1
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Xu H, Lv ZJ, Wei J, Xi Z. N-aryloxide-amidinate group 4 metal complexes. Dalton Trans 2023; 52:11565-11570. [PMID: 37545467 DOI: 10.1039/d3dt01767b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
A N-aryloxide-amidine ligand (H3L), integrating phenoxide (PhO-) and amidine ligands through methylene linkers, has been synthesized from 2-(aminomethyl)-6-(tert-butyl)phenol in two steps. Upon reacting the deprotonated H3L ligand with group 4 metal chloride MIVCl4, a corresponding (LMIV-Cl)2 dimer could be obtained. The coordination modes exhibit variation depending on the radius of the metal ions. In the case of (LTiIV-Cl)2, the two ArO- arms from the same ligand bond to two different Ti(IV) centers, while in the case of (LZrIV/HfIV-Cl)2, both ArO- arms coordinate with the same metal center. Moreover, the two C-N bonds in the amidinate moiety are localized in (LTiIV-Cl)2, whereas they delocalize in (LZrIV-Cl)2. Notably, (LHfIV-Cl)2 could further react with one equivalent of HfCl4, yielding the binuclear metal azide in the presence of KN3 and LiCl, where the coordination mode of the amidinate moiety changed from the bidentate chelating type to the bimetallic bridging coordination.
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Affiliation(s)
- Hanhua Xu
- Beijing National Laboratory for Molecular Sciences (BNLMS), MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing, China.
| | - Ze-Jie Lv
- Beijing National Laboratory for Molecular Sciences (BNLMS), MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing, China.
| | - Junnian Wei
- Beijing National Laboratory for Molecular Sciences (BNLMS), MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing, China.
| | - Zhenfeng Xi
- Beijing National Laboratory for Molecular Sciences (BNLMS), MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing, China.
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2
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P. M M, S N, Kulkarni NV, Jagirdar BR, Jones WD. Guerbet upgrading of ethanol to n-butanol using Ru( iii) catalysts under air. NEW J CHEM 2023. [DOI: 10.1039/d3nj00535f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
A series of in situ prepared Ru(iii) complexes supported by easily accessible N-donor organic pincer ligands were used as catalysts in the Guerbet upgrading reaction of ethanol under aerobic conditions.
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Affiliation(s)
- Mahitha P. M
- Department of Chemistry, Amrita Vishwa Vidyapeetham, Amritapuri 690525, Kerala, India
| | - Nakul S
- Department of Chemistry, Amrita Vishwa Vidyapeetham, Amritapuri 690525, Kerala, India
| | - Naveen V. Kulkarni
- Department of Chemistry, Amrita Vishwa Vidyapeetham, Amritapuri 690525, Kerala, India
| | - Balaji R. Jagirdar
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, Karnataka, India
| | - William D. Jones
- Department of Chemistry, University of Rochester, Rochester, New York 14450, USA
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3
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2-(Arylimino)benzylidene-8-arylimino-5,6,7-trihydroquinoline Cobalt(II) Dichloride Polymerization Catalysts for Polyethylenes with Narrow Polydispersity. Catalysts 2022. [DOI: 10.3390/catal12101119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of 2-(arylimino)benzylidene-8-arylimino-5,6,7-trihydroquinoline cobalt(II) chlorides (Co1–Co6) containing a fused ring and a more inert phenyl group as the substituent at the imino-C atom has been synthesized using a one-pot synthesis method and fully characterized by FT-IR and elemental analysis. The molecular structures of Co2 and Co5 have been confirmed by X-ray diffraction as having a distorted square pyramidal geometry around a cobalt core with a tridentate N,N,N-chelating ligand and two chlorides. On activation with either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), Co1–Co6 exhibited high activities for ethylene polymerization. The least sterically hindered Co2 showed a maximum activity of 16.51 × 106 g (PE) mol−1 (Co) h−1 at a moderate temperature 50 °C. Additionally, ortho-fluoride Co6 was able to maintain a high activity not only at 70 °C but also after 60 min at 50 °C, highlighting its excellent thermal-stability and long catalytic lifetime. The resultant polyethylene showed clearly narrower molecular weight distribution (PDI: 1.3–3.1) than those produced by structurally related cobalt counterparts, indicating the positive influence of benzhydryl substitution on the catalysis. Moreover, the molecular weight (1.7–386.6 kg mol−1) of vinyl- or n-propyl-terminated polyethylene can be finely regulated by controlling polymerization parameters.
