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Kumar R, Dohi T, Zhdankin VV. Organohypervalent heterocycles. Chem Soc Rev 2024; 53:4786-4827. [PMID: 38545658 DOI: 10.1039/d2cs01055k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
This review summarizes the structural and synthetic aspects of heterocyclic molecules incorporating an atom of a hypervalent main-group element. The term "hypervalent" has been suggested for derivatives of main-group elements with more than eight valence electrons, and the concept of hypervalency is commonly used despite some criticism from theoretical chemists. The significantly higher thermal stability of hypervalent heterocycles compared to their acyclic analogs adds special features to their chemistry, particularly for bromine and iodine. Heterocyclic compounds of elements with double bonds are not categorized as hypervalent molecules owing to the zwitterionic nature of these bonds, resulting in the conventional 8-electron species. This review is focused on hypervalent heterocyclic derivatives of nonmetal main-group elements, such as boron, silicon, nitrogen, carbon, phosphorus, sulfur, selenium, bromine, chlorine, iodine(III) and iodine(V).
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Affiliation(s)
- Ravi Kumar
- Department of Chemistry, J C Bose University of Science and Technology, YMCA, NH-2, Sector-6, Mathura Road, Faridabad, 121006, Haryana, India.
| | - Toshifumi Dohi
- Graduate School of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan.
| | - Viktor V Zhdankin
- Department of Chemistry and Biochemistry, 1038 University Drive, 126 HCAMS University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
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2
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Budeev A, Dong J, Häussinger D, Sparr C. Catalyst control over pentavalent stereocentres. Nat Commun 2023; 14:8013. [PMID: 38049395 PMCID: PMC10696079 DOI: 10.1038/s41467-023-43750-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 11/17/2023] [Indexed: 12/06/2023] Open
Abstract
A monumental diversity of catalytic methods imparts the ability to select one of two configurations of tetravalent stereocentres. Conversely, catalyst control over pentavalent stereocentres, where a fifth moiety bound to the central atom encodes an expanded stereochemical space, remained a challenge to be accomplished. Herein, we report the feasibility of the catalytic tractability of pentavalent stereocentres. A bifunctional iminophosphorane thiourea catalyst enables enantio- and diastereocontrol over pentavalent phosphoranes to differentiate configurationally stable enantiomers and ensembles of diastereomers which emerge together from a single stereocentre. The desired dioxophosphorane stereoisomers are obtained with excellent yield and selectivity (up to 99% yield, 96:4 e.r. and 99:1 d.r.), while stereodivergent catalysis reroutes the reaction for selective access to each of the viable stereoisomeric states of pentavalent phosphoranes. Considering the diversity of high-valent main group species, it is expected that catalyst control over pentavalent stereocentres significantly increases the synthetically addressable stereochemical space.
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Affiliation(s)
- Anton Budeev
- Department of Chemistry, University of Basel, Basel, Switzerland
| | - Jianyang Dong
- Department of Chemistry, University of Basel, Basel, Switzerland
| | | | - Christof Sparr
- Department of Chemistry, University of Basel, Basel, Switzerland.
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3
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Jiang XD, Toya Y, Matsukawa S, Kojima S, Jimenez-Halla JOC, Shang R, Nakamoto M, Yamamoto Y. Synthesis and characterization of a pair of O- fac/O- mer 12-P-6 alkyloxaphosphates with a P-O-C-C four-membered ring. Chem Sci 2019; 10:3466-3472. [PMID: 30996936 PMCID: PMC6432329 DOI: 10.1039/c8sc05158e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/15/2019] [Indexed: 11/21/2022] Open
Abstract
The synthesis and characterization of a stereoisomer pair of 12-P-6 alkyloxaphosphates synthesised from pentacoordinate phosphoranes.
Structurally characterized hexacoordinate organophosphorus compounds remain rare due to their highly reactive nature and thermal instability. Herein we report the first synthesis of a pair of O-facial and O-meridional hexacoordinate oxaphosphates (5B and 5D) obtained from the O-apical and O-equatorial β-hydroxyalkylphosphoranes 3 and 4. This was achieved by using the bulky C2F5-groups on the ortho-substituted aryl backbone. Calculations of the relative energies of possible isomers indicate 5B and 5D are thermodynamic products. Although the mechanisms of their formation and the determining factor of stereo-selectivity are still unclear, their isolation and structure conformation contributes to a formulation of a viable strategy for diastereoselective synthesis of heteroleptic hexacoordinate organophosphates.
