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Kunchur HS, Balakrishna MS. Platinum Assisted Tandem P-C Bond Cleavage and P-N Bond Formation in Amide Functionalized Bisphosphine o-Ph 2PC 6H 4C(O)N(H)C 6H 4PPh 2- o: Synthesis, Mechanistic, and Catalytic Studies. Inorg Chem 2022; 61:857-868. [PMID: 34978187 DOI: 10.1021/acs.inorgchem.1c02515] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The reactions of amide functionalized bisphosphine o-Ph2PC6H4C(O)N(H)C6H4PPh2-o (1) with platinum salts are described. Treatment of 1 with [Pt(COD)Cl2] yielded a chelate complex, [PtCl2{o-Ph2PC6H4C(O)N(H)C6H4PPh2-o}κ2-P,P] (2), which on subsequent treatment with LiHMDS formed a novel 1,2-azaphospholene-phosphine complex [Pt(C6H5)Cl{o-C6H4{C(O)N(o-PPh2(C6H4))P(Ph)}}κ2-P,P] (3) involving a tandem P-C bond cleavage and P-N bond formation. The same complex 3 on passing dry HCl gas afforded the dichloro complex [PtCl2{o-C6H4{C(O)N(o-PPh2(C6H4))P(Ph)}}κ2-P,P] (5). Complex 2 upon refluxing in toluene or treatment of 1 with [Pt(COD)Cl2] in the presence of a base at room temperature resulted in the pincer complex [PtCl{o-Ph2PC6H4C(O)N(C6H4PPh2-o)}κ3-P,N,P] (4). Reaction of 1 with [Pt(COD)ClMe] at room temperature also afforded the pincer complex [PtMe{o-Ph2PC6H4C(O)N(C6H4PPh2-o)}κ3-P,N,P] (6). Mechanistic studies on 1,2-azaphospholene formation showed the reductive elimination of LiCl to form a phosphonium salt that readily adds one of the P-C bonds oxidatively to the in situ generated Pt0 species to form a chelate complex 3. The analogous palladium complex [PdCl2{o-C6H4{C(O)N(o-PPh2(C6H4))P(Ph)}}κ2-P,P] (7) showed excellent catalytic activity toward N-alkylation of amines with alcohols with a very low catalyst loading (0.05 mol %), and the methodology is very efficient toward the gram-scale synthesis of many N-alkylated amines.
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Affiliation(s)
- Harish S Kunchur
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Maravanji S Balakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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2
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González‐Montiel S, Ignacio Sandoval‐Chávez C, Castillo‐Moreno MÁ, Mendoza‐Espinosa D, Manuel Vásquez‐Pérez J, Cruz‐Borbolla J, Salazar‐Pereda V. Coordination from Heteroscorpionate Ligand Towards Pd(II) via Pd⋅⋅⋅Hδ−C(sp3) Interaction: Structural and Catalytic Studies. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Simplicio González‐Montiel
- Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C.P. 42184, Mineral de la Reforma Hidalgo México
| | - César Ignacio Sandoval‐Chávez
- CONACYT Research-Fellow, Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C. P. 42184, Mineral de la Reforma Hidalgo México
| | - Miguel Ángel Castillo‐Moreno
- Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C.P. 42184, Mineral de la Reforma Hidalgo México
| | - Daniel Mendoza‐Espinosa
- Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C.P. 42184, Mineral de la Reforma Hidalgo México
| | - José Manuel Vásquez‐Pérez
- CONACYT Research-Fellow, Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C. P. 42184, Mineral de la Reforma Hidalgo México
| | - Julián Cruz‐Borbolla
- Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C.P. 42184, Mineral de la Reforma Hidalgo México
| | - Verónica Salazar‐Pereda
- Área Académica de Química, Centro de Investigaciones Químicas Universidad Autónoma del Estado de Hidalgo km. 14.5 Carretera Pachuca-Tulancingo, Ciudad del Conocimiento C.P. 42184, Mineral de la Reforma Hidalgo México
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3
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Bhat SA, Sonawane SC, Mague JT, Balakrishna MS. Synthesis and characterization of Mo(0) and W(0) complexes of bis(azol-1-yl)methane based bisphosphines. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1955251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Sajad A. Bhat
- Department of Chemistry, Phosphorus Laboratory, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Sachin C. Sonawane
- Department of Chemistry, Phosphorus Laboratory, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Joel T. Mague
- Department of Chemistry, Tulane University, New Orleans, LA, USA
| | - Maravanji S. Balakrishna
- Department of Chemistry, Phosphorus Laboratory, Indian Institute of Technology Bombay, Powai, Mumbai, India
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Reiersølmoen AC, Battaglia S, Orthaber A, Lindh R, Erdélyi M, Fiksdahl A. P, N-Chelated Gold(III) Complexes: Structure and Reactivity. Inorg Chem 2021; 60:2847-2855. [PMID: 33169989 PMCID: PMC7927145 DOI: 10.1021/acs.inorgchem.0c02720] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Gold(III) complexes are versatile catalysts offering a growing number of new synthetic transformations. Our current understanding of the mechanism of homogeneous gold(III) catalysis is, however, limited, with that of phosphorus-containing complexes being hitherto underexplored. The ease of phosphorus oxidation by gold(III) has so far hindered the use of phosphorus ligands in the context of gold(III) catalysis. We present a method for the generation of P,N-chelated gold(III) complexes that circumvents ligand oxidation and offers full counterion control, avoiding the unwanted formation of AuCl4-. On the basis of NMR spectroscopic, X-ray crystallographic, and density functional theory analyses, we assess the mechanism of formation of the active catalyst and of gold(III)-mediated styrene cyclopropanation with propargyl ester and intramolecular alkoxycyclization of 1,6-enyne. P,N-chelated gold(III) complexes are demonstrated to be straightforward to generate and be catalytically active in synthetically useful transformations of complex molecules.
