1
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Rej S, Chatani N. Regioselective Transition‐Metal‐Free C(sp
2
)−H Borylation: A Subject of Practical and Ongoing Interest in Synthetic Organic Chemistry. Angew Chem Int Ed Engl 2022; 61:e202209539. [DOI: 10.1002/anie.202209539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Indexed: 12/22/2022]
Affiliation(s)
- Supriya Rej
- Department of Applied Chemistry Faculty of Engineering and Research Center for Environmental Preservation Osaka University Suita, Osaka 565-0871 Japan
- Institut für Chemie Technische Universität Berlin Strasse des 17. Juni 115 10623 Berlin Germany
| | - Naoto Chatani
- Department of Applied Chemistry Faculty of Engineering and Research Center for Environmental Preservation Osaka University Suita, Osaka 565-0871 Japan
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2
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Rej S, Chatani N. Regio‐Selective Transition‐Metal‐Free C(sp2)‒H Borylation: A Subject of Practical and Ongoing Interest in Synthetic Organic Chemistry. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Supriya Rej
- Osaka University School of Engineering Graduate School of Engineering: Osaka Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Applied Chemistry JAPAN
| | - Naoto Chatani
- Osaka University School of Engineering Graduate School of Engineering: Osaka Daigaku Kogakubu Daigakuin Kogaku Kenkyuka Applied Chemistry 2-1 Yamadaoka 566-0871 Suita, Osaka JAPAN
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3
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Wu G, Xu X, Wang S, Chen L, Pang B, Ma T, Ji Y. Metal-free directed C−H borylation of 2-(N-methylanilino)-5-fluoropyridines and 2-benzyl-5-fluoropyridines. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.09.081] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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4
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Rej S, Das A, Chatani N. Pyrimidine-directed metal-free C-H borylation of 2-pyrimidylanilines: a useful process for tetra-coordinated triarylborane synthesis. Chem Sci 2021; 12:11447-11454. [PMID: 34567499 PMCID: PMC8409464 DOI: 10.1039/d1sc02937a] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 07/22/2021] [Indexed: 12/15/2022] Open
Abstract
Convenient, easily handled, laboratory friendly, robust approaches to afford synthetically important organoboron compounds are currently of great interest to researchers. Among the various available strategies, a metal-free approach would be overwhelmingly accepted, since the target boron compounds can be prepared in a metal-free state. We herein present a detailed study of the metal-free directed ortho-C–H borylation of 2-pyrimidylaniline derivatives. The approach allowed us to synthesize various boronates, which are synthetically important compounds and various four-coordinated triarylborane derivatives, which could be useful in materials science as well as Lewis-acid catalysts. This metal-free directed C–H borylation reaction proceeds smoothly without any interference by external impurities, such as inorganic salts, reactive functionalities, heterocycles and even transition metal precursors, which further enhance its importance. We present the metal-free ortho-C–H borylation of 2-pyrimidylanilines to afford synthetically important boronic esters and tetra-coordinated triarylboranes, which could be useful in materials science as well as Lewis-acid catalysts.![]()
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Affiliation(s)
- Supriya Rej
- Department of Applied Chemistry, Faculty of Engineering, Osaka University Suita Osaka 5650871 Japan
| | - Amrita Das
- Department of Applied Chemistry, Faculty of Engineering, Osaka University Suita Osaka 5650871 Japan
| | - Naoto Chatani
- Department of Applied Chemistry, Faculty of Engineering, Osaka University Suita Osaka 5650871 Japan
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5
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Tagne Kuate AC, Lalancette RA, Bockfeld D, Tamm M, Jäkle F. Palladium(0) complexes of diferrocenylmercury diphosphines: synthesis, X-ray structure analyses, catalytic isomerization, and C-Cl bond activation. Dalton Trans 2021; 50:4512-4518. [PMID: 33687041 DOI: 10.1039/d1dt00641j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Palladium(0) phosphine complexes are of great importance as catalysts in numerous bond formation reactions that involve oxidative addition of substrates. Highly active catalysts with labile ligands are of particular interest but can be challenging to isolate and structurally characterize. We investigate here the synthesis and chemical reactivity of Pd0 complexes that contain geometrically adaptable diferrocenylmercury-bridged diphosphine chelate ligands (L) in combination with a labile dibenzylideneacetone (dba) ligand. The diastereomeric diphosphines 1a (pSpR, meso-isomer) and 1b (pSpS-isomer) differ in the orientation of the ferrocene moieties relative to the central Ph2PC5H3-Hg-C5H3PPh2 bridging entity. The structurally distinct trigonal LPd0(dba) complexes 2a (meso) and 2b (pSpS) are obtained upon treatment with Pd(dba)2. A competition reaction reveals that 1b reacts faster than 1a with Pd(dba)2. Unexpectedly, catalytic interconversion of 1a (meso) into 1b (rac) is observed at room temperature in the presence of only catalytic amounts of Pd(dba)2. Both Pd0 complexes, 2a and 2b, readily undergo oxidative addition into the C-Cl bond of CH2Cl2 at moderate temperatures with formation of the square-planar trans-chelate complexes LPdIICl(CH2Cl) (3a, 3b). Kinetic studies reveal a significantly higher reaction rate for the meso-isomer 2a in comparison to (pSpS)-2b.
