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Rumyantsev AV, Bushkov NS, Ryzhikova MA, Zhizhin AA, Takazova RU, Talanova VN, Gutsul EI, Novikov RA, Zhizhko PA, Zarubin DN. Readily available Ti-based in situ catalytic system for oxo/imido heterometathesis. Dalton Trans 2024; 53:4976-4983. [PMID: 38393646 DOI: 10.1039/d3dt04388f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2024]
Abstract
We investigate Ti(NEt2)4 supported on silica dehydroxylated at 700 °C as an easily accessible pre-catalyst for oxo/imido heterometathesis reactions. Being activated with TolNH2, the supported Ti amide (SiO)Ti(NEt2)3 (1) demonstrates catalytic activity in the imidation of ketones with N-sulfinylamines comparable with the most active previously described well-defined imido catalyst (SiO)Ti(NtBu)(Me2Pyr)(py)2 (2) (Me2Pyr = 2,5-dimethylpyrrolyl), which implies the in situ formation of surface imido species in this system. The materials obtained via treatment of 1 with anilines (TolNH2 (1a) and p-MeOC6H415NH2 (1b)) were studied with IR, EA and 1H, 13C, 15N and 2D solid-state NMR, although the proposed imido intermediate has not been detected, pointing towards tris-amides (SiO)Ti(NHC6H4X)3 (X = Me, OMe) being the major surface species in the isolated materials 1a and 1b. The system 1/TolNH2 was tested in a range of imidation reactions and demonstrated excellent performance for express high-yielding preparation of ketimines, formamidines, lactone imidates and sulfurdiimines, making it a convenient alternative to the well-defined supported Ti imido catalysts.
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Affiliation(s)
- Andrey V Rumyantsev
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
- Department of Chemistry, Moscow State University, Vorob'evy Gory, 1, 119992 Moscow, Russia
| | - Nikolai S Bushkov
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
| | - Margarita A Ryzhikova
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
- Higher Chemical College, D. Mendeleev University of Chemical Technology of Russia, Miusskaya sq., 9, 125047 Moscow, Russia
| | - Anton A Zhizhin
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
| | - Rina U Takazova
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
| | - Valeria N Talanova
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
| | - Evgenii I Gutsul
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
| | - Roman A Novikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp., 47, 119991 Moscow, Russia
| | - Pavel A Zhizhko
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
| | - Dmitry N Zarubin
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str., 28, 119334 Moscow, Russia.
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Núñez-Zarur F, Díaz López E, Restrepo A. Alkane C-H activation and ligand exchange on silica supported d 0 metal alkylidenes: relevance to alkane metathesis. Dalton Trans 2022; 51:6416-6426. [PMID: 35388847 DOI: 10.1039/d2dt00434h] [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]
Abstract
In this work, we study the ligand exchange process between an alkane and a series of silica supported metal alkylidenes, which may occur by different pathways: C-H addition, σ-bond metathesis, and α-H abstraction. The results indicate that the α-H abstraction pathway is the preferred one, regardless of the catalyst and ligands. This is in contrast to the expected preference for the C-H addition route. When looking for the origin of this preference, our calculations revealed that the α-H abstraction pathway is driven by entropy, which favors the initial dissociation of the alkyl ligand from the catalyst.
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Affiliation(s)
- Francisco Núñez-Zarur
- Facultad de Ciencias Básicas, Universidad de Medellín, Carrera 87 N° 30-65, 050026 Medellín, Colombia.
| | - Estefanía Díaz López
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain
| | - Albeiro Restrepo
- Instituto de Química, Universidad de Antioquia, Calle 70 N° 52-21, 050010 Medellín, Colombia
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Núñez-Zarur F, Solans-Monfort X, Restrepo A. Mechanistic Insights into Alkane Metathesis Catalyzed by Silica-Supported Tantalum Hydrides: A DFT Study. Inorg Chem 2017; 56:10458-10473. [DOI: 10.1021/acs.inorgchem.7b01464] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francisco Núñez-Zarur
- Instituto de Química, Universidad de Antioquia, Calle 70
No. 52-21, 050010 Medellín, Colombia
| | | | - Albeiro Restrepo
- Instituto de Química, Universidad de Antioquia, Calle 70
No. 52-21, 050010 Medellín, Colombia
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