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Affiliation(s)
- Xin-Dong Jiang
- College of Applied Chemistry , Shenyang University of Chemical Technology , Shenyang , 110142 , China
| | - Yuya Toya
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Shiro Matsukawa
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Satoshi Kojima
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - J Oscar C Jimenez-Halla
- Department of Chemistry , Division of Natural and Exact Sciences , University of Guanajuato , Campus Gto, Noria Alta s/n 36050 , Guanajuato , Mexico
| | - Rong Shang
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Masaaki Nakamoto
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Yohsuke Yamamoto
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
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Hazin K, Patrick BO, Gates DP. Ammonium and Potassium Salts of a Hexacoordinate Phosphorus(V) Anion Featuring P–O and P–C Bonds. Inorg Chem 2018; 58:188-198. [DOI: 10.1021/acs.inorgchem.8b02174] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Khatera Hazin
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Derek P. Gates
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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Abstract
Treating PCl5 with C12H8Li2, generated from either C12H10, C12H8Br2, or C12H8I2, affords three products in different ratios depending on the source of the lithiated biphenyl. Hellwinkel’s salt [P(C12H8)2][P(C12H8)3] ([1][2]) and another product [P(C12H8)(C24H16)][P(C12H8)3] ([1′][2]) were obtained by reacting PCl5 with 2,2′-dilithiobiphenyl [Route A: 2.5 equiv.; obtained from biphenyl, n-BuLi, and TMEDA; Route B: 3.0 equiv.; obtained from 2,2′-diiodobiphenyl and n-BuLi; Route C: 4.0 equiv.; obtained from 2,2′-dibromobiphenyl and n-BuLi]. The synthesis, isolation, and characterization of the chiral spiro-compound [1′][2] and the characterization of the pentavalent phosphorane [P(C12H8)2(C12H9)] (3) are reported. The complex [1′][2] was characterized by 31P{1H} NMR spectroscopy, X-ray crystallography, and mass spectrometry. The pentavalent compound (3) was characterized by 31P{1H} NMR spectroscopy and X-ray crystallography.
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Affiliation(s)
- Khatera Hazin
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Derek P. Gates
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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Uraguchi D, Sasaki H, Kimura Y, Ito T, Ooi T. Molecular Design, Synthesis, and Asymmetric Catalysis of a Hexacoordinated Chiral Phosphate Ion. J Am Chem Soc 2018; 140:2765-2768. [DOI: 10.1021/jacs.7b13433] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daisuke Uraguchi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Hitoshi Sasaki
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Yuto Kimura
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Takaki Ito
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
| | - Takashi Ooi
- Institute
of Transformative Bio-Molecules (WPI-ITbM) and Department of Molecular
and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8601, Japan
- CREST,
Japan Science and Technology Agency (JST), Nagoya University, Nagoya 464-8601, Japan
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Heterocycles Incorporating a Pentacoordinated, Hypervalent Phosphorus Atom. ADVANCES IN HETEROCYCLIC CHEMISTRY 2018. [DOI: 10.1016/bs.aihch.2017.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Hibner-Kulicka P, Joule JA, Skalik J, Bałczewski P. Recent studies of the synthesis, functionalization, optoelectronic properties and applications of dibenzophospholes. RSC Adv 2017. [DOI: 10.1039/c6ra26333j] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The dibenzophospholes, synthesized in the 1950s, have recently gained a greater importance, due to their use in organic electronics and the possibility of designing new π-conjugated, optoelectronic materials that incorporate these heterocycles.
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Affiliation(s)
- Paulina Hibner-Kulicka
- Department of Heteroorganic Chemistry
- Centre of Molecular and Macromolecular Studies
- Polish Academy of Sciences
- 90-363 Łódź
- Poland
| | - John Arthur Joule
- The School of Chemistry
- The University of Manchester
- Manchester M13 9PL
- UK
| | - Joanna Skalik
- Department of Heteroorganic Chemistry
- Centre of Molecular and Macromolecular Studies
- Polish Academy of Sciences
- 90-363 Łódź
- Poland
| | - Piotr Bałczewski
- Department of Heteroorganic Chemistry
- Centre of Molecular and Macromolecular Studies
- Polish Academy of Sciences
- 90-363 Łódź
- Poland
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9
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Chiral Hypervalent, Pentacoordinated Phosphoranes. Molecules 2016; 21:molecules21111573. [PMID: 27879636 PMCID: PMC6274329 DOI: 10.3390/molecules21111573] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/02/2016] [Accepted: 11/16/2016] [Indexed: 11/17/2022] Open
Abstract
This review presents synthetic procedures applied to the preparation of chiral (mainly optically active) pentacoordinated, hypervalent mono and bicyclic phosphoranes. The mechanisms of their stereoisomerization and their selected interconversions are also presented.
