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Zhang Y, Wu B, Zhong M, Zhang WX, Xi Z. Cyclic Bis-alkylidene Complexes of Titanium and Zirconium: Synthesis, Characterization, and Reaction. Chemistry 2020; 26:16472-16479. [PMID: 32875626 DOI: 10.1002/chem.202003240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/29/2020] [Indexed: 11/06/2022]
Abstract
Transition-metal alkylidenes have exhibited wide applications in organometallic chemistry and synthetic organic chemistry, however, cyclic Schrock-carbene-like bis-alkylidenes of group 4 metals with a four-electron donor from an alkylidene have not been reported. Herein, the synthesis and characterization of five-membered cyclic bis-alkylidenes of titanium (4 a,b) and zirconium (5 a,b) are reported, as the first well-defined group 4 metallacyclopentatrienes, by two-electron reduction of their corresponding titana- and zirconacyclopentadienes. DFT analyses of 4 a show a four-electron donor (σ-donation and π-donation) from an alkylidene carbon to the metal center. The reaction of 4 a with N,N'-diisopropylcarbodiimide (DIC) leads to the [2+2]-cycloaddition product 6. Compound 4 a reacted with CO, affording the oxycyclopentadienyl titanium complex 7. These reactivities demonstrate the multiple metal-carbon bond character. The reactions of 4 a or 5 a with cyclooctatetraene (COT) or azobenzene afforded sandwich titanium complex 8 or diphenylhydrazine-coordinated zirconacyclopentadiene 9, respectively, which exhibit two-electron reductive ability.
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Affiliation(s)
- Yongliang 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, P.R. China
| | - Botao Wu
- 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, P.R. China
| | - Mingdong Zhong
- 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, P.R. 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, P.R. 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, P.R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai, 200032, P.R. China
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Carbene complex formation versus cyclometallation from a phosphoryl-tethered methanide ruthenium complex. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Chan EJ, Harrowfield JM, Skelton BW, White AH. X-Ray Structural Studies of Small-Bite Ligands on Large Cations – Lanthanide(III) Ions and Dimethylphosphate. Aust J Chem 2020. [DOI: 10.1071/ch19506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Reactions of lanthanide chlorides or trifluoracetates (tfa) or picrates with trimethylphosphate alone in the first two cases or trimethylphosphate plus 1,10-phenanthroline or 2,2′;6′,2′′-terpyridine in the third, result in the formation of crystalline products containing dimethylphosphate (dmp–). Single crystal X-ray structural characterisation of these materials has shown that the stoichiometrically simple Ln(dmp)3 species obtained with chloride reactants and the lighter lanthanides are polymeric and commonly dimorphic, while the stoichiometrically more variable mixed dmp/tfa complexes have structures closely related to one phase of the Ln(dmp)3 family, and the presence of picrate and aza-aromatic ligands enables the isolation of Y and Lu derivatives containing binuclear species. In all, the dmp– ligands adopt exclusively the κ1O;κ1O′ bridging mode, the overall results indicating that this should apply to the complete lanthanide series.
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Fustier-Boutignon M, Nebra N, Mézailles N. Geminal Dianions Stabilized by Main Group Elements. Chem Rev 2019; 119:8555-8700. [PMID: 31194516 DOI: 10.1021/acs.chemrev.8b00802] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
This review is dedicated to the chemistry of stable and isolable species that bear two lone pairs at the same C center, i.e., geminal dianions, stabilized by main group elements. Three cases can thus be considered: the geminal-dilithio derivative, for which the two substituents at C are neutral, the yldiide derivatives, for which one substituent is neutral while the other is charged, and finally the geminal bisylides, for which the two substituents are positively charged. In this review, the syntheses and electronic structures of the geminal dianions are presented, followed by the studies dedicated to their reactivity toward organic substrates and finally to their coordination chemistry and applications.
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Affiliation(s)
- Marie Fustier-Boutignon
- UPS, CNRS, LHFA UMR 5069 , Université de Toulouse , 118 Route de Narbonne , 31062 Toulouse , France
| | - Noel Nebra
- UPS, CNRS, LHFA UMR 5069 , Université de Toulouse , 118 Route de Narbonne , 31062 Toulouse , France
| | - Nicolas Mézailles
- UPS, CNRS, LHFA UMR 5069 , Université de Toulouse , 118 Route de Narbonne , 31062 Toulouse , France
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Guang J, Liu QP, Hopson R, Williard PG. Lithium pinacolone enolate solvated by hexamethylphosphoramide. J Am Chem Soc 2015; 137:7347-56. [PMID: 25933508 DOI: 10.1021/jacs.5b01906] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the crystal structure of a substoichiometric, HMPA-trisolvated lithium pinacolone enolate tetramer (LiOPin)4·HMPA3 abbreviated as T3. In this tetramer one HMPA binds to lithium more strongly than the other two causing a reduction in spatial symmetry with corresponding loss of C3 symmetry. A variety of NMR experiments, including HMPA titration, diffusion coefficient-formula weight (D-FW) analysis, and other multinuclear one- and two-dimensional NMR techniques reveal that T3 is the major species in hydrocarbon solution when more than 0.6 equiv of HMPA is present. Due to a small amount of moisture from HMPA or air leaking into the solution, a minor complex was identified and confirmed by X-ray diffraction analysis as a mixed aggregate containing enolate, lithium hydroxide, and HMPA in a 4:2:4 ratio, [(LiOPin)4·(LiOH)2·HMPA4], that we refer to as pseudo-T4. A tetra-HMPA-solvated lithium cyclopentanone enolate tetramer was also prepared and characterized by X-ray diffraction, leading to the conclusion that steric effects dominate the formation and solvation of the pinacolone aggregates. An unusual mixed aggregate consisting of pinacolone enolate, lithium diisopropyl amide, lithium oxide, and HMPA in the ratio 5:1:1:2 is also described.
