Green approach for the synthesis of carboxycoumarins by using a highly active magnetically recyclable nanobiocomposite via sustainable catalysis

Abstract

An efficient approach was reported for the synthesis of substituted 3-carboxycoumarins via a Knoevenagel condensation reaction between Meldrum's acid and substituted salicylaldehydes in the presence of a magnetic cellulose/Ag catalyst in EtOH at room temperature. This protocol includes many advantages such as remarkable magnetic properties of the nanobiocomposite catalyst, short reaction times, high yields and simple isolation of the organic products. In addition, the nanostructure catalyst can be easily separated from the reaction mixture and reused several times efficiently. Fourier transform infrared spectra, nuclear magnetic resonance spectra, X-ray diffraction pattern and field emission scanning electron microscopy images were performed for the characterisation of the products and the nanocatalyst.

Metal‐based nanoparticles for bone tissue engineering

“…One of the most significant features of iron oxide nanoparticles is their catalytic activity in multicomponent reactions (Eivazzadeh‐Keihan, Radinekiyan, Maleki, Bani, & Azizi, 2020). Examples of iron oxide based NP composites include, Fe 3 O 4 @cellulose composite (Maleki & Kamalzare, 2014), chitosan supported Fe 3 O 4 nanoparticles (Rahimi, Safa, & Salehi, 2017, Rahimi, Shafiei‐Irannejad, Safa, & Salehi, 2018), cellulose‐based magnetic nanocomposite (Rahimi et al, 2017), CoFe 2 O 4 @B 2 O 3 ‐SiO 2 magnetic composite (Maleki, Aghaei, Hafizi‐Atabak, & Ferdowsi, 2017), cellulose/Fe 2 O 3 /Ag bionanostructure (Maleki, Ravaghi, & Movahed, 2018), Fe 3 O 4 /SiO 2 ‐OSO 3 H nanostructure (Yadegarian, Davoodnia, & Nakhaei, 2015), and magnetic cellulose/Ag nanobiocomposite (Maleki et al, 2017). Besides their catalytic activity, magnetic nanoparticles can be utilized in drug delivery by the application of eternal magnetic fields (Rahimi et al, 2018, Rahimi et al, 2019).…”

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe3O4/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

“…The agglomeration of nanoparticles during the catalytic reaction is one of their disadvantages . Separation of nanoparticles from the reaction medium using simple methods such as filtration and centrifugation is difficult . To overcome these difficulties, different solid supports such as TiO 2 , graphene, mesoporous materials, and Fe 3 O 4 were applied for the immobilization of metal nanoparticles and the construction of the heterogeneous nanocatalyst .…”

“…[12][13][14][15][16] Separation of nanoparticles from the reaction medium using simple methods such as filtration and centrifugation is difficult. [17][18][19][20] To overcome these difficulties, different solid supports such as TiO 2 , graphene, mesoporous materials, and Fe 3 O 4 were applied for the immobilization of metal nanoparticles and the construction of the heterogeneous nanocatalyst. [21][22][23][24][25][26][27][28][29][30][31][32] Graphene oxide (GO) has been identified as a new group of interesting catalysts because of their unique properties such as good stability, large surface area, high mechanical strength, and good adsorption capacity.…”

Zinc(II)‐poly(urea‐formaldehyde) supported on magnetic nanoparticles: A hybrid nanocatalyst for green synthesis of spiropyrans, spiroxanthenes, and spiropyrimidines

“…[ 10 ] In addition, they can be used as catalysts in chemical processes. [ 11–21 ] As a result, ferrite spheres with hollow structures have many practical applications in the fields of catalysis, adsorbents, and gas sensors and attract much attention from researchers. [ 6 ] Cobalt ferrite can be used as magnetic support due to its moderate saturation magnetization, low cost, high chemical stability, and mechanical strength.…”