Iranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701One-pot and one-step novel N-methylation of 2,6-diaminopyridine162167661ENMehdiNabatiChemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, IranMehrdadMahkamChemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, IranJournal Article201402062,6-diaminopyridine is extensively used as a pharmaceutical intermediate and a hair dye coupler as oxidation formulations. It is soluble in protic solvents. Primary and secondary amines are N-methylated by various methods such as direct alkylation of amines with Hofmann mechanism, but in many of these methods due to overalkylations, we earn a mixture of amino products. Consequently, they aren't selective in secondary amines preparation. Also, the selective synthesis of secondary amines is a problematic field in organic chemistry. 2,6-diaminopyridine can be selective N-methylated from reaction of this compound with sodium azide and orthoformic ester in low time with good yields.https://icc.journals.pnu.ac.ir/article_661_e6ca20532f0d3d6c78ee428ab422e7f6.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 4201407011-Carboxymethyl-3-methylimidazolium chloride {[cmmim]Cl} as an efficient catalyst for the solvent-free synthesis of bis(indolyl)methanes168172513ENAhmad RezaMoosavi-ZareDepartment of Chemistry, University of Sayyed Jamaleddin Asadabadi,
Asadabad, 6541835583, Iran.MahdiPouraskar-BorazjaniDepartment of Chemistry, Payame Noor University, IranZahraNazbDepartment of Chemistry, Payame Noor University, IranJournal Article201310261-Carboxymethyl-3-methylimidazolium chloride {[cmmim]Cl} is utilized as a highly efficient and reusable catalyst for the synthesis of bis(indolyl)methanes by the condensation reaction of indole with arylaldehydes under solvent-free conditions at room temperature. In summary, the presented method have several advantages including simplicity, low cost, generality, efficiency, clean reaction profile, high yield, short reaction time, ease of product isolation, mild reaction conditions, and good agreement with the green chemistry protocols. In this work, all aldehydes, including benzaldehyde and arylaldehydes possessing electron-withdrawing substituents, electron-releasing substituents and halogens on their aromatic ring, afforded the desired bis(indolyl)metanes in high to excellent yields and in short reaction times.https://icc.journals.pnu.ac.ir/article_513_0753ee8138a9d0eb7e20762e7b60a4e0.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701Effects of structure and number of Heteroatom on the π-π stacking interactions of benzene with N-substituted coronenes: A theoretical study173179749ENPouyaKarimiDepartment of Chemistry, Faculty of science
University of Zabol, Zabol, IranMahmoudSanchooliDepartment of Chemistry, Faculty of science,
University of Zabol, Zabol, IranJournal Article20140129Stability of the π-π stacking interactions in the Ben||N-substituted-coronene complexes was studied using the computational quantum chemistry methods (where Ben is benzene and || denotes π-π stacking interaction, and N-substituted-coronene is coronene molecule which substituted with different number of N atoms). The results reveal simultaneous effects of structure and number of Heteroatom on the π-π stacking interactions with N-substituted-coronenes. Changing the number of Heteroatom N in N-substituted-coronenes and substitution of 8N-coronene with electron-withdrawing or electron-donating X groups alter the electron charge density at rings of this molecule and leads to different binding energies in the Ben||X-8N-substituted-coronene complexes. Results indicate that electron-withdrawing groups lead to higher π–π stacking binding energies compared to electron-donating ones in the Ben||X-8N-substituted-coronene complexes.https://icc.journals.pnu.ac.ir/article_749_3dbc0817bd9449295fdf2500432705a7.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701Ag nanoparticle/melamine sulfonic acid supported on silica gel as an efficient catalytic system for synthesis of dihydropyrimidin thiones180186778ENParyaNasehiDepartment of chemistry, Science and Research Branch, Islamic Azad University, Ahvaz, IranAlirezaKiasatDepartment of chemistry, Science and Research Branch, Islamic Azad University, Ahvaz, IranMohammad KazemMohammadiIslamic Azad University , Ahvaz BranchJournal Article201401143,4-dihydropyrimidin-2(1H)-thiones were synthesized in the presence of Ag nanoparticle/melamine sulfonic acid (MSA) supported on silica gel. The reaction was carried out at 110 oC for 20 min under solvent free conditions. In all cases, the three component reaction proceeded smoothly to give the corresponding 3,4-dihydropyrimidin-2(1H)-thiones in moderate to good yield. We have found the best conditions are using 0.2 g MSA, 0.05 g Ag nanoparticle.SiO2 under solvent free conditions at 110 oC. This method have some advantages such as good yield, mild reaction conditions, ease of operation and work up, short reaction time and high product purity. In this work, we have investigated the application of Ag nanoparticle/MSA.SiO2 for synthesis of Biginelli – type condensation.https://icc.journals.pnu.ac.ir/article_778_c682a797f1c3b0ae09c658e4213392ec.