Rate Accelerations in AgNO3 Mediated Transesterification of β –Keto esters
Thummala
Raja Mani
Department of Chemistry, Osmania University, Telangana State, Hyderabad 500007, India
author
Yelike
Hemanth Sriram
Department of Chemistry, Osmania University, Telangana State, Hyderabad 500007, India
author
Kuthati
Bhaskar
Department of Chemistry, Osmania University, Telangana State, Hyderabad 500007, India
author
Addula Kiran
Kumar
Department of Chemistry, Osmania University, Telangana State, Hyderabad 500007, India
author
Karunakar Rao
kudle
Department of Bio-Chemistry, Osmania University, Telangana State, Hyderabad 500007, India
author
text
article
2018
eng
In the present study, AgNO3 is employed as an effective catalyst for transesterification of β-keto esters with various alcohols under conventional and non-conventional conditions. The alcohols are easily converted into corresponding acetates in very good yields and less reaction times. However, a decrease in reaction times as well as moderate yields were observed when performed under non-conventional conditions such as Sonication and Microwave irradiation. Contrary to many other silver salts catalysts, AgNO3 has shown remarkable levels of activity and stability towards transesterification reaction. The tendency in reaction rates was found to be MWAS (3-6 min) <<< Sonication (30-45 min) <<< Conventional (8-12 hrs).
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
83
92
https://www.chemmethod.com/article_57590_f5fa11262f95a9f6012cfebbfdf5d8bb.pdf
dx.doi.org/10.22034/chemm.2018.57590
Association Parameters for Paratoluic Acid in Binary Mixtures of Ethanol and Water at Different Temperatures
Elsayed
Abouelleef
Basic Science Department (chemistry), Dakhlia, Mansoura, Egypt
author
Maii
Mashaly
Chemistry Department, Faculty of Science, Mansoura University, 35516-Mansoura, Egypt.
author
text
article
2018
eng
Different association parameters were evaluated for saturated paratoluic acid in the binary mixtures of ethanol-water at different temperatures by measuring the molal solubility and the mean activity coefficient. From the experimental solubility, pH, density data:- molar, Van der Waals, electrostriction, apparent molar volumes, dissociation constants, and association constants of paratoluic acid were estimated in order to estimate the contributions of solute-solvent interactions related to ion association. The saturated solution of paratoluic acid in the binary solvent mixtures of ethanol–water is perfectly non-ideal due to the mean activity coefficient of ions in the solution and partly due to the ion association phenomenon It was observed from the different volume values that all volumes for paratoluic acid were increased by increasing ethanol content in the mixed solvent due mainly to the higher solvation. It was concluded that the solute-solvent interaction increased by increasing ΔΔG and ΔGs due mainly to the increase in the association parameters in the corresponding solvents.
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
93
102
https://www.chemmethod.com/article_58127_32c56a78752269b8a6c140de9f4e19fa.pdf
dx.doi.org/10.22034/chemm.2018.58127
Synthesis and Characterization of Nano Sized ZnO and CdO by Direct Thermal Decomposition of Their Nano Sized Metal Schiff base Complexes
Iran
Sheikhshoaie
Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, 76175, Iran
author
Mahdiye
Sheikhshoaei
Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, 76175, Iran
author
Samaneh
Ramezanpour
Department of Chemistry, Shahid Bahonar University of Kerman, Kerman, 76175, Iran
author
text
article
2018
eng
Nano sized metal oxide; ZnO and CdO have been synthesized by the thermal decomposition of two Schiff base complexes. Zinc and cadmium Schiff base complexes have been synthesized at reflux condition by the reaction between bidentate Schiff base ligand (E)-2-((4-methoxyphenylimino) methyl) phenol and nitrate salts of Zn or Cd in acetonitrile as a solvent. The nanoparticles of the title complexes were obtained using the ultrasonic irradiation method in acetonitrile as an anti-solvent of the Zn and Cd metal complexes, and also using spectroscopy and physicochemical methods including FT-IR, UV-Vis, elemental analysis, X-ray powder diffraction (XRD) and scanning electron spectroscopy (SEM). The .nanoparticles (NPs) of ZnO and CdO with the average size of 27 and 32 nm were prepared by thermal decomposition of the title nano metal complexes. The metal oxide was identified by XRD pattern and SEM images.
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
103
113
https://www.chemmethod.com/article_60129_24b1feeb557ee682a2fe8472ac81d10a.pdf
dx.doi.org/10.22034/chemm.2018.60129
Electrochemical and Simulation Analysis of Salen as a Corrosion Inhibitor
Homa
Shafiee
Payam Noor University, Department of Chemistry, Tehran, Iran
author
Fatemeh
Mostaghni
Payam Noor University, Department of Chemistry, Tehran, Iran
author
Kolsoum
Ejraei
Islamic Azad University Lamerd Branch, Lamerd, Iran
author
text
article
2018
eng
The potentiodynamic polarization curves, quantum chemical calculation and molecular dynamics simulation methods are used to study the inhibition effects of Salen ligand regarding the corrosion of carbon steel (A105) in salty and acidic solutions of 3.5% NaCl and 1.0 M HCl respectively. The results show that the values of inhibition efficiency in 3.5% NaCl and 1.0 M HCl solutions are higher than 96% and 95% respectively at 25 oC. For both solutions, the adsorption of the inhibitor on steel surface corresponds the Langmuir adsorption isotherm, and the nature of adsorption is mainly chemical. All the results show that Salen is a good corrosion inhibitor for protection of steel in both Salty and acidic medium.
