bluuebunny/crossref_metadata_2025_split huggingface dataset:
Hydrogen Chloride Improved Selectivity of Lead Ionic Selective Electrode (Pb‐ISE) under High Calcium Concentration
Authors: Huang Wu‐Jang , Chiu Chen‐Min 
Published: May 2015

AbstractLeachants from the toxic characteristic leaching procedure (TCLP) of combustion residues, fly ash, usually contain calcium and lead ions as high as to 12000 and 1000 ppm, respectively. In this paper, the authors used a commercialized lead(II) ionic‐selective electrode (Pb‐ISE) to measure the lead(II) concentrations in such leachants and observed a serious interference from calcium(II) ions. The interference starts at the concentration ratio of ([Ca]/[Pb]) in the sample over 2.0. Reasons for the interference are not clear, but it can be suppressed by adding a chemical modifier, HCl(aq) solution, into the sample. The authors have found that the optimized addition amount in TCLP leachants is 4 mL of HCl(aq) per 20 mL sample, and the detection limit of the Pb‐ISE was 5.2 ppm.
Cetyltrimethylammonium Bromide as a Surface Modifier in Paper Separation of 2,4‐D and Silvex Herbicides from Aqueous Solutions
Authors: Wang Wan‐Kung , Liu Chih‐Hsien 
Published: May 2015

AbstractThe paper capillary permeation adsorption (PCPA) separation of 2,4‐D and silvex herbicides from water by the addition of cetyltrimethylammonium bromide (CTAB) was studied. The effect of pH, CTAB concentration, and the type of PCPA treatment on separatability has been investigated. A nearly 100% separatability was obtained for each of 2,4‐D and silvex at pH values larger than 7 and 5, respectively. The separatability is greater than that without an addition of CTAB. It was confirmed that 2,4‐D and silvex are adsorbed as molecules on the fiber surface that contains ion pairs CTA+COO− formed by the combination of CTA+ cations with the carboxyl groups bonded in the fiber surface.
Reaction of Pyrimidinonethione Derivatives: Synthesis of N‐Methyl‐2‐Hydrizinopyrimidine‐4‐One, Thiazolo[3,4‐b] N‐Methylpyrimidinone; 2‐(1‐Pyrazolonyl) N‐Methylpyrimidine‐4‐one and 2‐Hydrazino‐N‐Methyl Pyrimidine‐4‐One Derivatives
Authors: Al‐Shara'ey Abdullah A. Al‐Karim 
Published: May 2015

Abstract6‐Aryl‐5‐cyano‐4‐pyrimidinone‐2‐thion derivatives 1a‐c reacted with methyl iodide (1:2) to give the corresponding 2‐S,N‐dimethyl pyrimidine‐4‐one derivatives 2a‐c. Compounds 2a‐c were in turn, reacted with hydrazine hydrate to give the sulfur free reaction products 3a‐c. These reaction products were taken as the starting materials for the synthesis of several new heterocyclic derivatives. Reaction of 3a‐c with acetic anhydride and formic acid gave pyrimido triazines 4a‐c and 7a‐c, respectively. Their reactions with active methylene containing reagents gave the corresponding 2‐(1‐pyrazonyl)‐N‐methyl pyrimidine derivatives 9a‐c and 10a‐c, respectively. Their reactions with aromatic aldehydes afforded the corresponding 2‐hydrazono pyrimidine derivatives 11a‐c. The structure of these reactions products were established based on both elemental analysis and spectral data studies.
Synthesis of New Fused Hetecrocyclic Compounds of Benzpyrid‐4‐One Derivatives and Their Some Biological Activity
Authors: Soleiman H. A. , Koraiem A. I. M. , Mahmoud N. Y. 
Published: May 2015

