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Carmona D, Lamata P, Sánchez A, Pardo P, Rodríguez R, Ramírez P, Lahoz FJ, García-Orduña P, Oro LA. Hydroxymethylpyridine containing half-sandwich complexes of Rh(iii), Ir(iii) or Ru(ii). Dalton Trans 2014; 43:15546-59. [DOI: 10.1039/c4dt02171a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ortuño MA, Castro L, Bühl M. Computational Insight into 103Rh Chemical Shift–Structure Correlations in Rhodium Bis(phosphine) Complexes. Organometallics 2013. [DOI: 10.1021/om400774y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Manuel A. Ortuño
- Unitat
de Química Física, Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
| | - Ludovic Castro
- School
of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY10
9ST, U.K
| | - Michael Bühl
- School
of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife KY10
9ST, U.K
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Roth T, Wadepohl H, Wright DS, Gade LH. Chiral ditopic cyclophosphazane (CycloP) ligands: synthesis, coordination chemistry, and application in asymmetric catalysis. Chemistry 2013; 19:13823-37. [PMID: 24038171 DOI: 10.1002/chem.201302327] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Indexed: 11/10/2022]
Abstract
A series of dichlorocyclophosphazanes [{ClP(μ-NR)}2 ] containing chiral and achiral R groups was obtained from simple commercially available amines and PCl3 . Their condensation reactions with axially chiral biaryl diols yielded ansa-bridged chiral cyclophosphazane (CycloP) ligands. This highly modular methodology allows extensive elaboration of the ligand set, in which the chirality can be introduced at the diol bridge and/or the amido R group. This provides the possibility to observe match and mismatch effects in catalysis. A series of twenty CycloP ligands was synthesized and characterized by multinuclear NMR spectroscopy, HRMS, elemental analysis, and in selected cases, single-crystal X-ray diffraction. These studies show that all of the ditopic CycloP ligands are C2 symmetric, rendering their metal coordination sites symmetry equivalent. Two well-established enantioselective reactions were explored by using late-transition metal CycloP complexes as catalysts; the gold-catalyzed hydroamination of γ-allenyl sulfonamides and the asymmetric nickel-catalyzed three-component coupling of a diene and an aldehyde. The steric demands of the CycloP ligands have a subtle influence on the reactivity and selectivity observed in both reactions. Good enantiomeric ratios (e.r.) as high as 89:11 in the gold-catalyzed reaction and 92:8 in the nickel-catalyzed bis-homoallylation reaction were observed.
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Affiliation(s)
- Torsten Roth
- Anorganisch Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49) 6221-54-5609
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Barquín M, Ciganda R, Garralda MA, Ibarlucea L, Mendicute‐Fierro C, Rodríguez‐Diéguez A, Seco JM. Iridium and Rhodium Complexes with the Hemilabile Ligand [2‐(1,3‐Dioxolane‐2‐yl)phenyl]diphenylphosphane – Behaviour in Solution and Structural Characterization. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201201188] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Montserrat Barquín
- Facultad de Química de San Sebastián, Universidad del País Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain, http://www.ehu.es
| | - Roberto Ciganda
- Facultad de Química de San Sebastián, Universidad del País Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain, http://www.ehu.es
| | - María A. Garralda
- Facultad de Química de San Sebastián, Universidad del País Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain, http://www.ehu.es
| | - Lourdes Ibarlucea
- Facultad de Química de San Sebastián, Universidad del País Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain, http://www.ehu.es
| | - Claudio Mendicute‐Fierro
- Facultad de Química de San Sebastián, Universidad del País Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain, http://www.ehu.es
| | | | - José M. Seco
- Facultad de Química de San Sebastián, Universidad del País Vasco, UPV/EHU, Apdo. 1072, 20080 San Sebastián, Spain, http://www.ehu.es
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Fabrello A, Dinoi C, Perrin L, Kalck P, Maron L, Urrutigoity M, Dechy-Cabaret O. Probing the stereo-electronic properties of cationic rhodium complexes bearing chiral diphosphine ligands by 103Rh NMR. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48:848-856. [PMID: 20845501 DOI: 10.1002/mrc.2677] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
(103)Rh NMR represents a powerful tool to assess the global electronic and steric contribution of diphosphine ligands on [Rh(COD)(diphosphine)](+) complexes. In the case of DIOP, BINAP and MeDUPHOS, this approach proved to be more informative than classical CO-stretching frequency measurements. After validation, this method has been extended to a set of seven diphosphines. (103)Rh NMR measurements on [Rh(COD)(diphosphine)]PF(6) lead to the following order of donor properties: dppe > MeBPE > MeDUPHOS > dppb > DIOP > BINAP > Tol-BINAP. This trend has been validated by DFT in the case of DIOP, BINAP and MeDUPHOS. In conjunction, (31)P NMR chemical shift has been shown to reflect the ring constraints of the Rh-diphosphine scaffold. This contribution is a step towards a mechanistic investigation of the catalytic hydrogenation of unsaturated substrates by (103)Rh NMR and DFT.
