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Brahma R, Baruah JB. Intrinsic structural features of coordination polymers make an impact on dye selectivity. CrystEngComm 2021. [DOI: 10.1039/d1ce00481f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Differences in hydrogen-bonded assembly help in recognition of dyes.
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Affiliation(s)
- Rinki Brahma
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati – 781 039
- India
| | - Jubaraj B. Baruah
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati – 781 039
- India
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Sánchez-Antonio O, Romero-Sedglach KA, Vázquez-Orta EC, Juaristi E. New Mesoporous Silica-Supported Organocatalysts Based on (2S)-(1,2,4-Triazol-3-yl)-Proline: Efficient, Reusable, and Heterogeneous Catalysts for the Asymmetric Aldol Reaction. Molecules 2020; 25:molecules25194532. [PMID: 33022926 PMCID: PMC7583865 DOI: 10.3390/molecules25194532] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 09/30/2020] [Accepted: 10/01/2020] [Indexed: 01/02/2023] Open
Abstract
Novel organocatalytic systems based on the recently developed (S)-proline derivative (2S)-[5-(benzylthio)-4-phenyl-(1,2,4-triazol)-3-yl]-pyrrolidine supported on mesoporous silica were prepared and their efficiency was assessed in the asymmetric aldol reaction. These materials were fully characterized by FT-IR, MS, XRD, and SEM microscopy, gathering relevant information regarding composition, morphology, and organocatalyst distribution in the doped silica. Careful optimization of the reaction conditions required for their application as catalysts in asymmetric aldol reactions between ketones and aldehydes afforded the anticipated aldol products with excellent yields and moderate diastereo- and enantioselectivities. The recommended experimental protocol is simple, fast, and efficient providing the enantioenriched aldol product, usually without the need of a special work-up or purification protocol. This approach constitutes a remarkable improvement in the field of heterogeneous (S)-proline-based organocatalysis; in particular, the solid-phase silica-bonded catalytic systems described herein allow for a substantial reduction in solvent usage. Furthermore, the supported system described here can be recovered, reactivated, and reused several times with limited loss in catalytic efficiency relative to freshly synthesized organocatalysts.
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Affiliation(s)
- Omar Sánchez-Antonio
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
| | - Kevin A. Romero-Sedglach
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
| | - Erika C. Vázquez-Orta
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
| | - Eusebio Juaristi
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
- El Colegio Nacional, Luis González Obregón # 23, Centro Histórico, 06020 Ciudad de México, Mexico
- Correspondence: or
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