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Affiliation(s)
- Ann Christin Reiersølmoen
- Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway
| | - Stefano Battaglia
- Department of Chemistry-BMC Uppsala University, Husargatan 3, 75237 Uppsala, Sweden
| | - Andreas Orthaber
- Ångström Laboratory, Department of Organic Chemistry, Uppsala University, Lägerhyddsvägen 1, 75120 Uppsala, Sweden
| | - Roland Lindh
- Department of Chemistry-BMC Uppsala University, Husargatan 3, 75237 Uppsala, Sweden
| | - Máté Erdélyi
- Department of Chemistry-BMC Uppsala University, Husargatan 3, 75237 Uppsala, Sweden
| | - Anne Fiksdahl
- Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway
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5
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Kim S, Ryu H, Clegg JK, Lindoy LF, Lee SS. Exocyclic Coordination of Thiamacrocycles Leading to cis- and trans-Palladium(II) Complexes and a Tripalladium(II) Complex Incorporating Acetimidic Anhydride. Inorg Chem 2020; 59:15807-15812. [DOI: 10.1021/acs.inorgchem.0c02258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Seulgi Kim
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
| | - Hyunsoo Ryu
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Leonard F. Lindoy
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Shim Sung Lee
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
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6
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Rama RJ, Martín MT, Peloso R, Nicasio MC. Low-coordinate M(0) complexes of group 10 stabilized by phosphorus(III) ligands and N-heterocyclic carbenes. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2020.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Affiliation(s)
- Anthony P. Deziel
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Melissa R. Hoffbauer
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Vlad M. Iluc
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
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8
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Hoffbauer MR, Comanescu CC, Iluc VM. Reactivity of a Pd(II) carbene towards 2,6-dimesitylphenyldiazomethane and 2,6-dimesitylphenylazide. Polyhedron 2019. [DOI: 10.1016/j.poly.2018.11.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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Hoffbauer MR, Comanescu CC, Dymm BJ, Iluc VM. Influence of the Leaving Group on C–H Activation Pathways in Palladium Pincer Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00237] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Melissa R. Hoffbauer
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Cezar C. Comanescu
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Brittany J. Dymm
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Vlad M. Iluc
- Department of Chemistry and Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
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10
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Korenaga T, Kowata R, Kotaki T, Shibasaki Y, Oishi Y, Shimada K. Moderately Flexible Trans-Chelating Diphosphine Ligands Consisting of a Triazine Unit Showing High Ligand Acceleration Effect for Heck Reaction. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Toshinobu Korenaga
- Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551
| | - Ryo Kowata
- Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551
| | - Tomohiro Kotaki
- Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551
| | - Yuji Shibasaki
- Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551
| | - Yoshiyuki Oishi
- Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551
| | - Kazuaki Shimada
- Department of Chemistry and Biological Sciences, Faculty of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551
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11
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12
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Barrett BJ, Iluc VM. Metal-ligand cooperation between palladium and a diphosphine ligand with an olefinic backbone. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.08.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Barrett BJ, Iluc VM. An Adaptable Chelating Diphosphine Ligand for the Stabilization of Palladium and Platinum Carbenes. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00924] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Brittany J. Barrett
- Department of Chemistry and
Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Vlad M. Iluc
- Department of Chemistry and
Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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14
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Cui P, Hoffbauer MR, Vyushkova M, Iluc VM. Heterobimetallic Pd-K carbene complexes via one-electron reductions of palladium radical carbenes. Chem Sci 2016; 7:4444-4452. [PMID: 30155092 PMCID: PMC6014298 DOI: 10.1039/c6sc00948d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Accepted: 03/21/2016] [Indexed: 12/24/2022] Open
Abstract
Heterobimetallic Pd-K carbenes featuring Pd-Ccarbene-K moieties were synthesized via an unprecedented sequential substitution/reduction reaction from a radical precursor, [{PC˙(sp2)P} tBuPdI] ([PC(sp2)P] tBu = bis[2-(di-iso-propylphosphino)-4-tert-butylphenyl]methylene). Polymeric structures were observed in the solid state for the heterobimetallic compounds that can be interrupted in the presence of a donor solvent.
