ORIGINAL_ARTICLE
One-pot and one-step novel N-methylation of 2,6-diaminopyridine
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.
https://icc.journals.pnu.ac.ir/article_661_e6ca20532f0d3d6c78ee428ab422e7f6.pdf
2014-07-01
162
167
2,6-diaminopyridine
N-methylation
selectivity
one-pot reaction
Mehdi
Nabati
mnabati@ymail.com
1
Chemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran
LEAD_AUTHOR
Mehrdad
Mahkam
mehdi_1046@yahoo.com
2
Chemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran
AUTHOR
ORIGINAL_ARTICLE
1-Carboxymethyl-3-methylimidazolium chloride {[cmmim]Cl} as an efficient catalyst for the solvent-free synthesis of bis(indolyl)methanes
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.
https://icc.journals.pnu.ac.ir/article_513_0753ee8138a9d0eb7e20762e7b60a4e0.pdf
2014-07-01
168
172
1-Carboxymethyl-3-methylimidazolium chloride {[cmmim]Cl}
imidazolium salt
bis(indolyl)methane
indole
arylaldehyde
solvent-free
Ahmad Reza
Moosavi-Zare
moosavizare@yahoo.com
1
Department of Chemistry, University of Sayyed Jamaleddin Asadabadi,
Asadabad, 6541835583, Iran.
LEAD_AUTHOR
Mahdi
Pouraskar-Borazjani
pooraskar192@gmail.com
2
Department of Chemistry, Payame Noor University, Iran
AUTHOR
Zahra
Naz
zahranaz303@yahoo.com
3
bDepartment of Chemistry, Payame Noor University, Iran
AUTHOR
ORIGINAL_ARTICLE
Effects of structure and number of Heteroatom on the π-π stacking interactions of benzene with N-substituted coronenes: A theoretical study
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.
https://icc.journals.pnu.ac.ir/article_749_3dbc0817bd9449295fdf2500432705a7.pdf
2014-07-01
173
179
π-π stacking interaction
benzene
N-substituted-coronene
electron charge density
binding energy
Pouya
Karimi
p.karimi@uoz.ac.ir
1
Department of Chemistry, Faculty of science
University of Zabol, Zabol, Iran
LEAD_AUTHOR
Mahmoud
Sanchooli
sanchooli52@yahoo.com
2
Department of Chemistry, Faculty of science,
University of Zabol, Zabol, Iran
AUTHOR
ORIGINAL_ARTICLE
Ag nanoparticle/melamine sulfonic acid supported on silica gel as an efficient catalytic system for synthesis of dihydropyrimidin thiones
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.
https://icc.journals.pnu.ac.ir/article_778_c682a797f1c3b0ae09c658e4213392ec.pdf
2014-07-01
180
186
Nanoparticle melamine sulfonic acid.SiO2
Biginelli reaction
3
4-dihydropyrimidin-2(1H)-thione
solvent free
Parya
Nasehi
1
Department of chemistry, Science and Research Branch, Islamic Azad University, Ahvaz, Iran
AUTHOR
Alireza
Kiasat
2
Department of chemistry, Science and Research Branch, Islamic Azad University, Ahvaz, Iran
AUTHOR
Mohammad Kazem
Mohammadi
mkmohamadi@yahoo.com
3
Islamic Azad University , Ahvaz Branch
LEAD_AUTHOR
ORIGINAL_ARTICLE
Caesium carbonate as a highly efficient catalyst for the synthesis of macrocyclic diamides
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.
https://icc.journals.pnu.ac.ir/article_782_c4b49d2f055b63cf134cced2c9d9fd58.pdf
2014-07-01
187
195
Macrocyclic diamide
aza oxa thia crown
Synthesis
macrocycle and caesium carbonate (CS2CO3).
________________________________________
Esmael
Rostami
esmrostami@yahoo.com
1
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
LEAD_AUTHOR
Maryam
Bagherzadeh
maryam.bagherzadeh@ymail.com
2
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Akram
Khodadadi
akram.khodadadi@yahoo.com
3
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Ay Soda
Ghobadpoor
i.ghobadpoor@yahoo.com
4
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Fatemeh
Dehghani
f.dehghani00@gmail.com
5
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Zahra
Heidari
zheidari@yahoo.com
6
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Mahmood
Feraidooni
mahmoodferaidooni@yahoo.com
7
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Zahra
Abshirini
zabshirini@yahoo.com
8
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Fatemeh
Tavazo
fatemeh_tavazo@yahoo.com
9
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
Zahra
Keshvarz
z.keshavarz1385@yahoo.com
10
Department of Chemistry, Payame Noor University, Tehran, P.O. Box 19395-4697, Iran
AUTHOR
ORIGINAL_ARTICLE
Synthesis, characterization and swelling behavior investigation of gelatin-g-Poly(Acrylic Acid-co-Itaconic Acid)
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.
https://icc.journals.pnu.ac.ir/article_788_62cf10b14ffb7b3a239a3796e4800b64.pdf
2014-07-01
196
208
Superabsorbent
hydrogel
acrylic acid
itaconic acid
swelling behavior
Hossein
Hosseinzadeh
h_hoseinzadeh@pnu.ac.ir
1
Payame Noor University
LEAD_AUTHOR
Mojtaba
Abbasian
m_abbasian20@yahoo.com
2
Payame Noor University
AUTHOR
Shadi
Hassanzadeh
shadi_hassanzade@yahoo.com
3
Payame Noor University
AUTHOR
ORIGINAL_ARTICLE
The computational study of adsorption of carbon monoxide on pristine and Ge-doped (6,0) zigzag models of BNNTs
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.
https://icc.journals.pnu.ac.ir/article_789_e4c984d1507f5dcb898fdcde5c9836a2.pdf
2014-07-01
209
221
Boron nitride nanotube
density function theory
adsorption CO
Ge-doped
NQR
Mahdi
Rezaei Sameti
mrsameti@gmail.com
1
Physical chemistry departement, Facualty science
LEAD_AUTHOR
Nina
Alisafarzadeh
2
Department of Applied Chemistry, Faculty of Science, Malayer University, Malayer, 65174, Iran
AUTHOR
ORIGINAL_ARTICLE
The effect of sulfuric acid on pore initiation in anodic alumina formed in oxalic acid
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.
https://icc.journals.pnu.ac.ir/article_790_355529e69300186646df1244dbd93491.pdf
2014-07-01
222
231
Thin Films
anodized aluminum oxide
porosity
electrolyte composition
Behnam
Hafezi
hafezi_behnam@yahoo.com
1
Faculty of Chemistry and Petrochemical Engineering, Standard Research Institute (SRI), Karaj P. O. Box 31745-139, Iran.
LEAD_AUTHOR
Anodisation of aluminium: New applications for a common technology. Nano Wizard Application Report, Cambridge, UK, September 2003.
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