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Tolpygin AO, Sachkova AA, Mikhailychev AD, Ob'edkov AM, Kovylina TA, Cherkasov AV, Fukin GK, Trifonov AA. Sc and Y bis(alkyl) complexes supported by bidentate and tridentate amidinate ligands. Synthesis, structure and catalytic activity in polymerization of isoprene and 1-heptene. Dalton Trans 2022; 51:7723-7731. [PMID: 35522255 DOI: 10.1039/d2dt00866a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of bis(alkyl) complexes {(tBu)C[N(2,6-Me2C6H3)]2}Ln(CH2SiMe3)2(THF)n (Ln = Y, n = 1 (1); Ln = Sc, n = 1 (2)), {2-[Ph2P(O)]C6H4NC(tBu)N(2,6-Me2C6H3)}Sc(CH2SiMe3)2 (3), {2-[Ph2P(NPh)]C6H4NC(tBu)N(2,6-Me2C6H3)}Sc(CH2SiMe3)2 (4) coordinated by bidentate (N,N) and tridentate (N,N,O; N,N,N) amidinate ligands are synthesized using an alkane elimination approach. Yttrium complex 1 demonstrated a half-life of ∼2.5 days at room temperature in benzene-D6 (C6D6) solution, whereas scandium complexes proved to be much more stable (25 d (2), 30 d (3) and 42 d (4)). Complexes 1-4 as a part of ternary catalytic systems 1-4/TB, HNB/AlR3 (AlR3 = AliBu3, AliBu2H; TB = [Ph3C][B(C6F5)4], HNB = [PhNHMe2][B(C6F5)4]) demonstrated high catalytic activity in isoprene polymerization and enable 80%-100% conversion of 1000 equivalents of monomer into polymer at 25 °C within 3-180 min. The isolated polyisoprenes feature predominantly cis-1,4-regularity (69.2%-87.3%) and polydispersities Mw/Mn = 2.26-8.92. Moreover, the binary (2/TB) and ternary (1-4/TB/10 AliBu3) systems initiate 1-heptene polymerization providing 40%-100% conversion of 500 equivalents of monomer in 24 h at 25 °C giving polymer samples with Mn = 1.55-190.2 × 103 and Mw/Mn = 1.55-3.87.
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Affiliation(s)
- Aleksei O Tolpygin
- Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod, Russia. .,Institute of Organoelement compounds of Russian Academy of Sciences, 28 Vavilova str., 119334, Moscow, Russia
| | - Anastasia A Sachkova
- Lobachevsky State University of Nizhny Novgorod, 23 Prospekt Gagarina, 603022, Nizhny Novgorod, Russia
| | - Alexander D Mikhailychev
- Lobachevsky State University of Nizhny Novgorod, 23 Prospekt Gagarina, 603022, Nizhny Novgorod, Russia
| | - Anatoly M Ob'edkov
- Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod, Russia.
| | - Tatyana A Kovylina
- Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod, Russia.
| | - Anton V Cherkasov
- Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod, Russia.
| | - Georgy K Fukin
- Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod, Russia.