AbstractA series of fused pyrazolino‐, Isoxazolino‐, Pyrimidino‐, Pyrimidinothino‐, thiazolidinones and β‐lactam incorporating benzpyrid‐4‐one derivatives have been synthesized by different methods of chemical reaction. The prepared compounds were established by universals and modern methods of physical and chemical confirmation.
Solid Supported Synthesis of New 2,4‐Dithioxo‐6‐aryl‐3‐(1′,3′,4′‐thiadiazolo)‐1,3,5‐triazines Using Microwaves
Authors: Kidwai Mazaahir , Mishra Akkal Deo 
Published: May 2015

AbstractA series of novel 2,4‐dithioxo‐6‐aryl‐3‐(1′,3′,4′‐thiadiazolo)‐1,3,5‐triazines have been synthesized from 1,3,4‐thiadiazolo‐thioureas and arylaldehydes using microwave irradiations (MWI) over inorganic solid supports. The yield afforded in microwave reactions was 80% whereas it was 60% in conventional reactions. Solid supported synthesis using microwaves has eliminated the usage of toxic substances and organic solvents except for the limited consumption of methanol and ethanol in pre and post reaction stages. This methodology has been proved an efficient, facile, rapid, and ecofriendly synthetic technology.
Studies with Functionally Substituted Methylbenzotriazoles: Novel Synthesis of Functionally Substituted Pyrazolo[5,1‐c]‐1,2,4‐Triazines Benzotriazol‐1‐yl, 1‐Pyrazol‐4‐yl Benzotriazoles and 1‐Isoxazol‐4‐yl Benzotriazoles
Authors: Hassanien Abu Zeid A. , Ghozlan Said A. S. , Elnagdi Mohamed H. 
Published: May 2015

Abstract1‐Benzotriazolylacetophenone 1 couples with aromatic diazonium salts to yield the corresponding coupling products 2. Reaction of 1 with diazotized aminopyrazole afforded the benzotriazolylpyrazolo[5,1‐c][1,2,4]triazine 6. Compound 1 condensed with DMFDMA to yield the enaminone 7 which reacted with hydrazines to yield the pyrazoles 8a,b. Isomeric pyrazoles 10 were synthesized via condensing 1 with phenyl‐hydrazine and subsequent condensation of the formed phenylhydrazone 9 with DMFDMA. Reaction of 7 with hydroxylamine afforded the isoxazole 11 which was converted into the nitrile 13 on reflux in dioxane in the presence of sodium hydride. Compound 13 was also directly obtained from reaction of 1 with 1‐cyanobenzo‐triazole. The reaction of 1 with hippuric acid and arylidenemalononitriles 18a‐c afforded the pyranone 17 and pyridine derivatives 23a‐c, respectively.
Syntheses of Substituted Naphthalenes and Naphthols
Authors: Huang Keng‐Shiang , Wang Eng‐Chi , Chen Hsing‐Ming 
Published: May 2015

AbstractSyntheses of substituted naphthalenes and naphthols are described. Based on Claisen rearrangement, ring‐closing metathesis (RCM), and related reactions, isovanillin was successfully transformed into a series of substituted naphthalenes and naphthols with good overall yields.
Calix[4]quinones III: The Synthesis of p‐Hydroxycalix[4]arenes by Wolff‐Kishner Reduction
Authors: Tsoo Ching‐Yu , Chen Rong‐Fua , Wang Wen‐You , Lin Lee‐Gin 
Published: May 2015

AbstractThe Wolff‐Kishner reduction of the half‐protected ketal calix[4]monoquinone 3 and its basic hydrolysis product 4 produced a partially reducing product 5. When the same reduction conditions were applied to the calix[4]quinone benzoates 1 and 2, the corresponding title compounds, p‐hydroxycalix[4]arenes (6 and 7), were afforded in one step.
An Efficient Method for the Preparation of Nitriles via the Dehydration of Aldoximes with Phthalic Anhydride
Authors: Wang Eng‐Chi , Huang Keng‐Shiang , Chen Hsing‐Ming , Wu Chung‐Chin , Lin Gwo‐Jiun 
Published: May 2015