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4
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LLDPE-like Polymers Accessible via Ethylene Homopolymerization Using Nitro-Appended 2-(Arylimino)pyridine-nickel Catalysts. Catalysts 2022. [DOI: 10.3390/catal12090961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Four examples of para-nitro substituted 2-(arylimino)pyridine-nickel(II) bromide complexes of general formula, [2-{(2,6-R-4-NO2C6H2)N=CMe}C5H4N]NiBr2, but differentiable by the steric/electronic properties displayed by the ortho-groups [R = i-Pr (Ni1), Et (Ni2), CHPh2 (Ni3), CH(4-FPh)2 (Ni4)], have been prepared in good yield. For comparative purposes, the meta-nitro complex, [2-{(2,6-i-Pr2-3-NO2-4-(4-FPh)2C6H)N=CMe}C5H4N]NiBr2 (Ni5), has also been synthesized. The molecular structures of mononuclear Ni3·xH2O (x = 2, 3) and bromide-bridged dinuclear Ni4 and Ni5 are disclosed. Upon activation with either ethylaluminum dichloride (EtAlCl2) or modified methylaluminoxane (MMAO), all precatalysts displayed good catalytic performance at operating temperatures between 30 °C and 60 °C with higher activities generally seen using EtAlCl2 [up to 4.7 × 106 g PE (mol of Ni)−1 h−1]: Ni2 ~ Ni5 > Ni1 ~ Ni4 > Ni3. In terms of the resultant polyethylene (PE), Ni4/EtAlCl2 formed the highest molecular weight of the series (Mw up to 1.4 × 105 g mol−1) with dispersities (Mw/Mn) ranging from narrow to broad (Mw/Mn range: 2.2–24.4). Moreover, the melting temperatures (Tm) of the polymers generated via EtAlCl2 activation fell in a narrow range, 117.8–126.0 °C, which resembles that seen for industrial-grade linear-low density polyethylene (LLDPE). Indeed, their 13C NMR spectra revealed significant amounts of uniformly distributed long-chain branches (LCBs), while internal vinylene groups constituted the major type of chain unsaturation [vinylene:vinyl = 5.3:1 (EtAlCl2) and 9.9:1 (MMAO)].
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5
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Robinson TP, Georges M, Turner ZR, Buffet JC, O’Hare D. Zirconium Permethylpentalene Amidinate Complexes: Characterization, Bonding, and Olefin Polymerization Catalysis. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas P. Robinson
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Maureen Georges
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Zoë R. Turner
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Jean-Charles Buffet
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Dermot O’Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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6
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DiPucchio RC, Rosca SC, Schafer LL. Hydroaminoalkylation for the Catalytic Addition of Amines to Alkenes or Alkynes: Diverse Mechanisms Enable Diverse Substrate Scope. J Am Chem Soc 2022; 144:11459-11481. [PMID: 35731810 DOI: 10.1021/jacs.1c10397] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Hydroaminoalkylation is a powerful, atom-economic catalytic reaction for the reaction of amines with alkenes and alkynes. This C-H functionalization reaction allows for the atom-economic alkylation of amines using simple alkenes or alkynes as the alkylating agents. This transformation has significant potential for transformative approaches in the pharmaceutical, agrochemical, and fine chemical industries in the preparation of selectively substituted amines and N-heterocycles and shows promise in materials science for the synthesis of functional and responsive aminated materials. Different early transition-metal, late transition-metal, and photoredox catalysts mediate hydroaminoalkylation by distinct mechanistic pathways. These mechanistic insights have resulted in the development of new catalysts and reaction conditions to realize hydroaminoalkylation with a broad range of substrates: activated and unactivated, terminal and internal, C-C double and triple bonds with aryl or alkyl primary, secondary, or tertiary amines, including N-heterocyclic amines. By deploying select catalysts with specific substrate combinations, control over regioselectivity, diastereoselectivity, and enantioselectivity has been realized. Key barriers to widespread adoption of this reaction include air and moisture sensitivity for early transition-metal catalysts as well as a heavy dependence on amine protecting or directing groups for late transition-metal or photocatalytic routes. Advances in improved catalyst robustness, substrate scope, and regio-/stereoselective reactions with early- and late transition-metal catalysts, as well as photoredox catalysis, are highlighted, and opportunities for further catalyst and reaction development are included. This perspective shows that hydroaminoalkylation has the potential to be a disruptive and transformative strategy for the synthesis of selectively substituted amines and N-heterocycles from simple amines and alkenes.
