451
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Kenny R, Liu F. Trifunctional Organocatalysts: Catalytic Proficiency by Cooperative Activation. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500179] [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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452
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Daigle M, Bi W, Légaré MA, Morin JF, Fontaine FG. Synthesis of Carboxylate Cp*Zr(IV) Species: Toward the Formation of Novel Metallocavitands. Inorg Chem 2015; 54:5547-55. [PMID: 25993021 DOI: 10.1021/acs.inorgchem.5b00634] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
With the intent of generating metallocavitands isostructural to species [(CpZr)3(μ(3)-O)(μ(2)-OH)3(κO,O,μ(2)-O2C(R))3](+), the reaction of Cp*2ZrCl2 and Cp*ZrCl3 with phenylcarboxylic acids was carried out. Depending on the reaction conditions, five new complexes were obtained, which consisted of Cp*2ZrCl(κ(2)-OOCPh) (1), (Cp*ZrCl(κ(2)-OOCPh))2(μ-κ(2)-OOCPh)2 (2), [(Cp*Zr(κ(2)-OOCPh))2(μ-κ(2)-OOCPh)2(μ(2)-OH)2]·Et2O (3·Et2O), [[Cp*ZrCl2](μ-Cl)(μ-OH)(μ-O2CC6H5)[Cp*Zr]]2(μ-O2CC6H5)2 (4), and [Cp*ZrCl4][(Cp*Zr)3(κ2-OOC(C6H4Br)3(μ3-O)(μ2-Cl)2(μ2-OH)] [5](+)[Cp*ZrCl4](-). The structural characterization of the five complexes was carried out. Species 3·Et2O exhibits host-guest properties where the diethyl ether molecule is included in a cavity formed by two carboxylate moieties. The secondary interactions between the cavity and the diethyl ether molecule affect the structural parameters of the complex, as demonstrated be the comparison of the density functional theory models for 3 and 3·Et2O. Species 5 was shown to be isostructural to the [(CpZr)3(μ(3)-O)(μ(2)-OH)3(κO,O,μ(2)-O2C(R))3](+) metallocavitands.
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Affiliation(s)
- Maxime Daigle
- †Département de Chimie, ‡Centre de Recherche sur les Matériaux Avancés (CERMA), and §Centre de Catalyse et Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec, Québec, Canada, G1V 0A6
| | - Wenhua Bi
- †Département de Chimie, ‡Centre de Recherche sur les Matériaux Avancés (CERMA), and §Centre de Catalyse et Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec, Québec, Canada, G1V 0A6
| | - Marc-André Légaré
- †Département de Chimie, ‡Centre de Recherche sur les Matériaux Avancés (CERMA), and §Centre de Catalyse et Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec, Québec, Canada, G1V 0A6
| | - Jean-François Morin
- †Département de Chimie, ‡Centre de Recherche sur les Matériaux Avancés (CERMA), and §Centre de Catalyse et Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec, Québec, Canada, G1V 0A6
| | - Frédéric-Georges Fontaine
- †Département de Chimie, ‡Centre de Recherche sur les Matériaux Avancés (CERMA), and §Centre de Catalyse et Chimie Verte (C3V), Université Laval, 1045 Avenue de la Médecine, Québec, Québec, Canada, G1V 0A6
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453
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Valdés H, Poyatos M, Peris E. A Nanosized Janus Bis-N-heterocyclic Carbene Ligand Based on a Quinoxalinophenanthrophenazine Core, and Its Coordination to Iridium. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00208] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hugo Valdés
- Departamento de Química
Inorgánica y Orgánica, Universitat Jaume I, Av. de Vicente
Sos Baynat, s/n 12071, Castellón, Spain
| | - Macarena Poyatos
- Departamento de Química
Inorgánica y Orgánica, Universitat Jaume I, Av. de Vicente
Sos Baynat, s/n 12071, Castellón, Spain
| | - Eduardo Peris
- Departamento de Química
Inorgánica y Orgánica, Universitat Jaume I, Av. de Vicente
Sos Baynat, s/n 12071, Castellón, Spain
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454
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García-Simón C, Gramage-Doria R, Raoufmoghaddam S, Parella T, Costas M, Ribas X, Reek JNH. Enantioselective hydroformylation by a Rh-catalyst entrapped in a supramolecular metallocage. J Am Chem Soc 2015; 137:2680-7. [PMID: 25632976 DOI: 10.1021/ja512637k] [Citation(s) in RCA: 155] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Regio- and enantioselective hydroformylation of styrenes is attained upon embedding a chiral Rh complex in a nonchiral supramolecular cage formed from coordination-driven self-assembly of macrocyclic dipalladium complexes and tetracarboxylate zinc porphyrins. The resulting supramolecular catalyst converts styrene derivatives into aldehyde products with much higher chiral induction in comparison to the nonencapsulated Rh catalyst. Spectroscopic analysis shows that encapsulation does not change the electronic properties of the catalyst nor its first coordination sphere. Instead, enhanced enantioselectivity is rationalized by the modification of the second coordination sphere occurring upon catalyst inclusion inside the cage, being one of the few examples in achieving an enantioselective outcome via indirect through-space control of the chirality around the catalyst center. This effect resembles those taking place in enzymatic sites, where structural constraints imposed by the enzyme cavity can impart stereoselectivities that cannot be attained in bulk. These results are a showcase for the future development of asymmetric catalysis by using size-tunable supramolecular capsules.
