Resumo

MOHAMMADZADEH, Amin; MARJANI, Ahmad Poursattar  e  ZAMANI, Asghar. A Novel Biopolymer-based Nanomagnetic Catalyst for the Synthesis of 4H-pyran and Tetrahydro-4H-chromene Derivatives. S.Afr.j.chem. (Online) [online]. 2020, vol.73, pp.55-63. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2020/v73a9.

In the present study, we have designed and synthesized a new magnetically recoverable, nanocatalyst of Ag/Fe₃O₄@starch. The successful synthesis and the structure of the nanocatalyst were confirmed and evaluated with several analytical techniques including XRD, EDX, VSM, FT-IR, TEM and TGA. The impact and efficiency of Ag/Fe₃O₄@starch were successfully investigated in the one-pot synthesis of desired 4H-pyrans and tetrahydro-4H-chromenes using three-component condensation of various aldehydes, malononitrile, and 1,3-diketoesters or cyclic 1,3-diketones. The magnetic nanocatalyst was easily recovered and reused with high catalytic activity even after up to five runs.

Palavras-chave : Green synthesis; nanomagnetic; reusable nanocatalyst; starch; 4H-pyrans; tetrahydro-4H-chromenes.

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