2024-03-29T10:59:48Z
https://ijcce.ac.ir/?_action=export&rf=summon&issue=1712
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
Spectroscopic Study of the Complexation of Meso-Tetraphenylporphyrin with -Acceptors DDQ and TCNE in Chloroform Solution
Elham
Eslami
Dariush
Mohajer
Mojtaba
Shamsipur
Formation of the molecular complexes between meso-tetraphenylporphyrin (TPP) and the p-acceptors 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) and tetracyanothylene (TCNE) in chloroform solution was investigated spectrophotometrically. The formation constants of the resulting 1:1 molecular complexes were determined using the Benesi-Hildebrand and Nash methods. The TPP-DDQ proved to be more stable than TPP-TCNE complex. The resulting molecular complexes were isolated in crystalline form and characterized.
Molecular complexes
Stoichiometry
stability
Spectrophotometry
IR
Tetraphenylporphyrin
DDQ
TCNE
2000
06
01
1
5
https://ijcce.ac.ir/article_10204_2a74481859830c3a10f6a7a4fad2eebe.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
Efficient Synthesis of a Range of Benzosubstituted Macrocyclic Diamides
Hashem
Sharghi
Ahmad Reza
Massah
Khodabakhsh
Niknam
Some new macrocyclic dibenzotetraoxadiamides, tribenzotetraoxadimides, tribenzopentaoxadiamide, tribenzohexaoxadiamide, and tetrabenzoheptaoxadiamide 15-22 have been prepared. These compounds were obtained in the macrocyclization step by reacting the diamines 6 and 7 with appropriate dicarboxylic acid dichlorides 8-14. The cyclization does not require high dilution techniques or template effect and provides the expected dilactams in high yields ranging from 63% to 81%.
Macrocyclic diamides
Synthesis
Direct macrocyclization
Dicarboxylic acid dichloride
2000
06
01
6
12
https://ijcce.ac.ir/article_10199_3f0816a9e5003cff873ee9a0e8775719.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
FT-Raman Spectra of Saffron (Crocus Stivus L.); A Possible Method for Standardization of Saffron
Amanollah
Aminzadeh
FT-Raman Spectra of Saffron (crocus sativus L.) with a partial assignment is reported. Based on the Raman data, it is concluded that main pigments in saffron are crocins and crocetin. It is proposed that the quickly attainable FT-Raman spectrum of solid saffron, may be used as a means of saffron standardization.
Saffron
FT-Raman spectra
Crocetin
Crocin
2000
06
01
13
15
https://ijcce.ac.ir/article_10200_e4f7034e3912dc87772079b88b650dd3.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
Cycloaddition of Diphenylnitrilimine to 1,5-Benzodiazepines
Rachid
Zinber
Redouane
Achour
Ahmed Jalal
El Hajji
Asmaa
Hakan
Mohammed Zoubair
Cherkaui
The cycloaddition reaction of diphenylnitrilimine on the 1,5-benzodiazepines has been studied. New molecules of triazolobenzodiazepines type have been isolated and characterized.
Benzodiazepine
Diphenylnitrilimine
Heterocycle
Cycloaddition
Phase transfer catalyse
2000
06
01
16
18
https://ijcce.ac.ir/article_10201_e343c780be1c12095313940f5dc74810.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
Preparation and Characterization of Ni(II), Co (II) and Cr(III) Complexes with Benzoylamethylenetriphenylphosphine
Ahmad
Emad
Kazem
Karami
The reaction between Ni(II), Co(II), cr(III) bitrates, Ni(II) chloride and ambidentate a-keto ylide benzoylmethylenetriphenylphosphine (BPPY) resulted in isolation of [Ni(BPPY)2](NO3)2.2H2O, [Ni(BPPY)2]Cl2, [Co(BPPY)2](NO3)2 and [Cr(BPPY)3](NO3)3; 2H2O. The compounds were characterized by elemental analyses and infrared 1HNMR spectroscopy, molar conductivity in solution and molecular weight measurements.
complex
Benzoylmethylenetriphenylphosphine
Ni(II)
Co(II)
Cr(III)
2000
06
01
19
23
https://ijcce.ac.ir/article_10202_3b460f20ac27e5e5157fe43b3151cee4.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
An Efficient One Pot Procedure for Preparation of Symmetrical N,N'-Disubstituted Urea from Aromatic and Aliphatic Amines and Urea under Microwave Irradiation
Mohammad S.