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Affiliation(s)
- Alain C Tagne Kuate
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA.
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6
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Haque A, Al-Balushi RA, Raithby PR, Khan MS. Recent Advances in π-Conjugated N^C-Chelate Organoboron Materials. Molecules 2020; 25:E2645. [PMID: 32517244 PMCID: PMC7321365 DOI: 10.3390/molecules25112645] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 06/03/2020] [Accepted: 06/04/2020] [Indexed: 11/17/2022] Open
Abstract
Boron-containing π-conjugated materials are archetypical candidates for a variety of molecular scale applications. The incorporation of boron into the π-conjugated frameworks significantly modifies the nature of the parent π-conjugated systems. Several novel boron-bridged π-conjugated materials with intriguing structural, photo-physical and electrochemical properties have been reported over the last few years. In this paper, we review the properties and multi-dimensional applications of the boron-bridged fused-ring π-conjugated systems. We critically highlight the properties of π-conjugated N^C-chelate organoboron materials. This is followed by a discussion on the potential applications of the new materials in opto-electronics (O-E) and other areas. Finally, attempts will be made to predict the future direction/outlook for this class of materials.
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Affiliation(s)
- Ashanul Haque
- Department of Chemistry, College of Science, University of Hail, Ha’il 81451, Saudi Arabia
| | - Rayya A. Al-Balushi
- Department of Basic Sciences, College of Applied and Health Sciences, A’Sharqiyah University, P.O. Box 42, Ibra 400, Sultanate of Oman;
| | - Paul R. Raithby
- Department of Chemistry, University of Bath, Claverton Down BA2 7AY, UK
| | - Muhammad S. Khan
- Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al-Khod 123, Sultanate of Oman
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7
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Iqbal SA, Pahl J, Yuan K, Ingleson MJ. Intramolecular (directed) electrophilic C-H borylation. Chem Soc Rev 2020; 49:4564-4591. [PMID: 32495755 DOI: 10.1039/c9cs00763f] [Citation(s) in RCA: 116] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
The intramolecular C-H borylation of (hetero)arenes and alkenes using electrophilic boranes is a powerful transition metal free methodology for forming C-B bonds. These C-H borylation reactions are preceded by intermolecular bond (both dative and covalent) formation, with examples proceeding via initial C-B and N-B bond formation dominating this field thus both are discussed in depth herein. Less prevalent intramolecular electrophilic C-H borylation reactions that proceed by intermolecular O-B, S-B and P-B bond formation are also summarised. Mechanistic studies are presented that reveal two mechanisms for C-H borylation, (i) electrophilic aromatic substitution (prevalent with B-X electrophiles); (ii) σ-bond metathesis mediated (prevalent with B-H and B-R electrophiles). To date, intramolecular electrophilic C-H borylation is utilised mainly for accessing boron containing conjugated organic materials, however recent developments, summarized herein alongside early studies, have highlighted the applicability of this methodology for forming synthetically versatile organo-boronate esters and boron containing bioactives. The multitude of synthetic procedures reported for intramolecular electrophilic C-H borylation contain many common features and this enables key requirements for successful C-H borylation and the factors effecting regioselectivity and substrate scope to be identified, discussed and summarized.
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Affiliation(s)
- S A Iqbal
- EastCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
| | - J Pahl
- EastCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
| | - K Yuan
- EastCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
| | - M J Ingleson
- EastCHEM School of Chemistry, University of Edinburgh, Edinburgh, EH9 3FJ, UK.