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Mironov VF, Dimukhametov MN, Efimov SV, Aminova RM, Karataeva FK, Krivolapov DB, Mironova EV, Klochkov VV. Stereoselective PCO/POC-Rearrangement of P-C-Cage Phosphorane in the Reaction of 4,5-Dimethyl-2-(2-oxo-1,2-diphenyl)ethoxy-1,3,2-dioxaphospholane with Hexafluoroacetone. J Org Chem 2016; 81:5837-50. [PMID: 27258739 DOI: 10.1021/acs.joc.6b00356] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Interaction of 4,5-dimethyl-2-(2-oxo-1,2-diphenyl)ethoxy-1,3,2-dioxaphospholane, bearing a carboxyl group in the γ-position with respect to the phosphorus atom and obtained from d,l-butanediol, with hexafluoroacetone (CCl4, -40 °C) leads to the simultaneous formation of regio- and stereoisomeric cage-like phosphoranes with phosphorus-carbon and phosphorus-oxygen bonds with a high stereoselectivity (>95%), whose structure was determined by 1D and 2D NMR spectroscopy and XRD. When stored as a solution in dichloromethane for one month, the PCO-isomer rearranges into the thermodynamically more stable POC-isomer of the cage-like phosphorane. Mild hydrolysis of the PCO/POC-isomers proceeds with a high chemoselectivity and leads to the formation of P(IV)-dioxaphospholane derivatives. Acidic hydrolysis of the POC-isomer leads to the formation of an oxirane derivative with an unexpectedly high stereoselectivity (>95%). DFT calculations (using the PBE functional) allowed us to obtain structures and energies of the initial phospholane, reaction products (PCO/POC-isomers), and an intermediate P(V)-oxaphosphirane.
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Affiliation(s)
- Vladimir F Mironov
- A.E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences , Arbuzov str. 8, Kazan 420088, Russian Federation
| | - Mudaris N Dimukhametov
- A.E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences , Arbuzov str. 8, Kazan 420088, Russian Federation
| | - Sergey V Efimov
- Institute of Physics, Kazan Federal University , Kremlevskaya str. 18, Kazan 420008, Russian Federation
| | - Roza M Aminova
- Institute of Physics, Kazan Federal University , Kremlevskaya str. 18, Kazan 420008, Russian Federation
| | - Farida Kh Karataeva
- Institute of Physics, Kazan Federal University , Kremlevskaya str. 18, Kazan 420008, Russian Federation
| | - Dmitry B Krivolapov
- A.E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences , Arbuzov str. 8, Kazan 420088, Russian Federation
| | - Ekaterina V Mironova
- A.E. Arbuzov Institute of Organic and Physical Chemistry of the Russian Academy of Sciences , Arbuzov str. 8, Kazan 420088, Russian Federation
| | - Vladimir V Klochkov
- Institute of Physics, Kazan Federal University , Kremlevskaya str. 18, Kazan 420008, Russian Federation
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11
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Brunner H. SYNTHESIS AND RESOLUTION OF ENANTIOMERIC ORGANIC COMPOUNDS OF THE TRANSITION ELEMENTS. Ann N Y Acad Sci 2006. [DOI: 10.1111/j.1749-6632.1974.tb25329.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Hellwinkel D, Lindner W, Wilfinger H. Zur Stabilisierung der trigonal‐bipyramidalen Grundzustände spirocyclischer Pentaorganylphosphorane und ‐arsorane. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19741070504] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dieter Hellwinkel
- Institut für Organische Chemie der Universität Heidelberg, D‐6900 Heidelberg 1, Im Neuenheimer Feld 7
| | - Wolfhard Lindner
- Institut für Organische Chemie der Universität Heidelberg, D‐6900 Heidelberg 1, Im Neuenheimer Feld 7
| | - Hans‐Jörg Wilfinger
- Institut für Organische Chemie der Universität Heidelberg, D‐6900 Heidelberg 1, Im Neuenheimer Feld 7
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13
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Odinets IL, Artyushin OI, Sharova EV, Goryunov EI, Golovanov DG, Lyssenko KA, Petrovskii PV, Mastryukova TA. Generation of an optically active rhodium(III) complex by crystallization-induced spontaneous resolution of a racemic mixture. MENDELEEV COMMUNICATIONS 2003. [DOI: 10.1070/mc2003v013n03abeh001778] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Tomori H, Fox JM, Buchwald SL. An improved synthesis of functionalized biphenyl-based phosphine ligands. J Org Chem 2000; 65:5334-41. [PMID: 10993363 DOI: 10.1021/jo000691h] [Citation(s) in RCA: 188] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Functionalized dicyclohexyl- and di-tert-butylphosphinobiphenyl ligands are prepared by the reaction of arylmagnesium halides with benzyne, followed by the addition of a chlorodialkylphosphine. This one-pot procedure is considerably less expensive and time-consuming than the method used previously to prepare such ligands. The cost of introducing the dicyclohexylphosphine group can be decreased by preparing chlorodicyclohexylphosphine from PCl3 and cyclohexylmagnesium chloride, and using the reagent without further purification. The new method is significant, as a variety of ligands can be produced in useful amounts by a procedure that is simple, with starting materials that are relatively inexpensive, and, in most cases, without chromatographic purification.
