1
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Münster K, Fecker AC, Raeder J, Freytag M, Jones PG, Walter MD. Enantiomerically Pure Constrained Geometry Complexes of the Rare-Earth Metals Featuring a Dianionic N-Donor Functionalised Pentadienyl Ligand: Synthesis and Characterisation. Chemistry 2020; 26:16098-16110. [PMID: 32735382 PMCID: PMC7756846 DOI: 10.1002/chem.202003170] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 07/31/2020] [Indexed: 11/07/2022]
Abstract
We report the preparation of enantiomerically pure constrained geometry complexes (cgc) of the rare-earth metals bearing a pentadienyl moiety (pdl) derived from the natural product (1R)-(-)-myrtenal. The potassium salt 1, [Kpdl*], was treated with ClSiMe2 NHtBu, and the resulting pentadiene 2 was deprotonated with the Schlosser-type base KOtPen/nBuLi (tPen=CMe2 (CH2 Me)) to yield the dipotassium salt [K2 (pdl*SiMe2 NtBu)] (3). However, 3 rearranges in THF solution to its isomer 3' by a 1,3-H shift, which elongates the bridge between the pdl and SiMe2 NtBu moieties by one CH2 unit. This is crucial for the successful formation of various monomeric C1 - or dimeric C2 -symmetric rare-earth cgc complexes with additional halide, tetraborohydride, amido and alkyl functionalities. All compounds have been extensively characterised by solid-state X-ray diffraction analysis, solution NMR spectroscopy and elemental analyses.
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Affiliation(s)
- Katharina Münster
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Ann Christin Fecker
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Jan Raeder
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Matthias Freytag
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Peter G. Jones
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Marc D. Walter
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
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2
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Ge S, Zhao J, Ferguson MJ, Ma G, Cavell RG. Rare Carbon-Bridged Bimetallic Lanthanide (Nd or Sm) and Tl(I) Geminal Carbon Derivatives of a Bis(iminophosphorano)methanediide. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00836] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sai Ge
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, Shanxi Province 037009, People’s Republic of China
| | - Jianguo Zhao
- Institute of Carbon Materials Science, Shanxi Datong University, Datong, Shanxi Province 037009, People’s Republic of China
| | - Michael J. Ferguson
- Chemistry Department, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Guibin Ma
- Chemistry Department, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Ronald G. Cavell
- Chemistry Department, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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3
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Diteepeng N, Buffet JC, Turner ZR, O'Hare D. Constrained geometry scandium permethylindenyl complexes for the ring-opening polymerisation of l- and rac-lactide. Dalton Trans 2019; 48:16099-16107. [PMID: 31617518 DOI: 10.1039/c9dt03450a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterisation of constrained geometry scandium permethylindenyl chloride, aryloxide and borohydride complexes Me2SB(tBuN,I*)Sc(Cl)(THF) (1), Me2SB(tBuN,I*)Sc(O-2,6-iPr-C6H3)(THF) (2), Me2SB(tBuN,I*)Sc(O-2,4-tBu-C6H3)(THF) (3) and Me2SB(tBuN,I*)Sc(BH4)(THF) (4) are reported. The activity of complexes 1-4 as initiators for the ring-opening polymerisation (ROP) of l- and rac-lactide is presented. The ROP of l- and rac-lactide using complexes 2 and 3 show first-order dependence on monomer concentration, and produced isotactic polylactide (PLA) and moderately heterotactic PLA (Pr = 0.68-0.72), respectively. Good agreement between experimental and theoretical molecular weights of PLA (Mn) and relatively narrow dispersities (Mw/Mn < 1.20) were obtained. Complex 4 showed higher activity for ROP of l- and rac-lactide than 2 or 3, with second-order dependence on monomer concentrations. However, poorly controlled molecular weights and lower heteroselectivity (Pr = 0.61-0.67) were observed. The effect of temperature and catalyst concentration for the ROP of l-lactide using 2 and 3 was also studied.
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Affiliation(s)
- Nichabhat Diteepeng
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
| | - Jean-Charles Buffet
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
| | - Zoë R Turner
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
| | - Dermot O'Hare
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK.
