2024-03-28T18:33:09Z
https://icc.journals.pnu.ac.ir/?_action=export&rf=summon&issue=138
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
One-pot and one-step novel N-methylation of 2,6-diaminopyridine
Mehdi
Nabati
Mehrdad
Mahkam
2,6-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.
2,6-diaminopyridine
N-methylation
selectivity
one-pot reaction
2014
07
01
162
167
https://icc.journals.pnu.ac.ir/article_661_e6ca20532f0d3d6c78ee428ab422e7f6.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
1-Carboxymethyl-3-methylimidazolium chloride {[cmmim]Cl} as an efficient catalyst for the solvent-free synthesis of bis(indolyl)methanes
Ahmad Reza
Moosavi-Zare
Mahdi
Pouraskar-Borazjani
Zahra
Naz
1-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.
1-Carboxymethyl-3-methylimidazolium chloride {[cmmim]Cl}
imidazolium salt
bis(indolyl)methane
indole
arylaldehyde
solvent-free
2014
07
01
168
172
https://icc.journals.pnu.ac.ir/article_513_0753ee8138a9d0eb7e20762e7b60a4e0.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
Effects of structure and number of Heteroatom on the π-π stacking interactions of benzene with N-substituted coronenes: A theoretical study
Pouya
Karimi
Mahmoud
Sanchooli
Stability 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.
π-π stacking interaction
benzene
N-substituted-coronene
electron charge density
binding energy
2014
07
01
173
179
https://icc.journals.pnu.ac.ir/article_749_3dbc0817bd9449295fdf2500432705a7.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
Ag nanoparticle/melamine sulfonic acid supported on silica gel as an efficient catalytic system for synthesis of dihydropyrimidin thiones
Parya
Nasehi
Alireza
Kiasat
Mohammad Kazem
Mohammadi
3,4-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.
Nanoparticle melamine sulfonic acid.SiO2
Biginelli reaction
3
4-dihydropyrimidin-2(1H)-thione
solvent free
2014
07
01
180
186
https://icc.journals.pnu.ac.ir/article_778_c682a797f1c3b0ae09c658e4213392ec.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
Caesium carbonate as a highly efficient catalyst for the synthesis of macrocyclic diamides
Esmael
Rostami
Maryam
Bagherzadeh
Akram
Khodadadi
Ay Soda
Ghobadpoor
Fatemeh
Dehghani
Zahra
Heidari
Mahmood
Feraidooni
Zahra
Abshirini
Fatemeh
Tavazo
Zahra
Keshvarz
In 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.
Macrocyclic diamide
aza oxa thia crown
Synthesis
macrocycle and caesium carbonate (CS2CO3).
________________________________________
2014
07
01
187
195
https://icc.journals.pnu.ac.ir/article_782_c4b49d2f055b63cf134cced2c9d9fd58.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
Synthesis, characterization and swelling behavior investigation of gelatin-g-Poly(Acrylic Acid-co-Itaconic Acid)
Hossein
Hosseinzadeh
Mojtaba
Abbasian
Shadi
Hassanzadeh
A 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.
Superabsorbent
hydrogel
acrylic acid
itaconic acid
swelling behavior
2014
07
01
196
208
https://icc.journals.pnu.ac.ir/article_788_62cf10b14ffb7b3a239a3796e4800b64.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
The computational study of adsorption of carbon monoxide on pristine and Ge-doped (6,0) zigzag models of BNNTs
Mahdi
Rezaei Sameti
Nina
Alisafarzadeh
The 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.
Boron nitride nanotube
density function theory
adsorption CO
Ge-doped
NQR
2014
07
01
209
221
https://icc.journals.pnu.ac.ir/article_789_e4c984d1507f5dcb898fdcde5c9836a2.pdf
Iranian chemical communication
2423-4958
2423-4958
2014
2
Issue 3, pp. 162-231, Serial No. 4
The effect of sulfuric acid on pore initiation in anodic alumina formed in oxalic acid
Behnam
Hafezi
In 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.
Thin Films
anodized aluminum oxide
porosity
electrolyte composition
2014
07
01
222
231
https://icc.journals.pnu.ac.ir/article_790_355529e69300186646df1244dbd93491.pdf