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Affiliation(s)
- Rebecca C DiPucchio
- Department of Chemistry, The University of British Columbia, Vancouver, BC, Canada, V6T 1Z1
| | - Sorin-Claudiu Rosca
- Department of Chemistry, The University of British Columbia, Vancouver, BC, Canada, V6T 1Z1
| | - Laurel L Schafer
- Department of Chemistry, The University of British Columbia, Vancouver, BC, Canada, V6T 1Z1
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7
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Kaper T, Geik D, Fornfeist F, Schmidtmann M, Doye S. Stereoselective Synthesis of Tertiary Allylic Amines by Titanium-Catalyzed Hydroaminoalkylation of Alkynes with Tertiary Amines. Chemistry 2021; 28:e202103931. [PMID: 34936144 PMCID: PMC9303398 DOI: 10.1002/chem.202103931] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Indexed: 12/01/2022]
Abstract
Intermolecular hydroaminoalkylation reactions of symmetrical and unsymmetrical alkynes with tertiary amines take place in the presence of catalytic amounts of TiBn4, Ph3C[B(C6F5)4], and a sterically demanding aminopyridinato ligand precursor. The resulting products, synthetically and pharmaceutically useful tertiary β,γ‐disubstituted allylic amines, are formed in convincing yields and with excellent stereoselectivity. Particularly promising for future applications is the fact that even the industrial side product trimethylamine can be used as a substrate.
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Affiliation(s)
- Tobias Kaper
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Dennis Geik
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Felix Fornfeist
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Marc Schmidtmann
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Sven Doye
- Universitaet Oldenburg, Institut fuer Chemie, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, GERMANY
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8
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Manßen M, Deng D, Zheng CHM, DiPucchio RC, Chen D, Schafer LL. Ureate Titanium Catalysts for Hydroaminoalkylation: Using Ligand Design to Increase Reactivity and Utility. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00014] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Manfred Manßen
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Danfeng Deng
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Cameron H. M. Zheng
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Rebecca C. DiPucchio
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Dafa Chen
- Shenzhen Grubbs Institute, Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, People’s Republic of China
| | - Laurel L. Schafer
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
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9
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Coles NT, Gasperini D, Provis-Evans CB, Mahon MF, Webster RL. Heterobimetallic Complexes of 1,1-Diphosphineamide Ligands. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Nathan T. Coles
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Danila Gasperini
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Cei B. Provis-Evans
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Ruth L. Webster
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
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10
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Lamb JR, Brown CM, Johnson JA. N-Heterocyclic carbene-carbodiimide (NHC-CDI) betaine adducts: synthesis, characterization, properties, and applications. Chem Sci 2021; 12:2699-2715. [PMID: 34164037 PMCID: PMC8179359 DOI: 10.1039/d0sc06465c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 01/18/2021] [Indexed: 11/21/2022] Open
Abstract
N-Heterocyclic carbenes (NHCs) are an important class of reactive organic molecules used as ligands, organocatalysts, and σ-donors in a variety of electroneutral ylide or betaine adducts with main-group compounds. An emerging class of betaine adducts made from the reaction of NHCs with carbodiimides (CDIs) form zwitterionic amidinate-like structures with tunable properties based on the highly modular NHC and CDI scaffolds. The adduct stability is controlled by the substituents on the CDI nitrogens, while the NHC substituents greatly affect the configuration of the adduct in the solid state. This Perspective is intended as a primer to these adducts, touching on their history, synthesis, characterization, and general properties. Despite the infancy of the field, NHC-CDI adducts have been applied as amidinate-type ligands for transition metals and nanoparticles, as junctions in zwitterionic polymers, and to stabilize distonic radical cations. These applications and potential future directions are discussed.
