bluuebunny/crossref_metadata_2025 huggingface dataset:
Spectrophotometric Studies on the Chelate Formation between Zirconium(IV) and Chromotrope 2R
Authors: Drupar S. C. , Srivastava K. C. , Banerji Samir K.
Published: June 2015

The composition and stability of the chelate formed between Zr(IV) and chromotrope 2R has been investigated using spectrophotometric methods. The chelate is violet in color and has λmax at 530 nm. The composition, determined by different methods is 1 : 1. The chelate is stable between pH 1.0‐3.0. The value of log K as determined by two different methods are 4.48±0.2 and 4.21±0.1 and the values of free energy of formation are —6.21±0.2 and —5.83±0.1 respectively at 30°C. The system obeys Beer's Law over a concentration range of 2.50 to 20.0 ppm of zirconium. The effective range of photometric determination is 3.50 to 19.05 ppm of zirconium.
Thermodynamics of Lanthanum Fluoride in Aqueous Sodium Perchlorate
Authors: Pan Kuan , Hsin Shu‐Ching , Leee Ming‐Long
Published: June 2015

The solubility‐product constant of LaF,(s) was obtained by potentiometric titration of sodium fluoride with lanthanum perchlorate in sodium perchlorate solutions of various ionic strengths. The limiting value of pKs.p were found to be 17.65 and 17.95 at 20° and 25°C, respectively. Thermodynamic calculation from these values gives δG° =‐102.46 kJ mol−1, δH° = 100.40 kJ mol−1 and δS° = 680.40 JK−1 for the reaction, La+3 (aq)+3F‐(aq)=LaF,(s), and δG° =‐1613.8kJ mol‐1, δH1° =‐1594.0kJ mol−1 and S° =433.1 J K−1 mol−1 for the formation of LaF2,(s) at 25°C. The mean activity coefficients and solubilities of LaF2,(s) in NaCIO4 solution at various ionic strengths at 25°C were evaluated.
Synthesis of N,N2‐Disubstituted DL‐β‐Asparagines as Potential Hypocholesteremics
Authors: Liu Kang‐Chien , Chen Tong‐Bao , Shih Ching‐Yun
Published: June 2015

By the addition of equivalent amount of appropriate amine on the carbon‐carbon double bond of N‐substituted maleamic acids under the influence of pyridine, a number of potential hypocholesteremics, N,N2‐disubstituted DL‐β‐asparagines was prepared. For all N‐alkyl‐ and N‐arylmaleamic acids, the addition proceeded smoothly and resulted in satisfactory yields, but in the cases of N‐heterocyclic analogs, transamidation was observed to occur simultaneously with the addition reactions.
Physico‐Chemical Studies on the Interaction of Surface Active Substances at the Dropping Mercury Electrode in Pulsating Field
Authors: Sharma S. K. , Rema R.
Published: June 2015

The tensammetric measurements indicated an appreciable interaction of o‐cresol with piperidine as well as with triethanolamine in aqueous media. The sharp discontinuities in the mixtures of o‐cresol + piperidine and o‐cresol + triethanolamine at the mole ratio 3:1 for o‐cresol to amine are observed by tensammetric, conductommetric and high frequency measurements. The shift of peak potential as well as increase in the magnitude of peak of the mixture have been utilized in determining the composition of the complexes by tensammetric measurements. The nature of formation of such complexes has been predicted. The nature of such interactions have been investigated by infra‐red studies. The molar ratio of phenol to amine (piperidine and triethanolamine) are also estimated to be 3:1.
Spectrophotometric Determination for Trace Amount of Chloride in Uranium
Authors: Chu Chi‐Fen , Wu Shaw‐Shii
Published: June 2015

A simple quantitative method is developed for the determination of trace amount of chloride in uranium without preliminary separation. The reactions are realized by mixing the sample with saturated mercury thiocyanate alcohol solution and 0.325M ferric ion in 5.52M perchloric acid solution. The wavelength 465 mμ is used for the determination of chloride. The interference of uranium is negligible for uranium concentration less than 400 ppm. When uranium concentration ranges from 400 to 1.2×104 ppm, the interference can be calculated based on the constancy of molar absorptivity of uranium solution at wavelengthes 465 mμ and 415 mμ, therefore, a correction can be made for the determination of chloride. Interference of other factors were also investigated.
Reduction of Organic Compounds with Thiourea Dioxide I. Reduction of Aldehydes to Primary Alcohols
Authors: Huang Shui‐Lung , Chen Teng‐Yueh
Published: June 2015