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Affiliation(s)
- Cristina García-Simón
- Grup de Química Bioinorgànica i Supramolecular, Institut de Química Computacional i Catàlisi, and Departament de Química, Universitat de Girona. Campus Montilivi , Girona E17071 Catalonia, Spain
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455
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Wang JH, Tang GM, Wang YT, Cui YZ, Wang JJ, Ng SW. A series of phenyl sulfonate metal coordination polymers as catalysts for one-pot Biginelli reactions under solvent-free conditions. Dalton Trans 2015; 44:17829-40. [DOI: 10.1039/c5dt03135d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A series of phenyl sulfonate metal coordination polymers have been obtained under hydrothermal conditions, which show high catalytic performances for one-pot Biginelli condensation reactions under solvent-free conditions.
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Affiliation(s)
- Jin-Hua Wang
- Department of Chemical Engineering
- Shandong Provincial Key Laboratory of Fine Chemicals
- Qilu University of Technology
- Jinan
- China
| | - Gui-Mei Tang
- Department of Chemical Engineering
- Shandong Provincial Key Laboratory of Fine Chemicals
- Qilu University of Technology
- Jinan
- China
| | - Yong-Tao Wang
- Department of Chemical Engineering
- Shandong Provincial Key Laboratory of Fine Chemicals
- Qilu University of Technology
- Jinan
- China
| | - Yue-Zhi Cui
- Department of Chemical Engineering
- Shandong Provincial Key Laboratory of Fine Chemicals
- Qilu University of Technology
- Jinan
- China
| | - Jun-Jie Wang
- Department of Chemistry
- Anyang Normal University
- Henan
- PR China
| | - Seik Weng Ng
- Department of Chemistry
- University of Malaya
- Kuala Lumpur
- Malaysia
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456
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Xi FG, Yang Y, Liu H, Yao HF, Gao EQ. Different acidity and additive effects of zirconium metal–organic frameworks as catalysts for cyanosilylation. RSC Adv 2015. [DOI: 10.1039/c5ra13149a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Both hydrous and anhydrous UiO-66 MOFs are heterogeneous and recyclable catalysts for aldehyde cyanosilylation owing to Brønsted and Lewis acidity, respectively, and pyridine can enhance the activity, instead of poisoning the catalysts.
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Affiliation(s)
- Fu-Gui Xi
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- College of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Yang Yang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- College of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Hui Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- College of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Hong-Fei Yao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- College of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
| | - En-Qing Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- College of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
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457
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Kankala S, Pagadala R, Maddila S, Vasam CS, Jonnalagadda SB. Silver(i)–N-heterocyclic carbene catalyzed multicomponent reactions: a facile synthesis of multisubstituted pyridines. RSC Adv 2015. [DOI: 10.1039/c5ra16582b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A room temperature four component reaction between aromatic aldehydes, CH2(CN)2and NH4OAc with ketones mediated by Ag(i)–NHC pre-catalysts to produce multisubstituted pyridines in a short reaction time in eco-friendly ethanol was described.
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Affiliation(s)
- Shravankumar Kankala
- School of Chemistry & Physics
- University of Kwazulu-Natal
- Westville Campus
- Durban-4000
- South Africa
| | - Ramakanth Pagadala
- School of Chemistry & Physics
- University of Kwazulu-Natal
- Westville Campus
- Durban-4000
- South Africa
| | - Suresh Maddila
- School of Chemistry & Physics
- University of Kwazulu-Natal
- Westville Campus
- Durban-4000
- South Africa
| | - Chandra Sekhar Vasam
- Department of Chemistry
- Satavahana University
- Karimnagar
- India
- Department of Pharmaceutical Chemistry
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