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Affiliation(s)
- Jessica R Lamb
- Department of Chemistry, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
| | - Christopher M Brown
- Department of Chemistry, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
| | - Jeremiah A Johnson
- Department of Chemistry, Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 USA
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11
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Zamisa SJ, Bongoza U, Omondi B. Predicting molecular isomerism of symmetrical and unsymmetrical N, N′-diphenyl formamidines in the solid-state: crystal structure, Hirshfeld surface analysis, pairwise interaction energy, and Δ Hfusion and Δ Sfusion correlations. CrystEngComm 2021. [DOI: 10.1039/d1ce00458a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Correlating molecular isomerism of N,N′-diphenylformamidine derivatives in the solid state with molecular pairwise interaction energies, experimental enthalpy and entropy of fusion.
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Affiliation(s)
- Sizwe J. Zamisa
- School of Chemistry and Physics
- University of Kwazulu-Natal
- Durban 4000
- South Africa
| | - Unathi Bongoza
- School of Chemistry and Physics
- University of Kwazulu-Natal
- Durban 4000
- South Africa
| | - Bernard Omondi
- School of Chemistry and Physics
- University of Kwazulu-Natal
- Pietermaritzburg
- South Africa
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12
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Warsitz M, Doye S. Linear Hydroaminoalkylation Products from Alkyl-Substituted Alkenes. Chemistry 2020; 26:15121-15125. [PMID: 32643801 PMCID: PMC7756280 DOI: 10.1002/chem.202003223] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Indexed: 12/17/2022]
Abstract
The regioselective conversion of alkyl-substituted alkenes into linear hydroaminoalkylation products represents a strongly desirable synthetic transformation. In particular, such conversions of N-methylamine derivatives are of great scientific interest, because they would give direct access to important amines with unbranched alkyl chains. Herein, we present a new one-pot procedure that includes an initial alkene hydroaminoalkylation with an α-silylated amine substrate and a subsequent protodesilylation reaction that delivers linear hydroaminoalkylation products with high selectivity from simple alkyl-substituted alkenes. For that purpose, new titanium catalysts have been developed, which are able to activate the α-C-H bond of more challenging α-silylated amine substrates. In addition, a direct relationship between the ligand structure of the new catalysts and the obtained regioselectivity is described.
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Affiliation(s)
- Michael Warsitz
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Strasse 9–1126129OldenburgGermany
| | - Sven Doye
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Strasse 9–1126129OldenburgGermany
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13
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Khononov M, Liu H, Fridman N, Tamm M, Eisen MS. Benzimidazolin-2-iminato Hafnium Complexes: Synthesis, Characterization, and Catalytic Addition of Alcohols to Carbodiimides. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00384] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Maxim Khononov
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Heng Liu
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Moris S. Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City 32000, Israel
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14
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Bielefeld J, Doye S. Fast Titanium-Catalyzed Hydroaminomethylation of Alkenes and the Formal Conversion of Methylamine. Angew Chem Int Ed Engl 2020; 59:6138-6143. [PMID: 31994302 PMCID: PMC7187458 DOI: 10.1002/anie.202001111] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Indexed: 12/17/2022]
Abstract
The scientific interest in catalytic hydroaminoalkylation reactions of alkenes has vastly increased over the past decade, but these reactions have struggled to become a viable option for general laboratory or industrial use because of reaction times of several days. The titanium-based catalytic system introduced in this work not only reduces the reaction time by several orders of magnitude, into the range of minutes, but the catalyst is also demonstrated to be easily available from common starting materials, at a cost of approximately 1 € per millimole of catalyst. We were also able to formally perform C-H activation of methylamine and achieve coupling to a broad variety of alkenes, through silyl protection of the amine and simple deprotection by water.