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8
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Tagne Kuate AC, Lalancette RA, Bannenberg T, Tamm M, Jäkle F. Diferrocenylmercury diphosphine diastereomers with unique geometries: trans-chelation at Pd(ii) with short Hg(ii)Pd(ii) contacts. Dalton Trans 2019; 48:13430-13439. [PMID: 31441475 DOI: 10.1039/c9dt02728a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diphosphine chelate ligands are essential in many catalytic processes with both the electronic structure and bite angle having a dramatic influence on the coordination behavior and catalytic performance. The synthesis of a new class of diferrocenylmercury-supported diphosphine chelate ligands was accomplished by the reaction of (ortho-diphenylphosphino)ferrocenyl sulfinate (2) with t-BuLi, followed by treatment with mercury(ii) chloride. Two diastereomers, 4a (pSpR-, meso-isomer) and 4b (pSpS-isomer), differ in the orientation of the ferrocene moiety relative to the central Ph2PC5H3-Hg-C5H3PPh2 bridging entity. They were isolated independently and fully characterized in solution and in the solid state by single crystal X-ray diffraction analysis. Key characteristics of these ligands are their exceptionally wide and flexible bite angles and the unique stereochemical environment that is achieved upon coordination to transition metals. Complexation to Pd(ii)Cl2 gives rise to unusual square-planar trans-chelate complexes 5a (meso) and 5b (pSpS). In competition reactions, 4a and 4b show similar reactivity toward Pd(ii)Cl2. The molecular structures of 5a and 5b exhibit short PdHg contacts, possibly indicating secondary metallophilic interactions as further evidenced by bond-critical points between Pd and Hg that were identified by AIM analyses.
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Affiliation(s)
- Alain C Tagne Kuate
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA. and Department of Chemistry, Faculty of Sciences, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Roger A Lalancette
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA.
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, NJ 07102, USA.
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9
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Tagne Kuate AC, Lalancette RA, Jäkle F. Mechanistic Studies into the Sn/Hg Exchange Reaction of 1,2-Fc(PPh2)(SnMe3) with HgCl2: Competitive Sn–Me over Sn–Fc Cleavage in Noncoordinating Solvents. Organometallics 2019. [DOI: 10.1021/acs.organomet.8b00862] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
- Department of Chemistry, Faculty of Sciences, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Roger A. Lalancette
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University—Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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10
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Stolar M, Baumgartner T. Functional conjugated pyridines via main-group element tuning. Chem Commun (Camb) 2018. [DOI: 10.1039/c8cc00373d] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The functional properties arising from a combination of main-group elements with pyridine-based organic conjugated scaffolds are highlighted.
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11
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Tagne Kuate AC, Lalancette RA, Jäkle F. Planar-chiral ferrocenylphosphine-borane complexes featuring agostic-type B–H⋯E (E = Hg, Sn) interactions. Dalton Trans 2017; 46:6253-6264. [DOI: 10.1039/c6dt04791b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ferrocenylphosphine-borane adducts with Lewis acidic organotin and organomercury substituents inortho-position show rare agostic-type B–H⋯E (E = Sn, Hg) interactions that have been studied by single crystal XRD, multinuclear solution NMR, and computational methods.
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Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
- Department of Chemistry
| | | | - F. Jäkle
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
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12
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Lerayer E, Renaut P, Roger J, Pirio N, Cattey H, Devillers CH, Lucas D, Hierso JC. A general diastereoselective synthesis of highly functionalized ferrocenyl ambiphiles enabled on a large scale by electrochemical purification. Chem Commun (Camb) 2017; 53:6017-6020. [DOI: 10.1039/c7cc02469j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A diastereoselective modification of tert-butylated ferrocenes leads to highly functionalized constrained ambiphiles (P,B or N,B) and hybrids (P,N or P,P′) on a multigram scale by a smart electrochemical purification.
