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Zou H, Wang Z, Guo D, Zhang L, Wang S, Zhu X. Synthesis and catalytic activity of tetradentate β-diketiminato rare-earth metal monoalkyl complexes in tandem Oppenauer oxidation and cross-aldol condensation. Dalton Trans 2023; 53:267-275. [PMID: 38038403 DOI: 10.1039/d3dt03374k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
A series of unsymmetric tetradentate β-diketiminato rare-earth metal monoalkyl complexes were synthesized, and their catalytic behavior has been well developed. Indole-incorporated β-diketiminato proligands H2L (L = MeC(NDipp)CHC(Me)NCH2CH2-3-(1-R-C8H4N), R = CH2-(2-C4H7O), L1; R = (CH2)2OMe, L2; Dipp = 2,6-iPr2C6H3) were prepared by the reaction of an arylamino-enone with 1-substituted-tryptamine in good yields. Treatment of the proligands with the rare-earth metal trialkyl complexes RE(CH2SiMe3)3(THF)2 generated the corresponding unsymmetric N,N,C,O-tetradentate β-diketiminato rare-earth metal monoalkyl complexes LRE(CH2SiMe3) (L1, RE = Y (1a), Gd (1b), Yb (1c), Lu (1d); L2, RE = Y (2a), Gd (2b), Yb (2c), and Lu(2d)). During the process, the activation of the sp2 C-H bond at the 2-position of the indole ring led to the formation of an unprecedented β-diketiminato dianion L2-, bonding to the rare-earth metal ions in a chelating N,N,C,O-tetradentate manner. Further studies indicated that these tetradentate rare-earth metal complexes could initiate the Oppenauer oxidation of secondary alcohols into the corresponding ketones in high yields. In the case of primary alcohols, a tandem Oppenauer oxidation and cross-aldol condensation occurred unexpectedly. Various α-mono-substituted benzylidene acetones, α,α'-bis-substituted benzylidene acetones and cyclohexanones were obtained under mild conditions only by controlling the molar ratio of alcohols to ketones. Notably, all these alkenylation ketones exhibited exclusive E configuration.
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Affiliation(s)
- Haiyan Zou
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Ziqian Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Dianjun Guo
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Lijun Zhang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
| | - Shaowu Wang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
- Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Complexes for Materials Chemistry and Application, College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China
| | - Xiancui Zhu
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241002, China.
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Dong Q, Ma Z, Hao Z, Han Z, Lin J, Lu G. Preparation of trinuclear ruthenium clusters based on piconol ligands and their application in Oppenauer‐type oxidation of secondary alcohols. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6336] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qing Dong
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zongwen Ma
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zhiqiang Hao
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zhangang Han
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Jin Lin
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Guo‐Liang Lu
- Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences The University of Auckland Auckland New Zealand
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Regioselective C-H arylation of imidazoles employing macrocyclic palladium(II) complex of organoselenium ligand. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121907] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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4
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Preformed molecular complexes of metals with organoselenium ligands: Syntheses and applications in catalysis. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213885] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Grabelʼnykh VA, Bogdanova IN, Nikonova VS, Sosnovskaya NG, Istomina NV, Russavskaya NV, Albanov AI, Rozentsveig IB, Korchevin NA. Nucleophilic Cleavage of the Ether Bond of Chlorex in the Chalcogenation with Diphenyl Dichalcogenides in the System Hydrazine Hydrate–KOH. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220090273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Palladium complexes of chalcogenoethanamine (S/Se) bidentate ligands: Applications in catalytic arylation of C H and O H bonds. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114597] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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7
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Bhatt R, Bhuvanesh N, Sharma KN, Joshi H. Palladium Complexes of Thio/Seleno-Ether Containing N
-Heterocyclic Carbenes: Efficient and Reusable Catalyst for Regioselective C-H Bond Arylation. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201901259] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ramprasad Bhatt