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Affiliation(s)
- Amandine Fabrello
- CNRS, Laboratoire de Chimie de Coordination, 205, route de Narbonne, F-31077 Toulouse, France
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De Crisci AG, Annibale VT, Hamer GK, Lough AJ, Fekl U. Characterization of a rhodium-sparteine complex, [((−)-sparteine)Rh(η4-COD)]+: Crystal structure and DNMR/DFT studies on ligand-rotation dynamics. Dalton Trans 2010; 39:2888-902. [DOI: 10.1039/b917487g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dalton DM, Oberg KM, Yu RT, Lee EE, Perreault S, Oinen ME, Pease ML, Malik G, Rovis T. Enantioselective rhodium-catalyzed [2 + 2 + 2] cycloadditions of terminal alkynes and alkenyl isocyanates: mechanistic insights lead to a unified model that rationalizes product selectivity. J Am Chem Soc 2009; 131:15717-28. [PMID: 19817441 PMCID: PMC2796191 DOI: 10.1021/ja905065j] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This manuscript describes the development and scope of the asymmetric rhodium-catalyzed [2 + 2 + 2] cycloaddition of terminal alkynes and alkenyl isocyanates leading to the formation of indolizidine and quinolizidine scaffolds. The use of phosphoramidite ligands proved crucial for avoiding competitive terminal alkyne dimerization. Both aliphatic and aromatic terminal alkynes participate well, with product selectivity a function of both the steric and electronic character of the alkyne. Manipulation of the phosphoramidite ligand leads to tuning of enantio- and product selectivity, with a complete turnover in product selectivity seen with aliphatic alkynes when moving from Taddol-based to biphenol-based phosphoramidites. Terminal and 1,1-disubstituted olefins are tolerated with nearly equal efficacy. Examination of a series of competition experiments in combination with analysis of reaction outcome shed considerable light on the operative catalytic cycle. Through a detailed study of a series of X-ray structures of rhodium(cod)chloride/phosphoramidite complexes, we have formulated a mechanistic hypothesis that rationalizes the observed product selectivity.
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Affiliation(s)
- Derek M. Dalton
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Kevin M. Oberg
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Robert T. Yu
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Ernest E. Lee
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Stéphane Perreault
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Mark Emil Oinen
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Melissa L. Pease
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Guillaume Malik
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
| | - Tomislav Rovis
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523
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Brück A, Ruhland K. Investigation of the Dynamic Solution Behavior of Chloro(diene)rhodium(I) Phosphine Complexes with a Pendant Unsaturated Heterocycle at Phosphorus (2-pyridyl, 2-imidazyl; diene = COD, NBD). Organometallics 2009. [DOI: 10.1021/om900324a] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andreas Brück
- Lehrstuhl für Chemische Physik und Materialwissenschaften, Institut für Physik, Universität Augsburg, Universitätsstrasse 1, D-86159 Augsburg, Germany
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching bei München, Germany
| | - Klaus Ruhland
- Lehrstuhl für Chemische Physik und Materialwissenschaften, Institut für Physik, Universität Augsburg, Universitätsstrasse 1, D-86159 Augsburg, Germany
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching bei München, Germany
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