Benzaldehyde, 2‐pyridinecarbaldehyde, furfural, and 2‐thiophenecarbaldehyde were reduced to the corresponding primary alcohols in satisfactory yields with thiourea dioxide in ethanolic alkaline solution, but 2‐pyrrolecarbaldehyde, in very low yield. The reduction of p‐dimethylaminobenzaldehyde with the same reagent, however, was found to afford bis(4‐dimethylaminophenyl) methane.
Cobalt Complex of l‐(2‐Quinolylazo)‐2‐Phenanthrol(Co‐Qap) as a Visual Acid‐Base Indicator
Authors: Virmani R. N.
Published: June 2015

Cobalt complex of 1‐(2‐quinolylazo)‐2‐phenanthrol (Co‐QAP) prepared by refluxing cobalt acetate and QAP in the molar ratio 1:2 has been used as a visual acid‐base indicator. The apparant indicator constant has been found to be 6.35. The solution of the indicator in dioxane is stable for at least fifteen days if stored in a dark coloured bottle, while in a transparent bottle it was found to be stable for eight days.
Preparation of Complexes of Copper(II) Aryl Carboxylates with Diethyl Amine and Dipropyl Amine
Authors: Kumar N. , Kalsotra B. L.
Published: June 2015

Copper aryl carboxylates are known to form co‐ordination complexes with various nitrogen donors1‐4). Except copper (II) benzoate5) complexes of other copper (II) aryl carboxylates with secondary amines such as diethyl amine and dipropyl amine are not known. The present communication deals with the preparation of complexes of various copper (II) aryl carboxylates with diethyl amine and dipropyl amine.
Thiotropolone as a Chromogenic Reagent for the Microdetermination of Copper(II)
Authors: Srivastava J. N. , Singh R. P.
Published: June 2015

Thiotropolone forms a brown water‐insoluble complex with copper(II), extracttable into chloroform and other non‐polar solvents. The 1:2 complex shows maximum absorption at 450 nm and obeys Beer's law upto 4.55 ppm. The sensitivity of the reaction is 0.0046 μg Cu(II)/cm2 for log I0/I=0.001 with molar absorptivity of 1.36×104. The usefulness of the procedure has been enhanced to the determination of copper in various alloys and synthetic mixtures.
Spin‐Spin Interactions of Trapped Radicals Produced in 3‐Methylpentane by Gamma‐Irradiation at 77°K
Authors: Lin D. P.
Published: June 2015

EPR microwave power saturation technique has been applied to the systems of radiation‐induced radicals in protiated and wholely deuterated 3‐methylpentane to obtain the information concerning the high local spin concentration and radiation energy deposition mechanism. Evidences of spin‐spin interactions have been given from the studies of isothermal decay of these trapped radicals at 77°K. The annealing of the matrix is shown to have almost no effect on the relaxation times of radicals. The influence of nuclear magnetic moment on the spin‐lattice relaxation process of radicals is revealed and discussed on the basis of experimental results from the deuteration of the compound studied.
Reduction of Organic Compounds with Thiourea Dioxide II. The Reduction of Organic Nitrogen Compounds
Authors: Huang Shui‐Lung , Chen Teng‐Yueh
Published: June 2015

Reduction of nitrobenzene with thiourea dioxide gave aniline and hydrazobenzene depending on the concentration of sodium hydroxide. Azobenzene and azoxybenzene were found to offer hydrazobenzene as the final product by the same reagent.
Determination of Inorganic Pollutants in River Water with Ion Selective Electrode
Authors: Chu Chi‐Fen , Chang Fu‐Chung , Lee Rong‐Jian , Tsai Hui‐Tuh , Wu Shaw‐Shii
Published: June 2015

A method of ion selective electrode was proposed for the analysis of inorganic pollutants such as silver, lead, cadmium, cyanide, fluoride and bromide in river water. Samples taken from five areas, Bih‐Tarn, Wan‐Lung, Taipei Shui‐Yuan‐Ti, Guei‐Shan Industrial Area and Dah‐Hahn‐Shi were analyzed in this investigation.

