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https://hdl.handle.net/10316/111857
Título: | Novel organotin-PTA complexes supported on mesoporous carbon materials as recyclable catalysts for solvent-free cyanosilylation of aldehydes | Autor: | Mahmoud, Abdallah G. Librando, Ivy L. Paul, Anup Carabineiro, Sónia A. C. Ferraria, Ana Maria Botelho do Rego, Ana Maria Guedes da Silva, M. Fátima C. Geraldes, Carlos F. G. C. Pombeiro, Armando J. L. |
Palavras-chave: | Cyanosilylation; Carbon materials; Heterogeneous catalysis; 1,3,5-triaza-7-phosphaadamantane; Microwave; Tetrel σ-hole bond | Data: | 2023 | Editora: | Elsevier | Projeto: | UIDB/00100/2020 UIDP/00100/2020 LA/P/0056/2020 UIDB/04565/2020 UIDP/04565/2020 LA/P/0140/2020 UIDB/50020/2020 UIDP/50020/2020 UIDB/50006/2020 UIDP/50006/2020 UIDB/00313/2020 UIDP/00313/2020 |
Título da revista, periódico, livro ou evento: | Catalysis Today | Volume: | 423 | Resumo: | New organotin compounds with general formula [(PTA-CH2-C6H4-p-COO)SnR3]Br (where R is Me for 3 and Ph for 4; PTA = 1,3,5-triaza-7-phosphaadamantane), bearing the methylene benzoate PTA derivative, were synthesized through a mild two-step process. The compounds were characterized by Fourier transform infrared spectroscopy, electrospray ionization mass spectrometry, elemental analysis and nuclear magnetic resonance spectroscopy (NMR). They were heterogenized on commercially available activated carbon (AC) and multiwalled carbon nanotubes (CNT), as well as on their chemically modified analogues. The obtained materials were characterized by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Complex 3 supported on activated carbon (3-AC) was found to be an active and recyclable catalyst for the cyanosilylation of several aromatic and aliphatic aldehydes. Using 3-AC with a low loading of 0.1 mol% several substrates were quantitatively converted, within just 5 min at 50 ◦C and under microwave irradiation in solvent-free conditions. Multinuclear NMR analysis suggested a mechanism that potentially involves a double activation process, where the nucleophilic phosphorus at the PTA derivative acts as a Lewis base and the Sn(IV) metal centre as a Lewis acid. | URI: | https://hdl.handle.net/10316/111857 | ISSN: | 09205861 | DOI: | 10.1016/j.cattod.2023.114270 | Direitos: | openAccess |
Aparece nas coleções: | I&D CQC - Artigos em Revistas Internacionais FCTUC Ciências da Vida - Artigos em Revistas Internacionais |
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Novel organotin-PTA complexes supported on mesoporous carbon materials as recyclable catalysts for solvent-free cyanosilylation of aldehydes.pdf | 4.95 MB | Adobe PDF | Ver/Abrir |
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