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4
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Nguyen HN, Hultzsch KC. Rare-Earth-Metal-Catalyzed Kinetic Resolution of Chiral Aminoalkenes via Hydroamination: The Effect of the Silyl Substituent of the Binaphtholate Ligand on Resolution Efficiency. European J Org Chem 2019; 2019:2592-2601. [PMID: 31244549 PMCID: PMC6582503 DOI: 10.1002/ejoc.201900107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Indexed: 01/11/2023]
Abstract
The kinetic resolution of α-substituted aminopentenes via intramolecular hydroamination was investigated using various 3,3'-silyl-substituted binaphtholate yttrium catalysts. High efficiencies in the kinetic resolution were observed for methyl-, benzyl-, and phenyl-substituted substrates utilizing the cyclohexyldiphenylsilyl-substituted catalyst 2c with resolution factors reaching as high as 90(5) for hex-5-en-2-amine (3a). Kinetic analysis of the enantioenriched substrates with the matching and mismatching catalyst revealed that the efficiency of catalyst 2c benefits significantly from a favorable Curtin-Hammett pre-equilibrium and by a large kfast/kslow ratio. Other binaphtholate catalysts were less efficient due to a less favorable Curtin-Hammett pre-equilibrium, which often favored the mismatching substrate-catalyst combination. Cyclization of the matched substrate proceeds generally with large trans-selectivity, whereas the trans/cis-ratio for mismatched substrates is significantly diminished, favoring the cis-cyclization product isomer in some instances.
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Affiliation(s)
- Hiep N Nguyen
- Department of Chemistry and Chemical Biology Rutgers, The State University of New Jersey 610 Taylor Road 8087 Piscataway, New Jersey 08854- USA
| | - Kai C Hultzsch
- Universität Wien Fakultät für Chemie Institut für Chemische Katalyse Währinger Straße 38 1090 Wien Austria
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5
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Seifert TP, Brunner TS, Fischer TS, Barner-Kowollik C, Roesky PW. Chiral Mono(borohydride) Complexes of Scandium and Lutetium and Their Catalytic Activity in Ring-Opening Polymerization of dl-Lactide. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00172] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tim P. Seifert
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
| | - Tobias S. Brunner
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
| | - Tobias S. Fischer
- Macromolecular Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76128 Karlsruhe, Germany
- Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Christopher Barner-Kowollik
- Macromolecular Architectures, Institut für Technische Chemie und Polymerchemie, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76128 Karlsruhe, Germany
- Institut für Biologische Grenzflächen, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia
| | - Peter W. Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany
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6
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Mandal S, Verma PK, Geetharani K. Lewis acid catalysis: regioselective hydroboration of alkynes and alkenes promoted by scandium triflate. Chem Commun (Camb) 2018; 54:13690-13693. [DOI: 10.1039/c8cc08361d] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
An unprecedented scandium-catalysed hydroboration of alkynes and alkenes has been achieved with HBpin in presence of catalytic amount of NaBHEt3.
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Affiliation(s)
- Souvik Mandal
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - Piyush Kumar Verma
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
| | - K. Geetharani
- Department of Inorganic and Physical Chemistry
- Indian Institute of Science
- Bangalore 560012
- India
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7
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8
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Zhang X, Tobisch S, Hultzsch KC. σ-Insertive Mechanism versus Concerted Non-insertive Mechanism in the Intramolecular Hydroamination of Aminoalkenes Catalyzed by Phenoxyamine Magnesium Complexes: A Synthetic and Computational Study. Chemistry 2015; 21:7841-57. [DOI: 10.1002/chem.201406468] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 03/09/2015] [Indexed: 11/08/2022]
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9
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Schmid M, Oña-Burgos P, Guillaume SM, Roesky PW. (Iminophosphoranyl)(thiophosphoranyl)methane rare-earth borohydride complexes: synthesis, structures and polymerization catalysis. Dalton Trans 2015; 44:12338-48. [DOI: 10.1039/c4dt04034a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The {CH(PPh2NSiMe3)(PPh2S)}−ligand has been used for the synthesis of divalent and trivalent rare-earth borohydride complexes. These compounds enable the ring-opening polymerization (ROP) of ε-caprolactone (CL) and trimethylene carbonate (TMC).
