Efficient and mild synthesis of pyrano-pyrimidines catalyzed by decorated multi-walled carbon nanotubes bearing cobalt, nickel and copper metals in water

Mapping Intimacies ◽

10.21203/rs.3.rs-932673/v1 ◽

2021 ◽

Author(s):

Nasrin Saberi Harouni ◽

Hossein Naeimi

Keyword(s):

Reaction Times ◽

Single Step ◽

High Yield ◽

One Pot ◽

H Nmr ◽

Multi Walled Carbon Nanotubes ◽

Nmr Techniques ◽

One Step ◽

Ft Ir ◽

Walled Carbon Nanotubes

Abstract Multicomponent reactions are reactions in which three or more are agreeable of raw interests, composed in a one-step chemical process and the product is formed they give. Since multivariate reactions are monovalent reactions and Single-step conversions to ideal synthesis are very close. In this research, one pot three components reaction was carried out between 1, 3-dimethylbarbituric acid, malononitrile and different aldehydes in the attendance of Cu/Co/Ni/MWCNTs as a recyclable catalyst. This catalyst indicated high catalytic actuality with good proficiency and reusable under mild reservation. This reaction is performed fine at ambient temperature. This method proposed numerous materials such as being environmentally amicable for short reaction times and creating high yield products. The catalysts were collected and specified with diversity spectroscopic, such as techniques, such as FT-IR, X-ray fracture, and scanning electron microscopy. After finalization of the reaction, the vintage was obsolete, purified and identified by the melting points, infrared spectroscopy (FT-IR) and the magnetic resonance of the hydrogen nucleus (1H NMR) techniques.

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Six-Sided Heptaporphyrin Array: Towards a Nano-Sized Cube

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20040996 ◽

2004 ◽

Vol 69 (5) ◽

pp. 996-1008 ◽

Cited By ~ 13

Author(s):

Steven J. Langford ◽

Clint P. Woodward

Keyword(s):

Single Step ◽

One Pot ◽

H Nmr ◽

The Core ◽

Nmr Techniques ◽

Axial Vertex

A strategy in preparing a family of hexameric porphyrin cubes based on the interplay of Sn(IV)-O and Ru(II)-N interactions is described. In this first iteration, we have prepared the heptamer [SnIV(TPyP)·(4)2][Ru(CO)(TPP)]6 (4 = (E)-(3-(4-pyridyl)acrylate)) constituting a 5,10,15,20-tetra(4-pyridyl)porphyrin (TPyP) core and 5,10,15,20-tetraphenylporphyrin (TPP) faces and compared its formation by stepwise and "one-pot" strategies where up to nine components are assembled in a single step in a regiospecific manner. In one example, the heptamer is formed around the template [SnIV(TPyP)·(4)2] bearing pyridine groups in which the nitrogens radiate octahedrally along each vertex. The ability to modulate the axial vertex through choice of pyridine is also demonstrated. 1H NMR measurements on [SnIV(TPyP)·(4)2][Ru(CO)(TPP)]6 indicate that the protons on the core template are extremely shielded as a result of the anisotropy of the peripheral porphyrin units. Various NMR techniques, including NOESY experiments, have been used to characterise the heptamer in solution.

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One-Pot Hydrothermal Synthesis of MWCNT/ZrO2 Composites for Enhancing Electromagnetic Wave Absorption Performance

NANO ◽

10.1142/s1793292020500344 ◽

2020 ◽

Vol 15 (03) ◽

pp. 2050034

Author(s):

Honglong Xing ◽

Qingping Liu ◽

Ligang Zhang ◽

Ye Liu ◽

Mingqiang Hu

Keyword(s):

