- Preparation of Fe3O4@C-dots as a recyclable magnetic nanocatalyst using Elaeagnus angustifolia and its application for the green synthesis of formamidines
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This work describes a novel and simple procedure for successfully synthesizing formamidines by using Fe3O4@C-dots in the role of an effective and reusable catalyst throughout a solvent-free set-up. The formamidine derivatives were easily prepared through aromatic amines with triethyl orthoformate in the company of Fe3O4@C-dots. According to the experimental outcomes, the obtained formamidines in the presence of Fe3O4@C-dots exhibited good to high yield values. In the following, we distinguished the prepared catalyst by applying field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and vibrating sample magnetometer (VSM) techniques. Furthermore, the evaluation of catalytic activity was done in the course of synthesizing formamidine derivatives. Among the advantages of this method, one can highlight the facts of solvent-free conditions, the simplicity of operation, high yields, nonacidic catalyst, and the reusability of nanocatalyst for at least five cycles.
- Ghereghlou, Mahnaz,Esmaeili, Abbas Ali,Darroudi, Majid
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- Catalyst-Free Synthesis of Aryl Diamines via a Three-Step Reaction Process
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The formation of C-N bonds with aryl amines is one of the most widely studied reactions in organic chemistry. Despite this, it is still highly challenging, often requiring expensive, precious metal-based catalysts. Here we report an easy catalyst-free methodology for constructing C-N bonds. The method, which proceeds via the in situ formation of closed ring amidinium ions, allows the preparation of a series of symmetrical and/or unsymmetrical aryl diamines in notably high yields (82-98%) and purity and with a variety of different substituents. The methodology is shown successful for the preparation of aryl diamines having para- and/or meta-substituted carboxyl, nitro, bromo, methoxy, or methyl groups. This green synthetic pathway, which is catalyst free, requires only three steps, and proceeds without the need for purification. Further, it is a new sustainable, economically viable method to achieve an otherwise challenging bond formation.
- Bulut, Safak,Queen, Wendy L.
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p. 3806 - 3818
(2018/04/14)
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