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Affiliation(s)
- Matthias Schmid
- Institut für Anorganische Chemie
- Karlsruher Institut für Technologie (KIT)
- 76131 Karlsruhe
- Germany
- Institut des Sciences Chimiques de Rennes
| | - Pascual Oña-Burgos
- Institut für Anorganische Chemie
- Karlsruher Institut für Technologie (KIT)
- 76131 Karlsruhe
- Germany
- Department of Chemistry and Physics
| | - Sophie M. Guillaume
- Institut des Sciences Chimiques de Rennes
- CNRS - Université de Rennes 1 (UMR 6226)
- Organometallics
- Materials and Catalysis
- Campus de Beaulieu
| | - Peter W. Roesky
- Institut für Anorganische Chemie
- Karlsruher Institut für Technologie (KIT)
- 76131 Karlsruhe
- Germany
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10
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Schmid M, Guillaume SM, Roesky PW. β-Diketiminate Rare Earth Borohydride Complexes: Synthesis, Structure, and Catalytic Activity in the Ring-Opening Polymerization of ε-Caprolactone and Trimethylene Carbonate. Organometallics 2014. [DOI: 10.1021/om500708x] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Matthias Schmid
- Institut
für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse 15, 76131 Karlsruhe, Germany
- Institut
für Ressourcenökologie, Helmholtz-Zentrum Dresden-Rossendorf e. V., Bautzner Landstraße 400, 01328 Dresden, Germany
- Institut
des Sciences Chimiques de Rennes, CNRS - Université de Rennes 1 (UMR 6226), Organometallics:
Materials and Catalysis, Campus de
Beaulieu, 35042 Rennes Cedex, France
| | - Sophie M. Guillaume
- Institut
des Sciences Chimiques de Rennes, CNRS - Université de Rennes 1 (UMR 6226), Organometallics:
Materials and Catalysis, Campus de
Beaulieu, 35042 Rennes Cedex, France
| | - Peter W. Roesky
- Institut
für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse 15, 76131 Karlsruhe, Germany
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11
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Chen DY, Zou JH, Li WX, Xu B, Li QY, Yang GW, Wang J, Ding YM, Zhang Y, Shen XF. Synthesis, crystal structure and catalytic property of a samarium complex with Hpytza [Hpytza=5-(3-pyridyl) tetrazole-2-acetic acid]. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2013.11.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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2,5-Bis{N-(2,6-diisopropylphenyl)iminomethyl}pyrrolyl borohydride complexes of the divalent lanthanides – Synthesis, structures and ring-opening polymerization of ε-caprolactone. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.04.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Murugesapandian B, Kuzdrowska M, Gamer MT, Hartenstein L, Roesky PW. (Iminophosphoranyl)(thiophosphoranyl)methanide {CH(PPh2NSiMe3)(Ph2PS)}− as a Ligand in Rare-Earth-Element Chemistry. Organometallics 2013. [DOI: 10.1021/om400001e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
| | - Magdalena Kuzdrowska
- Institut für
Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse 15, 76131
Karlsruhe, Germany
| | - Michael T. Gamer
- Institut für
Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse 15, 76131
Karlsruhe, Germany
| | - Larissa Hartenstein
- Institut für
Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse 15, 76131
Karlsruhe, Germany
| | - Peter W. Roesky
- Institut für
Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstrasse 15, 76131
Karlsruhe, Germany
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14
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Reznichenko AL, Hultzsch KC. C1-Symmetric Rare-Earth-Metal Aminodiolate Complexes for Intra- and Intermolecular Asymmetric Hydroamination of Alkenes. Organometallics 2013. [DOI: 10.1021/om3010614] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexander L. Reznichenko
- Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, United States
| | - Kai C. Hultzsch
- Department of Chemistry & Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854-8087, United States
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15
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Demir S, Siladke NA, Ziller JW, Evans WJ. Scandium and yttrium metallocene borohydride complexes: comparisons of (BH4)1−vs. (BPh4)1− coordination and reactivity. Dalton Trans 2012; 41:9659-66. [DOI: 10.1039/c2dt30861d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Pan Y, Xu T, Ge YS, Lu XB. N-heterocyclic Carbene Scandium Complexes: Synthesis, Structure, and Catalytic Performance for α-Olefin Polymerization and Copolymerization with 1,5-Hexadiene. Organometallics 2011. [DOI: 10.1021/om200550j] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Yu Pan
- State Key Laboratory of Fine Chemicals, College of Chemistry, Dalian University of Technology, Dalian 116024, People's Republic of China
| | - Tieqi Xu
- State Key Laboratory of Fine Chemicals, College of Chemistry, Dalian University of Technology, Dalian 116024, People's Republic of China
| | - Yan-Shu Ge
- State Key Laboratory of Fine Chemicals, College of Chemistry, Dalian University of Technology, Dalian 116024, People's Republic of China
| | - Xiao-Bing Lu
- State Key Laboratory of Fine Chemicals, College of Chemistry, Dalian University of Technology, Dalian 116024, People's Republic of China
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17
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Guillaume SM, Brignou P, Susperregui N, Maron L, Kuzdrowska M, Roesky PW. Bis(phosphinimino)methanide borohydride complexes of the rare-earth elements as initiators for the polymerization of methyl methacrylate: combined experimental and computational investigations. Polym Chem 2011. [DOI: 10.1039/c1py00133g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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