- Department of Chemistry; Birla Institute of Technology and Science; Pilani Campus 333031 Pilani India
| | - Nattamai Bhuvanesh
- Department of Chemistry; Texas A&M University; PO Box 30012 College Station 77842-3012 Texas USA
| | - Kamal Nayan Sharma
- Department of Chemistry; Malaviya National Institute of Technology Jaipur; J.L.N. Marg 302017 Jaipur Rajasthan India
- Department of Chemistry; ASAS, Amity University Haryana (AUH); Manesar; 122413 Gurgaon India
| | - Hemant Joshi
- Department of Chemistry; School of Chemical Sciences and Pharmacy; Central University of Rajasthan; NH-8, Bandarsindri 305817 Ajmer Rajasthan India
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Oswal P, Arora A, Singh S, Nautiyal D, Kumar S, Rao GK, Kumar A. Organochalcogen ligands in catalysis of oxidation of alcohols and transfer hydrogenation. Dalton Trans 2020; 49:12503-12529. [PMID: 32804180 DOI: 10.1039/d0dt01201g] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Organochalcogen compounds have been used as the building blocks for the development of a variety of catalysts that have been studied comprehensively during the last two decades for several chemical transformations. Transfer hydrogenation (reduction of carbonyl compounds to alcohols) and oxidation of alcohols (conversion of alcohols to their respective ketones and aldehydes) are also among such chemical transformations. Some compilations are available in the literature on the development of catalysts, based on organochalcogen ligands, and their applications in Heck reaction, Suzuki reaction, and other related aspects. Some review articles have also been published on different aspects of oxidation of alcohols and transfer hydrogenation. However, no such article is available in the literature on the syntheses and use of organochalcogen ligated catalysts for these two reactions. In this perspective, a survey of developments pertaining to the synthetic aspects of such organochalcogen (S/Se/Te) based catalysts for the two reactions has been made. In addition to covering the syntheses of chalcogen ligands, their metal complexes and nanoparticles (NPs), emphasis has also been placed on the efficient conversion of different substrates during catalytic reactions, diversity in catalytic potential and mechanistic aspects of catalysis. It also includes the analysis of comparison (in terms of efficiency) between this unique class of catalysts and efficient catalysts without a chalcogen donor. The future scope of this area has also been highlighted.
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Affiliation(s)
- Preeti Oswal
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248012, India.
| | - Aayushi Arora
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248012, India.
| | - Siddhant Singh
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248012, India.
| | - Divyanshu Nautiyal
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248012, India.
| | - Sushil Kumar
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248012, India.
| | - Gyandshwar Kumar Rao
- Department of Chemistry Biochemistry and Forensic Science, Amity School of Applied Sciences, Amity University Haryana, Gurgaon, Haryana 122413, India
| | - Arun Kumar
- Department of Chemistry, School of Physical Sciences, Doon University, Dehradun, 248012, India.
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Sharma AK, Joshi H, Singh AK. Catalysis with magnetically retrievable and recyclable nanoparticles layered with Pd(0) for C–C/C–O coupling in water. RSC Adv 2020; 10:6452-6459. [PMID: 35495980 PMCID: PMC9049700 DOI: 10.1039/c9ra10618a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 01/27/2020] [Indexed: 11/29/2022] Open
Abstract
Nanoparticles layered with palladium(0) were prepared from nano-sized magnetic Fe3O4 by coating it with silica and then reacting sequentially with phenylselenyl chloride under an N2 atmosphere and palladium(ii) chloride in water. The resulting Fe3O4@SiO2@SePh@Pd(0) NPs are magnetically retrievable and the first example of NPs in which the outermost layer of Pd(0) is mainly held by selenium. The weight percentage of Pd in the NPs was found to be 1.96 by ICP-AES. The NPs were authenticated via TEM, SEM-EDX, XPS, and powder XRD and found to be efficient as catalysts for the C–O and C–C (Suzuki–Miyaura) coupling reactions of ArBr/Cl in water. The oxidation state of Pd in the NPs having size distribution from ∼12 to 18 nm was inferred as zero by XPS. They can be recycled more than seven times. The main features of the proposed protocols are their mild reaction conditions, simplicity, and efficiency as the catalyst can be separated easily from the reaction mixture by an external magnet and reused for a new reaction cycle. The optimum loading (in mol% of Pd) was found to be 0.1–1.0 and 0.01–1.0 for O-arylation and Suzuki–Miyaura coupling, respectively. For ArCl, the required amount of NPs was more as compared to that needed for ArBr. The nature of catalysis is largely heterogeneous. Fe3O4@SiO2@SePh@Pd(0) (Pd, 1.96%) as the first example of NPs having a Pd(0) layer held by selenium can execute C–C/C–O coupling in 2–6 h (80 °C).![]()