Under the conditions of this work, the ion activities were measured down to 10−7M, and precision of all ions was within ±2%. This method is very simple and precise and is recommended for the analysis of polluted water.
Studies on the Constituents of Murraya Paniculata Jack (I)
Authors: Wu Tian‐Shung , Lin Chung‐Nan , Yang Ling‐Kuang , Lin Shaw‐Tao
Published: June 2015

The components of the flowers and fruits of Murraya paniculata (L.) Jack (Rutaceae) were examined. Scopolin, scopoletin and glucose from the former, and scopoletin and glucose from the latter were isolated and identified, respectively.
Kinetic Studies on the Oxidation of Germanium(II) with Chlorate by Polarographic Analysis
Authors: Pan Kuan , Chen Jie‐Shung , Huang Teh‐Shoon
Published: June 2015

The rate of oxidation of Ge(II) chloride by large excess of ClO2− ions in HCl, NaCl and Na2SO4 mixed solutions was polarographically observed at various H2O+ and Cl− ion concentrations. The observed rate constant, kobs, is expressed by ko=Kobs/(ClO3−)={k1,(H+)+k2K1(Cl−)2+ K3K2(SO42−)} (H+)/{(H+)1+K1(Cl‐)2 +K2(SO42−)} for the following reaction processes,

The values were obtained aa k1=1.5410‐3liter2 mole2− sec‐1, k2=5.00×10‐2liter2 mole2− sec‐2 and k2=4.30×10‐3liter2 mole2− sec‐2, K1=1.80× 10‐2, K2= 2.43×10‐2 mole liter‐1 at constant ionic strength I=0.50 M at 30°C.
On the Nature of Electron Traps in Hydrocarbon Glasses at Low Temperatures
Authors: Lin D. P.
Published: June 2015

A delicate application of the EPR linewidth theory to the experimentally measured trapped electron (e−ϵ) linewidths in three kinds of isotopic 3‐methyl‐pentane molecules (3MP) concludes that the electron traps are formed by the protons regardless of their relative positions in the molecule. With the cavity radius of <2 Å, the trapped electron charge density in these nonpolar hydrocarbon glasses is shown to be highly delocalized. The slower thermal decay rate of e−ϵ 3MPd14 than in 3MPh14 is most likely related to the deeper trap depth in the former than in the latter leading to a predicted blue shift absorption peak for e−ϵ in 3MPd14 relative to that in 3MPh14 The farther travel distance for mobile electrons before being trapped in these matrices than in polar matrices is attributed to the low trapping cross section rather than a low trap density. Consistency of the empirical cavity radius with the predicted value from current theoretical basis is also cited.
Approximate Self‐Consistent Molecular Orbital Theory I S‐P Separation Model Modification of CNDO‐MO
Authors: Chen Cheng , Chen S. C. , Leu S. W.
Published: June 2015

A newly developed approximate self‐consistent molecular orbital formulation, so called: ‘s–p separation model CNDO‐MO method’, is proposed. The Pariser Parr1) and Nishimoto Mataga2) approximations are separately applied to the ns and np (n=l to 3) AO's. The MO's of both closed and open shell cases are formulated. It seems to be a good method for molecular structure interpretation for both polar and nonpolar compounds.
Approximate Self‐Consistent Molecular Orbital Theory II. CNDO‐MO Calculation of Methane Chlorine Derivatives
Authors: Chen S. C. , Chen Cheng
Published: June 2015

The CNDO‐MO method with s‐p separation model modification described in our former work1) is used here. Methane and it's chlorine derivatives are selected as the model molecules for such calculation. The nuclear coordinates are chosen from microwave spectroscopic data2). Both the self consistent behavior and the invariance of orthogonal transformation2) are quite successfully by preformed through the computation procedure. The ionization potentials predicted by Koopmans' theorem are reasonably good. The charge distribution and dipole moments of each case are calculated, and the results obtained by variation of bond parameter β are compared with the available experimental data satisfactorily.
Complexes of Copper (II) Aryl Carboxylates with 2, 6‐Lutidine
Authors: Kumar N. , Kalsotra B.L. , Sharma N.K.
Published: June 2015