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Affiliation(s)
- Emmanuel Lerayer
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Patrice Renaut
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Julien Roger
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Nadine Pirio
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Hélène Cattey
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Charles H. Devillers
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Dominique Lucas
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
| | - Jean-Cyrille Hierso
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB)
- Université de Bourgogne Franche-Comté (UMR 6302)
- 21078 Dijon
- France
- Institut Universitaire de France (IUF)
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13
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Yuan K, Wang X, Mellerup SK, Wyman I, Schatte G, Ding Z, Wang S. Triarylborane-Supported Polyferrocenyl Systems: Impact of the Linking Unit on Electronic and Electrochemical Properties. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00574] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kang Yuan
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Xiang Wang
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Soren K. Mellerup
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Ian Wyman
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Gabriele Schatte
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
| | - Zhifeng Ding
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Suning Wang
- Department of Chemistry, Queen’s University, Kingston, Ontario K7L 3N6, Canada
- Beijing Key Laboratory of Photoelectronic/Electrophotonic
Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
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14
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Crossley DL, Vitorica-Yrezabal I, Humphries MJ, Turner ML, Ingleson MJ. Highly Emissive Far Red/Near-IR Fluorophores Based on Borylated Fluorene-Benzothiadiazole Donor-Acceptor Materials. Chemistry 2016; 22:12439-48. [PMID: 27460768 PMCID: PMC6680280 DOI: 10.1002/chem.201602010] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Indexed: 01/25/2023]
Abstract
Stille, Suzuki-Miyaura and Negishi cross-coupling reactions of bromine-functionalised borylated precursors enable the facile, high yielding, synthesis of borylated donor-acceptor materials that contain electron-rich aromatic units and/or extended effective conjugation lengths. These materials have large Stokes shifts, low LUMO energies, small band-gaps and significant fluorescence emission >700 nm in solution and when dispersed in a host polymer.
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Affiliation(s)
- Daniel L Crossley
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
| | | | - Martin J Humphries
- Cambridge Display Technology Ltd. (Company Number 02672530) Unit 12, Cardinal Park, Cardinal Way, Godmanchester, PE29 2XG, UK
| | - Michael L Turner
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK.
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15
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Chen J, Tagne Kuate AC, Lalancette RA, Jäkle F. Heteroatom-Bridged ortho-Biferrocenes: Stereoselective Synthesis, Structural Features, and Electrochemical Properties. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00272] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiawei Chen
- Department
of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Alain C. Tagne Kuate
- Department
of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
- Department
of Chemistry, Faculty of Sciences, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Roger A. Lalancette
- Department
of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Frieder Jäkle
- Department
of Chemistry, Rutgers University-Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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16
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Yusuf M, Liu K, Guo F, Lalancette RA, Jäkle F. Luminescent organoboron ladder compounds via directed electrophilic aromatic C–H borylation. Dalton Trans 2016; 45:4580-7. [DOI: 10.1039/c5dt05077d] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Regioselective electrophilic borylation of a pyridyl-flanked fluorene provides highly luminescent, air-stable boron-bridged ladder species.
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Affiliation(s)
- Mayyadah Yusuf
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | - Kanglei Liu
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | - Fang Guo
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
| | | | - Frieder Jäkle
- Department of Chemistry
- Rutgers University-Newark
- Newark
- USA
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17
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Crossley DL, Cid J, Curless LD, Turner ML, Ingleson MJ. Facile Arylation of Four-Coordinate Boron Halides by Borenium Cation Mediated Boro-desilylation and -destannylation. Organometallics 2015; 34:5767-5774. [PMID: 27064894 PMCID: PMC4819459 DOI: 10.1021/acs.organomet.5b00857] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Indexed: 11/28/2022]
Abstract
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The addition of AlCl3 to four-coordinate boranes of
the general formula (C–N-chelate)BCl2 results in
halide abstraction and formation of three-coordinate borenium cations
of the general formula [(C–N-chelate)BCl]+. The
latter react with both arylstannanes and arylsilanes by boro-destannylation
and -desilylation, respectively, to form arylated boranes. Catalytic
quantities of AlCl3 were sufficient to effect high-yielding
arylation of (C–N-chelate)BCl2. Boro-destannylation
is more rapid than boro-desilylation and leads to double arylation
at the boron center, whereas in reactions with arylsilanes either
single or double arylation occurs dependent on the nucleophilicity
of the arylsilane and on the electrophilicity of the borenium cation.
The electrophilicity of the borenium cation derived from 2-phenylpyridine
was greater than that of the benzothiadiazole analogues, enabling
the boro-desilyation of less nucleophilic silanes and the direct electrophilic
borylation of 2-methylthiophene.
