TY - EJOUR
AU - Saied, Shakir Mahmood
AU - Saleh, Mohanad Yakdhan
AU - Hamdoon, Ahmed M.
PY - 2024
DA - January
TI - Multicomponent Synthesis of Tetrahydrobenzo[a]xanthene and Tetrahydrobenzo[a]acridine Derivatives using Sulfonated Multi-Walled Carbon Nanotubes as Heterogeneous Nanocatalysts
T2 - Iranian Journal of Catalysis
VL - 12
L1 - https://oiccpress.com/iranian-journal-of-catalysis/article/multicomponent-synthesis-of-tetrahydrobenzoaxanthene-and-tetrahydrobenzoaacridine-derivatives-using-sulfonated-multi-walled-carbon-nanotubes-as-heterogeneous-nanocatalysts/
DO - 10.30495/ijc.2022.1955651.1924
N2 - This study is the first report of the application of sulfonated multi-walled carbon nanotubes (MWCNTs-SO3H) in the synthesis of tetrahydrobenzo[a]xanthene and tetrahydrobenzo[a]acridine derivatives. The catalyst was prepared via a chemical approach and the sulfonated groups were attached to the side-wall of MWCNTs with total density of 2.58 mmol.g-1. In order to prove functionalization of the MWCNTs-SO3H, the catalyst was characterized using FE-SEM, TEM, FT-IR, and Raman spectroscopy techniques. A three-component reaction including 2-naphthol, dimedone, and aromatic aldehydes were applied in the synthesis of tetrahydrobenzo[a]xanthene in the presence of 15.5 mol% of MWCNTs-SO3H under solvent-free conditions. Also, a four-component reaction including 2-naphthol, dimedone, aromatic aldehydes, and ammonium chloride was used in the synthesis of tetrahydrobenzo[a]acridine in the presence of 12.9 mol% of MWCNTs-SO3H under solvent-free conditions. All the derivatives of tetrahydrobenzo[a]xanthene and tetrahydrobenzo[a]acridine were obtained in good to excellent yields. The MWCNTs-SO3H was reused in seven consequent catalytic cycles without loss of their catalytic activity. Highlights An efficient and reusable sulfonated multi-walled carbon nanotubes were prepared. MWCNTs-SO3H was used in the synthesis of tetrahydrobenzo[a]xanthene and tetrahydrobenzo[a]acridine. All of the reactions were performed under solvent-free conditions. The MWCNTs-SO3H was characterized using FE-SEM, TEM, FT-IR, and Raman spectroscopy. The catalyst could be reused for seven catalytic cycles. 
IS - 2
PB - OICC Press
KW - Xanthene. Acridine, Catalyst, Multicomponent, Carbon nanotubes, Heterogeneous 
EN -