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Ruthenium−p-cymene complexes with acylthiourea, and its heterogenized form on graphene oxide act as catalysts for the synthesis of quinoxaline derivatives
•Five ruthenium-p-cymene complexes were synthesized and characterized.•One of the complexes was heterogenized over graphene oxide.•Catalytic activity of both the homogeneous and heterogeneous catalysts was studied towards quinoxaline synthesis from nitroaniline and hydroxy ketone.•Heterogeneous cata...
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Published in: | Journal of organometallic chemistry 2021-09, Vol.949, p.121933, Article 121933 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | •Five ruthenium-p-cymene complexes were synthesized and characterized.•One of the complexes was heterogenized over graphene oxide.•Catalytic activity of both the homogeneous and heterogeneous catalysts was studied towards quinoxaline synthesis from nitroaniline and hydroxy ketone.•Heterogeneous catalyst was reusable up to five cycles.
Synthesis of a series of half-sandwich Ru(II) complexes (1-5) containing acylthiourea ligand is reported herein. All the Ru(II) complexes were well characterized by analytical and spectroscopic (UV-Vis, FT-IR, NMR and mass spectrometry) methods. Molecular structures of two (2 and 3) of the complexes were confirmed by single crystal X-ray diffraction, and the complexes adopted pseudo-octahedral geometry around Ru. Catalytic ability of the Ru complexes was evaluated in the synthesis of quinoxaline compounds from various 2-nitroaniline and hydroxy ketone derivatives via transfer hydrogenation approach. Active homogeneous catalyst was heterogenized by supporting it on graphene oxide, and the heterogeneous equivalent was characterized by Raman, XPS, TEM, SEM and ICP-OES techniques. Activity of the heterogeneous catalyst was tested, and it can be reused up to five cycles without any loss in activity.
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ISSN: | 0022-328X 1872-8561 |
DOI: | 10.1016/j.jorganchem.2021.121933 |