AbstractA new and highly efficient method for the conversion of aldoximes to nitriles was established. By fusing with phthalic anhydride, aldoximes were efficiently and smoothly converted into nitriles, in high yields (over 85%) and in a short time (within 5 minutes). The mixture of phthalic anhydride, a cyclic anhydride, and aldoximes in fusing state set up an ideal transition state for a selective [3.3]‐sigmatropic rearrangement of the acylated aldoximes to nitriles.
Chemical Components of Seriphidium Santolium Poljak
Authors: Deng Yan‐Ru , Song Ai‐Xin , Wang Han‐Qing 
Published: May 2015

AbstractA new biflavonoid glucoside, apigenin‐7‐O‐β‐D‐glucopyranoside‐(3′‐O‐7″)‐quercetin‐3″‐methyl ether (1) together with twenty known compounds, apigenin (2), luteolin (3), chrysoeriol (4), tricin (5), hispidulin (6), pectolinarigenin (7), eupatilin (8), 5,7‐dihydroxy‐6,3′,4′,5′‐tetramethoxyflavone (9), 5,7,4′‐trihydroxy‐6,3′,5′‐trimethoxyflavone (10), 3,6‐O‐dimethylquercetagetin‐7‐O‐β‐D‐glucoside (11), 6‐hydroxy‐5,7‐dimethoxy‐coumarin (12), taraxerol (13), taraxeryl acetate (14), a mixture of β‐sitosterol (15) and stigmasterol (16), a mixture of the n‐alkyl trans‐p‐coumarates (17), a mixture of the n‐alkyl trans‐ferulates (18), 2‐hydroxy‐4,6‐dimethoxyacetophenone (19), 4‐hydroxy‐2,6‐dimethoxyphenol‐1‐O‐β‐D‐glucopyranoside (20), and 2‐hydroxycinnamoyl‐β‐D‐glucopyranoside (21), were isolated from the whole plant of Seriphidium santolium Poljak. The structures of these compounds were determined by means of spectral and chemical studies.
A New Thiophen Acetylene from Artemisia Absinthium
Authors: Yamari Abbas , Boriky Driss , Bouamrani M. L. , Blaghen M. , Talbi Mohammed 
Published: May 2015

AbstractThe investigation of the dried roots of A. absinthium afforded two known lignans of tetrahydrofuran skeleton, sesamin and yangambin, one known coumarin, 6‐methoxy‐7,8‐methylenedioxy coumarin and a new thiophen acetylene. The structures were elucidated by spectroscopic methods.
Purification and Characterization of Three Lectins Extracted from Cassia Fistula Seeds and Effect of Various Physical and Chemical Agents on Their Stability
Authors: Ali M. Abbas , Sayeed M. Abu , Absar Nurul 
Published: May 2015

AbstractThree lectins designated as CSL‐1, CSL‐2 and CSL‐3 were purified from Cassia fistula seeds by gel filtration on Sephadex G‐50 followed by ion‐exchange chromatography on DEAE cellulose and finally by affinity chromatography on Sepharose 4B. The molecular weights of the lectins CSL‐1, CSL‐2 and CSL‐3, determined by gel filtration on Sephadex G‐75 column were 37,000, 42,400 and 46,000, and by SDS gel electrophoresis were 37500, 42000 and 46500, respectively. All three lectins agglutinated rat red blood cells and the agglutination was inhibited specifically by galactose and galactose containing saccharide. The neutral sugar contents of the lectins, CSL‐1, CSL‐2 and CSL‐3 were estimated to be 3.5, 3.1 and 2.0%, respectively. The sugar composition of the lectins was found to be galactose in CSL‐1, galactose and glucose in CSL‐2, and galactose and mannose in CSL‐3. The lectins exhibited maximum hemagglutinating activities around pH 7.2 to 7.5 and at a temperature range of 20° to 35 °C. Biological activities of the lectins were abolished sequentially with the increase in concentration of acetic acid and denaturant solutions such as urea and guanidine‐HCl.
pH Dependent Thermal Stabilization of DNA by Glcβ(1→3)GlcNAcβ1→STol
Authors: Lin Chun‐Cheng , Hung Sue‐Mei , Lu Kuo‐Cheng , Cheng Chien‐Chung 
Published: May 2015

