1 March 05, 2018
Articles and Statements
1. Abdelilah Benallou, Habib El Alaoui El Abdallaoui, Hocine Garmes
Purification of the Toxic Gaseous HCN Emissions by Oxidation in O2 Atmosphere in the Gas Phase: Quantum Chemical Modeling
European Reviews of Chemical Research, 2018, 5(1): 3-10.
Number of views: 1517 Download in PDF
2. I.A.A. Ibrahim, M. Chindo, M.M. Mohammad, A.A. Faisal, H. MusaEuropean Reviews of Chemical Research, 2018, 5(1): 3-10.
Abstract:
HCN oxidation has been conducted in oxygen atoms, whereas the higher availability of oxygen in the atmosphere increases the HCN purification. However, this study was studied theoretically using density functional theory (DFT) method. The present work aims to evaluate the oxidation behaviour of HCN emissions in O2 atmosphere. A detailed chemical kinetic mechanism for HCN combustion was evaluated. According to the proposed kinetic mechanism, in the ambient conditions, the oxidation of HCN proceeds mostly through the following sequence: HCN+O→NCO+H and CO2+NH. The present modeling shows that these oxidations are preferred kinetically and energetically and are spontaneously possible in the atmosphere.
HCN oxidation has been conducted in oxygen atoms, whereas the higher availability of oxygen in the atmosphere increases the HCN purification. However, this study was studied theoretically using density functional theory (DFT) method. The present work aims to evaluate the oxidation behaviour of HCN emissions in O2 atmosphere. A detailed chemical kinetic mechanism for HCN combustion was evaluated. According to the proposed kinetic mechanism, in the ambient conditions, the oxidation of HCN proceeds mostly through the following sequence: HCN+O→NCO+H and CO2+NH. The present modeling shows that these oxidations are preferred kinetically and energetically and are spontaneously possible in the atmosphere.
Number of views: 1517 Download in PDF
Extraction and Phytochemical Analysis from the Leave of Vernonia Amygdalina (Shuwaka)
European Reviews of Chemical Research, 2018, 5(1): 11-15.
Number of views: 1405 Download in PDF
3. I.A.A. Ibrahim, M. Chindo, M.M. Mohammad, A.A. Faisal, H. MusaEuropean Reviews of Chemical Research, 2018, 5(1): 11-15.
Abstract:
The phytochemical analysis of Vernonia Amygdalina (bitter leaf) was carried out to determine the bioactive compound presenting. The plant had been use locally to treat diseases for decades. The extraction of bioactive compounds was done through aqueous and ethanol extraction. The main bioactive compounds are alkaloids, tannin. saponnin, steroids, glycoside and flavonoids. The plant also exhibited antimicrobial activity on selected microorganisms. These activities may be as a result of the metabolites present tested for and those not tested for.
The phytochemical analysis of Vernonia Amygdalina (bitter leaf) was carried out to determine the bioactive compound presenting. The plant had been use locally to treat diseases for decades. The extraction of bioactive compounds was done through aqueous and ethanol extraction. The main bioactive compounds are alkaloids, tannin. saponnin, steroids, glycoside and flavonoids. The plant also exhibited antimicrobial activity on selected microorganisms. These activities may be as a result of the metabolites present tested for and those not tested for.
Number of views: 1405 Download in PDF
Phytochemical and Antimicrobial Activity of Stem Bark Extract of Ficus Plat Platyphylla Extraction and Phytochemical Analysis from the Leave of Vernonia Amygdalina (Shuwaka)
European Reviews of Chemical Research, 2018, 5(1): 16-21.
Number of views: 1527 Download in PDF
4. N. Ourhriss, A. Zeroual, C. A. Gadhi, A. Benharref, A. Abourriche, A. Bennamara, A.El HajbiEuropean Reviews of Chemical Research, 2018, 5(1): 16-21.
Abstract:
Stem bark sample (100g and 60g) of Ficus platyphylla were thoroughly extracted with ethanol and water respectively. The qualitative phytochemical analysis of the ethanol crude extract showed the presence of saponin, tannis, flavonoids ring, cardiac glycosides and carbohydrates, steroids ring, and Alkaloids. The qualitative was justified by their colour changes with their various reagents. The extract exhibited antimicrobial activity on E coli and S aureus. This appears to because of the secondary metabolites tested for and those present but not tested for.
Stem bark sample (100g and 60g) of Ficus platyphylla were thoroughly extracted with ethanol and water respectively. The qualitative phytochemical analysis of the ethanol crude extract showed the presence of saponin, tannis, flavonoids ring, cardiac glycosides and carbohydrates, steroids ring, and Alkaloids. The qualitative was justified by their colour changes with their various reagents. The extract exhibited antimicrobial activity on E coli and S aureus. This appears to because of the secondary metabolites tested for and those present but not tested for.