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Affiliation(s)
- Daniel L Crossley
- School of Chemistry, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Jessica Cid
- School of Chemistry, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Liam D Curless
- School of Chemistry, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Michael L Turner
- School of Chemistry, University of Manchester , Manchester M13 9PL, United Kingdom
| | - Michael J Ingleson
- School of Chemistry, University of Manchester , Manchester M13 9PL, United Kingdom
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18
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Chen J, Chen EYX. Unsolvated Al(C6F5)3: structural features and electronic interaction with ferrocene. Dalton Trans 2015; 45:6105-10. [PMID: 26567780 DOI: 10.1039/c5dt03895b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alkyl/aryl ligand exchange between AlEt3 and B(C6F5)3 in hexanes enables the formation and isolation of the unsolvated Al(C6F5)3 as a crystalline solid, the structure of which has been determined by single-crystal X-ray diffraction analysis. Instead of forming the anticipated AlF contacts with the seemingly more accessible meta- and para-F's of -C6F5 groups, two Al(C6F5)3 molecules form a dimeric structure with double AlF interactions between the Al center of one molecule and the ortho-F atom of the -C6F5 group on the other molecule. This mode of interactions is apparently linked to the thermal and shock sensitivity of the unsolvated Al(C6F5)3 in the solid state. To compare with the B(C6F5)3/ferrocene frustrated Lewis pair system, the complexation between Al(C6F5)3 and ferrocene has also been studied, which affords a stable adduct formed through the η(1)-coordination of Al to one of the CCp atoms, similar to the alane-toluene or benzene complex.
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Affiliation(s)
- Jiawei Chen
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA.
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19
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Podolan G, Hettmanczyk L, Hommes P, Sarkar B, Reissig HU. Synthesis and (Spectro)electrochemistry of Ferrocenyl-Substituted Pyridine Derivatives. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501163] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Crossley DL, Cade IA, Clark ER, Escande A, Humphries MJ, King SM, Vitorica-Yrezabal I, Ingleson MJ, Turner ML. Enhancing electron affinity and tuning band gap in donor-acceptor organic semiconductors by benzothiadiazole directed C-H borylation. Chem Sci 2015; 6:5144-5151. [PMID: 29142733 PMCID: PMC5666683 DOI: 10.1039/c5sc01800e] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 06/06/2015] [Indexed: 12/22/2022] Open
Abstract
Electrophilic borylation using BCl3 and benzothiadiazole to direct the C-H functionalisation of an adjacent aromatic unit produces fused boracyclic materials with minimally changed HOMO energy levels but significantly reduced LUMO energy levels. In situ alkylation and arylation at boron using Al(alkyl)3 or Zn(aryl)2 is facile and affords boracycles that possess excellent stability towards protic solvents, including water, and display large bathochromic shifts leading to far red/NIR emission in the solid state with quantum yields of up to 34%. Solution fabricated OLEDs with far red/NIR electroluminescence are reported with EQEs > 0.4%.
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Affiliation(s)
- D L Crossley
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
| | - I A Cade
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
| | - E R Clark
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
| | - A Escande
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
| | - M J Humphries
- Cambridge Display Technology Limited , Unit 3, Cardinal Park, Cardinal Way , Godmanchester , PE29 2XG , UK
| | - S M King
- Cambridge Display Technology Limited , Unit 3, Cardinal Park, Cardinal Way , Godmanchester , PE29 2XG , UK
| | - I Vitorica-Yrezabal
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
| | - M J Ingleson
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
| | - M L Turner
- School of Chemistry , University of Manchester , Manchester , M13 9PL , UK . ;
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21
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Chen J, Murillo Parra DA, Lalancette RA, Jäkle F. Redox-Switchable Chiral Anions and Cations Based on Heteroatom-Fused Biferrocenes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00577] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiawei Chen
- Department of Chemistry, Rutgers University-Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
| | - Didier A. Murillo Parra
- Department of Chemistry, Rutgers University-Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
| | - Roger A. Lalancette
- Department of Chemistry, Rutgers University-Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University-Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
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22
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Chen J, Murillo Parra DA, Lalancette RA, Jäkle F. Diferrocenophosphaborin: A Planar-Chiral, Redox-Active and Anion-Responsive Ambiphilic Ligand. Angew Chem Int Ed Engl 2015; 54:10202-5. [DOI: 10.1002/anie.201504922] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Indexed: 11/11/2022]
