2024-03-28T23:54:06Z
https://ijcce.ac.ir/?_action=export&rf=summon&issue=1702
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
A New Synthesis of Alpha-Hydroxycarboxylates and 2-Hydroxybenzoates
Ali
Khalaj
Reza
Abooafzeli
A new synthesis of a-hydroxycarboxylates and 2-hydroxybenzoates based on the reaction of acetonides of a-hydroxycarboxylic acids and 2-hydroxybenzoic acid with sodium alkoxides in the corresponding alcohols as solvent is described. In general, decreasing the steric hindrance of the reactants and increasing the boiling points of alcohols increased the yields and decreased the required time for the reactions.
Alpha-Hydroxycarboxylates
2-Hydroxybenzoates
Acetonides
Sodium alkoxides
1997
06
01
1
3
https://ijcce.ac.ir/article_10322_17c80b2e03cfc3588f18b36d32ff310a.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Synthesis and Characterization of Aminocarboxylato Iridium(III) Complexes
Mohammad
Kooti
Joseph S.
Merola
Aminocarboxylic acids, such as 2-aminobenzoic acid, react easily with [Ir(COD)(PMe3)3]Cl, (COD=1,5-cyclooctadiene), in THF to produce hydridoaminocarboxylato iridium(III) complexes in high yields. These octahedral complexes are formed via oxidative addition reaction of the O-H bond of the carboxylic group with the central metal. The starting iridium(I) complex losses the COD molecule, the chloride is coordinated to the metal and the phosphine groups take a meridional position in the final products which are characterized by 1H, 13C and 31P NMR spectroscopies.
Irridium(III) complexes
Hydridoaminocarboxylato iridium (III) complexes
Aminocarboxylate complexes
1997
06
01
4
7
https://ijcce.ac.ir/article_10324_e8e7cedb5e9c06862a356009a0c6bc74.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Kinetic Studies of the Catalytic Oxidation of Toluene to Benzoic Acid in the Liquid Phase
Fereydoon
Milani Nejad
Mohammad
Rahimizadeh
Hassan Ali
Mirshahi
The catalytic oxidation of toluene to benzoic acid in the liquid phase has been studied in an un-stirred tank reactor. Low concentration of acetic acid was added in order to increase the solubility of the catalyst in toluene. The dependence of the rate of reaction on the concentration of toluene catalyst and oxygen pressure was studied. It has been suggested that liquid phase oxidation of toluene to benzoic acid primarily is a diffusion controlled reaction and the order of reaction with respect to oxygen shifts to lower values by stirring.
Catalytic oxidation
Toluene
Benzoic acid
Rate of reaction
Diffusion controlled reaction
1997
06
01
8
9
https://ijcce.ac.ir/article_10325_789675a63f8ff2149828bd5c2c0adefd.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Synthesis of 1,2,3,4,5,6,7,8-Octahydro-9-Ethoxy-10-Hydroxy-1-Anthracenone[OEHA]
Abbas
Shockravi
Kazem
Agh Nasiri
Anthralin and some of its derivatives have implied antipsoriatic effect in clinical and pharmaceutical studies. Anthralin is synthesized by different strategies. In this work we report the synthesis of "OEHA" as a precursor of another biological active compound.
Anthralin
Antipsoriatic activity
1-Hydroxy-9-Anthrone
Octahydro-9-ethyoxy-10-hydroxy-1-anthracenone
1997
06
01
10
14
https://ijcce.ac.ir/article_10326_7d1102ea4e353c4d6f9ab8d185f6a28c.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
An Electrochemical Study of the S-Derivatives of 2-Amino Cyclopentene-1-Dithiocharboxylic Acid in Aqueous Ethanolic Media
Afsaneh
Safavi
Mohammad Bagher
Golivand
A systematic study on the electrochemical behavior of the S-derivatives of 2-amino cyclopentene-1-dithiocarboxylic acid (ACDA) has been carried out in aqueous ethanolic solutions by means of polarography, coulometry and voltammetry. All the compounds studied exhibited a well defined anodic wave corresponding to a diffusion controlled process. Controlled potential coulometry gave n=1 per mole for the anodic waves of the S-methyl and N-methyl S-methyl derivatives of ACDA, while for the dimer of ACDA a two electron oxidation wave was obtained.
Electrochemical study
Dithiocarboxylic acid derivatives
Aqueous ethanolic media
1997
06
01
15
18
https://ijcce.ac.ir/article_10327_31c2acc3b46392a5193108005dc8d22d.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Estimation of the Unperturbed Chain Dimensions of Poly(Vinyl Chloride) Polymer by Various Methods
Mohammad
Saleem Khan
Akhtar
Saeed
Flory Fox, Kurata-Stockmayer, Berry, Inagaki-Suzuki-Kurata, Stockmayer-Fixman and Ahmad-Baloch methods based on the excluded volume theory have been applied to poly(vinyl chloride)-cyclohexanone system to obtain Kq and the radius of gyration. A discussion on the reliability of these methods is given. The Stockmayer-Fixman and Ahmad-Baloch methods are found to be equally applicable.
