51
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Romero N, Dufrois Q, Vendier L, Dinoi C, Etienne M. Highly Fluorinated Tris(indazolyl)borate Hydrocarbyl Complexes of Calcium and Magnesium: Synthesis and Structural Studies. Organometallics 2017. [DOI: 10.1021/acs.organomet.6b00783] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nuria Romero
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, LCC, 31077 Toulouse
Cedex 4, France
| | - Quentin Dufrois
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, LCC, 31077 Toulouse
Cedex 4, France
| | - Laure Vendier
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, LCC, 31077 Toulouse
Cedex 4, France
| | - Chiara Dinoi
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, LCC, 31077 Toulouse
Cedex 4, France
| | - Michel Etienne
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
- Université de Toulouse, UPS, INPT, LCC, 31077 Toulouse
Cedex 4, France
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52
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Roşca SC, Dorcet V, Roisnel T, Carpentier JF, Sarazin Y. Tethered cationic alkaline earth – olefin complexes. Dalton Trans 2017; 46:14785-14794. [DOI: 10.1039/c7dt03300a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The utilisation of a specifically tailored aminofluoroalcohol possessing both a methoxy and an olefin dangling side arms enables the preparation of the first examples of discrete calcium- and strontium-olefin cationic complexes.
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Affiliation(s)
- Sorin-Claudiu Roşca
- Université de Rennes 1
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes Cedex
| | - Vincent Dorcet
- Université de Rennes 1
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes Cedex
| | - Thierry Roisnel
- Université de Rennes 1
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes Cedex
| | | | - Yann Sarazin
- Université de Rennes 1
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes Cedex
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53
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Geier SJ, LaFortune JHW, Zhu D, Kosnik SC, Macdonald CLB, Stephan DW, Westcott SA. The phosphinoboration of carbodiimides, isocyanates, isothiocyanates and CO2. Dalton Trans 2017; 46:10876-10885. [DOI: 10.1039/c7dt02305g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The transition metal-free addition of phosphinoboronate ester Ph2PBpin (pin = 1,2-O2C2Me4) to heterocumulenes including carbodiimides, isocyanates, isothiocyanates and carbon dioxide proceeds with remarkable selectivity to give products in high yield.
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Affiliation(s)
- Stephen J. Geier
- Department of Chemistry and Biochemistry
- Mount Allison University
- Sackville
- Canada
| | | | - Diya Zhu
- Department of Chemistry and Biochemistry
- Mount Allison University
- Sackville
- Canada
- Department of Chemistry
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54
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Ward BJ, Hunt PA. Hydrophosphination of Styrene and Polymerization of Vinylpyridine: A Computational Investigation of Calcium-Catalyzed Reactions and the Role of Fluxional Noncovalent Interactions. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02251] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bryan J. Ward
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
| | - Patricia A. Hunt
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
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55
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Schnitzler S, Spaniol TP, Okuda J. Reactivity of a Molecular Magnesium Hydride Featuring a Terminal Magnesium–Hydrogen Bond. Inorg Chem 2016; 55:12997-13006. [DOI: 10.1021/acs.inorgchem.6b02509] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Silvia Schnitzler
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany
| | - Thomas P. Spaniol
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany
| | - Jun Okuda
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, D-52056 Aachen, Germany
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56
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De Tullio M, Hernán-Gómez A, Livingstone Z, Clegg W, Kennedy AR, Harrington RW, Antiñolo A, Martínez A, Carrillo-Hermosilla F, Hevia E. Structural and Mechanistic Insights into s-Block Bimetallic Catalysis: Sodium Magnesiate-Catalyzed Guanylation of Amines. Chemistry 2016; 22:17646-17656. [PMID: 27786387 DOI: 10.1002/chem.201602906] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Indexed: 11/06/2022]
Abstract
To advance the catalytic applications of s-block mixed-metal complexes, sodium magnesiate [NaMg(CH2 SiMe3 )3 ] (1) is reported as an efficient precatalyst for the guanylation of a variety of anilines and secondary amines with carbodiimides. First examples of hydrophosphination of carbodiimides by using a Mg catalyst are also described. The catalytic ability of the mixed-metal system is much greater than that of its homometallic components [NaCH2 SiMe3 ] and [Mg(CH2 SiMe3 )2 ]. Stoichiometric studies suggest that magnesiate amido and guanidinate complexes are intermediates in these catalytic routes. Reactivity and kinetic studies imply that these guanylation reactions occur via (tris)amide intermediates that react with carbodiiimides in insertion steps. The rate law for the guanylation of N,N'-diisopropylcarbodiimide with 4-tert-butylaniline catalyzed by 1 is first order with respect to [amine], [carbodiimide], and [catalyst], and the reaction shows a large kinetic isotopic effect, which is consistent with an amine-assisted rate-determining carbodiimide insertion transition state. Studies to assess the effect of sodium in these transformations denote a secondary role with little involvement in the catalytic cycle.
