2024-03-29T00:03:30Z
https://ijcce.ac.ir/?_action=export&rf=summon&issue=1811
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Preparation and Characterization of Ti(BH4)3(THF)3 and V(BH4)2(TMEDA)2 Complexes
Hossein
Aghabozorg
Robabeh
Alizadeh
We have recently synthesized Ti(BH4)3(THF)3 and V(BH4)2(TMEDA)2 complexes. The reaction of TiCl3(THF)3 with NaBH4 in dry THF gave flat blue crystals, Ti(BH4)3(THF)3. The reaction of VCl3 with NaBH4 in presence of N, N, N', N'- tetramethylethylenediamine, TMEDA, produced violet crystals, V(BH4)2(TMEDA)2. Vibrational and magnetic properties of Ti(BH4)3(THF)3 and V(BH4)2(TMEDA)2 have been studied.
Ti(BH4)3(THF)3
V(BH4)2(TMEDA)2
Preparation
vibrational spectra
1994
12
01
68
71
https://ijcce.ac.ir/article_10918_b7c15a213be657b63327307b64d00c28.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Transannular Interaction: Molecular Structure and Conformational Properties of N-Aryl-1-Azacyclooctan-5-Ones
Mehran
Chiaci
Ali
Mohajeri
Conformational properties of N-aryl-1-azacyclooctan-5- ones with a p-methyl, m-methyl, and p-methoxy group as a substituent have been studied by 1H-NMR, 13C-NMR and IR spectroscopies. Transannular interaction of the two functional groups have been examined from the ring inversion barriers and the carbonyl vibrational frequencies with reference to the corresponding data of the respective monofunctional and difunctional compounds.
Transannular interaction
Ring inversion
Pseudorotation
Conformational analysis
Eight-membered rings
1994
12
01
72
76
https://ijcce.ac.ir/article_10919_fecfdf43f3abd2ca7299a4a7d6a391e5.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Manganese and Cobalt Salts of Para-Amino-Benzoic Acid Supported on Silica Gel as Oxidizing Catalysts
Mohammad M.
Hashemi
Dadkhoda
Chazanfari
Para-Aminobenzoic acid is supported on silica gel via reaction of activated silica gel and p-aminobenzoic acid which is then converted to its manganese and cobalt salts. A mixture of the manganese and cobalt salts of the acid is used to catalyze allylic and benzylic alcohols to their corresponding carbonyl compounds in reasonable yields using oxygen or air. Reactions are clean and the catalysts can be recovered easily and reused repeatedly.
Manganese and cobalt salts of P-aminobenzoic acid
Benzyl and allyl aleohols
Carbonyl compounds
Reuseable catalysts
Oxygen and air
1994
12
01
77
82
https://ijcce.ac.ir/article_10920_4115fbe44ac6d8e733ae4242085faa42.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Synthesis of Binuclear Copper (II) Complexes with Expanded Porphyrins
Saeid
Amani
Janathan
Sessler
The synthesis and characterization of some new binuclear copper (II) complexes, based on the use of large, pyrole-containing macrocycles, the so called "expanded porphyrins", [Cu2(macrocycle)]+4 is described. Electron Spin Resonance (ESR) studies indicate a weak "half-field line", which is characteristic of the Cu(II)-Cu(II) dimer, is observed at about 1600G. The observation of this band strongly suggests that the hyperfine structure arises from a spin triplet species.
Copper(II)
Expanded porphyrins
complexes
1994
12
01
83
90
https://ijcce.ac.ir/article_10921_7ab971e5655f62a7dee1172f732c6b84.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Extraction-Fluorimetric Determination of Low Levels of Copper by 1,7- Diaza-15-Crown-5 and Rose Bengal
Mojtaba
Shamsipur
Mohammad Reza
Fathi
A simple and sensitive extraction-fluorimetric method for the determination of copper is reported. The 1,7-diaza-15-crown-5-copper-rose Bengal (DA15C5-Cu-RB) ternary complex is quantitatively extracted into chloroform, diluted with ammoniacal acetone and its fluorescence intensity is measured at 570 nm with excitation at 540 nm. A linear calibration graph was obtained over the copper concentration range of 0.05-0.50 mg/mL. The relative standard deviation for 0.35 mg/mL copper is 3.9%. The interfering effect of a large number of diverse ions on the determination of copper was studied. The method was applied to the determination of copper in tap water.