AbstractA disaccharide, Glcβ(1→3)GlcNAcβ1→STol (GGS, 1), was synthesized and demonstrated to stabilize ct‐DNA during the denaturing process. GGS at 50 μM shifted Tm of ct‐DNA by 23 °C and the behavior was pH dependent. Poly(dA‐dT)2 was found to be the preferable type of DNA for GGS stabilization by circular dichroism spectroscopy study.
Cytotoxic Constituents from the Stem Bark of Zanthoxylum Pistaciiflorum
Authors: Chen Jih‐Jung , Huang Hung‐Yi , Duh Chang‐Yih , Chen Ih‐Sheng 
Published: May 2015

AbstractTwo new esters, methyl 4‐(prenyloxy)dihydrocinnamate and methyl 4‐(geranyloxy)dihydrocinnamate, together with fourteen known compounds have been isolated from the stem bark of Zanthoxylum pistaciiflorum. The structures of two new compounds were determined through spectral analyses. Among the isolates, four compounds exhibited effective cytotoxicities against P‐388 and HT‐29 cell lines in vitro.
Sorptive Enrichment of Sulfur Compounds from Gaseous Samples on Polydimethylsiloxane
Authors: Sye Wen‐Fa , Chen Yen‐Chun , Tai Jia‐Wen 
Published: May 2015

AbstractA method has been developed for preconcentrating the volatile sulfur compounds from gaseous samples using a trap filled with a sorption material, polydimethylsiloxane(PDMS), without the need for extensive cryotrapping with liquid cryogens. The system is based on enrichment of the solutes on a packed bed of 50% (w/w) PDMS on solid support without cryotrapping and is then analysed by using thermal desorption followed by capillary column (GS‐GASPRO) gas chromatography with simultaneous sulfur‐selective detection. The practicality of the system was demonstrated by the analysis of natural gas. Using the system described here, the sulfur gaseous compounds known to cause nuisance odors in the natural gas could be quantitatively trapped. The application of 50% PDMS on silcoport™ for the analysis of sulfur compounds from gaseous samples has been proved to be useful.
Membrane Filtration of Iron(III), Copper(II) and Lead(II) Ions as 1‐(2‐Pyridylazo) 2‐Naphtol (PAN) for Their Preconcentration and Atomic Absorption Determinations
Authors: Soylak Mustafa , Erdoǧan Nilgun Develioglu , Elci Latif 
Published: May 2015

AbstractA membrane filtration procedure for the preconcentration and atomic absorption spectrometric determination of Pb(II), Co(II) and Fe(III) ions in natural water samples has been established. Cellulose nitrate membrane filters (0.45 μm and 47 mm diameter) were used in all experiments. The procedure is based on chelate formation of the analyte metals with 1‐(2‐pyridylazo) 2‐naphtol (PAN) and on retention of the chelates on cellulose nitrate membrane filter. The cellulose nitrate membrane and analyte ions were completely dissolved by 500 μL of nitric acid at 85 °C on a hood and then metal determinations were performed by flame atomic absorption spectrometry. The method was applied to natural water samples for the determination of analyte ions with satisfactory results, e.g., recoveries > 95%, RSD's < 10%.
Synthesis and Electroluminescence of Metal 4‐Styryl‐8‐hydroxyquinolates
Authors: Chen Mon‐Yao , Hsu Ming‐Ann , Liu Ching‐Yang , Chow Tahsin J. 
Published: May 2015