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Affiliation(s)
- Marco De Tullio
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Alberto Hernán-Gómez
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Zoe Livingstone
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - William Clegg
- School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Alan R Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Ross W Harrington
- School of Chemistry, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Antonio Antiñolo
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha Campus Universitario, 13071, Ciudad Real, Spain
| | - Antonio Martínez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha Campus Universitario, 13071, Ciudad Real, Spain
| | - Fernando Carrillo-Hermosilla
- Centro de Innovación en Química Avanzada (ORFEO-CINQA) Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias y Tecnologías Químicas, Universidad de Castilla-La Mancha Campus Universitario, 13071, Ciudad Real, Spain
| | - Eva Hevia
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
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57
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Langer J, Kosygin I, Puchta R, Pahl J, Harder S. A Soft Grip: Magnesium Complexes with a Phosphine-Modified Phosphonium Diylidic Lewis Base. Chemistry 2016; 22:17425-17435. [DOI: 10.1002/chem.201603775] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Jens Langer
- Inorganic and Organometallic Chemistry; Friedrich-Alexander University Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
- Inorganic and Analytical Chemistry; Friedrich-Schiller University Jena; Humboldtstraße 8 07743 Jena Germany
| | - Irina Kosygin
- Inorganic and Organometallic Chemistry; Friedrich-Alexander University Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
| | - Ralph Puchta
- Inorganic and Organometallic Chemistry; Friedrich-Alexander University Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
| | - Jürgen Pahl
- Inorganic and Organometallic Chemistry; Friedrich-Alexander University Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
| | - Sjoerd Harder
- Inorganic and Organometallic Chemistry; Friedrich-Alexander University Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Germany
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58
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Wilkins LC, Melen RL. Enantioselective Main Group Catalysis: Modern Catalysts for Organic Transformations. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.07.011] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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59
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Härling SM, Görls H, Krieck S, Westerhausen M. Potassium-Mediated Hydrophosphorylation of Heterocumulenes with Diarylphosphane Oxide and Sulfide. Inorg Chem 2016; 55:10741-10750. [DOI: 10.1021/acs.inorgchem.6b01973] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stephan M. Härling
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse 8, D-07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse 8, D-07743 Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse 8, D-07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Humboldtstrasse 8, D-07743 Jena, Germany
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60
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Müller C, Krieck S, Görls H, Westerhausen M. Synthesis of Lewis Base Adducts of Barium Bis[bis(trimethylsilyl)amide]. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600561] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Christoph Müller
- Institute of Inorganic and Analytical ChemistryFriedrich‐Schiller‐University JenaHumboldtstr. 807743JenaGermany
| | - Sven Krieck
- Institute of Inorganic and Analytical ChemistryFriedrich‐Schiller‐University JenaHumboldtstr. 807743JenaGermany
| | - Helmar Görls
- Institute of Inorganic and Analytical ChemistryFriedrich‐Schiller‐University JenaHumboldtstr. 807743JenaGermany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical ChemistryFriedrich‐Schiller‐University JenaHumboldtstr. 807743JenaGermany
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61
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Kalden D, Oberheide A, Loh C, Görls H, Krieck S, Westerhausen M. Surprisingly Different Reaction Behavior of Alkali and Alkaline Earth Metal Bis(trimethylsilyl)amides toward Bulky N
-(2-Pyridylethyl)-N′
-(2,6-diisopropylphenyl)pivalamidine. Chemistry 2016; 22:10944-59. [DOI: 10.1002/chem.201602074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Indexed: 01/22/2023]
Affiliation(s)
- Diana Kalden
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University; Humboldstrasse 8 07743 Jena Germany
| | - Ansgar Oberheide
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University; Humboldstrasse 8 07743 Jena Germany
| | - Claas Loh
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University; Humboldstrasse 8 07743 Jena Germany
| | - Helmar Görls
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University; Humboldstrasse 8 07743 Jena Germany
| | - Sven Krieck
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University; Humboldstrasse 8 07743 Jena Germany
| | - Matthias Westerhausen
- Institute of Inorganic and Analytical Chemistry; Friedrich Schiller University; Humboldstrasse 8 07743 Jena Germany
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62
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Sarazin Y, Carpentier JF. Calcium, Strontium and Barium Homogeneous Catalysts for Fine Chemicals Synthesis. CHEM REC 2016; 16:2482-2505. [PMID: 27353504 DOI: 10.1002/tcr.201600067] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Indexed: 01/22/2023]
Abstract
The large alkaline earths (Ae), calcium, strontium and barium, have in the past 15 years yielded a brand new generation of heteroleptic molecular catalysts for the production of fine chemicals. However, the integrity of these complexes is often plagued by ligand redistribution equilibria in solution. This personal account retraces the paths followed in our research group towards the design of stable heteroleptic alkalino-earth complexes, including the use of intramolecular noncovalent Ae···H-Si and Ae···F-C interactions. Their implementation as homogenous precatalysts for reactions such as the intramolecular and intermolecular hydroamination and hydrophosphination of activated alkenes, the hydrophosphonylation of ketones, and the dehydrogenative coupling of amines and hydrosilanes that enable the efficient and controlled formations of CP, CN, or SiN σ-bonds, is presented in a synthetic perspective that highlights their overall outstanding catalytic performance.
