期刊
MONATSHEFTE FUR CHEMIE
卷 150, 期 6, 页码 1111-1119出版社
SPRINGER WIEN
DOI: 10.1007/s00706-019-02418-2
关键词
MWCNTs@SiO2/SO3H; Amidoalkyl naphthols; Multicomponent reaction; Solvent-free; Green protocol; Solid acid catalyst
资金
- University of Kashan [784946]
Multiwalled carbon nanotubes (MWCNTs) were modified with sulfonic acid groups through a new method. In the first step, MWCNTs' surfaces were hydroxylated using KMNO4 as oxidating agent and a surfactant (TPABr). Second, SiO2-coated MWCNTs were prepared through the reaction of hydroxylated CNTs with tetraethyl orthosilicate, and in last step, MWCNTs@SiO2/SO3H was prepared using the reaction of MWCNTs@SiO2 with ClSO3H. Obtained catalyst was used as efficient solid acid catalyst for one-pot three-component condensation reaction of 2-naphthol, benzaldehyde, and amide derivatives to afford the corresponding amidoalkyl naphthols. The reaction was performed under solvent-free conditions and products were obtained in high to excellent yields (80-98%). Prepared solid acid catalyst was characterized using FT-IR, BET, TGA, SEM, and EDX techniques. Presented methodology has several advantages such as simple procedure, excellent yields of products, effective reusable solid acid catalyst, and eco-friendly reaction conditions.
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