High Efficiency ◽

Hydrothermal Process ◽

Synthesis Methods ◽

One Pot ◽

Wave Absorption ◽

Multi Walled Carbon Nanotubes ◽

One Step ◽

Absorption Performance ◽

Walled Carbon Nanotubes ◽

Minimum Reflection Loss

Electromagnetic (EM) wave absorption materials have drawn a lot of attention because they can effectively reduce EM wave pollution from electronic equipment. In this work, we combined ZrO2 nanoparticles with multi-walled carbon nanotubes (MWCNTs) and explored applications of MWCNT/ZrO2 composites in EM wave absorbing field. ZrO2 nanoparticles with a high crystalline were synthesized by one-step hydrothermal method. Adding MWCNTs in this hydrothermal process, ZrO2 nanoparticles aggregated together to form uneven lumps and wraps on MWCNTs surfaces. MWCNTs improved the conductivity loss and electron polarization capability of composites. The minimum reflection loss (RL) of MWCNT/ZrO2 composites reached [Formula: see text]39.73 dB at a thickness of 2[Formula: see text]mm. Such excellent EM wave absorption properties are attributed to the dielectric loss, dipole polarizations and interfacial polarizations. This composite can be a promising candidate as high efficiency EM wave absorption material and used for commercial production because of the simple synthesis methods.

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An efficient synthesis of imidazo[2,1-b][1,3,4]thiadiazol-7-ium hydroxides by a one-pot, three-component reaction in water

Heterocyclic Communications ◽

10.1515/hc-2018-0117 ◽

2018 ◽

Vol 24 (6) ◽

pp. 297-302 ◽

Cited By ~ 1

Author(s):

Jabbar Khalafy ◽

Nasser Etivand ◽

Neda Khalillou

Keyword(s):

Reaction Times ◽

Sulfamic Acid ◽

One Pot ◽

Green Protocol ◽

H Nmr ◽

Three Component Reaction ◽

Ft Ir ◽

High Yields ◽

Reaction In Water ◽

C Nmr

Abstract An improved synthesis of 2-ethyl-5-(2-hydroxy-4-oxoquinolin-3(4H)-ylidene)-6-aryl-5,6-dihydroimidazo[2,1-b][1,3,4]thiadiazol-7-ium hydroxide derivatives 4a–k via the reaction of aryl glyoxal monohydrates 1a–k, quinoline-2,4-diol 2 and 2-amino-[1,3,4]thiadiazole (3) in the presence of Et3N/sulfamic acid in H2O is described. This green protocol is characterized by the use of the readily available catalyst and reactants, short reaction times, operational simplicity and high yields of products. The structures of all compounds were characterized by 1H NMR, 13C NMR and Fourier-transform infrared (FT-IR) spectral data and microanalyses.

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NiFe2O4@SiO2 nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4- triazazolidine-3-ones (thiones)

Current Organic Synthesis ◽

10.2174/1570179417666200924150004 ◽

2020 ◽

Vol 17 ◽

Author(s):

Mohammad Nikpassand ◽

Zahra Pourkarim

Keyword(s):

Electron Microscope ◽

Reaction Times ◽

High Yield ◽

Reusable Catalyst ◽

One Pot ◽

X Ray ◽

Transmission Electron ◽

Elemental Analyses ◽

Ft Ir ◽

High Yields

Introduction: NiFe2O4@SiO2nPr@glucose catalyzed synthesis of novel 5-pyrazolin-1,2,4-triazazolidine-3- ones (thiones). Materials and Methods: Amino glucose‐ functionalized silica‐ coated NiFe2O4 nanoparticles (NiFe2O4@SiO2 nPr@glucose amine or NiFe2O4@SiP@GA) were synthesized and characterized by X-ray powder diffraction (XRD), X-ray spectroscopy (EDX), transmission electron microscope (TEM), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometry (VSM) and fourier transform infrared spectroscopy (FT-IR). Results and Discussion: NiFe2O4@SiP@GA supply an eco-friendly procedure for the synthesis of some novel 5- pyrazolin-1,2,4-triazazolidine-3-ones or thiones through one-pot reaction of thiosemicarbazide (hydrazinecarbothioamide) and synthetized pyrazole carbaldehydes. These compounds were obtained in high yields in short reaction times. The catalyst could be easily recovered and reused for six cycles with almost consistent activity. The structures of the synthesized 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones were confirmed by 1H NMR, 13C NMR and FTIR spectral data and elemental analyses. Conclusion: In conclusion, we have investigated NiFe2O4@SiO2nPr@amino glucose as a new, eco-friendly, inexpensive, mild and reusable catalyst for the synthesis of 5-pyrazolin-1,2,4-triazazolidine-3-ones or thiones. High yield, a simple work‐ up procedure, adherence to the basics of green chemistry, environmental friendly and based on natural ingredients, ease of separation and recyclability of the magnetic catalyst and waste reduction are some advantages of this method.