AbstractAluminum and zinc complexes of 4‐substituted 8‐hydroxyquinoline were used effectively as emissive materials in light‐emitting diodes (LED). The substituents chosen in this study were p‐methoxy‐2‐styryl, p‐diethylamino‐2‐styryl, and naphthalene‐2‐vinyl groups. Their emission spectra were red‐shifted with respect to that of aluminum tris(hydroxylquinolate) (Alq3) as a result of extending their π‐conjugation. All complexes formed amorphous glasses, which exhibited high thermal and electrical stability. Typical LED devices were fabricated by mixing the dyes with polyvinylcarbazole and spin‐coated to form thin films, which were sandwiched between ITO (indium tin oxide) and a metal electrode. These devices displayed yellow‐orange emissions with quantum efficiency ca. 0.4%.
Development of the Headspace SPME/ATR‐IR Method for Detection of Chlorinated Aromatic Compounds in Soils
Authors: Yang Jyisy , Shih Wan‐Ying , Meng Fan‐Chun 
Published: May 2015

AbstractIn this paper, a new method based on attenuated total reflection infrared (ATR‐IR) spectroscopy was developed to detect chlorinated aromatic compounds in soil. To eliminate the problems associated in inspection of soil samples by the ATR‐IR method, chlorinated compounds were evaporated from soil matrices and detected in the headspace. The sensing device was constructed by an internal reflection element (IRE) coated with a hydrophobic film to attract and concentrate chlorinated compounds evaporated to the headspace. Factors that influence the analytical signals were studied such as the moisture content, volatilities of analytes, and effect of heating temperature. Results indicated that the addition of thermal energy to the soil sample resulted in an increase of IR signal. However, the IRE was also warmed up and caused a slight decrease of the IR signals after a long detection time. The studies of the influence of moisture indicated that a small amount of water present in soils could tremendously increase the intensity of detected IR signals. The further increase of moisture contents resulted in a decrease of the analytical signals, and the optimal signal was found when soil samples contained 5% (v/w) water. Results in analyses of compounds with different volatilities indicated that even with vapor pressure lower than 0.017 Torrs, quality IR spectra could still be obtained. Using the optimal conditions found in this work, the results in determination of five compounds in soil samples indicated that the linear regression coefficients (R‐square) were higher than 0.992 with detection limits around a few hundreds of ppb.
Synthesis and Antibacterial Activity of Some 3,5‐Diphenyl and 1,3,5‐Triphenyl‐2‐pyrazolines
Authors: Shinde Sunita , Jadhav Wamanrao , Pawar Rajendra , Bhusare Sudhakar 
Published: May 2015

AbstractSome new 3,5‐diphenyl and 1,3,5‐triphenyl‐2‐pyrazolines derivatives were synthesized by reacting 1,3‐diphenyl‐2‐propen‐1‐ones with hydrazine hydrates and phenyl hydrazine in ethanol. The structural elucidation of the compounds was performed by IR, 1H NMR and elemental analysis. All examined compounds showed appreciable antibacterial activity.
Syntheses of 4‐Alkoxy‐3‐methoxy‐5H‐benzocycloheptenes and 2‐Alkoxy‐3‐methoxy‐5H‐benzocycloheptenes from Isovanillin via Claisen Rearrangement and Ring‐closing Metathesis
Authors: Huang Keng‐Shiang , Wang Eng‐Chi , Chen Hsin‐Ming 
Published: May 2015

AbstractNew syntheses of 4‐alkoxy‐3‐methoxy‐5H‐benzocycloheptenes and 2‐alkoxy‐3‐methoxy‐5H‐benzocycloheptenes were studied. Based on Claisen rearrangement, O‐alkylation, nucleophilic addition of allyl magnesium bromide, ring‐closing metathesis, and dehydration, a series of new 4‐alkoxy‐3‐methoxy‐5H‐benzocycloheptenes and 2‐alkoxy‐3‐methoxy‐5H‐benzocycloheptenes were respectively synthesized from isovanillin in good overall yields.
A Rapid and Convenient Method for Preparing Acylhydrazines from Acyldiazenes
Authors: Li Jian‐Ping , Yu Shu‐Qiang , Qu Gui‐Rong , Wang Yu‐Lu 
Published: May 2015

