FNAOSiPPEA~([**])/Zn(II)as a Bifunctional Lewis Acid/Bronsted Base Heterogeneous Magnetic Nanocatalyst Based on Nano-Almond Shell for Synthesis of Naphtho[1,3] oxazine Derivatives

摘要

Fe3O4@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.