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Affiliation(s)
- Jens Bielefeld
- Universität OldenburgInstitut für ChemieCarl-von-Ossietzky-Strasse 9–1126129OldenburgGermany
| | - Sven Doye
- Universität OldenburgInstitut für ChemieCarl-von-Ossietzky-Strasse 9–1126129OldenburgGermany
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15
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Bielefeld J, Doye S. Fast Titanium‐Catalyzed Hydroaminomethylation of Alkenes and the Formal Conversion of Methylamine. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001111] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jens Bielefeld
- Universität OldenburgInstitut für Chemie Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
| | - Sven Doye
- Universität OldenburgInstitut für Chemie Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
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16
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Khononov M, Fridman N, Tamm M, Eisen MS. Hydroboration of Aldehydes, Ketones, and Carbodiimides Promoted by Mono(imidazolin‐2‐iminato) Hafnium Complexes. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901750] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Maxim Khononov
- Schulich Faculty of Chemistry TechnionIsrael Institute of Technology 32000 Haifa City Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry TechnionIsrael Institute of Technology 32000 Haifa City Israel
| | - Matthias Tamm
- Institut fürAnorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Moris S. Eisen
- Schulich Faculty of Chemistry TechnionIsrael Institute of Technology 32000 Haifa City Israel
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17
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Manßen M, Schafer LL. Titanium catalysis for the synthesis of fine chemicals – development and trends. Chem Soc Rev 2020; 49:6947-6994. [DOI: 10.1039/d0cs00229a] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Atlas as a Titan(ium) is holding the earth-abundant chemistry world. Titanium is the second most abundant transition metal, is a key player in important industrial processes (e.g. polyethylene) and shows much promise for diverse applications in the future.
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Affiliation(s)
- Manfred Manßen
- The Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| | - Laurel L. Schafer
- The Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
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18
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Bielefeld J, Kurochkina E, Schmidtmann M, Doye S. New Titanium Complexes and Their Use in Hydroamination and Hydroaminoalkylation Reactions. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900586] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jens Bielefeld
- Institut für Chemie Universität Oldenburg Carl‐von‐Ossietzky‐Straße 9‐11 26129 Oldenburg Germany
| | - Ekaterina Kurochkina
- Institut für Chemie Universität Oldenburg Carl‐von‐Ossietzky‐Straße 9‐11 26129 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Universität Oldenburg Carl‐von‐Ossietzky‐Straße 9‐11 26129 Oldenburg Germany
| | - Sven Doye
- Institut für Chemie Universität Oldenburg Carl‐von‐Ossietzky‐Straße 9‐11 26129 Oldenburg Germany
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19
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Kaper T, Doye S. Hydroaminoalkylation/Buchwald-Hartwig amination sequences for the synthesis of benzo-annulated seven-membered nitrogen heterocycles. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Brunner TS, Roesky PW. Enantiopure amidinate complexes of lutetium. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.03.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Bielefeld J, Doye S. Dimethylamin als Substrat in Hydroaminoalkylierungsreaktionen. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708959] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jens Bielefeld
- Universität Oldenburg; Institut für Chemie; Carl-von-Ossietzky-Straße 9-11 26129 Oldenburg Deutschland
| | - Sven Doye
- Universität Oldenburg; Institut für Chemie; Carl-von-Ossietzky-Straße 9-11 26129 Oldenburg Deutschland
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22
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Bielefeld J, Doye S. Dimethylamine as a Substrate in Hydroaminoalkylation Reactions. Angew Chem Int Ed Engl 2017; 56:15155-15158. [PMID: 28994176 DOI: 10.1002/anie.201708959] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 09/27/2017] [Indexed: 11/08/2022]
Abstract
Transition-metal-catalyzed hydroaminoalkylations of alkenes have made great progress over the last decade and are heading to become a viable alternative to the industrial synthesis of amines through hydroformylation of alkenes and subsequent reductive amination. In the past, one major obstacle of this progress has been an inability to apply these reactions to the most important amines, methylamine and dimethylamine. Herein, we report the first successful use of dimethylamine in catalytic hydroaminoalkylations of alkenes with good yields. We also report applicability for a variety of alkenes to show the tolerance of the reaction towards different functional groups. Additionally, we present a catalytic dihydroaminoalkylation reaction using dimethylamine, which has never been reported before.