Khajavi
Mohammad Gl
Dakamin
Hassan
Hazarkhani
Mostafa
Hajihadi
Farzad
Nikpour
A phosgene-free synthesis of symmetrical N,N'-disubstituted urea by the reaction of aromatic and aliphatic primary amines and urea promoted by microwave irradiation in the presence of a suitable energy-transfer solvent such as N-N-dimethylacetamide is described.
Microwave irradiation
Amines
N'-Disubstituted urea
N-Dimethylacetamide
Solvent free reaction
urea
2000
06
01
24
28
https://ijcce.ac.ir/article_10203_4cdbfce8016c17706968d99a59c7dfc5.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
Rates of Acid-Catalyzed NH Proton Exchange of Enaminones, an 1H NMR Study
Ahmad
Shaabani
Faiezeh
Sadeghi Nejadt
Issa
Yavari
: 1H NMR spectra of a series of enaminones R-CO-CH=C(NHCH2Ph)-R [1, R=CH3; 2, R=C6H5; 3, R=CF3; 4, R=CH2CH2CH2; 5, R=CH2C(CH3)2CH2], were obtained in the presence of trifluoroacetic acid in CDCl3 or DMSO-d6 at 28 °C. Steric, solvent, electronic and hydrogen bonding effects on the rates of acid-catalyzed NH proton exchanges were investigated. Rate constants were calculated by 1H NMR line shape analysis.
Proton exchange reaction
Acid-catalyzed proton exchange
Dynamic NMR spectroscopy
Rate constants
Enaminones
2000
06
01
29
31
https://ijcce.ac.ir/article_10209_6ace2d6a9383621b08ba2deeacc5ee4c.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
A Novel and Efficient Synthesis of New Dixanthones
Hashem
Sharghi
Fatemeh
Tamaddon
Hossein
Eshghi
The facile and high yield synthesis of a new series of dibenzophenones in the presence of polyphosphoric acid (PPA) together with their cyclization to corresponding moni and dixanthones are described. The aromatic nucleophilic substitution of these new compounds are also studied.
Dixanthones
Synthesis
Dibenzophenones
Aromatic nucleophilic substitution
2000
06
01
32
36
https://ijcce.ac.ir/article_10207_adf7b9dc1976a021b9dab429678e4b99.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
Sulphuric Acid Adsorbed on Silica Gel. A Remarkable Acetylation Catalyst
Mohammad, A.
Bigdeli
Nikdokht
Nahid
Majid
M. Heravi
Sulphuric acid adsorbed on silica gel is a practical and useful catalyst for acetylation of varius alcohols, Phenols and amines.
Sulphuric Acid
Silica gel
Acetylation alcohols
Amines
2000
06
01
37
39
https://ijcce.ac.ir/article_10208_3c0dfb5ffe563db3073ae72a798273d3.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
2000
19
1
The Role of Boron in Thermal Decomposition of Ammonium Perchlorate
Abdolsamad
Zarrin Ghalam Moghaddam
Ali Akbar
Hashemi Pour Rafsanjani
Simultaneous thermal analysis (STA) method has been applied to study decomposition reactions of AP under a flowing nitrogen atmosphere and static air. Results obtained indicate that a phase transformation occurs prior to the decomposition reaction. Decomposition takes place exothermally in two stages, first stage of decomposition could be suppressed by the controlled heating programme. Addition of a small amount of born lowered the temperature of the exotherm and increased the overall enthalpy of reactions.
Ammonium perchlorate
Thermal decomposition
Catalytic effects
solid propellant
Thermal Analysis
2000
06
01
40
42
https://ijcce.ac.ir/article_10196_591c7d35030e481b358b977003918eac.pdf