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23
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Chen J, Murillo Parra DA, Lalancette RA, Jäkle F. Diferrocenophosphaborin: A Planar-Chiral, Redox-Active and Anion-Responsive Ambiphilic Ligand. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504922] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Swamy P CA, Thilagar P. Polyfunctional Lewis Acids: Intriguing Solid-State Structure and Selective Detection and Discrimination of Nitroaromatic Explosives. Chemistry 2015; 21:8874-82. [DOI: 10.1002/chem.201500727] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Indexed: 12/13/2022]
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25
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Braunschweig H, Ewing WC, Ferkinghoff K, Hermann A, Kramer T, Shang R, Siedler E, Werner C. Activation of boryl-, borylene and metalloborylene complexes by isonitriles. Chem Commun (Camb) 2015; 51:13032-5. [DOI: 10.1039/c5cc04712a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
One or several isonitriles can insert into metalloboryl and metalloborylene complexes to afford cyclic or spiro compounds with bonding controlled by the electron count at the metal and in the ring.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - William C. Ewing
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Katharina Ferkinghoff
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Alexander Hermann
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Thomas Kramer
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Rong Shang
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Eva Siedler
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Christine Werner
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
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26
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Chen J, Lalancette RA, Jäkle F. Chiral Organoborane Lewis Pairs Derived from Pyridylferrocene. Chemistry 2014; 20:9120-9. [DOI: 10.1002/chem.201400057] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 04/08/2014] [Indexed: 11/12/2022]
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27
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Leusmann E, Wagner M, Rosemann NW, Chatterjee S, Dehnen S. Synthesis, crystal structure, and photoluminescence studies of a ruthenocenyl-decorated Sn/S cluster. Inorg Chem 2014; 53:4228-33. [PMID: 24716534 DOI: 10.1021/ic500367y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Recently, we reported on ferrocenyl-decorated Sn/S clusters; herein, we present the extension of our investigations by attachment of ruthenocenyl units to an according cluster skeleton. The latter was realized upon improvement of the synthesis of acetylruthenocene, its conversion to a hydrazone derivative, and the subsequent reaction with a keto-functionalized Sn/S precursor complex. The report comprises the crystal structures of acetylruthenocene and the ruthenocenyl-terminated Sn/S cluster [(R(Rc)Sn)4Sn2S10] (R(Rc) = CMe2CH2C(Me)═N-N═C(Me)Rc), as well as the discussion of the electrochemical properties of the latter and its behavior during time-resolved photoluminescence investigations.
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Affiliation(s)
- Eliza Leusmann
- Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften, Philipps-Universität Marburg , Hans-Meerwein-Str., D-35043 Marburg, Germany
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28
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Braunschweig H, Geetharani K, Jimenez-Halla JOC, Schäfer M. Direkte Synthese von funktionalisierten 1,2-Azaborininen. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309707] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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29
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Braunschweig H, Geetharani K, Jimenez-Halla JOC, Schäfer M. Direct Synthetic Route to Functionalized 1,2-Azaborinines. Angew Chem Int Ed Engl 2014; 53:3500-4. [DOI: 10.1002/anie.201309707] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 01/09/2014] [Indexed: 11/06/2022]
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30
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Hejda M, Lyčka A, Jambor R, Růžička A, Dostál L. From C,N- and N,N-chelated chloroboranes to substituted 1H-2,1-benzazaboroles and 1H-pyrrolo[1,2-c][1,3,2]diazaborolidines: a straightforward route to five-membered rings containing the B–N or N–B–N moiety. Dalton Trans 2014; 43:12678-88. [DOI: 10.1039/c4dt01445f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of C,N- and N,N-chelated boranes with lithium reagents resulted in the formation of substituted 1H-2,1-benzazaboroles and 1H-pyrrolo[1,2-c][1,3,2]diazaborolidines.
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Affiliation(s)
- Martin Hejda
- Department of General and Inorganic Chemistry
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice, Czech Republic
| | - Antonín Lyčka
- Research Institute for Organic Syntheses
- Pardubice, Czech Republic
| | - Roman Jambor
- Department of General and Inorganic Chemistry
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice, Czech Republic
| | - Libor Dostál
- Department of General and Inorganic Chemistry
- Faculty of Chemical Technology
- University of Pardubice
- Pardubice, Czech Republic
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