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Affiliation(s)
- Yann Sarazin
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
| | - Jean-François Carpentier
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes UMR 6226 CNRS - Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France
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63
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Anga S, Bhattacharjee J, Banerjee I, Nayek HP, Panda TK. Calcium Complexes Having Different Amidinate Ligands - Synthesis and Structural Diversity. ChemistrySelect 2016. [DOI: 10.1002/slct.201600299] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Srinivas Anga
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi - 502 285 Sangareddy, Telangana India
| | - Jayeeta Bhattacharjee
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi - 502 285 Sangareddy, Telangana India
| | - Indrani Banerjee
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi - 502 285 Sangareddy, Telangana India
| | - Hari Pada Nayek
- Department of Applied Chemistry; Indian School of Mines, Dhanbad; 826004 Jharkhand India
| | - Tarun K. Panda
- Department of Chemistry; Indian Institute of Technology Hyderabad; Kandi - 502 285 Sangareddy, Telangana India
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64
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Fohlmeister L, Stasch A. Ring-Shaped Phosphinoamido-Magnesium-Hydride Complexes: Syntheses, Structures, Reactivity, and Catalysis. Chemistry 2016; 22:10235-46. [PMID: 27271460 DOI: 10.1002/chem.201601623] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Indexed: 11/10/2022]
Abstract
A series of magnesium(II) complexes bearing the sterically demanding phosphinoamide ligand, L(-) =Ph2 PNDip(-) , Dip=2,6-diisopropylphenyl, including heteroleptic magnesium alkyl and hydride complexes are described. The ligand geometry enforces various novel ring and cluster geometries for the heteroleptic compounds. We have studied the stoichiometric reactivity of [(LMgH)4 ] towards unsaturated substrates, and investigated catalytic hydroborations and hydrosilylations of ketones and pyridines. We found that hydroborations of two ketones with pinacolborane using various Mg precatalysts is very rapid at room temperature with very low catalyst loadings, and ketone hydrosilylation using phenylsilane is rapid at 70 °C. Our studies point to an insertion/σ-bond metathesis catalytic cycle of an in situ formed "MgH2 " active species.
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Affiliation(s)
- Lea Fohlmeister
- School of Chemistry, Monash University, 17 Rainforest Walk, Melbourne, Victoria, 3800, Australia
| | - Andreas Stasch
- School of Chemistry, Monash University, 17 Rainforest Walk, Melbourne, Victoria, 3800, Australia. .,School of Chemistry, University of St Andrews, North Haugh, St. Andrews, KY16 9ST, UK.
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65
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Nijesh K, De S, Parameswaran P. Homopolar dihydrogen bonding in ligand stabilized diberyllium hydride complexes, Be2(CH3)2H2L2 (L = H(-), CO, N-heterocyclic carbene and CN(-)). Dalton Trans 2016; 45:7836-46. [PMID: 27051892 DOI: 10.1039/c5dt04293c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure and bonding of diberyllium hydride complexes Be2(CH3)2H2L2, where L = H(-) (), CO (), NHC () and CN(-) () were studied in detail and compared with isostructural diborane (). The bonding in Be2(CH3)2H2L2 was analyzed considering the interaction of two Be(CH3)L fragments with the bridging (μ-H)2 fragment. The geometrical and molecular orbital (MO) analyses indicate that the extent of back donation from Be→L (L = CO, NHC and CN(-)) is less in Be2(CH3)2H2L2 as compared to that in Be(CH3)L fragments. The NBO, MO and QTAIM analyses indicate a significant charge concentration at the bridging (μ-H)2 in Be2(CH3)2H2L2, whereas charge depletion is observed at the (μ-H)2 fragment in diborane. The accumulation of electron density at the bridging (μ-H)2 is duly reflected in the detection of a (μ-H)-(μ-H) bond path in Be2(CH3)2H2L2, in spite of having longer (μ-H)-(μ-H) distances. The interaction between the bridging H-atoms in diberyllium hydride complexes can be considered as homopolar hydride-hydride dihydrogen bonding. The direction of the charge flow is from (μ-H)2 to BH2 in diborane, whereas from Be(CH3)L to (μ-H)2 in Be2(CH3)2H2L2. Hence, the bridging (μ-H)2 fragments in Be2(CH3)2H2L2 are electron rich as compared to the (μ-H)2 fragment in diborane. The experimental report of the ring opening of the (Ar)NHC (Ar = 2,4,6-trimethylphenyl) ligand through hydride transfer from [Be(CH3)H((Ar)NHC)]2 corroborates well with the presence of electron rich bridging (μ-H)2 in diberyllium hydride complexes.
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Affiliation(s)
- Karikkeeriyil Nijesh
- Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala, 673 601 India.
| | - Susmita De
- Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala, 673 601 India.
| | - Pattiyil Parameswaran
- Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala, 673 601 India.
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66
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Younis FM, Krieck S, Al-Shboul TMA, Görls H, Westerhausen M. Calcium-Mediated Catalytic Synthesis of 1-(Diorganylamino)-1,4-diphenyl-4-(diphenylphosphanyl)buta-1,3-dienes. Inorg Chem 2016; 55:4676-82. [DOI: 10.1021/acs.inorgchem.6b00586] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fadi M. Younis
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University (FSU), Humboldstraße
8, D-07743 Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University (FSU), Humboldstraße
8, D-07743 Jena, Germany
| | - Tareq M. A. Al-Shboul
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University (FSU), Humboldstraße
8, D-07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University (FSU), Humboldstraße
8, D-07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and
Analytical Chemistry, Friedrich Schiller University (FSU), Humboldstraße
8, D-07743 Jena, Germany
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67
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Abstract
Simple tin derivatives, Cp*2SnCl2 (1) and Ph2SnCl2 (2), catalyze the hydrophosphination of alkene substrates with diphenylphosphine. Competitive dehydrocoupling to give Ph4P2 was observed, but this side reaction can be mitigated when the catalysis is conducted under an H2 atmosphere. Efforts to prepare stable tin bis(phosphido) compounds commonly resulted in decomposition to Ph4P2. Lewis acidic inorganic tin compounds do not show dehydrocoupling reactivity. It was found that the Lewis acid, B(C6F5)3, is able to engage in the hydrophosphination of alkenes, but it is poorly effective under the conditions tested.
