Dendrimer-Functionalized Magnetic Graphene Oxide for Knoevenagel Condensation

Maleki, Behrooz; Taheri, Fatemeh; Tayebee, Reza; Adibian, Fatemeh

doi:10.1080/00304948.2021.1875799

Cited by 20 publications

(7 citation statements)

References 50 publications

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“…Many efforts have been made on the heterogenization of copper catalysts on the surface of different supports, including mesoporous materials ( Costa et al, 2021 ), functionalized polymers ( Chaudhary and Sharma, 2021 ), resins ( Xiong et al, 2021 ), carbon nanotubes ( Şen and Gokagac, 2007 ; Mohd Nurazzi et al, 2021 ), and silica ( Farhadian et al, 2021 ). However, few works have reported on using graphene oxide (GO) as support for the attachment of this type of catalyst and its catalytic performance ( Maleki et al, 2021 ; Rezaei-Seresht et al, 2021 ; Boroumand et al, 2022 ; Laffafchi et al, 2022 ). Compared with different supports, GO is an appealing two-dimensional carbon-based material with attractive properties like mechanical stability and excellent thermal stability ( Khojastehnezhad et al,2019 ; Lee et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Efficient preparation of graphene oxide-immobilized copper complex and its catalytic performance in the synthesis of imidazoles

2023

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This paper focused on the synthesis of phenylthiocarbamide-grafted graphene oxide (GO)-supported Cu complex (Cu-PTC@GO) as a highly efficient and recyclable catalyst synthesis by various analytical techniques such as TG, FT-IR, XRD, BET, N2 adsorption–desorption isotherms, SEM, EDX, and elemental mapping analysis. Cu-PTC@GO showed outstanding results in preparing various imidazoles with higher yields, reduced reaction time, ease of product separation, and a simple procedure. In addition, the catalyst demonstrated appreciable recyclability up to five successive runs, and there was no substantial loss in catalytic performance. The result indicated that the heterogeneous base GO catalyst performed high activity and excellent recyclability in synthesizing various imidazoles and their derivatives, owing to the unique state of the GO-supported copper complex.

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Section: Introductionmentioning

confidence: 99%

Efficient preparation of graphene oxide-immobilized copper complex and its catalytic performance in the synthesis of imidazoles

2023

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“…[12] A large number of functional groups on GO basal plane allow for the modification of GO for further applications. [13] The multifunctional flexibility of these functional groups facilitates the interaction between the host materials and GO, resulting in intercalation or cross-linking with primary aliphatic amines, amino acids, diaminoalkanes, isocyanates, etc.. [14] So, the surface area and consequently the catalytic activity of these catalysts could be improved with high exposure of the catalysts toward the organic compounds. [15] In most current studies, the carboxylic acid groups in GO were activated by thionyl chloride.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon nanomaterials especially GO are widely under investigation due to their large scale availability, easy surface modification, and non‐toxicity [12] . A large number of functional groups on GO basal plane allow for the modification of GO for further applications [13] . The multifunctional flexibility of these functional groups facilitates the interaction between the host materials and GO, resulting in intercalation or cross‐linking with primary aliphatic amines, amino acids, diaminoalkanes, isocyanates, etc.…”

Section: Introductionmentioning

confidence: 99%

GO Treated with Aminoethyl‐Piperazine as a Reusable and Eco‐friendly Organocatalyst for Synthesis of Some Xanthen and Pyran Derivatives

Khabnadideh

2023

ChemistrySelect

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Graphene Oxide (GO) containing 1‐(2‐aminoethyl) piperazine as a reusable, highly efficient and heterogeneous organocatalyst was prepared using a simple and green way. Epoxide groups on the surface of GO layers were replaced with 1‐(2‐aminoethyl) piperazine by an easy and green technique in a mild condition. The prepared catalyst (GO‐A.P.) was characterized using diverse microscopic and spectroscopic techniques. The presence of organic functional groups on the surface of GO‐A.P. was confirmed by Fourier transform infrared and Raman spectroscopy. X‐ray diffraction analysis showed an increase in the catalyst's interlayer spaces which confirm the successful presence of 1‐(2‐aminoethyl) piperazine molecules on the GO surface. Also interaction between the organic molecules and GO was established by thermogravimetric analysis via weight loss steps. Then, the capability of this catalyst was evaluated in a three‐component coupling reaction for one‐pot synthesis of 12‐aryl‐8,9,10,12‐tetrahydrobenzo[a]xanthen‐11‐one (A1–A7) and also 2‐amino‐4H‐pyrans (B1–B8) derivatives. The target products were obtained in high isolated yields. Furthermore, our catalyst was reusable at least for 5 runs with no significant decrease in its activity.

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“…Multicomponent reactions (MCRs), as a clean, effective, and green route for the synthesis of organic compounds, gain the most attention in synthetic methodologies. [24][25][26][27][28][29][30] In this study, multicomponent synthesis of three kinds of spirooxindoles through a new method is presented.…”

Section: Introductionmentioning

confidence: 99%

“…Obtained catalyst (NGO/PMA) was used for multicomponent preparation of some spirooxindoles under green conditions (Scheme 1). Multicomponent reactions (MCRs), as a clean, effective, and green route for the synthesis of organic compounds, gain the most attention in synthetic methodologies 24–30 . In this study, multicomponent synthesis of three kinds of spirooxindoles through a new method is presented.…”

Section: Introductionmentioning

confidence: 99%

Green pathway to the synthesis of some spirooxindole derivatives using NGO/PMA as a new and effective solid acid catalyst

Palizi,

Moradi

2023

Applied Organom Chemis

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Heteropoly acids as nontoxic, dual Lewis–Brønsted acids with high thermal stability can develop acid‐catalyzed reactions. Combining these catalysts with other materials is of great interest to enhance their efficiency and capability. Despite all the outstanding properties of heteropoly acids, their solubility in water and most organic solvents limits their application. So, in presented research, immobilization of phosphomolybdic acid (PMA) on prepared N‐doped graphene oxide (NGO/PMA) was done to synthesize a solid acid, green and effective catalyst for the multicomponent synthesis of three kinds of spirooxindole structures. The preparation of new NGO‐based solid acid catalyst was performed through a three‐step method and identified by FTIR, TEM, mapping elemental analysis, SEM, EDX, and XRD techniques. Reusability of the catalyst, short reaction times (1:20–2 h), green condition, and easy workup as well as high yield of products (90–95%) are some merits of this research.

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Dendrimer-Functionalized Magnetic Graphene Oxide for Knoevenagel Condensation

Cited by 20 publications

References 50 publications

Efficient preparation of graphene oxide-immobilized copper complex and its catalytic performance in the synthesis of imidazoles

Efficient preparation of graphene oxide-immobilized copper complex and its catalytic performance in the synthesis of imidazoles

GO Treated with Aminoethyl‐Piperazine as a Reusable and Eco‐friendly Organocatalyst for Synthesis of Some Xanthen and Pyran Derivatives

Green pathway to the synthesis of some spirooxindole derivatives using NGO/PMA as a new and effective solid acid catalyst

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