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Affiliation(s)
- Jens Bielefeld
- Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Sven Doye
- Universität Oldenburg, Institut für Chemie, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
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23
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Tolpygin AO, Luconi L, Shavyrin AS, Tuci G, Cherkasov AV, Rossin A, Fukin GK, Giambastiani G, Trifonov AA. (Amido)‐ and (Chlorido)titanium and ‐zirconium Complexes Coordinated by
ansa
‐Bis(amidinate) Ligands with a Rigid
o
‐Phenylene Linker. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700497] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Aleksei O. Tolpygin
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina 49, GSP‐445 630950 Nizhny Novgorod Russia
| | - Lapo Luconi
- Institute of Chemistry of OrganoMetallic Compounds ICCOM‐CNR Via Madonna del Piano 10 50019 Sesto Fiorentino, Florence Italy
| | - Andrei S. Shavyrin
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina 49, GSP‐445 630950 Nizhny Novgorod Russia
| | - Giulia Tuci
- Institute of Chemistry of OrganoMetallic Compounds ICCOM‐CNR Via Madonna del Piano 10 50019 Sesto Fiorentino, Florence Italy
| | - Anton V. Cherkasov
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina 49, GSP‐445 630950 Nizhny Novgorod Russia
| | - Andrea Rossin
- Institute of Chemistry of OrganoMetallic Compounds ICCOM‐CNR Via Madonna del Piano 10 50019 Sesto Fiorentino, Florence Italy
| | - Georgy K. Fukin
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina 49, GSP‐445 630950 Nizhny Novgorod Russia
| | - Giuliano Giambastiani
- Institute of Chemistry of OrganoMetallic Compounds ICCOM‐CNR Via Madonna del Piano 10 50019 Sesto Fiorentino, Florence Italy
- Kazan Federal University 420008 Kazan Russian Federation
| | - Alexander A. Trifonov
- Institute of Organometallic Chemistry of Russian Academy of Sciences Tropinina 49, GSP‐445 630950 Nizhny Novgorod Russia
- Institute of Organoelement Compounds of Russian Academy of Sciences Vavilova str. 28 119334 Moscow Russia
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24
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See XY, Beaumier EP, Davis-Gilbert ZW, Dunn PL, Larsen JA, Pearce AJ, Wheeler TA, Tonks IA. Generation of Ti II Alkyne Trimerization Catalysts in the Absence of Strong Metal Reductants. Organometallics 2017; 36:1383-1390. [PMID: 28690352 DOI: 10.1021/acs.organomet.7b00096] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Low-valent TiII species have typically been synthesized by the reaction of TiIV halides with strong metal reductants. Herein we report that TiII species can be generated simply by reacting TiIV imido complexes with 2 equiv of alkyne, yielding a metallacycle that can reductively eliminate pyrrole while liberating TiII. In order to probe the generality of this process, TiII-catalyzed alkyne trimerization reactions were carried out with a diverse range of TiIV precatalysts.
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Affiliation(s)
- Xin Yi See
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Evan P Beaumier
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Zachary W Davis-Gilbert
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Peter L Dunn
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Jacob A Larsen
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Adam J Pearce
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - T Alex Wheeler
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Ian A Tonks
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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25
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Lühning LH, Strehl J, Schmidtmann M, Doye S. Hydroaminoalkylation of Allylsilanes and a One-Pot Procedure for the Synthesis of 1,5-Benzoazasilepines. Chemistry 2017; 23:4197-4202. [PMID: 28124797 DOI: 10.1002/chem.201605923] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 01/26/2017] [Indexed: 11/11/2022]
Abstract
Allylsilanes undergo highly regioselective intermolecular alkene hydroaminoalkylation with secondary amines in the presence of a titanium mono(formamidinate) catalyst. Corresponding reactions of a suitable allyl(2-bromophenyl)silane which exclusively deliver the branched hydroaminoalkylation products combined with a subsequent Buchwald-Hartwig amination result in the development of an elegant one-pot procedure for the synthesis of literature-unknown silicon analogues of 1,5-benzodiazepines, the so-called 1,5-benzoazasilepines.
