One-pot synthesis of spirooxindole derivatives catalyzed by ZnFe2O4 as a magnetic nanoparticles
Hasan
Hasani
Department of Chemistry, Payam Noor University, Birjand, Iran
author
Mansoureh
Irizeh
Department of Chemistry, Payam Noor University, Birjand, Iran
author
text
article
2018
eng
ZnFe2O4 as a novel nanoparticle was prepared and characterized using x-ray diffraction (XRD) analysis, energy dispersive x-ray (EDX), vibrating sample magnetometry (VSM), and fourier-transform infrared (FTIR) spectra. Then, it is used one-pot three-components synthesis of spirooxindole derivatives via condensation of isatin, malononitrile, and 1,3-dicarbonyl compounds (1,3-cyclohexanedione) under mild reaction conditions in water as a green solvent. The present methodology offers several advantages, including ease of the preparation and handling of the catalyst, simple and easy work-up, short reaction times, high yields of the products and recyclability of the catalyst.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
85
95
https://www.ajgreenchem.com/article_54160_578ed2bb51b3a9d1ba466901fd1089b7.pdf
dx.doi.org/10.22631/ajgc.2017.101002.1025
Preparation and characterization of polyethylene glycol-bis(N-methylimidazolium) dihydroxide as a basic phase-transfer catalyst and its application in Knoevenagel condensation under aqueous media
Fariba
Poyafar
Department of Chemistry, Payame Noor University (PNU), 19395-3697, Tehran, Iran
author
Mehdi
Fallah-Mehrjardi
Department of Chemistry, Payame Noor University (PNU), 19395-3697, Tehran, Iran
author
Sayed Hossein
Banitaba
Department of Chemistry, Payame Noor University (PNU), 19395-3697, Tehran, Iran
author
text
article
2018
eng
A basic phase-transfer catalyst ([PEG(mim)2][OH]2) was prepared from the reaction of polyethylene glycol-bis(N-methylimidazolium) dibromide and sodium hydroxide dissolved in water at ambient temperature. The obtained white solid was used as an efficient basic phase-transfer catalyst in Knoevenagel condensation reactions between aromatic aldehydes and active methylene compounds in water at room temperature. The reaction is done without side products and in the presence of trace amounts of the catalyst gives the corresponding products with high yields. The phase-transfer catalyst could be successfully reused without significant decrease in its activity for at least five cycles.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
96
106
https://www.ajgreenchem.com/article_54478_f84d88b38d7e5afa082cdaf5f9d576c5.pdf
dx.doi.org/10.22631/ajgc.2017.109665.1043
Synthesis of carbohydrazide and using it for green synthesis of oxazol and a substitute for hydrazine in the deoxygenation of water supply from boilers
Narges
Ghasemi
National Petrochemical Company (NPC), petrochemical Research and Technology Company, Arak Center, Iran
author
text
article
2018
eng
Oxazole derivatives were prepared via multicomponent reaction of carbohydrazide, dialkyl acetylenedicarboxylate and ketone at room temperature under solvent-free conditions in good yields. One of the alternative materials for this reaction is carbohydrazide. In this study, in addition to introducing the properties and applications of this material as an oxidizing agent, synthesis of this compound from hydrazine has been investigated. The production process consists of two steps in which the first step involves the reaction of dimethyl carbonate with hydrazine to produced methylhydrazinocarboxylate and methanol. In the second stage, hydrazine is first added to the produced intermediate and finally carbohydrazide is produced using crystallization, filtration and drying. The results of the prepared sample analysis indicate the production of high purity carbohydrazide.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
107
114
https://www.ajgreenchem.com/article_55220_c6b23b608e627c36728366b7e72d027a.pdf
dx.doi.org/10.22631/ajgc.2018.109895.1044
Synthesis of benzo[f]chromeno[3,4-b]quinoline-6-ones and chromeno[3,4-b]quinoline-6,11-diones via one-pot three-component tandem Knoevenagel–Michael reaction catalyzed by n-Tetrabutylammonium tribromide
Deb
Das
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
author
Abhik
Choudhury
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
author
Abu Taleb
Khan
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
author
text
article
2018
eng
The synthesis of benzo[f]chromeno[3,4-b]quinoline-6-ones has been achieved via one-pot three-component reaction from substituted aromatic aldehydes, 3-aminocoumarins, and 2-naphthol in n-butanol using 10 mol % of N-tetrabutylammonium tribromide (TBATB) as catalyst under reflux condition. The product formation is going through tandem Knoevenagel–Michael reaction followed by concomitant cyclization. The most noteworthy features of the present protocol are environmentally benevolent reaction conditions, simplicity of procedure, high atom economy, easy accessibility of the catalyst, cost effectiveness and superior yields. In addition, TBATB has also been found to be an effective catalyst for synthesising chromeno[3,4-b]quinoline-6,11-diones from substituted aromatic aldehydes, 3-aminocoumarins and cyclic 1,3-diketones with better yields in shorter reaction time.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