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Affiliation(s)
- Peng Cui
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
| | - Melissa R Hoffbauer
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
| | - Mariya Vyushkova
- Notre Dame Radiation Laboratory , University of Notre Dame , Notre Dame , IN 46556 , USA
| | - Vlad M Iluc
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
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15
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Kendall AJ, Zakharov LN, Tyler DR. Steric and Electronic Influences of Buchwald-Type Alkyl-JohnPhos Ligands. Inorg Chem 2016; 55:3079-90. [PMID: 26913633 DOI: 10.1021/acs.inorgchem.5b02996] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electron-donating and steric properties of Buchwald-type ligands ([1,1'-biphenyl-2-yl]dialkylphosphine; R-JohnPhos, where R = Me, Et, (i)Pr, Cy, (t)Bu) were determined. The π-acidity and σ-donating properties of the R-JohnPhos ligands were quantified using a Cotton-Kraihanzel analysis of the Cr(0)(CO)5(R-JohnPhos) complexes. Somewhat surprisingly, the σ-donating abilities of the R-JohnPhos ligands follow the trend (t)Bu-JohnPhos < Et-JohnPhos < (i)Pr-JohnPhos < Cy-JohnPhos ≪ Me-JohnPhos. This ordering is proposed to arise from competition between the intrinsic electron-donating ability of the R groups (Me < Et < (i)Pr ≈ Cy < (t)Bu) and steric interactions (front and back strain) that decrease the electron-donating ability of the phosphine. X-ray crystallographic data of 22 metal complexes (general forms: trans-Cr(0)(CO)4(PR3)2, Pd(0)(PR3)2(η(2)-dba), and trans-Pd(II)(Cl)2(PR3)2) were also analyzed to help explain the electronic trends measured for the R-JohnPhos ligands. The R-JohnPhos ligands are exceptionally sensitive to back strain in comparison to typical phosphines, and the strong σ-donating ability of the Methyl-JohnPhos ligand is attributed to its ability to avoid both front strain and back strain. Consequently, the -PMe2 moiety allows for very short phosphorus-metal bond distances. Because of the sterically dominating o-biphenyl and close phosphorus-metal bond distances, MeJPhos maintains a large overall steric profile that is actually larger than that of CyJPhos as measured by percent buried volume (%V(bur)). Overall, the -PMe2 moiety is a powerful way to incorporate strong σ-donation into "designer" phosphines while retaining other advantageous structural and reactivity properties.
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Affiliation(s)
- Alexander J Kendall
- University of Oregon , Department of Chemistry and Biochemistry, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Lev N Zakharov
- University of Oregon , Department of Chemistry and Biochemistry, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - David R Tyler
- University of Oregon , Department of Chemistry and Biochemistry, 1253 University of Oregon, Eugene, Oregon 97403, United States
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16
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Duan L, Fu R, Zhang B, Shi W, Chen S, Wan Y. An Efficient Reusable Mesoporous Solid-Based Pd Catalyst for Selective C2 Arylation of Indoles in Water. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02147] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Linlin Duan
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Rao Fu
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Bingsen Zhang
- Shenyang
National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
| | - Wen Shi
- Shenyang
National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
| | - Shangjun Chen
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Ying Wan
- Key
Laboratory of Resource Chemistry of Ministry of Education, Shanghai
Key Laboratory of Rare Earth Functional Materials, and Department
of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
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17
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Smith JD, Logan JR, Doyle LE, Burford RJ, Sugawara S, Ohnita C, Yamamoto Y, Piers WE, Spasyuk DM, Borau-Garcia J. Cationic mono and dicarbonyl pincer complexes of rhodium and iridium to assess the donor properties of PCcarbeneP ligands. Dalton Trans 2016; 45:12669-79. [DOI: 10.1039/c6dt02615j] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The donor properties of five different PCcarbeneP ligands are assessed by evaluation of the CO stretching frequencies in iridium(i) and rhodium(i) carbonyl cations.