| | - Alexander A Trifonov
- Institute of Organometallic Chemistry of Russian Academy of Sciences, 49 Tropinina str., GSP-445, 603950, Nizhny Novgorod, Russia. .,Institute of Organoelement compounds of Russian Academy of Sciences, 28 Vavilova str., 119334, Moscow, Russia
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2
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Xiong G, Tardif O, Nishiura M, Bingtao G, Hou Z. Synthesis and Structure Diversity of Half‐Sandwich Rare Earth Dialkynyl Complexes. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Gang Xiong
- Advanced Catalysis Research Group RIKEN Center for Sustainable Resource Science 2-1 Hirosawa Wako, Saitama 351-0198 Japan
| | - Olivier Tardif
- Organometallic Chemistry Laboratory RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako, Saitama 351-0198 Japan
| | - Masayoshi Nishiura
- Advanced Catalysis Research Group RIKEN Center for Sustainable Resource Science 2-1 Hirosawa Wako, Saitama 351-0198 Japan
- Organometallic Chemistry Laboratory RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako, Saitama 351-0198 Japan
| | - Guan Bingtao
- Organometallic Chemistry Laboratory RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako, Saitama 351-0198 Japan
| | - Zhaomin Hou
- Advanced Catalysis Research Group RIKEN Center for Sustainable Resource Science 2-1 Hirosawa Wako, Saitama 351-0198 Japan
- Organometallic Chemistry Laboratory RIKEN Cluster for Pioneering Research 2-1 Hirosawa Wako, Saitama 351-0198 Japan
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3
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Synthesis and DFT studies of 1,2-disubstituted benzimidazoles using expeditious and magnetically recoverable CoFe2O4/Cu(OH)2 nanocomposite under solvent-free condition. JOURNAL OF SAUDI CHEMICAL SOCIETY 2021. [DOI: 10.1016/j.jscs.2021.101394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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CoFe2O4/Cu(OH)2 Nanocomposite: Expeditious and magnetically recoverable heterogeneous catalyst for the four component Biginelli/transesterification reaction and their DFT studies. RESULTS IN CHEMISTRY 2021. [DOI: 10.1016/j.rechem.2021.100202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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Yin GW, Yang H, Guo WY, Tang LF. The Sn–C bond reactivity in 1,1-bis(heteroaryl)-2-triorganostannylethanes toward tungsten carbonyl derivatives. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.11.029] [Citation(s) in RCA: 1] [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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Tanaka H, Kuriki H, Kubo T, Osaka I, Yoshida H. Copper-catalyzed arylstannylation of arynes in a sequence. Chem Commun (Camb) 2019; 55:6503-6506. [DOI: 10.1039/c9cc02738f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diverse ortho-stannylbiaryls and teraryls have been synthesized by copper-catalyzed arylstannylation of arynes, in which the single or dual insertion of arynes into arylstannanes is precisely controllable by simply changing the equivalence of the aryne precursors employed.
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Affiliation(s)
- Hideya Tanaka
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Hitoshi Kuriki
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Teruhiko Kubo
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Itaru Osaka
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Hiroto Yoshida
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
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Zhang Q, Tian X, Zhou H, Wu J, Tian Y. Lighting the Way to See Inside Two-Photon Absorption Materials: Structure-Property Relationship and Biological Imaging. MATERIALS (BASEL, SWITZERLAND) 2017; 10:E223. [PMID: 28772584 PMCID: PMC5503390 DOI: 10.3390/ma10030223] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 02/16/2017] [Indexed: 12/11/2022]
Abstract
The application of two-photon absorption (2PA) materials is a classical research field and has recently attracted increasing interest. It has generated a demand for new dyes with high 2PA cross-sections. In this short review, we briefly cover the structure-2PA property relationships of organic fluorophores, organic-inorganic nanohybrids and metal complexes explored by our group. (1) The two-photon absorption cross-section (δ) of organic fluorophores increases with the extent of charge transfer, which is important to optimize the core, donor-acceptor pair, and conjugation-bridge to obtain a large δ value. Among the various cores, triphenylamine appears to be an efficient core. Lengthening of the conjugation with styryl groups in the D-π-D quadrupoles and D-π-A dipoles increased δ over a long wavelength range than when vinylene groups were used. Large values of δ were observed for extended conjugation length and moderate donor-acceptors in the near-IR wavelengths. The δ value of the three-arm octupole is larger than that of the individual arm, if the core has electron accepting groups that allow significant electronic coupling between the arms; (2) Optical functional organic/inorganic hybrid materials usually show high thermal stability and excellent optical activity; therefore the design of functional organic molecules to build functional organic-inorganic hybrids and optimize the 2PA properties are significant. Advances have been made in the design of organic-inorganic nanohybrid materials of different sizes and shapes for 2PA property, which provide useful examples to illustrate the new features of the 2PA response in comparison to the more thoroughly investigated donor-acceptor based organic compounds and inorganic components; (3) Metal complexes are of particular interest for the design of new materials with large 2PA ability. They offer a wide range of metals with different ligands, which can give rise to tunable electronic and 2PA properties. The metal ions, including transition metals and lanthanides, can serve as an important part of the structure to control the intramolecular charge-transfer process that drives the 2PA process. As templates, transition metal ions can assemble simple to more sophisticated ligands in a variety of multipolar arrangements resulting in interesting and tailorable electronic and optical properties, depending on the nature of the metal center and the energetics of the metal-ligand interactions, such as intraligand charge-transfer (ILCT) and metal-ligand charge-transfer (MLCT) processes. Lanthanide complexes are attractive for a number of reasons: (i) their visible emissions are quite long-lived; (ii) their absorption and emission can be tuned with the aid of appropriate photoactive ligands; (iii) the accessible energy-transfer path between the photo-active ligands and the lanthanide ion can facilitate efficient lanthanide-based 2PA properties. Thus, the above materials with excellent 2PA properties should be applied in two-photon applications, especially two-photon fluorescence microscopy (TPFM) and related emission-based applications. Furthermore, the progress of research into the use of those new 2PA materials with moderate 2PA cross section in the near-infrared region, good Materials 2017, 10, 223 2 of 37 biocompatibility, and enhanced two-photon excited fluorescence for two-photon bio-imaging is summarized. In addition, several possible future directions in this field are also discussed (146 references).