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Nucleobase-Based Barbiturates: Their Protective Effect against DNA Damage Induced by Bleomycin-Iron, Antioxidant, and Lymphocyte Transformation Assay

BioMed Research International ◽

10.1155/2014/898670 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

Bhaveshkumar D. Dhorajiya ◽

Bharatkumar Z. Dholakiya ◽

Ahmed S. Ibrahim ◽

Farid A. Badria

Keyword(s):

Dna Damage ◽

Protective Effect ◽

Uv Spectroscopy ◽

Lymphocyte Transformation ◽

High Yield ◽

One Pot ◽

H Nmr ◽

Transformation Assay ◽

Ft Ir ◽

C Nmr

A number of nucleobase-based barbiturates have been synthesized by combination of nucleic acid bases and heterocyclic amines and barbituric acid derivatives through green and efficient multicomponent route and one pot reaction. This approach was accomplished efficiently using aqueous medium to give the corresponding products in high yield. The newly synthesized compounds were characterized by spectral analysis (FT-IR,1H NMR,13C NMR, HMBC, and UV spectroscopy) and elemental analysis. Representative of all synthesized compounds was tested and evaluated for antioxidant, bleomycin-dependent DNA damage, and Lymphocyte Transformation studies. CompoundsTBC>TBA>TBGshowed highest lymphocyte transformation assay,TBC>TBA>BGshowed inhibitory antioxidant activity using ABTS methods, andTBC>BPA>BAMT>TBA>1,3-TBAmanifested the best protective effect against DNA damage induced by bleomycin.

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Synthesis of Highly Functionalized Quinazoline-2,4(1H,3H)-diones from Isocyanides, Aniline and Isocyanate via Cu-Catalyzed Intermolecular C-H Activation Reactions

Letters in Organic Chemistry ◽

10.2174/1570178616666190905142545 ◽

2020 ◽

Vol 17 (11) ◽

pp. 832-836

Author(s):

Manijeh Nematpour ◽

Hossein Fasihi Dastjerdi ◽

Mehdi Jahani ◽

Sayyed Abbas Tabatabai

Keyword(s):

13C Nmr ◽

Reaction Times ◽

High Yield ◽

One Pot ◽

1H And 13C Nmr ◽

Activation Reaction ◽

Elemental Analyses

A simple and appropriate procedure for the synthesis of quinazoline-2,4(1H,3H)-dione derivatives from isocyanides, aniline and isocyanate via the Cu-catalyzed intramolecular C-H activation reaction is reported. The advantages of this method are one-pot conditions, accessible starting materials- catalyst, high yield of products, and short reaction times. The structures are confirmed spectroscopically (1H- and 13C-NMR, IR and EI-MS) and by elemental analyses.

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Ultrasound-assisted aqua-mediated synthesis of multi-substituted tetrahydropyridine-3-carboxylates using N-carboxymethyl-3-pyridinium hydrogensulfate ([N-CH2CO2H-3-pic]+HSO4−) as a new efficient ionic liquid catalyst

SN Applied Sciences ◽

10.1007/s42452-021-04671-9 ◽

2021 ◽

Vol 3 (6) ◽

Author(s):

Kobra Nikoofar ◽

Fatemeh Shahriyari

Keyword(s):

Ionic Liquid ◽

Reaction Times ◽

Aromatic Aldehydes ◽

Environmentally Benign ◽

H Nmr ◽

Sonic Waves ◽

Ft Ir ◽

High Yields ◽

Work Up ◽

C Nmr

AbstractA simple, straightforward, and ultrasound-promoted method for the preparation of some highly functionalized tetrahydropyridines reported via pseudo five-component reaction of (hetero)aromatic aldehydes, different anilines, and alkyl acetoacetates in the presence of [N-CH2CO2H-3-pic]+HSO4−, as a novel ionic liquid, in green aqueous medium. The IL was synthesized utilizing simple and easily-handled substrates and characterized by FT-IR, 1H NMR, 13C NMR, GC-MASS, FESEM, EDX, and TGA/DTG techniques. The procedure contains some highlighted aspects which are: (a) performing the MCR in the presence of aqua and sonic waves, as two main important and environmentally benign indexes in green and economic chemistry, (b) high yields of products within short reaction times, (c) convenient work-up procedure, (d) preparing the new IL via simple substrates and procedure.

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