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18
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Cui P, Iluc VM. Redox-induced umpolung of transition metal carbenes. Chem Sci 2015; 6:7343-7354. [PMID: 29142668 PMCID: PMC5633845 DOI: 10.1039/c5sc02859k] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 09/25/2015] [Indexed: 12/24/2022] Open
Abstract
Metal carbene complexes have been at the forefront of organic and organometallic synthesis and are instrumental in guiding future sustainable chemistry efforts. While classical Fischer and Schrock type carbenes have been intensely studied, compounds that do not fall within one of these categories have attracted attention only recently. In addition, applications of carbene complexes rarely take advantage of redox processes, which could open up a new dimension for their use in practical processes. Herein, we report an umpolung of a nucleophilic palladium carbene complex, [{PC(sp2)P} tBuPd(PMe3)] ({PC(sp2)P} tBu = bis[2-(di-iso-propylphosphino)-4-tert-butylphenyl]methylene), realized by successive one-electron oxidations that generated a cationic carbene complex, [{PC(sp2)P} tBuPdI]+, via a carbene radical, [{PC˙(sp2)P} tBuPdI]. An EPR spectroscopic study of [{PC˙(sp2)P} tBuPdI] indicated the presence of a ligand-centered radical, also supported by the results of reactions with 9,10-dihydroanthracene and PhSSPh. The cationic carbene complex shows electrophilic behavior toward nucleophiles such as NaH, p TolNHLi, PhONa, and PMe3, resulting from an inversion of the electronic character of the Pd-Ccarbene bond in [{PC(sp2)P} tBuPd(PMe3)]. The redox induced umpolung is reversible and unprecedented.
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Affiliation(s)
- Peng Cui
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
| | - Vlad M Iluc
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
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19
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Cowie BE, Emslie DJH. Nickel and Palladium Complexes of Ferrocene-Backbone Bisphosphine-Borane and Trisphosphine Ligands. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00539] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bradley E. Cowie
- Department of Chemistry and
Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - David J. H. Emslie
- Department of Chemistry and
Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
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20
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Comanescu CC, Vyushkova M, Iluc VM. Palladium carbene complexes as persistent radicals. Chem Sci 2015; 6:4570-4579. [PMID: 28717474 PMCID: PMC5500858 DOI: 10.1039/c5sc01441g] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 05/18/2015] [Indexed: 11/21/2022] Open
Abstract
A series of palladium(ii) radical carbene complexes, [PC˙(sp2)P]PdI, [PC˙(sp2)P]PdBr, and [PC˙(sp2)P]PdCl (PC(sp3)H2P = bis[2-(di-iso-propylphosphino)-phenyl]methane), is described. Compound [PC˙(sp2)P]PdI dimerizes to {[PC(sp2)P]PdI}2 in the solid state, akin to the formation of Gomberg's dimer. While the bromo and the iodo derivatives could be obtained from the oxidation of [PC(sp2)P]Pd(PMe3) by the respective dihalogens, a halogen transfer reaction from CH2Cl2 was used for the formation of [PC˙(sp2)P]PdCl. The halogen transfer from CH2X2 (X = Cl, Br, I) could be used to obtain all three radical carbene palladium complexes and also allowed the isolation of [PC(CH2)P]Pd(PMe3), which is the result of methylene group transfer from CH2X2. Compound [PC(CH2)P]Pd(PMe3) was independently synthesized from [PC(CH3)HP]PdCl2, which contains a supporting ligand analogous to that of the radical carbene complexes but has one of the hydrogen atoms replaced by a methyl group. All three carbene radical species abstract a hydrogen from 9,10-dihydroanthracene or n Bu3SnH.
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Affiliation(s)
- C C Comanescu
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
| | - M Vyushkova
- Notre Dame Radiation Laboratory , University of Notre Dame , Notre Dame , IN 46556 , USA
| | - V M Iluc
- Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame , IN 46556 , USA .