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701Caesium carbonate as a highly efficient catalyst for the synthesis of macrocyclic diamides187195782ENEsmaelRostamiDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranMaryamBagherzadehDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranAkramKhodadadiDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranAy SodaGhobadpoorDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranFatemehDehghaniDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranZahraHeidariDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranMahmoodFeraidooniDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranZahraAbshiriniDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranFatemehTavazoDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranZahraKeshvarzDepartment of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, IranJournal Article20140215In this research work, we report the synthesis of macrocyclic diamides from the reaction of diesters and aliphatic diamines in the presence of caesium carbonate. It has been demonstrated that among the carbonate of alkali metals (Li2CO3, Na2CO3, K2CO3 and CS2CO3), CS2CO3 appear to be the best catalyst for macrocyclization. Diesters with different substitution patterns on the aromatic ring reacted smoothly with diamines under optimal conditions, affording the corresponding macrocycles in high yields. Introducing a rigid group (e.g., sulfone) on the substrate led to somewhat decreased yield. Various substrates proved to be suitable for this macrocyclization reaction, especially, the flexible ones.https://icc.journals.pnu.ac.ir/article_782_c4b49d2f055b63cf134cced2c9d9fd58.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701Synthesis, characterization and swelling behavior investigation of gelatin-g-Poly(Acrylic Acid-co-Itaconic Acid)196208788ENHosseinHosseinzadehPayame Noor UniversityMojtabaAbbasianPayame Noor UniversityShadiHassanzadehPayame Noor UniversityJournal Article20140227A novel pH-responsive superabsorbent hydrogel based on gelatin was prepared through crosslinking copolymerization of poly (acrylic acid) and poly (itaconic acid). The copolymerization conditions including monomers, initiator, gelatin and crosslinker concentration, reaction temperature, and neutralization percent were systematically optimized to achieve a hydrogel with swelling capacity as high as possible. The hydrogels structure was confirmed using Fourier-transform infrared, thermogravimetric analysis, differential scanning calorimetric and scanning electron microscopy. The swelling of the superabsorbing hydrogel was examined in buffer solutions with pH ranged 3-12. Moreover, the swelling of the hydrogel was conducted in 0.15 M aqueous solutions of NaCl, CaCl2, and AlCl3. Due to the high swelling capacity in salt solutions, the hydrogel may be referred to as "low-salt sensitive" superabsorbent.https://icc.journals.pnu.ac.ir/article_788_62cf10b14ffb7b3a239a3796e4800b64.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701The computational study of adsorption of carbon monoxide on pristine and Ge-doped (6,0) zigzag models of BNNTs209221789ENMahdiRezaei SametiPhysical chemistry departement, Facualty scienceNinaAlisafarzadehDepartment of Applied Chemistry, Faculty of Science, Malayer University, Malayer, 65174, IranJournal Article20140116The aim of this research is studying the effects of Ge-doped on CO adsorption on the outer and inner surfaces of (6, 0) zigzag model of boron nitride nanotube (BNNTs) by using DFT theory. For this purpose, eight models of CO adsorption on the surfaces of BNNTs are considered. At first step, all structures were optimized at B3LYP and 6-31G (d) standard base set and then the electronic structure, adsorption energy, HOMO - LUMO orbitals, gap energy, quantum molecular descriptors, and NQR parameters were determined. The bond lengths neighborhood sites of Ge-doped of BNNTs at all models were increased and the bond angles decreased. The small adsorption energy value and large interaction distance show that the adsorption of CO on BNNTs is weakly physical adsorption due to weak Van der Waals interaction. Our calculated results show that the adsorption of CO on the surface of undoped models is more favorable than Ge-doped models. The NQR parameters of the first layer in all the models are larger than those other layers.https://icc.journals.pnu.ac.ir/article_789_e4c984d1507f5dcb898fdcde5c9836a2.pdfIranian chemical communication2423-49582Issue 3, pp. 162-231, Serial No. 420140701The effect of sulfuric acid on pore initiation in anodic alumina formed in oxalic acid222231790ENBehnamHafeziFaculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj P. O. Box 31745-139, Iran.Journal Article20140308In this work, a tracer study on pore initiation in anodic alumina in oxalic acid was performed. Effects of some experimental parameters such as applied electrical potential, electrolyte composition and heat pretreatment were evaluated. Electrochemical and morphological experiments were performed using potentiostatic anodizing and scanning electron microscopy (SEM) techniques, respectively. Effect of electrolyte composition on current density was discussed. In various electrical potentials, electrolyte composition had different effects on current density. Addition of sulfuric acid into oxalic acid increased porosity. Also, distribution of pore size and pore diameter were influenced by presence of sulfuric acid. Effect of electrolyte composition on the morphology of aluminum surface layer was depended on to the electric potential. Current density and porosity of aluminum surface layer was decreased by heat pretreatment.https://icc.journals.pnu.ac.ir/article_790_355529e69300186646df1244dbd93491.pdf