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Affiliation(s)
- Qiong Zhang
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province, Department of Chemistry, Anhui University, Hefei 230039, China.
| | - Xiaohe Tian
- School of Life Science, Anhui University, Hefei 230039, China.
| | - Hongping Zhou
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province, Department of Chemistry, Anhui University, Hefei 230039, China.
| | - Jieying Wu
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province, Department of Chemistry, Anhui University, Hefei 230039, China.
| | - Yupeng Tian
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province, Department of Chemistry, Anhui University, Hefei 230039, China.
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Lohr TL, Li Z, Marks TJ. Thermodynamic Strategies for C-O Bond Formation and Cleavage via Tandem Catalysis. Acc Chem Res 2016; 49:824-34. [PMID: 27078085 DOI: 10.1021/acs.accounts.6b00069] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
To reduce global reliance on fossil fuels, new renewable sources of energy that can be used with the current infrastructure are required. Biomass represents a major source of renewable carbon based fuel; however, the high oxygen content (∼40%) limits its use as a conventional fuel. To utilize biomass as an energy source, not only with current infrastructure, but for maximum energy return, the oxygen content must be reduced. One method to achieve this is to develop selective catalytic methods to cleave C-O bonds commonly found in biomass (aliphatic and aromatic ethers and esters) for the eventual removal of oxygen in the form of volatile H2O or carboxylic acids. Once selective methods of C-O cleavage are understood and perfected, application to processing real biomass feedstocks such as lignin can be undertaken. This Laboratory previously reported that recyclable "green" lanthanide triflates are excellent catalysts for C-O bond-forming hydroalkoxylation reactions. Based on the virtues of microscopic reversibility, the same lanthanide triflate catalyst should catalyze the reverse C-O cleavage process, retrohydroalkoxylation, to yield an alcohol and an alkene. However, ether C-O bond-forming (retrohydroalkoxylation) to form an alcohol and alkene is endothermic. Guided by quantum chemical analysis, our strategy is to couple endothermic, in tandem, ether C-O bond cleavage with exothermic alkene hydrogenation, thereby leveraging the combined catalytic cycles thermodynamically to form an overall energetically favorable C-O cleavage reaction. This Account reviews recent developments on thermodynamically leveraged tandem catalysis for ether and more recently, ester C-O bond cleavage undertaken at Northwestern University. First, the fundamentals of lanthanide-catalyzed hydroelementation are reviewed, with particular focus on ether C-O bond formation (hydroalkoxylation). Next, the reverse C-O cleavage/retrohydroalkoxylation processes enabled by tandem catalysis are discussed for both ether and ester C-O bond cleavage, including mechanistic and computational analysis. This is followed by recent results using this tandem catalytic strategy toward biomass relevant substrates, including work deconstructing acetylated lignin models, and the production of biodiesel from triglycerides, while bypassing the production of undesired glycerol for more valuable C3 products such as diesters (precursors to diols) in up to 47% selectivity. This Account concludes with future prospects for using this tandem catalytic system under real biomass processing conditions.