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Affiliation(s)
- John P W Stelmach
- Department of Chemistry, University of Vermont, Cook Physical Sciences Building, Burlington, Vermont 05405, USA.
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68
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Goodwin CAP, Smith A, Ortu F, Vitorica-Yrezabal IJ, Mills DP. Salt metathesis versus protonolysis routes for the synthesis of silylamide Hauser base (R2NMgX; X = halogen) and amido-Grignard (R2NMgR) complexes. Dalton Trans 2016; 45:6004-14. [PMID: 26275169 DOI: 10.1039/c5dt02535d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The preparation of silylamide Hauser base (R2NMgX; X = halide) and amido-Grignard (R2NMgR) complexes from simple Grignard reagents using [K{N(SiMe2(t)Bu)2}]n, [K{N(SiMe2(t)Bu)(Si(i)Pr3)}]n and [K{N(Si(i)Pr3)2}]n, and their parent silylamines, was explored. Both salt metathesis and protonolysis routes proved ineffective with allylmagnesium chloride as a starting material due to complex Schlenk equilibria, with [Mg(N(RR'))(μ-Cl)(THF)]2 (N(RR') = {N(Si(t)BuMe2)2}(-), 1; {N(Si(t)BuMe2)(Si(i)Pr3)}(-), 2; {N(Si(i)Pr3)2}(-), 3) and [Mg{N(Si(i)Pr3)2}(μ-C3H5)]∞ (4) identified as minor products. In contrast, salt metathesis protocols using potassium silylamides and methylmagnesium iodide gave [Mg(N(RR'))(μ-CH3)]2 (N(RR') = {N(Si(t)BuMe2)2}(-), 7a; {N(Si(t)BuMe2)(Si(i)Pr3)}(-), 8; {N(Si(i)Pr3)2}(-), 9) and [Mg{N(Si(t)BuMe2)2}(CH3)(DME)] (7b), with [Mg{N(Si(t)BuMe2)2}(μ-I)(THF)]2 (10) isolated as a side-product during the preparation of 7a. Unusually, methylmagnesium iodide, di-n-butylmagnesium and 7-9 did not react with HN(RR') under the conditions we employed. The synthesis of [Na{N(Si(t)BuMe2)2}(THF)]2 (5a) and [Na{N(Si(t)BuMe2)2}(DME)2] (5b) from benzyl sodium and HN(Si(t)BuMe2)2, and a solvent-free structure of [K{N(Si(t)BuMe2)2}] (6), are also reported. Complexes 1, 5b, 7a, 7b, 8, 9 and 10 are fully characterised by single crystal XRD, multinuclear NMR and IR spectroscopy and elemental analysis, whereas complexes 2-4, 5a and 6 were identified by XRD only.
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Affiliation(s)
- Conrad A P Goodwin
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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69
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Weetman C, Hill MS, Mahon MF. Magnesium Catalysis for the Hydroboration of Carbodiimides. Chemistry 2016; 22:7158-62. [DOI: 10.1002/chem.201600681] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Catherine Weetman
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Michael S. Hill
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Mary F. Mahon
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
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70
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Roşca SC, Dinoi C, Caytan E, Dorcet V, Etienne M, Carpentier JF, Sarazin Y. Alkaline Earth-Olefin Complexes with Secondary Interactions. Chemistry 2016; 22:6505-9. [DOI: 10.1002/chem.201601096] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Sorin-Claudiu Roşca
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS; Université de Rennes 1, Campus de Beaulieu; 263 avenue du Général Leclerc 35042 Rennes Cedex France
| | - Chiara Dinoi
- CNRS; LCC (Laboratoire de Chimie de Coordination); 205 route de Narbonne 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT, LCC; 31077 Toulouse Cedex 4 France
| | - Elsa Caytan
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS; Université de Rennes 1, Campus de Beaulieu; 263 avenue du Général Leclerc 35042 Rennes Cedex France
| | - Vincent Dorcet
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS; Université de Rennes 1, Campus de Beaulieu; 263 avenue du Général Leclerc 35042 Rennes Cedex France
| | - Michel Etienne
- CNRS; LCC (Laboratoire de Chimie de Coordination); 205 route de Narbonne 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT, LCC; 31077 Toulouse Cedex 4 France
| | - Jean-François Carpentier
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS; Université de Rennes 1, Campus de Beaulieu; 263 avenue du Général Leclerc 35042 Rennes Cedex France
| | - Yann Sarazin
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS; Université de Rennes 1, Campus de Beaulieu; 263 avenue du Général Leclerc 35042 Rennes Cedex France
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71
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Wei B, Li H, Zhang WX, Xi Z. Calcium-Mediated C–H and C–F Bond Cleavage: Synthesis of Indenes and Perfluorodibenzopentalenes from 1,4-Dilithio-1,3-butadienes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00073] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Baosheng Wei
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, People’s Republic of China
| | - Heng Li
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, People’s Republic of China
| | - Wen-Xiong Zhang
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, People’s Republic of China
| | - Zhenfeng Xi
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, People’s Republic of China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry (SIOC), Chinese Academy of Sciences, Shanghai 200032, People’s Republic of China
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72
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Liu Q, Wang C, Zhang X, Xue M, Yao Y, Zhang Y, Shen Q. Synthesis and molecular structures of divalent bridged bis(guanidinate) europium complexes and their application in intermolecular hydrophosphination of alkenes and alkynes. NEW J CHEM 2016. [DOI: 10.1039/c6nj02508k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bimetallic EuIIcomplexes supported by bridged bis(guanidinate) ligands are efficient precatalysts for the intermolecular hydrophosphination of alkenes and alkynes.