Unperturbed chain dimensions
PVC
K
Radius of gyration
Intrinsic viscosity
1997
06
01
19
21
https://ijcce.ac.ir/article_10328_e5fcc3206c0ece63b7e4a8e6b83ec9a5.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Spectrophotometric Study of Cobalt, Nickel, Copper, Zinc and Lead Complexes with Methylthymol Blue in Binary Water-Methanol Mixtures
Raoof
Ghavami
Hamid
Abdollahi
Mohammad
Saleem Khan
The complexation reactions between methylthymol blue (MTB) and Co2+, Ni2+, Cu2+, Zn2+ and Pb2+ ions have been studied in different water-methanol mixtures at pH 4.45 and 25 °C by a spectrophotometric technique. The stepwise stability constants of the resulting 1:1 and 2:1 (metal ion to ligand) complexes were determined from the absorbance-mole ratio data. It was found that the overall stability constants of the complexes formed increase in the order Zn2+<Co2+<Pb2+<Ni2+<Cu2+ for all solvent mixtures studied. There is an inverse relationship between the overall stability of the complexes and amount of water in the mixed solvent. A linear relationship was observed between log b2 of the complexes and the mole fraction of methanol in the solvent mixture.
MTB complexes
Stoichiometry
stability
Mixed solvent
Spectrophotometry
1997
06
01
22
28
https://ijcce.ac.ir/article_10329_4cf2b210551ce0b3755fd2c778255292.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Selective Mono Bromination of 1,4-Dihydropyridines
Yousef
Rastgar Mirzaei
Adeleh
Moshtaghi Zenouz
2-monobromomethyl 1,4-dihydropyridines is selectively synthesized by bromination of the parent compound by 1.1 equivalents of pyridinium bromide perbromide in dichloromethane/pyridine at -20 °C. The same reagent in dichloromethane at 0 °C produce the 2,6-bis(bromomethyl) 1,4-dihydropyridines.
Nifedipine analogues
Calcium channel antagonist
1
4-Dihydropyridine
Bromomethyl-1
4-dihydropyridines
1997
06
01
29
32
https://ijcce.ac.ir/article_10330_177d531e444eed09594a91daf5311df4.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Synthesis of 2-Mono and 2,6-Disubstituted Methyl-1,4-Dihydropyridines
Yousef
Rastgar Mirzaei
Karim
Akbari Dilmaghani
The 2-mono and 2,6-disubstituted methyl-1,4-dihydropyridines were synthesized by reaction of morpholine, thiophenol, 8-hydroxyquinoline, 2-naphthol and 2-mercopto-1-methyl imidazole with the 2-mono bromo and 2,6-dibromo-1,4-dihidropyridines.
Nitrenedipine analogues
Calcium channel antagonists
2-mono and 2
6-disubstituted 1
4-dihydropyridines
1997
06
01
33
35
https://ijcce.ac.ir/article_10338_b121834ae222007b91ed37c0d793e8bd.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
Material Balance by Linear Equations
Seyed Mohammad
Milani
Material Balance around process has been conducted by using mixer output equations. A method based on Mason's theory has been proposed to develop mixer output equations.
Numerical method
Material balance
Linear process simulation
Mixer output equations
Mason's theory
1997
06
01
36
39
https://ijcce.ac.ir/article_10339_92349fa35253b6d3b294b0bc9df9e9af.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1997
16
1
The Effect of Superficial Feed Velocity on the Column Flotation Recovery in Comparison with the Conventional Flotation Cells
Rahbar
Rahimi
Majid
Tahmooresi
Flotation is the most important process for concentrating mineral ores. This process may occur in any vessel such as column flotation, which has been used widely during the last decade and the conventional flotation cells. The effect of superficial feed velocity on the copper recovery was investigated using pilot-scale column flotation of "Sarcheshmeh Capper Complex". The results were compared with the conventional flotation cell data. It was reveled that for coarse particles (d80 = 90 mm) this column could not be used instead of cells and rougher cells, but for small particles (d80=44 mm) it could. For coarse particles, recovery curve demonstrated a maximum with increase in feed rate. However, a minimum was observed for fine particles.
Column flotation
Flotation cell
Recovery
Collecting zone
Cleaning zone
1997
06
01
40
47
https://ijcce.ac.ir/article_10340_49111942add88e823c52ebd5722b9ed2.pdf