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Affiliation(s)
- Alpesh K. Sharma
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Hemant Joshi
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Ajai K. Singh
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
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(η6-Benzene)Ru(II) half-sandwich complexes of pyrazolated chalcogenoethers for catalytic activation of aldehydes to amides transformation. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.09.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Wang Y, Ren S, Zhang W, Xue B, Qi X, Sun H, Li X, Fuhr O, Fenske D. Syntheses of hydrido selenophenolato iron(II) complexes and their catalytic application in hydrosilylation of aldehydes and ketones. CATAL COMMUN 2018. [DOI: 10.1016/j.catcom.2018.06.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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12
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Dubey P, Gupta S, Singh AK. Base free N-alkylation of anilines with ArCH 2OH and transfer hydrogenation of aldehydes/ketones catalyzed by the complexes of η 5-Cp*Ir(iii) with chalcogenated Schiff bases of anthracene-9-carbaldehyde. Dalton Trans 2018; 47:3764-3774. [PMID: 29445807 DOI: 10.1039/c7dt04326k] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The condensation of anthracene-9-carbaldehyde with 2-(phenylthio/seleno)ethylamine results in Schiff bases [PhS(CH2)2C[double bond, length as m-dash]N-9-C14H9](L1) and [PhSe(CH2)2C[double bond, length as m-dash]N-9-C14H9] (L2). On their reaction with [(η5-Cp*)IrCl(μ-Cl)]2 and CH3COONa at 50 °C followed by treatment with NH4PF6, iridacycles, [(η5-Cp*)Ir(L-H)][PF6] (1: L = L1; 2: L = L2), result. The same reaction in the absence of CH3COONa gives complexes [(η5-Cp*)Ir(L)Cl][PF6] (3-4) in which L = L1(3)/L2(4) ligates in a bidentate mode. The ligands and complexes were authenticated with HR-MS and NMR spectra [1H, 13C{1H} and 77Se{1H} (in the case of L2 and its complexes only)]. Single crystal structures of L2 and half sandwich complexes 1-4 were established with X-ray crystallography. Three coordination sites of Ir in each complex are covered with η5-Cp* and on the remaining three, donor atoms present are: N, S/Se and C-/Cl-, resulting in a piano-stool structure. The moisture and air insensitive 1-4 act as efficient catalysts under mild conditions for base free N-alkylation of amines with benzyl alcohols and transfer hydrogenation (TH) of aldehydes/ketones. The optimum loading of 1-4 as a catalyst is 0.1-0.5 mol% for both the activations. The best reaction temperature is 80 °C for transfer hydrogenation and 100 °C for N-alkylation. The mercury poisoning test supports a homogeneous pathway for both the reactions catalyzed by 1-4. The two catalytic processes are most efficient with 3 followed by 4 > 1 > 2. The mechanism proposed on the basis of HR-MS of the reaction mixtures of the two catalytic processes taken after 1-2 h involves the formation of an alkoxy and hydrido species. The real catalytic species proposed in the case of iridacycles results due to the loss of the Cp* ring.
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Affiliation(s)
- Pooja Dubey
- Department of Chemistry, Indian Institute of Technology, Delhi, New Delhi 110016, India.
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13
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Ribaudo G, Bellanda M, Menegazzo I, Wolters LP, Bortoli M, Ferrer-Sueta G, Zagotto G, Orian L. Mechanistic Insight into the Oxidation of Organic Phenylselenides by H 2 O 2. Chemistry 2017; 23:2405-2422. [PMID: 27935210 DOI: 10.1002/chem.201604915] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Indexed: 12/24/2022]
Abstract
The oxidation of organic phenylselenides by H2 O2 is investigated in model compounds, namely, n-butyl phenyl selenide (PhSe(nBu)), bis(phenylselanyl)methane (PhSeMeSePh), diphenyl diselenide (PhSeSePh), and 1,2-bis(phenylselanyl)ethane (PhSeEtSePh). Through a combined experimental (1 H and 77 Se NMR) and computational approach, we characterize the direct oxidation of monoselenide to selenoxide, the stepwise double oxidation of PhSeMeSePh that leads to different diastereomeric diselenoxides, the complete oxidation of the diphenyldiselenide that leads to selenium-selenium bond cleavage, and the subsequent formation of the phenylseleninic product. The oxidation of PhSeEtSePh also results in the formation of phenylseleninic acid along with 1-(vinylseleninyl)benzene, which is derived from a side elimination reaction. The evidence of a direct mechanism, in addition to an autocatalytic mechanism that emerges from kinetic studies, is discussed. By considering our observations of diselenides with chalcogen atoms that are separated by alkyl spacers of different length, a rationale for the advantage of diselenide versus monoselenide catalysts is presented.