copper
Low level determination
1
7-diaza-15-crown-5
Rose Bengal
Extraction
Fluorimetry
1994
12
01
91
96
https://ijcce.ac.ir/article_10922_f302041c89615669981c8334ab40cd63.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Kinetic-Spectrophotometric Determination of Thiocyanate Based on Its Inhibitory Effect on the Oxidation of Pyrogallol Red by Bromate
Ali Asghar
Ensafi
Javad
Tajebakhsh-e-Ardakany
A kinetic spectrophotometric method for rapid measurement of thiocyanate in serum, urine and sewage water with no need for removed of interfering substances in described. The method is based on the inhibitory effect of thiocyanate on the oxidation of pyrogallol red by bromated and nitrite which is monitored at 467 nm. The variables affecting the rate of the reaction were investigated and the optimum conditions were established. Thiocyanate can be measured in the range of 0.010-0-0.500 mg/mL with a limit of detection of 0.001 mg/mL. The relative standard deviation for ten replicate determination of 0.025 mg/mL of thiocyanate is 1.5%.
kinetic
Thiocyanate
Pyrogallol red
Bromate
Oxidation
Inhibitory effect
1994
12
01
97
103
https://ijcce.ac.ir/article_10923_42f79f3dc7311e5dce98c6ea19b329bd.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Conversion of N-Heptane on Pt/Al2O3 Catalyst
Mohammad
Moein
Hydrogenation reaction with n-heptane on Pt/Al2O3 catalyst was investigated under the steady state condition in a fixed bed reactor. The catalyst was prepared under a variety of conditions, but the one chosen was non-acidic that is not considered a hydrocracking catalyst. The main objective was to vary the selectivity of n-heptane as a function of reaction variables especially the partial pressure of hydrogen, because in addition to hydrogenolysis, other reactions like isomerization and cyclization also take place. Our studies on selectivity of n-heptane on platinium catalyst shows that in general cracking reactions preferably yield propane and n-butane, and at high pressures methane is also produce as a result of further cracking reactions. Products formed at low pressures (2-10 atm) are: 3-methyl-hexane and 2,3-dimethyl pentane. Those produced with lower yields at higher pressure (20-40 atm) were predominantly 2-methyl hexane and 3-methyl hexane. Dominant cyclic products were 1 tr 2-dimethylcyclopentane, toluent, methylcyclohexane, and ethyl cyclopentane. Upon increasing the hydrogen partial pressure, 1 tr 2-dimethyl cyclopentane increases strongly and those of six membered rings decrease.
N-Heptane
Pt/Al2O3 Catalyst
Hydrogen
Selectivity
Hydrogenolysis
1994
12
01
104
114
https://ijcce.ac.ir/article_10924_c3d00658f2d57f85c0513619e8785066.pdf
Iranian Journal of Chemistry and Chemical Engineering
Iran. J. Chem. Chem. Eng.
1021-9986
1021-9986
1994
13
2
Synthesis and Optimization of Separation Section of MTBE Process
Mohammad Reza
Omidkhah
Seyyed Ahmad
Seyyed Shabestari
Methyl tertiary butyl ether (MTBE) is known as a promising substitute for tetra ethyl lead (TEL) in order to increase the octane number of gasoline. MTBE process, as many other processes, has two distinguished section, namely reaction section and separation section. In this paper we focus only on synthesis and optimization of separation section of this process. In order to achieve this objective, many possible flowsheets have been considered, among which, two alternatives are pointed out as optimum candidates. The second step involves determination of dominant design variables and their range of variation. Both selected flowsheets have been cost analyzed in their corresponding ranges of dominant design variables to determine plots of total annual cost (TAC). Knowing feed specifications at the entrance of separation section, the designer will be able to choose appropriate flowsheet and optimum conditions using the plots presented in this paper.
MTBE
Separation section
Process synthesis
Process simulator
Design variable
Optimization
1994
12
01
115
122
https://ijcce.ac.ir/article_10925_c972a0366830223f9fec68e36c270356.pdf