115
131
https://www.ajgreenchem.com/article_55290_87b42cf975df68330237e308f5f176ef.pdf
dx.doi.org/10.22631/ajgc.2018.109090.1041
Transition metals as efficient catalysts for transesterification of Beta keto Esters under Solvent-free conditions
Pulusu
Vijayshekar
Department of Chemistry, Osmania University, Hyderabad, Telangana, 500072
author
Yelike
Hemanth Sriram
Department of Chemistry, Osmania University, Hyderabad, Telangana, 500072
author
Madhusudhan
Raju
Department of Chemistry, Osmania University, Hyderabad, Telangana, 500072
author
Routhu
Ajay kumar
Department of Chemistry, Kakatiya University, Warangal, Telangana, 506009
author
Kudle
Karunakar Rao
Department of Chemistry, Osmania University, Hyderabad, Telangana, 500072
author
text
article
2018
eng
Transition metals (ferrous ammonium sulphate and ammonium nickel sulphate) complexes have been proved to be efficient catalysts for transesterification of β-keto esters with various aromatic and hetero aromatic alcohols under solvent-free microwave conditions. However, in toluene media, the transesterification reaction was also conducted in both conventional reflux and sonication conditions, but, solvent-free condition microwave irradiation technique was found to be more efficient for transesterification with reduced reaction times and moderate yields. The inclination in reaction rates was found to be very less in solvent-free microwave assisted synthesis when compared to other conventional methods.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
132
143
https://www.ajgreenchem.com/article_57304_63e310c8de0cb1f2b63bf8a1f463197f.pdf
dx.doi.org/10.22631/ajgc.2018.108319.1039
Quantitative structure-retention relationships applied to chromatographic retention of ecotoxicity of anilines and phenols
Mehrdad
Shahpar
Director of Ilam Petrochemical Company, Ilam, Iran
author
Sharmin
Esmaeilpoor
Department of Chemistry, Payame Noor University, P.O. BOX 19395-4697, Tehran, Iran
author
text
article
2018
eng
Aniline, phenol, and their derivatives are widely used in industrial chemicals that consequently have a high potential for environmental pollution. Genetic algorithm and partial least square (GA-PLS), kernel partial least square (GA-KPLS) and Levenberg-Marquardt artificial neural network (L-M ANN) techniques were used to investigate the correlation between chromatographic retention (log k) and descriptors for modelling the toxicity to fathead minnows of anilines and phenols. Descriptors of GA-PLS model were selected as inputs in L-M ANN model. The described model does not require experimental parameters and potentially provides useful prediction for log k of new compounds. Finally a model with a low prediction error and a good correlation coefficient was obtained by L-M ANN. The stability and prediction ability of L-M ANN model was validated using external test set techniques.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
144
159
https://www.ajgreenchem.com/article_57478_12aea88fb1bb4695fd45ac98e69cc9a6.pdf
dx.doi.org/10.22631/ajgc.2018.100313.1023
Tribromo melamine (TBM) as an efficient and inexpensive catalyst for the one-pot synthesis of benzimidazoles and benzoxazole derivatives
Parisa
Shirkhani
Department of Chemistry, Faculty of Science, Ilam University, P.O. Box 69315516, Ilam, Iran
author
Hamed
Seifournia
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
Ehsan
Mirzajanzadeh
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
Marzieh
Rekavandi
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
Marziyeh
Sarayloo
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
Saeid
Afshari Sharif Abad
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
Zahra
Malkeshi
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
Sakineh
Rostamian Tuyehdarvary
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
author
text
article
2018
eng
In this work, a simple and facile method for the preparation of tribromo melamine (TBM or melamine‐Br3) as an environmentally friendly homogeneous catalyst is described as it is used for the one-pot synthesis of benzimidazoles and benzoxazole derivatives via condensation reactions between aromatic aldehydes and ortho‐phenylenediamine or ortho‐aminophenol in aqueous media conditions. This green method offers significant advantages in terms of its simplicity, high catalytic efficiency, good to excellent product yields, use of ethanol as a green solvent, mild conditions, eco-friendly, and in acceptable reaction times.
Asian Journal of Green Chemistry
Sami Publishing Company
2588-5839
2
v.
2
no.
2018
160
170
https://www.ajgreenchem.com/article_57683_b56701a16b6558a8c963a3d071b95682.pdf
dx.doi.org/10.22631/ajgc.2018.112963.1045