AbstractThe synthesis of acylhydrazines by using hydrazine hydrate as the reductant to hydrogenate acyldiazenes is reported. Twelve acylhydrazines have been synthesized from acyldiazenes in excellent yields under mild conditions. This method is rapid, convenient, and efficient.
The Synthesis and Chemistry of 1,3‐Bridged Polycyclic Cyclopropenes: 8‐Oxatricyclo[3.2.1.02,4]octa‐2,6‐dienes
Authors: Lee Gon‐Ann , Chang Chih‐Yi , Cherng Chih‐Hwa , Chen Chi‐Sheng , Liu Mei 
Published: May 2015

AbstractThree 1,3‐bridged polycyclic cyclopropenes, exo‐8‐oxatricyclo[3.2.1.02,4]octa‐2,6‐diene (10), endo‐8‐oxatricyclo[3.2.1.02,4]octa‐2,6‐diene (11), and exo‐6,7‐benzo‐1,5‐diphenyl‐8‐oxatricyclo[3.2.1.02,4]octa‐2,6‐diene (12), have been synthesized by elimination of 2‐chloro‐3‐trimethylsilyl‐8‐oxatricyclo[3.2.1.02,4]‐oct‐6‐enes, 17, 18 and 30, which were generated from 1‐chloro‐3‐trimethylsilylcyclopropene with furan and diphenylisobenzofuran. We have demonstrated a facile route to synthesize the highly strained 1,3‐fused polycyclic cyclopropenes, 10, 11, and 12. The stereochemistry of the Diels‐Alder reactions of cyclopropene 16 with furan and DPIBF are different. Cyclopropene 16 was treated with furan to form exo‐exo and endo‐exo adducts (5:2) and treated with DPIBF to generate an exo‐exo adduct. Compounds 10, 11 and 12 undergo isomerization reactions to form benzaldehyde and phenyl 4‐phenyl‐[1]naphthyl ketone to release strain energies via diradical mechanisms.
Benzofuran Derivatives from Ligularia Stenocephala
Authors: Yan Fu‐Lin , Wang Ai‐Xia , Jia Zhong‐Jian 
Published: May 2015

AbstractFour new benzofuran derivatives were isolated from the roots of Ligularia stenocephala; they were named as ligustenin A (1), B (2), C (3) and D (4), and the structures were established by spectroscopic methods including 2D NMR techniques. Ligustenin A (1) was found to exhibit potent anti‐tumor activity against HL‐60 (human leukemia cells), Bel‐7402 (human hepatoma cells) and HO‐8910 (human ovarian neoplasm cells) with IC50 values of 18.6, 27.6 and 57.5 μM, respectively.
Chemical Constituents from Annona Glabra
Authors: Hsieh Tian‐Jye , Wu Yang‐Chang , Chen Su‐Ching , Huang Ching‐Shan , Chen Chung‐Yi 
Published: May 2015