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Affiliation(s)
- Qianqian Liu
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Chuanyong Wang
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Xingmin Zhang
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Mingqiang Xue
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Yingming Yao
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Yong Zhang
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
| | - Qi Shen
- The Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Dushu Lake Campus
- Soochow University
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73
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Anga S, Carpentier JF, Panda TK, Roisnel T, Sarazin Y. Calcium complexes with imino-phosphinanilido chalcogenide ligands for heterofunctionalisation catalysis. RSC Adv 2016. [DOI: 10.1039/c6ra13117d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Syntheses, characterisation and utilisation of the calcium complexes supported by imino-phosphinanilido chalcogenide ligands {Ph2P(E)–N–C6H4–CHN(Dipp)} (E = S, Se) as molecular precatalysts for the heterofunctionalisation of styrene are reported.
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Affiliation(s)
- Srinivas Anga
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| | - Jean-François Carpentier
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes 1
- Organometallics: Materials and Catalysis Centre
- F-35042 Rennes Cedex
| | - Tarun K. Panda
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes 1
- Organometallics: Materials and Catalysis Centre
- F-35042 Rennes Cedex
| | - Yann Sarazin
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS
- Université de Rennes 1
- Organometallics: Materials and Catalysis Centre
- F-35042 Rennes Cedex
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74
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Weetman C, Hill MS, Mahon MF. Magnesium-catalysed hydroboration of pyridines: Kinetic analysis and poly-pyridine dearomatisation. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.08.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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75
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Kottalanka RK, Harinath A, Rej S, Panda TK. Group 1 and group 2 metal complexes supported by a bidentate bulky iminopyrrolyl ligand: synthesis, structural diversity, and ε-caprolactone polymerization study. Dalton Trans 2015; 44:19865-79. [PMID: 26511076 DOI: 10.1039/c5dt03222a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report here a series of alkali and alkaline earth metal complexes, each with a bulky iminopyrrolyl ligand [2-(Ph3CN=CH)C4H3NH] (1-H) moiety in their coordination sphere, synthesized using either alkane elimination or silylamine elimination methods or the salt metathesis route. The lithium salt of molecular composition [Li(2-(Ph3CN=CH)C4H3N)(THF)2] (2) was prepared using the alkane elimination method, and the silylamine elimination method was used to synthesize the dimeric sodium and tetra-nuclear potassium salts of composition [(2-(Ph3CN=CH)C4H3N)Na(THF)]2 (3) and [(2-(Ph3CN=CH)C4H3N)K(THF)0.5]4 (4) respectively. The magnesium complex of composition [(THF)2Mg(CH2Ph){2-(Ph3CN=CH)C4H3N}] (5) was synthesized through the alkane elimination method, in which [Mg(CH2Ph)2(OEt2)2] was treated with the bulky iminopyrrole ligand 1-H in 1 : 1 molar ratio, whereas the bis(iminopyrrolyl)magnesium complex [(THF)2Mg{2-(Ph3CN=CH)C4H3N}2] (6) was isolated using the salt metathesis route. The heavier alkaline earth metal complexes of the general formula {(THF)nM(2-(Ph3CN=CH)C4H3N)2} [M = Ca (7), Sr (8), and n = 2; M = Ba (9), n = 3] were prepared in pure form using two synthetic methods: in the first method, the bulky iminopyrrole ligand 1-H was directly treated with the alkaline earth metal precursor [M{N(SiMe3)2}2(THF)n] (where M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent at ambient temperature. The complexes 7-9 were also obtained using the salt metathesis reaction, which involves the treatment of the potassium salt (4) with the corresponding metal diiodides MI2 (M = Ca, Sr and Ba) in 2 : 1 molar ratio in THF solvent. The molecular structures of all the metal complexes (1-H, 2-9) in the solid state were established through single-crystal X-ray diffraction analysis. The complexes 5-9 were tested as catalysts for the ring-opening polymerization of ε-caprolactone. High activity was observed in the heavier alkaline earth metal complexes 7-9, with a very narrow polydispersity index in comparison to that of magnesium complexes 5 and 6.
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Affiliation(s)
- Ravi K Kottalanka
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - A Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Supriya Rej
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi - 502 285, Sangareddy, Telangana, India.
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76
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Younis FM, Krieck S, Görls H, Westerhausen M. Hydroamination of diphenylbutadiyne with secondary N-methyl-anilines using the dipotassium tetrakis(2,6-diisopropylanilino)calciate precatalyst. Dalton Trans 2015; 45:6241-50. [PMID: 26634234 DOI: 10.1039/c5dt03818a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The approved precatalyst [K2Ca{N(H)Dipp}4] was employed to study the hydroamination of diphenylbutadiyne with N-methyl-anilines in tetrahydrofuran at room temperature. The hydroamination occurs regioselectively within a few hours yielding (N-methyl)-(N-aryl)-1,4-diphenylbut-1-ene-3-yne-1-ylamine with phenyl (1a), 4-tolyl (1b) and 4-fluorophenyl groups (1c). In all cases a mixture of E- and Z-isomers is obtained. The second hydroamination step requires drastically extended reaction times and is successful only for the reaction of diphenylbutadiyne with N-methyl-aniline and N-methyl-4-fluoroaniline giving 1,4-diphenyl-1,4-bis(N-methyl-anilino)buta-1,3-diene [R = H (2a) and F (2c)]; a mixture of E,E-, E,Z- and Z,Z-isomers is obtained. The X-ray structures of E-1a, E-1b and E-1c show a slightly shortened N-C bond to the alkene moieties. Due to enhanced steric strain the anilino units of Z,Z-2c and Z,Z-3 turn away from the butadiene unit and consequently, the lone pair at the planar nitrogen atoms slightly interacts with the adjacent aryl groups.