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Affiliation(s)
- Tracy L. Lohr
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Zhi Li
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Tobin J. Marks
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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9
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Hill MS, Liptrot DJ, Weetman C. Alkaline earths as main group reagents in molecular catalysis. Chem Soc Rev 2016; 45:972-88. [PMID: 26797470 DOI: 10.1039/c5cs00880h] [Citation(s) in RCA: 356] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The past decade has witnessed some remarkable advances in our appreciation of the structural and reaction chemistry of the heavier alkaline earth (Ae = Mg, Ca, Sr, Ba) elements. Derived from complexes of these metals in their immutable +2 oxidation state, a broad and widely applicable catalytic chemistry has also emerged, driven by considerations of cost and inherent low toxicity. The considerable adjustments incurred to ionic radius and resultant cation charge density also provide reactivity with significant mechanistic and kinetic variability as group 2 is descended. In an attempt to place these advances in the broader context of contemporary main group element chemistry, this review focusses on the developing state of the art in both multiple bond heterofunctionalisation and cross coupling catalysis. We review specific advances in alkene and alkyne hydroamination and hydrophosphination catalysis and related extensions of this reactivity that allow the synthesis of a wide variety of acyclic and heterocyclic small molecules. The use of heavier alkaline earth hydride derivatives as pre-catalysts and intermediates in multiple bond hydrogenation, hydrosilylation and hydroboration is also described along with the emergence of these and related reagents in a variety of dehydrocoupling processes that allow that facile catalytic construction of Si-C, Si-N and B-N bonds.
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Affiliation(s)
- Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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Fan X, Zheng J, Li ZH, Wang H. Organoborane Catalyzed Regioselective 1,4-Hydroboration of Pyridines. J Am Chem Soc 2015; 137:4916-9. [DOI: 10.1021/jacs.5b03147] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Xiaoting Fan
- Collaborative Innovation
Center of Chemistry for Energy Material, Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Handan Road 220, Shanghai, 200433, China
| | - Junhao Zheng
- Collaborative Innovation
Center of Chemistry for Energy Material, Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Handan Road 220, Shanghai, 200433, China
| | - Zhen Hua Li
- Collaborative Innovation
Center of Chemistry for Energy Material, Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Handan Road 220, Shanghai, 200433, China
| | - Huadong Wang
- Collaborative Innovation
Center of Chemistry for Energy Material, Shanghai Key Laboratory of
Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Handan Road 220, Shanghai, 200433, China
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11
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Xing YM, Zhang L, Fang DC. DFT Studies on the Mechanism of Palladium(IV)-Mediated C–H Activation Reactions: Oxidant Effect and Regioselectivity. Organometallics 2015. [DOI: 10.1021/om501239n] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Yan-Mei Xing
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Lei Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - De-Cai Fang
- College of Chemistry, Beijing Normal University, Beijing 100875, China
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12
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Edelmann FT. Lanthanides and actinides: Annual survey of their organometallic chemistry covering the year 2013. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.09.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zhao X, Liu J, Wang H, Zou Y, Li S, Zhang S, Zhou H, Wu J, Tian Y. Synthesis, crystal structures and two-photon absorption properties of triphenylamine cyanoacetic acid derivative and its organooxotin complexes. Dalton Trans 2015; 44:701-9. [DOI: 10.1039/c4dt02251c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Three novel organooxotin complexes (Z1, Z2 and Z3) exhibit large 2PA cross-section per molecular weight and can be used as potential anti-tumor agents.
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Affiliation(s)
- Xuesong Zhao
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Jie Liu
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Hui Wang
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Yan Zou
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Shengli Li
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Shengyi Zhang
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Hongping Zhou
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Jieying Wu
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
| | - Yupeng Tian
- Department of Chemistry
- Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province
- Anhui University
- Hefei 230039
- P. R. China
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Dhokale B, Jadhav T, Mobin SM, Misra R. Meso enyne substituted BODIPYs: synthesis, structure and properties. Dalton Trans 2015; 44:15803-12. [DOI: 10.1039/c5dt00565e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We report the synthesis of meso enyne substituted BODIPYs by the reaction of 8-chloro BODIPY with terminal alkynes under Sonogashira coupling conditions, and by Pd–Cu catalyzed hydroalkynylation reaction of terminal alkynes, across the –CC– bond of meso alkynylated BODIPYs.