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Affiliation(s)
- Giovanni Ribaudo
- Dipartimento di Scienze del Farmaco, Università degli Studi di Padova, Via Marzolo 5, 35131, Padova, Italy
| | - Massimo Bellanda
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Ileana Menegazzo
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Lando P Wolters
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Marco Bortoli
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy
| | - Gerardo Ferrer-Sueta
- Laboratorio de Fisicoquímica Biológica, Instituto de Química Biológica, Facultad de Ciencias, Universidad de la Repúbica, Igua 4225, Montevideo, Uruguay
| | - Giuseppe Zagotto
- Dipartimento di Scienze del Farmaco, Università degli Studi di Padova, Via Marzolo 5, 35131, Padova, Italy
| | - Laura Orian
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, Via Marzolo 1, 35131, Padova, Italy
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Viji M, Tyagi N, Naithani N, Ramaiah D. Aryl appended neutral and cationic half-sandwich ruthenium(ii)–NHC complexes: synthesis, characterisation and catalytic applications. NEW J CHEM 2017. [DOI: 10.1039/c7nj02822a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aryl appended half-sandwich Ru(ii)–NHC complexes were synthesised and their use as selective catalysts for transfer hydrogenation of aromatic ketones was demonstrated.
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Affiliation(s)
- Mambattakkara Viji
- Photosciences and Photonics
- Chemical Sciences and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum 695 019
- India
| | - Nidhi Tyagi
- Photosciences and Photonics
- Chemical Sciences and Technology Division
- CSIR-National Institute for Interdisciplinary Science and Technology
- Trivandrum 695 019
- India
| | - Neeraj Naithani
- Analytical and Spectroscopy Division
- Vikram Sarabhai Space Centre
- Trivandrum 695 022
- India
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15
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Zhang L, Zhang XB, Zhang DD, He SG. Theoretical prediction of the synthesis of 2,3-dihydropyridines through Ir( iii)-catalysed reaction of unsaturated oximes with alkenes. RSC Adv 2017. [DOI: 10.1039/c6ra25501a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The Ir(iii)-catalysed reaction of unsaturated oximes with alkenes was predicted, and the results indicate a more efficient synthesis of 2,3-dihydropyridines.
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Affiliation(s)
- Lei Zhang
- School of Materials Science and Engineering
- Anhui University of Science and Technology
- Huainan 232001
- People's Republic of China
| | - Xiang-Biao Zhang
- School of Chemical Engineering
- Anhui University of Science and Technology
- Huainan 232001
- People's Republic of China
| | - Dan-Dan Zhang
- School of Chemical Engineering
- Anhui University of Science and Technology
- Huainan 232001
- People's Republic of China
| | - Sheng-Gui He
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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Sharma KN, Sharma AK, Joshi H, Singh AK. Polymeric Complex of 1-Phenylsulfanyl/selenylmethyl-1H-Benzotriazole with Ag(I): Pre-catalystfor A3Coupling Affording Propargylamines on aGram/Lab Scale. ChemistrySelect 2016. [DOI: 10.1002/slct.201600788] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kamal N. Sharma
- Department of Chemistry; Indian Institute of Technology Delhi; New Delhi 110016 India
| | - Alpesh K. Sharma
- Department of Chemistry; Indian Institute of Technology Delhi; New Delhi 110016 India
| | - Hemant Joshi
- Department of Chemistry; Indian Institute of Technology Delhi; New Delhi 110016 India
| | - Ajai K. Singh
- Department of Chemistry; Indian Institute of Technology Delhi; New Delhi 110016 India
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Guo B, Xue JY, Li HX, Tan DW, Lang JP. Design of recyclable TEMPO derivatives bearing an ionic liquid moiety and N,N-bidentate group for highly efficient Cu(i)-catalyzed conversion of alcohols into aldehydes and imines. RSC Adv 2016. [DOI: 10.1039/c6ra10373a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Recyclable TEMPO derivatives carrying an ionic liquid moiety and N,N-bidentate group are designed for Cu(i)-catalyzed alcohol to aldehyde and imine conversion.