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Affiliation(s)
- Fadi M Younis
- Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University Jena, Humboldtstr. 8, D-07743 Jena, Germany.
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77
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Moxey GJ, Blake AJ, Lewis W, Kays DL. Alkaline Earth Complexes of a Sterically Demanding Guanidinate Ligand. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501239] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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78
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Liu N, Yao C, Lin F, Liu B, Cui D. An intensification and integration process of preparing thermal stable polylactide end-capped by phosphate ester. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.10.044] [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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79
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Bhattacharjee J, Das S, Reddy TDN, Nayek HP, Mallik BS, Panda TK. Alkali Metal and Alkaline Earth Metal Complexes with the Bis(borane-diphenylphosphanyl)amido Ligand - Synthesis, Structures, and Catalysis for Ring-Opening Polymerization of ϵ-Caprolactone. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201500593] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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80
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Rochat R, Lopez MJ, Tsurugi H, Mashima K. Recent Developments in Homogeneous Organomagnesium Catalysis. ChemCatChem 2015. [DOI: 10.1002/cctc.201500853] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Raphaël Rochat
- Department of Chemistry, Graduate School of Engineering Science Osaka University and CREST, JST Toyonaka Osaka 560-8531 Japan
| | - Michael J. Lopez
- Department of Chemistry, Graduate School of Engineering Science Osaka University and CREST, JST Toyonaka Osaka 560-8531 Japan
| | - Hayato Tsurugi
- Department of Chemistry, Graduate School of Engineering Science Osaka University and CREST, JST Toyonaka Osaka 560-8531 Japan
| | - Kazushi Mashima
- Department of Chemistry, Graduate School of Engineering Science Osaka University and CREST, JST Toyonaka Osaka 560-8531 Japan
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81
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Harder S, Ruspic C. Probing the Salt‐Metathesis Route to Bis(aryl)calcium Compounds: Structure of an Arylcalcate Complex. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501178] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sjoerd Harder
- Inorganic and Organometallic Chemistry, University Erlangen‐Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany, www.harder‐research.com
| | - Christian Ruspic
- Anorganische Chemie, Universität Duisburg‐Essen, Universitätsstrasse 5, 45117 Essen, Germany
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82
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Weetman C, Anker MD, Arrowsmith M, Hill MS, Kociok-Köhn G, Liptrot DJ, Mahon MF. Magnesium-catalysed nitrile hydroboration. Chem Sci 2015; 7:628-641. [PMID: 29896350 PMCID: PMC5952893 DOI: 10.1039/c5sc03114a] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/19/2015] [Indexed: 01/17/2023] Open
Abstract
A β-diketiminato n-butylmagnesium complex is presented as a selective precatalyst for the reductive hydroboration of organic nitriles with pinacolborane (HBpin).
A β-diketiminato n-butylmagnesium complex is presented as a selective precatalyst for the reductive hydroboration of organic nitriles with pinacolborane (HBpin). Stoichiometric reactivity studies indicate that catalytic turnover ensues through the generation of magnesium aldimido, aldimidoborate and borylamido intermediates, which are formed in a sequence of intramolecular nitrile insertion and inter- and intramolecular B–H metathesis events. Kinetic studies highlight variations in mechanism for the catalytic dihydroboration of alkyl nitriles, aryl nitriles bearing electron withdrawing (Ar(EWG)CN) and aryl nitriles bearing electron donating (Ar(EDG)CN) substitution patterns. Kinetic isotope effects (KIEs) for catalysis performed with DBpin indicate that B–H bond breaking and C–H bond forming reactions are involved in the rate determining processes during the dihydroboration of alkyl nitriles and Ar(EDG)CN substrates, which display divergent first and second order rate dependences on [HBpin] respectively. In contrast, the hydroboration of Ar(EWG)CN substrates provides no KIE and HBpin is not implicated in the rate determining process during catalysis. Irrespective of these differences, a common mechanism is proposed in which the rate determining steps are deduced to vary through the establishment of several pre-equilibria, the relative positions of which are determined by the respective stabilities of the dimeric and monomeric magnesium aldimide and magnesium aldimidoborate intermediates as a result of adjustments to the basicity of the nitrile substrate. More generally, these observations indicate that homogeneous processes performed under heavier alkaline earth catalysis are likely to demonstrate previously unappreciated mechanistic diversity.
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Affiliation(s)
- Catherine Weetman
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
| | - Mathew D Anker
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
| | - Merle Arrowsmith
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
| | - Michael S Hill
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
| | - Gabriele Kociok-Köhn
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
| | - David J Liptrot
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
| | - Mary F Mahon
- Department of Chemistry , University of Bath , Claverton Down , Bath , BA2 7AY , UK .
