrxO3+δ (0.0≤x ( I a 3 ¯ ) whereas Y2−xPrxO3+δ (1.4≤x ( F m 3 ¯ m ) with variable oxide defect concentrations. The tw
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::269b4f48a90cd92b9d1d53e5df1d083a
https://doi.org/10.1016/j.jssc.2016.03.017
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