Abstract
AbstractFe3O4@nano‐almondshell@OSi(CH2)3/2‐(1‐piperazinyl)ethylamine/Zn(II) abbreviated (FNAOSiPPEA/Zn(II)) as a Lewis acid/ Bronsted base double‐layer magnetic nano‐catalyst was prepared by immobilization of Zn‐diamine complex on functionalized nano‐almondshell coated Fe3O4 NPs. The properties of the FNAOSiPPEA/Zn(II) nano‐catalyst were identified by the of FT‐IR, FESEM, TGA, EDS‐MAP, XRD, VSM, and BET techniques. The catalytic performance of FNAOSiPPEA/Zn(II) as a strong and effective Lewis acid for the synthesis of 2‐aryl(alkyl)‐2,3‐dihydro‐1H‐naphtho[1,2‐e][1,3]oxazine derivatives, abbreviated ADNO, was evaluated. A three‐component reaction between formaldehyde, primary amines, and phenolic compounds such as β‐naphthol, α‐naphthol, phenol, and hydroquinone was occurred in this protocol. FNAOSiPPEA/Zn(II) can be reused four times with a slight loss of catalytic activity.
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