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
114
127
https://www.chemmethod.com/article_60128_0af73351c14c554fddbd9ab1516315b1.pdf
dx.doi.org/10.22034/chemm.2018.60128
Theoretical Investigation on the Antitumor Drug: ThioTEPA and its Interaction with S-donor Biomolecules and DNA Purine Bases
Mehdi
Nabati
Chemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran
author
Maliheh-alsadat
Kermanian
English language Department, Faculty of Foreign Languages, Pishva Branch, Islamic Azad University, Varamin, Iran
author
Hossein
Mohammadnejad-Mehrabani
Chemistry Department, Tarbiat Modarres University, Tehran, Iran
author
Hadieh
Rahbar Kafshboran
Chemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran
author
Maryam
Mehmannavaz
Chemistry Department, Faculty of Science, Azarbaijan Shahid Madani University, Tabriz, Iran
author
Saman
Sarshar
Physics Department, Faculty of Science, Lorestan University, Khorramabad, Iran
author
text
article
2018
eng
During recent years, it has been shown that the thioTEPA molecule can play a very important role as an anticancer drug. The present research studies the structural and spectral properties and reactivity of the thioTEPA antitumor agent in confronting the sulfur-donor biomolecules (cysteine and methionine) and DNA purine bases (adenine and guanine). The study was done based on the quantum-mechanical computations. All studied compounds were optimized by B3LYP/6-31+G(d,p) basis set of theory. The IR computations showed no imaginary frequency for all compounds. So, the accuracy of our computational methods was proved. This study indicates that the adenine base has the best reaction with this antitumor drug among all biomolecules. So, the thioTEPA antitumor agent prefers to react with adenine base.
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
128
140
https://www.chemmethod.com/article_56141_d530e054d3e4cd656296874aec286fcf.pdf
dx.doi.org/10.22034/chemm.2018.56141
Quetiapine Fumarate Syntheses and Its Determination Methods in the Pharmaceutical Dosage Forms, Human Plasma and Urine by RP-HPLC and Other Analytical Techniques: A Review
Mehdi
Rezaei
Department of Chemistry, University of Zanjan, P.O. Box: 45195-313, Zanjan, Iran.
author
Ali
Ramazani
Department of Chemistry, University of Zanjan, P.O. Box: 45195-313, Zanjan, Iran.
author
Fahimeh
Hokmabadi
Chemistry and Chemical Engineering Research Center of Iran, P.O. Box 14335-186, Tehran 1496813151, Iran
author
text
article
2018
eng
Background: Quetiapine fumarate is a dibenzothiazepine derivative and it is classified as a second-generation antipsychotic drug that has been established as an effective therapy for schizophrenia and bipolar disorder. These antipsychotics have a low incidence of extrapyramidal side effects and tardive dyskinesi as compared to older antipsychotics. The advantages of the therapeutic profile of quetiapine have led to increasing the use of the clinical practice encouraging the development of new pharmaceutical preparations. Objective: The goal of this work was to recognize the synthesis and analytical deference methods of quetiapine fumarate. Methods: Generally, A precise, specific, rapid and feasible reversed-phase high-performance liquid chromatographic (RP-HPLC), UV spectrophotometric and reversed phase ultra-performance liquid chromatography (RP-UPLC) methods for the determination of an antipsychotic drug quetiapine fumarate in pharmaceuticals, spiked human urine and plasma sample have been developed and collected in this review. The methods also find applications in clinical, biological and pharmacokinetic studies of quetiapine fumarate.
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
141
165
https://www.chemmethod.com/article_60130_f83a4bac39fdd2f62d79fbbfdcaddb38.pdf
dx.doi.org/10.22034/chemm.2018.60130
On The Characterization, Use and Wastewater Detoxification Potential of Pyrolyzed Moringaoleifera Pods and Shells PART B: Sorption Isotherm, Kinetic, and Thermodynamic study
Adams Udoji
Itodo
Department of Chemistry, Federal University of Agriculture Makurdi, Nigeria.
author
Raymond Ahulle
Wuana
Department of Chemistry, Federal University of Agriculture Makurdi, Nigeria.
author
Wombo Ngunan
Patience
Department of Chemistry, Federal University of Agriculture Makurdi, Nigeria.
author
text
article
2018
eng
In this study, previously estimated tannery effluent with high pollutant (Cr) load of 987 mg/L was detoxified using pyrolysed Moringaoleifera Pods(PMOP)and Shells (PMOS).A performance assessment of the gained and characterized adsorbents was based on equilibrium, rate and thermodynamic studies.An investigation was carried out on equilibrium studies using isotherm models (Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherm models).The maximum adsorption capacity of PMOS is 277.3 mg/g. Sorption rate is best explained using the Pseudo-second order kinetic model with diffusion through the liquid film surrounding the solid sorbent. Comparison of performance with commercially available activated carbon shows no statistical significance at p< 0.05.
Chemical Methodologies
Sami Publishing Company
2645-7776
2
v.
2
no.
2018
166
180
https://www.chemmethod.com/article_60131_06a60f2b80af198bc46a5e79e3c1b0c7.pdf
dx.doi.org/10.22034/chemm.2018.60131