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Affiliation(s)
- Jie Guang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Qiyong Peter Liu
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Russell Hopson
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Paul G Williard
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
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Lafage M, Heuclin H, Le Goff XF, Saffon-Merceron N, Mézailles N. Phosphorus-Stabilized Titanium Carbene Complexes: Synthesis, Reactivity and DFT Studies. Chemistry 2014; 20:16995-7003. [DOI: 10.1002/chem.201403708] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Indexed: 11/10/2022]
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7
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Organotitanium phosphates with free P–OH groups: Synthesis, spectroscopy and solid state structures. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.07.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Stable Geminal Dianions as Precursors for Gem-Diorganometallic and Carbene Complexes. TOP ORGANOMETAL CHEM 2014. [DOI: 10.1007/3418_2014_74] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Chen Y, Trzop E, Makal A, Sokolow JD, Coppens P. Nanosized Alkali-Metal-Doped Ethoxotitanate Clusters. Inorg Chem 2013; 52:4750-2. [DOI: 10.1021/ic302692d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yang Chen
- Chemistry
Department, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States
| | - Elzbieta Trzop
- Chemistry
Department, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States
| | - Anna Makal
- Chemistry
Department, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States
| | - Jesse D. Sokolow
- Chemistry
Department, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States
| | - Philip Coppens
- Chemistry
Department, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States
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Murugavel R, Kuppuswamy S. Organic-Soluble Tri-, Tetra-, and Pentanuclear Titanium(IV) Phosphates. Inorg Chem 2008; 47:7686-94. [DOI: 10.1021/ic800675n] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ramaswamy Murugavel
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Powai, Mumbai-400076, India
| | - Subramaniam Kuppuswamy
- Department of Chemistry and Centre for Research in Nanotechnology and Science, Indian Institute of Technology-Bombay, Powai, Mumbai-400076, India
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Murugavel R, Choudhury A, Walawalkar MG, Pothiraja R, Rao CNR. Metal Complexes of Organophosphate Esters and Open-Framework Metal Phosphates: Synthesis, Structure, Transformations, and Applications. Chem Rev 2008; 108:3549-655. [DOI: 10.1021/cr000119q] [Citation(s) in RCA: 278] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- R. Murugavel
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - Amitava Choudhury
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - M. G. Walawalkar
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - R. Pothiraja
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
| | - C. N. R. Rao
- Department of Chemistry, IIT-Bombay, Powai, Mumbai-400076, India, and Chemistry and Physics of Materials Unit, Jawaharlal Nehru Center of Advanced Scientific Research, Jakkur P.O., Bangalore-560 064, India
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Hamada A, Braunstein P. Lithium−Palladium Complex Supported by Phosphonatophosphine and Chloride Ligands. Inorg Chem 2008; 47:3934-6. [DOI: 10.1021/ic800355m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adel Hamada
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université Louis Pasteur, 4 rue Blaise Pascal, F-67070 Strasbourg Cédex, France
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université Louis Pasteur, 4 rue Blaise Pascal, F-67070 Strasbourg Cédex, France
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13
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Cantat T, Mézailles N, Auffrant A, Le Floch P. Bis-phosphorus stabilised carbene complexes. Dalton Trans 2008:1957-72. [DOI: 10.1039/b717600g] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lebel H, Parmentier M. Copper-Catalyzed Methylenation Reaction: Total Synthesis of (+)-Desoxygaliellalactone. Org Lett 2007; 9:3563-6. [PMID: 17665920 DOI: 10.1021/ol071391q] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The enantioselective total synthesis of (+)-desoxygaliellalactone was achieved in six steps starting from 4-tert-butyldimethylsilyloxybutanal. This synthesis featured a one-pot copper-catalyzed methylenation-Diels-Alder cyclization. The challenging methylenation of aldehyde 4 was studied under various reaction conditions. Whereas Wittig reaction conditions led to byproducts resulting from decomposition of the sensitive butenolide moiety, the mild copper-catalyzed methylenation reaction produced the desired triene in good yield.
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Affiliation(s)
- Hélène Lebel
- Département de chimie, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Québec, Canada H3C 3J7.
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Cantat T, Ricard L, Le Floch P, Mézailles N. Phosphorus-Stabilized Geminal Dianions. Organometallics 2006. [DOI: 10.1021/om060450l] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thibault Cantat
- Département de Chimie, Ecole Polytechnique Laboratoire “Hétéroéléments et Coordination”, UMR CNRS 7653 (DCPH), 91128 Palaiseau Cédex, France
| | - Louis Ricard
- Département de Chimie, Ecole Polytechnique Laboratoire “Hétéroéléments et Coordination”, UMR CNRS 7653 (DCPH), 91128 Palaiseau Cédex, France
| | - Pascal Le Floch
- Département de Chimie, Ecole Polytechnique Laboratoire “Hétéroéléments et Coordination”, UMR CNRS 7653 (DCPH), 91128 Palaiseau Cédex, France
| | - Nicolas Mézailles
- Département de Chimie, Ecole Polytechnique Laboratoire “Hétéroéléments et Coordination”, UMR CNRS 7653 (DCPH), 91128 Palaiseau Cédex, France
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