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83
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Liptrot DJ, Arrowsmith M, Colebatch AL, Hadlington TJ, Hill MS, Kociok-Köhn G, Mahon MF. Beyond Dehydrocoupling: Group 2 Mediated Boron-Nitrogen Desilacoupling. Angew Chem Int Ed Engl 2015; 54:15280-3. [DOI: 10.1002/anie.201507004] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 09/13/2015] [Indexed: 11/09/2022]
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84
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Liptrot DJ, Arrowsmith M, Colebatch AL, Hadlington TJ, Hill MS, Kociok-Köhn G, Mahon MF. Beyond Dehydrocoupling: Group 2 Mediated Boron-Nitrogen Desilacoupling. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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85
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Eller JJ, Downey K. Computational assessment of electron density in metallo-organic nickel pincer complexes for formation of PC bonds. J Comput Chem 2015; 36:1947-53. [PMID: 26306789 DOI: 10.1002/jcc.24034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 04/22/2015] [Accepted: 06/07/2015] [Indexed: 01/15/2023]
Abstract
Hydrophosphination is an atomically efficient method for introducing new carbon-phosphorous bonds in organic synthesis. New late-transition metal catalytic complexes are proposed to facilitate this process. These nickel-based complexes are analyzed using semiempirical (SE), Hartree-Fock (H-F), and density functional theory (DFT) models. H-F proves to be ineffective, while the SE approach has limited, qualitative use. DFT shows electron density at the metal center suitable for catalyzing bond formation in the proposed, reductive hydrophosphination mechanism. It also shows that the pincer complexes under investigation are relatively insensitive to solvent dielectric constant and to the chemical character of the monodentate ligand, both in terms of electron distribution and in terms of molecular orbital energies.
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Affiliation(s)
- Joshua J Eller
- Department of Chemistry, State University of New York College at Cortland, Cortland, New York, 13045
| | - Karen Downey
- Department of Chemistry, State University of New York College at Cortland, Cortland, New York, 13045
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86
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Abstract
Reaction between a β-diketiminato magnesium hydride and carbon monoxide results in the isolation of a dimeric cis-enediolate species through the reductive coupling of two CO molecules. Under catalytic conditions with PhSiH3, an observable magnesium formyl species may be intercepted for the mild reductive cleavage of the CO triple bond.
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Affiliation(s)
- Mathew D Anker
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
| | - Michael S Hill
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK).
| | - John P Lowe
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
| | - Mary F Mahon
- Department of Chemistry, University of Bath, Bath BA2 7AY (UK)
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87
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Coles MP. The role of the bis-trimethylsilylamido ligand, [N{SiMe3}2]−, in main group chemistry. Part 1: Structural chemistry of the s-block elements. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.01.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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88
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Anker MD, Hill MS, Lowe JP, Mahon MF. Alkaline-Earth-Promoted CO Homologation and Reductive Catalysis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505851] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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89
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Younis FM, Krieck S, Görls H, Westerhausen M. s-Block-Metal-Mediated Hydroamination of Diphenylbutadiyne with Primary Arylamines Using a Dipotassium Tetrakis(amino)calciate Precatalyst. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00449] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fadi M. Younis
- Institute of Inorganic and
Analytical Chemistry, Friedrich-Schiller-University, Humboldtstraße 8, D-07743 Jena, Germany
| | - Sven Krieck
- Institute of Inorganic and
Analytical Chemistry, Friedrich-Schiller-University, Humboldtstraße 8, D-07743 Jena, Germany
| | - Helmar Görls
- Institute of Inorganic and
Analytical Chemistry, Friedrich-Schiller-University, Humboldtstraße 8, D-07743 Jena, Germany
| | - Matthias Westerhausen
- Institute of Inorganic and
Analytical Chemistry, Friedrich-Schiller-University, Humboldtstraße 8, D-07743 Jena, Germany
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90
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Intemann J, Bauer H, Pahl J, Maron L, Harder S. Calcium Hydride Catalyzed Highly 1,2‐Selective Pyridine Hydrosilylation. Chemistry 2015; 21:11452-61. [DOI: 10.1002/chem.201501072] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Julia Intemann
- Stratingh Institute for Chemistry, Nijenborgh 4, 9747AG Groningen (The Netherlands)
| | - Heiko Bauer
- Friedrich‐Alexander University Erlangen‐Nürnberg, Inorganic and Organometallic Chemistry, Egerlandstraße 1, 91058 Erlangen (Germany)
| | - Jürgen Pahl
- Friedrich‐Alexander University Erlangen‐Nürnberg, Inorganic and Organometallic Chemistry, Egerlandstraße 1, 91058 Erlangen (Germany)
| | - Laurent Maron
- Université de Toulouse et CNRS INSA, UPS, CNRS, UMR 5215, LPCNO, 135 avenue de Rangueil, 31077 Toulouse (France)
| | - Sjoerd Harder
- Friedrich‐Alexander University Erlangen‐Nürnberg, Inorganic and Organometallic Chemistry, Egerlandstraße 1, 91058 Erlangen (Germany)
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91
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Arrowsmith M, Hill MS, Kociok-Köhn G. Group 2 Catalysis for the Atom-Efficient Synthesis of Imidazolidine and Thiazolidine Derivatives. Chemistry 2015; 21:10548-57. [DOI: 10.1002/chem.201501328] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Indexed: 11/07/2022]
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92
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Lippur K, Kaabel S, Järving I, Rissanen K, Kanger T. CaCl2, Bisoxazoline, and Malonate: A Protocol for an Asymmetric Michael Reaction. J Org Chem 2015; 80:6336-41. [PMID: 26035234 DOI: 10.1021/acs.joc.5b00769] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A mild protocol for the asymmetric Michael addition of dimethyl malonate to various α,β-unsaturated carbonyl compounds was developed. The salient feature of this methodology is that a cheap and environmentally friendly Lewis acid, CaCl2, was used as a catalyst. An aminoindanol- and pyridine-derived ligand provided in the presence of CaCl2 Michael adducts in moderate to high enantioselectivities. The scope of the reaction was demonstrated.
