Loading…

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...

Full description

Saved in:
Bibliographic Details
Published in:Journal of organometallic chemistry 2021-09, Vol.949, p.121933, Article 121933
Main Authors: Sindhuja, Dharmalingam, Gopiraman, Mayakrishnan, Vasanthakumar, Punitharaj, Bhuvanesh, Nattamai, Karvembu, Ramasamy
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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. [Display omitted]
ISSN:0022-328X
1872-8561
DOI:10.1016/j.jorganchem.2021.121933