AbstractA new kaurane diterpenoid, annoglabasin G (16α‐hydro‐19‐acetoxy‐ent‐kauran‐17‐al) (1), along with 27 compounds including 18 kaurane diterpenoids, 16β‐hydro‐ent‐kauran‐17‐oic acid (2), 16α‐hydro‐ent‐kauran‐17‐oic acid (3), 19‐nor‐ent‐kauran‐4α‐ol‐17‐oic acid (4), 16α‐hydro‐19‐ol‐ent‐kauran‐17‐oic acid (5), ent‐kaur‐16‐en‐19‐oic acid (6), 16α‐hydroxy‐ent‐kauran‐19‐oic acid (7), 16α,17‐dihydroxy‐ent‐kauran‐19‐oic acid (8), 16β,17‐dihydroxy‐ent‐kauran‐19‐oic acid (9), 16α‐hydro‐ent‐kauran‐17,19‐dioic acid (10), 16β‐hydroxy‐17‐acetoxy‐ent‐kauran‐19‐oic acid (11), 16β‐hydro‐17‐hydroxy‐ent‐kauran‐19‐al (12), 16α‐hydro‐17‐hydroxy‐ent‐kauran‐19‐al (13), 16β,17‐dihydroxy‐ent‐kauran‐19‐al (14), 16α‐hydro‐19‐al‐ent‐kauran‐17‐oic acid (15), 16α‐hydro‐17‐acetoxy‐ent‐kauran‐19‐al (16), 16α‐hydro‐19‐acetoxy‐ent‐kauran‐17‐oic acid (17), ent‐kaur‐15‐en‐19‐oic acid (18) and ent‐kaur‐15‐en‐17‐ol‐19‐oic acid (19); four acetogenins, annomontacin (20), annonacin (21), isoannonacinone (22) and squamocin (23); four steroids, β‐sitosterol (24), stigmasterol (25), β‐sitosteryl‐D‐glucoside (26) and stigmasteryl‐D‐glucoside (27) and one oxoaporphine, liriodenine (28), were isolated from the fresh fruits of Annona glabra. These compounds were characterized and identified by physical and spectral evidence.
Comment on “Symbolic Calculation of Two‐Center Overlap Integrals Over Slater‐type Orbitals”
Authors: Guseinov I. I. 
Published: May 2015

AbstractPublished by Gümüş. and Özdoǧan formulas for the evaluation of two‐center overlap integrals (Gümüş, S.; Özdoǧan, T. J. Chin. Chem. Soc. 2004, 51, 243) are critically analyzed. It is demonstrated that the formulas presented in this work are not original and they can easily be derived from the relationships contained in our papers (Guseinov, I. I. J. Phys. B 1970, 3, 1399; Phys. Rev. A 1985, 32, 1864; J. Mol Struct. (Theochem) 1995, 336, 17) by changing the summation indices and application of a simple algebra. It should be noted that the symbolic results of overlap integrals between different combinations of quantum numbers given in Table 1 and 2 can also be obtained from the use of established in above mentioned our papers general formulas or presented in the literature relations for overlap integrals in terms of the products of molecular auxiliary functions An(p) and Bn(pt) (see, e.g., Lofthus, A. Mol. Phys. 1962, 5, 105).
Synthesis Characterization and Biological Screening of Tri‐benzyl Tin(IV) Complexes of Some Schiff Bases
Authors: Rehman Wajid , Badshah Amin , Baloch Musa Kaleem , Ali Saqib , Hameed Gulzar , Khan Khalid M. 
Published: May 2015

AbstractSynthesis and characterization of some novel di and tri‐benzyl tin(IV) complexes of some Schiff bases are reported. The 1H‐NMR, 13C‐NMR, 119Sn‐NMR, IR, Elemental Analysis and 119Sn Mössauber studies are made for structural determination. Spectroscopic data reveals that the ligand molecule is bound to the tin atom through oxygen. On the basis of spectroscopic data tetrahedral geometry is proposed for the synthesized compounds. The synthesized compounds have been tested against various microorganisms. The results obtained show that the synthesized compounds have promising activity against all the tested micro‐organisms.
Strengthening of Anticorrosion Passivity by Newly Developed Multi‐silicon Coatings
Authors: Hashem Khaled M. E. 
Published: May 2015

AbstractThe combination of ultrasonic vibratory beam and gas chromatography‐mass spectrometry techniques was used to produce monomers of new organo‐multi‐silicon coating materials. The reactants of these materials were exposed to high passive conditions through all the experimental phase. By the aid of a capillary column, RTX‐5MS, and an EI detector of the Finnigan‐Mat GC, a sample was analyzed on the basis of the rules of the predominant M‐1(s) ions of the main chromatographic pattern. Fragmentation analysis of the high resolution mass spectrometry patterns led to detection of three new compound structures, designated A, B, and C isomers. These isomers were identified by the differences between their retention times. The mechanistic root for each of the three isomers is fully discussed herein by a process of stepped number of cleavages per molecule.