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Affiliation(s)
- Kristin Lippur
- †Department of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Sandra Kaabel
- †Department of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia.,‡Department of Chemistry, Nanoscience Center, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyvaskyla, Finland
| | - Ivar Järving
- †Department of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Kari Rissanen
- ‡Department of Chemistry, Nanoscience Center, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyvaskyla, Finland
| | - Tõnis Kanger
- †Department of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
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93
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Bulky guanidinate stabilized homoleptic magnesium, calcium and zinc complexes and their catalytic activity in the Tishchenko reaction. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.02.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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94
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Arrowsmith M, Hill MS, Johnson AL, Kociok-Köhn G, Mahon MF. Attenuated Organomagnesium Activation of White Phosphorus. Angew Chem Int Ed Engl 2015; 54:7882-5. [PMID: 26014162 PMCID: PMC4648029 DOI: 10.1002/anie.201503065] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 04/24/2015] [Indexed: 11/22/2022]
Abstract
Sequential reactions between a 2,6-diisopropylphenyl-substituted β-diketiminato magnesium n-butyl derivative and P4 allow the highly discriminating synthesis of unusual [nBu2P4]2− and [nBu2P8]2− cluster dianions.
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Affiliation(s)
- Merle Arrowsmith
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY (UK)
| | - Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY (UK).
| | - Andrew L Johnson
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY (UK)
| | | | - Mary F Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY (UK)
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95
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Arrowsmith M, Hill MS, Johnson AL, Kociok-Köhn G, Mahon MF. Attenuated Organomagnesium Activation of White Phosphorus. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503065] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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96
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Schwamm RJ, Day BM, Mansfield NE, Knowelden W, Hitchcock PB, Coles MP. Catalytic bond forming reactions promoted by amidinate, guanidinate and phosphaguanidinate compounds of magnesium. Dalton Trans 2015; 43:14302-14. [PMID: 24852040 DOI: 10.1039/c4dt01097c] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The synthesis and catalytic properties of a series of magnesium compounds consisting of monoanionic, N,N'-chelating ligands (N∩N = amidinates, guanidinates, phosphaguanidinates) is reported. The compounds were synthesized by (i) insertion of a carbodiimide into an existing Mg-C or Mg-N bond, or (ii) protonolysis of an organomagnesium compound by a neutral pre-ligand. Structural analyses of mono- or bis-(chelate) compounds with general formula Mg(N∩N)X(L)n and Mg(N∩N)2(L)n (X = halide, aryloxide, amide; L = Et2O, THF; n = 0, 1 or 2) have been performed and the influence that the ligand substituent patterns have on the solid-state structures has been probed. Selected examples of the compounds were tested as (pre)catalysts for the polymerization of lactide, the dimerization of aldehydes and the hydroacetylenation of carbodiimides.
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Affiliation(s)
- Ryan J Schwamm
- School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, 6012, New Zealand.
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97
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Arrowsmith M, Crimmin MR, Hill MS, Lomas SL, Heng MS, Hitchcock PB, Kociok-Köhn G. Catalytic hydroacetylenation of carbodiimides with homoleptic alkaline earth hexamethyldisilazides. Dalton Trans 2015; 43:14249-56. [PMID: 24434957 DOI: 10.1039/c3dt53542h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The homoleptic alkaline earth hexamethyldisilazides, [M{N(SiMe3)2}2(THF)2] (M = Mg 1a; Ca 1b; Sr 1c), have been shown to act as efficient precatalysts for the hydroacetylenation of organic carbodiimides with alkyl- and arylacetylenes. Catalytic activity was observed to increase with the size of the group 2 metal centre employed and to be strongly influenced by the steric properties of the carbodiimide substrate. The intermediate dimeric calcium and strontium bis(amidinate) complexes, [{PhC≡CC(N(i)Pr)2}2M]2 (M = Ca 2b, Sr 2c), have been isolated and crystallographically characterised. Kinetic studies using the strontium precursor, 1c, provided a reaction rate law independent of [acetylene] but proportional to [carbodiimide](2) and inversely proportional to the concentration of the amidine product in solution.
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Affiliation(s)
- Merle Arrowsmith
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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98
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Sarazin Y, Carpentier JF. Discrete Cationic Complexes for Ring-Opening Polymerization Catalysis of Cyclic Esters and Epoxides. Chem Rev 2015; 115:3564-614. [DOI: 10.1021/acs.chemrev.5b00033] [Citation(s) in RCA: 211] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yann Sarazin
- Institut des Sciences Chimiques
de Rennes, Organometallics, Materials and Catalysis Laboratories,
UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
| | - Jean-François Carpentier
- Institut des Sciences Chimiques
de Rennes, Organometallics, Materials and Catalysis Laboratories,
UMR 6226 CNRS, Université de Rennes 1, Campus de Beaulieu, F-35042 Rennes Cedex, France
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99
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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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100
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Wei B, Li H, Zhang WX, Xi Z. Synthesis, Structural Characterization, and Reactivity of a Fluorene-Based Calcium Oxycyclopentadienide Complex. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00059] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Baosheng Wei
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Heng Li
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Wen-Xiong Zhang
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Zhenfeng Xi
- Beijing
National Laboratory for Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry (SIOC), Chinese Academy of Sciences, Shanghai 200032, China
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