Number of views: 1527 Download in PDF
A Regioselective and Stereoselective Synthesis of 2,5-Dichloro-2,5,9,9-tetramethyl-decahydro-benzocycloheptene via Stepwise addition Reactions between α-himachalene and HCl: Experimental and Theoretical Study
European Reviews of Chemical Research, 2018, 5(1): 22-29.
Number of views: 1469 Download in PDF
5. H.A. ShindyEuropean Reviews of Chemical Research, 2018, 5(1): 22-29.
Abstract:
2,5-Dichloro-2,5,9,9-tetramethyl-decahydro-benzocycloheptene has been prepared using addition reaction of α-himachalene and HCl. In addition, this reaction have been theoretically studied using DFT methods at the B3LYP/6–31G(d) level of theory. The comparatively low activation energies and Parr functions of the nucleophilic α-himachalene and 3,7-dichlorohimachalane, as well as electrophilic Parr functions of the electrophilic HCl, expounding the regio- and stereospecific experimentally observed.
2,5-Dichloro-2,5,9,9-tetramethyl-decahydro-benzocycloheptene has been prepared using addition reaction of α-himachalene and HCl. In addition, this reaction have been theoretically studied using DFT methods at the B3LYP/6–31G(d) level of theory. The comparatively low activation energies and Parr functions of the nucleophilic α-himachalene and 3,7-dichlorohimachalane, as well as electrophilic Parr functions of the electrophilic HCl, expounding the regio- and stereospecific experimentally observed.
Number of views: 1469 Download in PDF
Novel Polyheterocyclic Cyanine Dyes: Synthesis, Photosensitiztion and Solvent/Electronic Transitions Correlation
European Reviews of Chemical Research, 2018, 5(1): 30-39.
Number of views: 1611 Download in PDF
6. European Reviews of Chemical Research, 2018, 5(1): 30-39.
Abstract:
Novel polyheterocyclic cyanine dyes covering aza-cyanine dyes and bis aza-cyanine dyes derived from 3,8-diethyl-2,7-diphenyl benzo [2,3-b; 2 , 3 - b ] bis furo[3,2-d] pyrazolium iodide quaternary salt were prepared. The electronic visible absorption spectra for all the synthesized cyanines were investigated in 95 % ethanol solution to evaluate their photosensitization/electronic transitions correlation. The cyanine dyes were thought to be better photosensitizers when they absorb the visible light to initiate the electronic transitions at higher wavelength bands (bathochromic shifted and/or red shifted dyes). Consequently, the photosensitization of the cyanine dyes decreases when they absorb the visible light to initiate the electronic transitions at lower wavelength bands (hypsochromic shifted and/or blue shifted dyes). Solvent/electronic transitions correlation study for some selected cyanine dyes were carried out in pure solvents having different polarities [water (78.54), Dimethylformamide (36.70), ethanol (24.3), chloroform (4.806), benzene (2.28) and dioxane (2.209)] to evaluate their solute/solvent interaction properties (general and/or specific solvent effects). Structural identification were confirmed using elemental analysis, visible spectra, IR and 1H NMR spectral data.
Novel polyheterocyclic cyanine dyes covering aza-cyanine dyes and bis aza-cyanine dyes derived from 3,8-diethyl-2,7-diphenyl benzo [2,3-b; 2 , 3 - b ] bis furo[3,2-d] pyrazolium iodide quaternary salt were prepared. The electronic visible absorption spectra for all the synthesized cyanines were investigated in 95 % ethanol solution to evaluate their photosensitization/electronic transitions correlation. The cyanine dyes were thought to be better photosensitizers when they absorb the visible light to initiate the electronic transitions at higher wavelength bands (bathochromic shifted and/or red shifted dyes). Consequently, the photosensitization of the cyanine dyes decreases when they absorb the visible light to initiate the electronic transitions at lower wavelength bands (hypsochromic shifted and/or blue shifted dyes). Solvent/electronic transitions correlation study for some selected cyanine dyes were carried out in pure solvents having different polarities [water (78.54), Dimethylformamide (36.70), ethanol (24.3), chloroform (4.806), benzene (2.28) and dioxane (2.209)] to evaluate their solute/solvent interaction properties (general and/or specific solvent effects). Structural identification were confirmed using elemental analysis, visible spectra, IR and 1H NMR spectral data.
Number of views: 1611 Download in PDF