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Affiliation(s)
- Bin Guo
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Jiang-Yan Xue
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Hong-Xi Li
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Da-Wei Tan
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Jian-Ping Lang
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
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Kumar K, Darkwa J. Effect of chalcogens on CO insertion into the palladium-methyl bond of [(N^N^X)Pd(CH3)](+) (X = O, S, Se) and on CO/ethylene copolymerisation. Dalton Trans 2015; 44:20714-27. [PMID: 26568064 DOI: 10.1039/c5dt03929k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Neutral chloromethylpalladium(II) complexes, [Pd(Cl)(CH3)(L)] (1a-5a) with ligands κ(2)-N^S-2-((3,5-di-tert-butyl-1H-pyrazol-1-yl)methyl)-6-(phenylthiomethyl)pyridine (L1), κ(2)-N^S-2-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-6-(phenylthiomethyl)pyridine (L2), κ(2)-N^Se-2-((3,5-di-tert-butyl-1H-pyrazol-1-yl)methyl)-6-(phenylselanylmethyl)pyridine (L3), κ(2)-N^Se-2-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-6-(phenylselanylmethyl)pyridine (L4), and κ(2)-N^N-2-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-6-(phenoxymethyl)pyridine (L5) have been synthesised and characterised by various spectroscopic techniques. Ligands L1-L4 exhibit Npy^S/Se bidentate coordination whereas L5 shows an Npy^Npz bidentate coordination mode in their corresponding neutral palladium complexes. Abstraction of chloride in neutral palladium complexes with NaBAr4 (BAr4 = tetrakis[3,5-bis(trifluoromethyl)-phenyl]borate) resulted in the formation of the cationic palladium complexes 1b-5b, in which L1-L4 adopt a tridentate Npz^Npy^X (X = S or Se) coordination mode in their respective cationic palladium complexes (1b-4b) whilst L5 in complex 5b adopts a Npy^Npz bidentate coordination mode and the palladium centre is stabilized by the weakly coordinating acetonitrile. Compounds 1b-5b readily undergo CO insertion into the Pd-CH3 bond to form Pd-acyl that determines their ability to catalyse CO/ethylene copolymerisation to polyketones.
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Affiliation(s)
- Kamlesh Kumar
- Department of Chemistry, University of Johannesburg, Auckland Park Kingsway Campus, Auckland Park 2006, South Africa.
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Oxidation and β-Alkylation of Alcohols Catalysed by Iridium(I) Complexes with Functionalised N-Heterocyclic Carbene Ligands. Chemistry 2015; 21:17877-89. [DOI: 10.1002/chem.201502910] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Indexed: 11/07/2022]
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Kalidasan M, Nagarajaprakash R, Mohan Rao K. Synthesis, spectral and molecular studies of half-sandwich arene ruthenium and Cp*Rh/Cp*Ir complexes containing bidentate P-N and E–N ligands (E = S, Se) based on diphenyl(2-pyridyl)phosphine. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1087514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Mahesh Kalidasan
- Department of Chemistry, North Eastern Hill University, Shillong, India
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21
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Pollice R, Dastbaravardeh N, Marquise N, Mihovilovic MD, Schnürch M. Mechanistic and Kinetic Studies of the Direct Alkylation of Benzylic Amines: A Formal C(sp 3)-H Activation Proceeds Actually via a C(sp 2)-H Activation Pathway. ACS Catal 2015; 5:587-595. [PMID: 25838971 PMCID: PMC4372103 DOI: 10.1021/cs501924c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Indexed: 01/18/2023]
Abstract
Mechanistic investigations of a Rh(I)-catalyzed direct C-H alkylation of benzylic amines with alkenes, formally an C(sp3)-H activation, reveal this reaction to proceed via imine intermediates and, hence, via C(sp2)-H activation. The reaction shows a primary kinetic isotope effect of 4.3 at the benzylic C-H position together with a reversible H-D exchange at the same position, which indicates that there are at least two distinct steps in which the corresponding C-H bonds are broken. The imine intermediates are shown to be converted to the final product under the reaction conditions, and a time course analysis of the alkylated imine intermediate shows that it is formed before the final amine product in the course of the reaction.