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Affiliation(s)
- H Tomori
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge 02139, USA
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Marchi C, Fotiadu F, Buono G. Diastereoselectivity of Borane Addition to Chiral Triquinphosphoranes. NMR, X-ray, and Molecular Modeling Studies. Organometallics 1999. [DOI: 10.1021/om980774c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Caroline Marchi
- Laboratoire de Synthèse Asymétrique, UMR 6516 “Synthèse, Catalyse, et Chiralité”, Ecole Nationale Supérieure de Synthèses, de Procédés et d'Ingénierie Chimiques d'Aix-Marseille, Faculté de Saint-Jérôme, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France
| | - Frédéric Fotiadu
- Laboratoire de Synthèse Asymétrique, UMR 6516 “Synthèse, Catalyse, et Chiralité”, Ecole Nationale Supérieure de Synthèses, de Procédés et d'Ingénierie Chimiques d'Aix-Marseille, Faculté de Saint-Jérôme, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France
| | - Gérard Buono
- Laboratoire de Synthèse Asymétrique, UMR 6516 “Synthèse, Catalyse, et Chiralité”, Ecole Nationale Supérieure de Synthèses, de Procédés et d'Ingénierie Chimiques d'Aix-Marseille, Faculté de Saint-Jérôme, Avenue Escadrille Normandie-Niemen, 13397 Marseille Cedex 20, France
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MeLacour J, Ginglinger C, Grivet C, RaldBernardinelli G. Synthese und Trennung der Enantiomere des konfigurationsstabilen Tris(tetrachlorbenzoldiolato)phosphat(V)-Ions. Angew Chem Int Ed Engl 1997. [DOI: 10.1002/ange.19971090628] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kojima S, Kajiyama K, Akiba KY. Characterization of Enantiomeric Pairs of Optically Active 10-P-5 Phosphoranes with Asymmetry Only at Phosphorus. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.1785] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Kojima S, Kajiyama K, Akiba KY. Characterization of an optically active pentacoordinate phosphorane with asymmetry only at phosphorus. Tetrahedron Lett 1994. [DOI: 10.1016/0040-4039(94)88219-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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21
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Hellwinkel D, Lindner W, Schmidt W. Die Racemisierung spirocyclischer Pentaarylderivate von Elementen der V. Hauptgruppe, I.1H-NMR-Untersuchungen mit sterisch überbesetzten asymmetrischen Phosphoranen, Arsoranen und Stiboranen. ACTA ACUST UNITED AC 1979. [DOI: 10.1002/cber.19791120125] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Klaebe A, Carrelhas A, Brazier JF, Houalla D, Wolf R. MUTAROTATION ARISING FROM STEREOLABILE PENTACOORDINATED PHOSPHORUS. ACTA ACUST UNITED AC 1977. [DOI: 10.1080/03086647708070734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Brunner H, Herrmann WA. Optisch aktive Molybdän- und Wolfram-Komplexe mit tetragonal-pyramidaler Konfiguration. Angew Chem Int Ed Engl 1972. [DOI: 10.1002/ange.19720840918] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Brunner H, Herrmann WA. Optically Active Molybdenum and Tungsten Complexes with Tetragonal-pyramidal Configuration. Angew Chem Int Ed Engl 1972. [DOI: 10.1002/anie.197204181] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hellwinkel D, Knabe B. Eliminierungen und Umlagerungen bei Alkyl- und Alkenyl-bis-2.2′-biphenylylen-arsenen. ACTA ACUST UNITED AC 1971. [DOI: 10.1002/cber.19711040610] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Gleichzeitige stabilisierung einer stickstoff-pyramide und einer trigonalen bipyramide des phosphors. Tetrahedron Lett 1969. [DOI: 10.1016/s0040-4039(00)99780-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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33
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Hellwinkel D. Die Stereochemie organischer Derivate des fünf-und sechsbindigen Phosphors, III. Tris-[4.4′-dimethyl-biphenylen]-phosphate und Bis-[4.4′-dimethyl-biphenylen]-[4.4′-dimethyl-biphenylyl-(2)]-phosphoran. ACTA ACUST UNITED AC 1966. [DOI: 10.1002/cber.19660991133] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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