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Affiliation(s)
- Lars H Lühning
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26111, Oldenburg, Germany
| | - Julia Strehl
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26111, Oldenburg, Germany
| | - Marc Schmidtmann
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26111, Oldenburg, Germany
| | - Sven Doye
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26111, Oldenburg, Germany
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26
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Bayram M, Naglav D, Wölper C, Schulz S. Syntheses and Structures of Homo- and Heteroleptic Beryllium Complexes Containing N,N′-Chelating Ligands. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00865] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Melike Bayram
- Institute of Inorganic Chemistry
and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45117 Essen, Germany
| | - Dominik Naglav
- Institute of Inorganic Chemistry
and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45117 Essen, Germany
| | - Christoph Wölper
- Institute of Inorganic Chemistry
and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45117 Essen, Germany
| | - Stephan Schulz
- Institute of Inorganic Chemistry
and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45117 Essen, Germany
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27
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Weers M, Lühning LH, Lührs V, Brahms C, Doye S. One-Pot Procedure for the Synthesis of 1,5-Benzodiazepines fromN-Allyl-2-bromoanilines. Chemistry 2016; 23:1237-1240. [DOI: 10.1002/chem.201604561] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Marco Weers
- Institut für Chemie; Universität Oldenburg; Carl-von-Ossietzky-Straße 9-11 26111 Oldenburg Germany
| | - Lars H. Lühning
- Institut für Chemie; Universität Oldenburg; Carl-von-Ossietzky-Straße 9-11 26111 Oldenburg Germany
| | - Vanessa Lührs
- Institut für Chemie; Universität Oldenburg; Carl-von-Ossietzky-Straße 9-11 26111 Oldenburg Germany
| | - Christian Brahms
- Institut für Chemie; Universität Oldenburg; Carl-von-Ossietzky-Straße 9-11 26111 Oldenburg Germany
| | - Sven Doye
- Institut für Chemie; Universität Oldenburg; Carl-von-Ossietzky-Straße 9-11 26111 Oldenburg Germany
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28
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Akpan ED, Ojwach SO, Omondi B, Nyamori VO. Structural and kinetic studies of the ring-opening polymerization of cyclic esters using N,N′ diarylformamidines Zn(II) complexes. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Ji X, Yao W, Luo X, Gao W, Mu Y. Synthesis of Ti, Zr, and Hf complexes with a new tetra-azane ligand by one-pot HCl-elimination and their properties as catalysts for production of UHMWPE. NEW J CHEM 2016. [DOI: 10.1039/c5nj02151k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first example for the HCl-elimination reaction being applied in the attachment of an amido-containing ligand to Zr and Hf.
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Affiliation(s)
- Xiangdong Ji
- State Key Laboratory of Supramolecular Structure and Materials
- School of Chemistry
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Wei Yao
- State Key Laboratory of Supramolecular Structure and Materials
- School of Chemistry
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Xuyang Luo
- State Key Laboratory of Supramolecular Structure and Materials
- School of Chemistry
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Wei Gao
- State Key Laboratory of Supramolecular Structure and Materials
- School of Chemistry
- Jilin University
- Changchun 130012
- People's Republic of China
| | - Ying Mu
- State Key Laboratory of Supramolecular Structure and Materials
- School of Chemistry
- Jilin University
- Changchun 130012
- People's Republic of China
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30
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Akpan ED, Ojwach SO, Omondi B, Nyamori VO. Zn(ii) and Cu(ii) formamidine complexes: structural, kinetics and polymer tacticity studies in the ring-opening polymerization of ε-caprolactone and lactides. NEW J CHEM 2016. [DOI: 10.1039/c5nj03159a] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The flexibility of ligands and their coordination chemistry with metal centers provided effective catalysts in the ring opening polymerization of cyclic esters.
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Affiliation(s)
- Ekemini D. Akpan
- School of Chemistry and Physics
- Westville Campus
- University of KwaZulu-Natal
- Private Bag X54001
- Durban
| | - Stephen O. Ojwach
- School of Chemistry and Physics
- Pietermaritzburg Campus
- University of KwaZulu-Natal
- Private Bag X01
- Scottsville
| | - Bernard Omondi
- School of Chemistry and Physics
- Westville Campus
- University of KwaZulu-Natal
- Private Bag X54001
- Durban
| | - Vincent O. Nyamori
- School of Chemistry and Physics
- Westville Campus
- University of KwaZulu-Natal
- Private Bag X54001
- Durban
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31
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Ji X, Luo X, Gao W, Mu Y. Zirconium and hafnium complexes with new tetra-azane ligands: Synthesis, characterization and catalytic properties for ethylene polymerization. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.10.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Dörfler J, Preuss T, Brahms C, Scheuer D, Doye S. Intermolecular hydroaminoalkylation of alkenes and dienes using a titanium mono(formamidinate) catalyst. Dalton Trans 2015; 44:12149-68. [PMID: 25679294 DOI: 10.1039/c4dt03916e] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An easily accessible formamidinate ligand-bearing titanium complex initially synthesized by Eisen et al. is used as catalyst for intermolecular hydroaminoalkylation reactions of unactivated, sterically demanding 1,1- and 1,2-disubstituted alkenes and styrenes with secondary amines. The corresponding reactions, which have never been achieved with titanium catalysts before, take place with excellent regioselectivity (up to 99 : 1) and in addition, corresponding reactions of 1,3-butadienes with N-methylbenzylamine are also described for the first time.