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Affiliation(s)
- Bhausaheb Dhokale
- Department of Chemistry
- Indian Institute of Technology
- Indore 452 017
- India
| | - Thaksen Jadhav
- Department of Chemistry
- Indian Institute of Technology
- Indore 452 017
- India
| | - Shaikh M. Mobin
- Department of Chemistry
- Indian Institute of Technology
- Indore 452 017
- India
| | - Rajneesh Misra
- Department of Chemistry
- Indian Institute of Technology
- Indore 452 017
- India
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Atom-efficient regioselective 1,2-dearomatization of functionalized pyridines by an earth-abundant organolanthanide catalyst. Nat Chem 2014; 6:1100-7. [PMID: 25411889 DOI: 10.1038/nchem.2087] [Citation(s) in RCA: 151] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 09/12/2014] [Indexed: 12/22/2022]
Abstract
Developing earth-abundant, non-platinum metal catalysts for high-value chemical transformations is a critical challenge to contemporary chemical synthesis. Dearomatization of pyridine derivatives is an important transformation to access a wide range of valuable nitrogenous natural products, pharmaceuticals and materials. Here, we report an efficient 1,2-regioselective organolanthanide-catalysed pyridine dearomatization process using pinacolborane, which is compatible with a broad range of pyridines and functional groups and employs equimolar reagent stoichiometry. Regarding the mechanism, derivation of the rate law from NMR spectroscopic and kinetic measurements suggests first order in catalyst concentration, fractional order in pyridine concentration and inverse first order in pinacolborane concentration, with C=N insertion into the La-H bond as turnover-determining. An energetic span analysis affords a more detailed understanding of experimental activity trends and the unusual kinetic behaviour, and proposes the catalyst 'resting' state and potential deactivation pathways.
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Lima CGS, Silva S, Gonçalves RH, Leite ER, Schwab RS, Corrêa AG, Paixão MW. Highly Efficient and Magnetically Recoverable Niobium Nanocatalyst for the Multicomponent Biginelli Reaction. ChemCatChem 2014. [DOI: 10.1002/cctc.201402689] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Lyubov DM, Cherkasov AV, Fukin GK, Ketkov SY, Shavyrin AS, Trifonov AA. Trinuclear alkyl hydrido rare-earth complexes supported by amidopyridinato ligands: synthesis, structures, C–Si bond activation and catalytic activity in ethylene polymerization. Dalton Trans 2014; 43:14450-60. [DOI: 10.1039/c4dt00806e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
[(Ap9MeLu)3(μ2-H)3(μ3-H)2(CH2SiMe3)(thf)2] was synthesized. For Y and Yb C–Si bond activation occurs affording [(Ap9MeLu)3(μ2-H)3(μ3-H)2(CH2SiMe3)(thf)2] and [(Ap9MeLn)3(μ2-H)3(μ3-H)2(CH2SiH2Ph)(thf)2].
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Affiliation(s)
- Dmitry M. Lyubov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod, Russia
- Nizhny Novgorod State University
- Nizhny Novgorod, Russia
| | - Anton V. Cherkasov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod, Russia
- Nizhny Novgorod State University
- Nizhny Novgorod, Russia
| | - Georgy K. Fukin
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod, Russia
- Nizhny Novgorod State University
- Nizhny Novgorod, Russia
| | - Sergey Yu. Ketkov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod, Russia
- Nizhny Novgorod State University
- Nizhny Novgorod, Russia
| | - Andrey S. Shavyrin
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod, Russia
| | - Alexander A. Trifonov
- G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod, Russia
- Nizhny Novgorod State University
- Nizhny Novgorod, Russia
- A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences
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Doster ME, Johnson SA. Carbon–Hydrogen Bond Stannylation and Alkylation Catalyzed by Nitrogen-Donor-Supported Nickel Complexes: Intermediates with Ni–Sn Bonds and Catalytic Carbostannylation of Ethylene with Organostannanes. Organometallics 2013. [DOI: 10.1021/om4003889] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Meghan E. Doster
- Department of Chemistry & Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Samuel A. Johnson
- Department of Chemistry & Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
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