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Affiliation(s)
- Robert Pollice
- Institute of Applied Synthetic
Chemistry, Vienna University of Technology, Getreidemarkt 9/163-OC, Vienna 1060, Austria
| | | | - Nada Marquise
- Institute of Applied Synthetic
Chemistry, Vienna University of Technology, Getreidemarkt 9/163-OC, Vienna 1060, Austria
| | - Marko D. Mihovilovic
- Institute of Applied Synthetic
Chemistry, Vienna University of Technology, Getreidemarkt 9/163-OC, Vienna 1060, Austria
| | - Michael Schnürch
- Institute of Applied Synthetic
Chemistry, Vienna University of Technology, Getreidemarkt 9/163-OC, Vienna 1060, Austria
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22
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Zhang S, Qarah AF, Gari DR, Jin J. Synthesis and Charge Transfer Complex Study of Silicon-containing Chalcogenoethers. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2014.938745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Müller AL, Bleith T, Roth T, Wadepohl H, Gade LH. Iridium Half-Sandwich Complexes with Di- and Tridentate Bis(pyridylimino)isoindolato Ligands: Stoichiometric and Catalytic Reactivity. Organometallics 2015. [DOI: 10.1021/om501138t] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Astrid L. Müller
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
| | - Tim Bleith
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
| | - Torsten Roth
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
| | - Lutz H. Gade
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
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24
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Prakash O, Joshi H, Kumar U, Sharma AK, Singh AK. Acridine based (S,N,S) pincer ligand: designing silver(i) complexes for the efficient activation of A3 (aldehyde, alkyne and amine) coupling. Dalton Trans 2015; 44:1962-8. [DOI: 10.1039/c4dt02813a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic efficiency for the A3 reaction with complexes 1 and 2, which have been newly synthesized and structurally characterized, is highest for the pincer complex 2.
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Affiliation(s)
- Om Prakash
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Hemant Joshi
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Umesh Kumar
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Alpesh K. Sharma
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Ajai K. Singh
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
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25
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Saleem F, Rao GK, Kumar S, Singh MP, Singh AK. Complexes of (η6-benzene)ruthenium(ii) with 1,4-bis(phenylthio/seleno-methyl)-1,2,3-triazoles: synthesis, structure and applications in catalytic activation of oxidation and transfer hydrogenation. Dalton Trans 2015; 44:19141-52. [DOI: 10.1039/c5dt02926k] [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]
Abstract
1,4-Bis(phenylthio/seleno methyl)-1,2,3-triazoles (L1–L4) synthesized by a ‘Click’ reaction form complexes [(η6-C6H6)RuClL]PF6 (L = L1–L4) suitable as catalyst for oxidation/transfer hydrogenation.
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Affiliation(s)
- Fariha Saleem
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Gyandshwar K. Rao
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Satyendra Kumar
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Mahabir Pratap Singh
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Ajai K. Singh
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
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26
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Prakash O, Joshi H, Sharma KN, Gupta PL, Singh AK. Transfer Hydrogenation (pH Independent) of Ketones and Aldehydes in Water with Glycerol: Ru, Rh, and Ir Catalysts with a COOH Group near the Metal on a (Phenylthio)methyl-2-pyridine Scaffold. Organometallics 2014. [DOI: 10.1021/om500515z] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Om Prakash
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Hemant Joshi
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Kamal Nayan Sharma
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Pancham Lal Gupta
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Ajai K. Singh
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi 110016, India
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27
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Sharma AK, Joshi H, Sharma KN, Gupta PL, Singh AK. 2-Propanol vs Glycerol as Hydrogen Source in Catalytic Activation of Transfer Hydrogenation with (η6-Benzene)ruthenium(II) Complexes of Unsymmetrical Bidentate Chalcogen Ligands. Organometallics 2014. [DOI: 10.1021/om500579r] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Alpesh K. Sharma
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi − 110016, India
| | - Hemant Joshi
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi − 110016, India
| | - Kamal Nayan Sharma
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi − 110016, India
| | - Pancham L. Gupta
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi − 110016, India
| | - Ajai K. Singh
- Department of Chemistry, Indian Institute of Technology Delhi, New Delhi − 110016, India
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