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Affiliation(s)
- Jaika Dörfler
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, D-26111 Oldenburg, Germany.
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33
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Lühning LH, Brahms C, Nimoth JP, Schmidtmann M, Doye S. A NewN-Trityl-Substituted Aminopyridinato Titanium Catalyst for Hydroamination and Hydroaminoalkylation Reactions - Unexpected Intramolecular C-H Bond Activation. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500542] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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34
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Group 4 metal complexes for homogeneous olefin polymerisation: a short tutorial review. APPLIED PETROCHEMICAL RESEARCH 2015. [DOI: 10.1007/s13203-015-0105-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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35
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Yang W, Chen Y, Sun WH. Correlating Cobalt Net Charges with Catalytic Activities of the 2-(Benzimidazolyl)-6-(1-aryliminoethyl)pyridylcobalt Complexes toward Ethylene Polymerization. MACROMOL REACT ENG 2015. [DOI: 10.1002/mren.201400064] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Wenhong Yang
- Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Yan Chen
- Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Wen-Hua Sun
- Key laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
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36
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Abstract
The current perspective will present the use of amidinate group 4 complexes in α-olefin polymerizations.
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Affiliation(s)
- Tatyana Elkin
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa 32000
- Israel
| | - Moris S. Eisen
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa 32000
- Israel
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37
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Haehnel M, Schubert K, Becker L, Arndt P, Spannenberg A, Rosenthal U. Reactions of Group 4 Metallocenes withN,N′-Diphenylformamidine - Hydrogen Generation versus Oxidative Addition. Z Anorg Allg Chem 2014. [DOI: 10.1002/zaac.201400316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Kulkarni NV, Elkin T, Tumaniskii B, Botoshansky M, Shimon LJW, Eisen MS. Asymmetric Bis(formamidinate) Group 4 Complexes: Synthesis, Structure and Their Reactivity in the Polymerization of α-Olefins. Organometallics 2014. [DOI: 10.1021/om500345r] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Naveen V. Kulkarni
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Tatyana Elkin
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Boris Tumaniskii
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Mark Botoshansky
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Linda J. W. Shimon
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Moris S. Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
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39
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Elkin T, Botoshansky M, Waymouth RM, Eisen MS. Titanium Bis(amidinates) Bearing Electron Donating Pendant Arms as Catalysts for Stereospecific Polymerization of Propylene. Organometallics 2014. [DOI: 10.1021/om401165g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Tatyana Elkin
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Mark Botoshansky
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Robert M. Waymouth
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Moris S. Eisen
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel
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40
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Karmel ISR, Elkin T, Fridman N, Eisen MS. Dimethylsilyl bis(amidinate)actinide complexes: synthesis and reactivity towards oxygen containing substrates. Dalton Trans 2014; 43:11376-87. [DOI: 10.1039/c4dt01361a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ligand1reacts with ThCl4and UCl4yielding complexes2and4, respectively. Complex3is obtained from complex2displaying extremely short Th–OH bond distances.
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Affiliation(s)
- Isabell S. R. Karmel
- Schulich Faculty of Chemistry
- Institute of Catalysis Science and Technology
- Technion – Israel Institute of Technology
- Technion City, 32000 Israel
| | - Tatyana Elkin
- Schulich Faculty of Chemistry
- Institute of Catalysis Science and Technology
- Technion – Israel Institute of Technology
- Technion City, 32000 Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry
- Institute of Catalysis Science and Technology
- Technion – Israel Institute of Technology
- Technion City, 32000 Israel
| | - Moris S. Eisen
- Schulich Faculty of Chemistry
- Institute of Catalysis Science and Technology
- Technion – Israel Institute of Technology
- Technion City, 32000 Israel
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