36866-30-5Relevant academic research and scientific papers
H3PW12O40 supported on functionalized polyoxometalate organic-inorganic hybrid nanoparticles as efficient catalysts for three-component Mannich-type reactions in water
Khoshnavazi, Roushan,Bahrami, Leila,Havasi, Forugh,Naseri, Elham
, p. 11510 - 11521 (2017)
Two new types of catalyst were synthesized by the immobilization of H3PW12O40 (HPW12) on the surface of organic-inorganic polyoxometalate nanoparticles of H6Cu2[PPDA]6[SiW9Cu3O37]·12H2O (HybPOM) (PPDA = p-phenylenediamine) and Go/Fe3O4/HybPOM nanoparticles. These catalysts were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and alternating gradient force magnetometry (AGFM). The IR spectroscopy as well as XRPD reveal that HPW12 were immobilized on the support. The potentiometric titration with n-butylamine reveal that the catalysts can be classified as strong acids. The results show that the particles are mostly spherical in shape and have an average size in the range of 20-50 nm. The catalytic activities of the catalysts were probed through one-pot three-component Mannich-type reactions of aldehydes, amines and ketones in water at room temperature. The catalysts were re-used at least five times without any loss of their high catalytic activity.
H3PW12O40 anchored on graphene-grafted silica-coated MnFe2O4 as magnetic catalyst for Mannich reaction
Kooti,Kooshki,Nasiri,Sedeh, A. Naghdi
, p. 943 - 953 (2018/03/01)
In this study, a three-component nanocomposite consisted of graphene, manganese ferrite and phosphotungstic acid (PTA) has been prepared. This composite, which is designated as Graphene/MnFe2O4@PTA, was synthesized through anchoring of PTA–imidazolium ionic liquid on magnetic graphene sheets. The structural and magnetic properties of the fabricated nanocomposite were studied by employing FT-IR, SEM, EDX, TEM, ICP, VSM, P-XRD and BET techniques. The synthesized magnetic nanocomposite was examined as an efficient and recyclable acidic catalyst for Mannich reaction under solvent-free conditions. The products of this reaction, which are an important class of potentially bioactive compounds, were obtained with good to excellent yields, and the catalyst could be readily recycled without any significant loss of its activity.
Different ligand titanocenes complex crystal and its preparation of β - amino carbonyl compound in the application
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Paragraph 0042; 0043; 0044; 0045, (2017/12/28)
The invention discloses an isoligand cyclopentadiene-titanium coordination compound crystal and application thereof in preparing beta-amino carbonyl compounds. The structural formula of the cyclopentadiene-titanium coordination compound crystal is disclosed in the specification, and the cyclopentadiene-titanium coordination compound crystal is prepared from salicylic acid chelate and 3-thiophenic acid. The isoligand cyclopentadiene-titanium coordination compound crystal has the advantages of low price, no toxicity and high stability for air and water. The synthesis method has the advantages of cheap and accessible raw materials, simple and feasible synthesis steps, easy product after-treatment and high yield, and can implement gram-level preparation of the coordination compound. When being used as a cocatalyst for catalyzing the three-component Mannich reaction of cyclohexanone to prepare the beta-amino carbonyl compounds, the isoligand cyclopentadiene-titanium coordination compound crystal has the characteristics of high catalytic activity, high reaction selectivity, high product yield, no need of any solvent, simple operation process and high atom economy.
Graphene oxide catalytic preparation of β-amino carbonyl compounds method
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Paragraph 0011-0014; 0033-0036, (2019/02/04)
The invention discloses a method for preparing a beta-amido carbonyl compound through the catalysis of graphene oxide. The method comprises the following step of: directly compounding aromatic aldehyde, aromatic amine and aliphatic ketone under the catalytic action of the graphene oxide by taking water as a solvent to obtain the beta-amido carbonyl compound. According to the method, the used solvent is green and environment-friendly, and a used catalyst is low-cost, nontoxic and stable in the water and air. The preparation method disclosed by the invention is simple, convenient, moderate in reaction condition, short in reaction time and high in beta-amido carbonyl compound yield, and the catalyst, namely the graphene oxide, can be recycled after reaction is finished.