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21
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Affiliation(s)
- Cezar C. Comanescu
- Department
of Chemistry and
Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
| | - Vlad M. Iluc
- Department
of Chemistry and
Biochemistry, University of Notre Dame, 251 Nieuwland Science Hall, Notre Dame, Indiana 46556, United States
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22
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González-Montiel S, Baca-Téllez S, Martínez-Otero D. Construction of 18-membered monometallic macrocycles by a trans-spanning ligand. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.02.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Martínez-Espada N, Mena M, Pérez-Redondo A, Varela-Izquierdo V, Yélamos C. Heterometallic complexes with cube-type [MTi3N4] cores containing Group 10 metals in a variety of oxidation states. Dalton Trans 2015; 44:9782-94. [DOI: 10.1039/c5dt01200g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The metalloligand [{Ti(η5-C5Me5)(μ-NH)}3(μ3-N)] is capable of stabilizing Group 10 metals in the oxidation states 0,iioriv.
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Affiliation(s)
- Noelia Martínez-Espada
- Departamento de Química Orgánica y Química Inorgánica
- Universidad de Alcalá
- 28871 Alcalá de Henares
- Spain
| | - Miguel Mena
- Departamento de Química Orgánica y Química Inorgánica
- Universidad de Alcalá
- 28871 Alcalá de Henares
- Spain
| | - Adrián Pérez-Redondo
- Departamento de Química Orgánica y Química Inorgánica
- Universidad de Alcalá
- 28871 Alcalá de Henares
- Spain
| | - Víctor Varela-Izquierdo
- Departamento de Química Orgánica y Química Inorgánica
- Universidad de Alcalá
- 28871 Alcalá de Henares
- Spain
| | - Carlos Yélamos
- Departamento de Química Orgánica y Química Inorgánica
- Universidad de Alcalá
- 28871 Alcalá de Henares
- Spain
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Cui P, Comanescu CC, Iluc VM. Frustrated Lewis pair-like reactions of nucleophilic palladium carbenes with B(C6F5)3. Chem Commun (Camb) 2015; 51:6206-9. [DOI: 10.1039/c5cc00868a] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Nucleophilic palladium carbenes react with the strong Lewis acid B(C6F5)3via remote nucleophilic attack at the para-carbon of the supporting ligand or C–F activation of B(C6F5)3; these reactions indicate frustrated Lewis pair-like behaviour given the steric inaccessibility of the nucleophilic carbene center.
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Affiliation(s)
- Peng Cui
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Cezar C. Comanescu
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
| | - Vlad M. Iluc
- Department of Chemistry and Biochemistry
- University of Notre Dame
- Notre Dame
- USA
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Comanescu CC, Iluc VM. Synthesis and Reactivity of a Nucleophilic Palladium(II) Carbene. Organometallics 2014. [DOI: 10.1021/om500682s] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Cezar C. Comanescu
- Department
of Chemistry and
Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Vlad M. Iluc
- Department
of Chemistry and
Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
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26
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Comanescu CC, Oliver AG. Crystal structure of catena-poly[[potassium-tri-μ-di-methyl-acetamide-κ(6) O:O] iodide]. Acta Crystallogr Sect E Struct Rep Online 2014; 70:196-8. [PMID: 25484650 PMCID: PMC4257214 DOI: 10.1107/s1600536814020005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Accepted: 09/04/2014] [Indexed: 12/04/2022]
Abstract
A one-dimensional chain formed by potassium bridged by μ2-O-dimethylacetamide is reported. This represents a small class of dimethylacetamide complexes with oxygen bridging two metal centers. The structure of catena-poly[[potassium-tri-μ-dimethylacetamide-κ6O:O] iodide], {[K(C4H9NO)3]I}n, at 120 K has trigonal (P-3) symmetry. The structure adopts a linear chain motif parallel to the crystallographic c axis. Two crystallographically independent K+ cations are present in the asymmetric unit located on threefold rotoinversion axes at [0, 0, 0] and [0, 0, 1/2] and are bridged by the O atoms of the acetamide moiety. This is an example of a rare μ2-bridging mode for dimethylacetamide O atoms. The iodide counter-ion resides on a threefold rotation axis in the channel formed by the [K(C4H9NO)]+ chains.
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Affiliation(s)
- Cezar-Catalin Comanescu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA
| | - Allen G Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA
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