Copper (II) aryl carboxylates are known to form co‐ordination complexes with various oxygen and nitrogen donors such as pyridine‐N‐oxide1), quinoline and isoquinoline2) diethylamine and dipropylamine1). There is no reference in literature regarding the preparation of complexes of copper (II) aryl carboxylates with 2,6‐lutidine. The present communication describes the preparation of complexes of various copper (II) aryl carboxylates with 2,6‐lutidine in acetone or ethylacetate medium.
Studies on the Components of Formosan Cirsium Species.: Part III Flavonoids of Cirsium Kawakamii Hayata and Cirsium Wallichii DC
Authors: Lin Chung‐Nan
Published: June 2015

A flavone glycoside, luteolin‐7‐glucoside (II) was isolated from the aerial portion of Cirsium kawakamii Hayata, and a dibasic acid, fumaric acid (III) was isolated from the aerial portion of C. wallichii DC.
PMR Spectroscopy Studies on Hydrogen Bonding of Iodoform with Several Proton Acceptors
Authors: Chen Ching‐Kaung , Chen Tunli
Published: June 2015

The Benesi‐Hildebrand method was used in NMR Spectroscopy to study the hydrogen bonding of iodoform with ten proton acceptors in cyclohexane at 25.0°C. The values of K's (M‐1) and Δc's (H2) of iodoform systems were determined as followings: N, N–dimethylacetamide, 0.73, 50.5; cyclohexylamine, 0.64, 40.6; cyclohexanone, 0.65, 38.9; cyclopentanone, 0.62, 41.5; 3–pentanone, 0.53, 36.0; acetone, 0.56, 35.0; ethylacetate, 0.51, 32.8; dioxane, 0.54, 31.3; tetrahydrofuran, 0.53, 28.8; diethylether, 0.36, 20.7. The experimental results were discussed. The H–bonding strength decreases in the order as: N, N–dimethylacetamide>cyclohexylamine≈︁ ketone>ester>ether.
Selectivity in the Catalytic Hydrogenation of 2‐Hydroxycyclohexanone
Authors: Chen Chau‐Yang , Huang Shun‐Chueh , Chen Sheng‐Chih
Published: June 2015

The catalytic hydrogenation of 2–hydroxycyclohexanone has been investigated on ruthenium, nickel, rhodium, platinum and palladium. The reaction was completed usually within several hours under an atmospheric pressure of hydrogen at room temperature. It was found that ruthenium and nickel catalysts produce more cis–cyclohexane–1, 2–diol than trans‐diol; while platinum and palladium catalysts give rise to more trans–diol than cis– form.

Two adsorbed models, weak and strong, for the substrate were presented to account for the observed hydrogenation selectivity.
Preparation of Complexes of Copper (II) Aryl Carboxylates with Morpholine
Authors: Kumar N. , Kalsotra B. L. , Suri A. K.
Published: June 2015

Complexes of copper (II) aryl carboxylates with morpholine were prepared by the interaction of the copper carboxylate with the morpholine equimolar as well as in large excess quantities in acetone medium. The complexes isolated correspond to 1:1 and 1:2 stoichiometry.

In continuation of our work on the preparation of complexes of copper (II) aryl carboxylates with nitrogen donors like aliphatic amines,1) heterocyclic amines2) and pyridine–N–Oxide3), the present communication deals with the preparation of complexes of copper (II) aryl carboxylates with morpholine.
Studies on the Ion Exchange Separation of Aspirin, Salicylic Acid and Acetic Acid
Authors: Hsu Tong‐Jung , Llao Chi‐Chow
Published: June 2015

The liquid chromatography of aspirin, salicylic acid and acetic acid using cation exchange resins with aqueous alcohol and water as eluent was described. The results indicated that acetic acid could be separated from aspirin and salicylic acid by hydrogen form cation exchange resin with 25% ethanol or water as eluent. The possibility of using this method to determine the degree of hydrolysis of aspirin was discussed.
Studies on the Constituents of the Root‐Bark of Hernandia Ovigera L. (III)
Authors: Yang Tsang‐Hsiung , Liu Shih‐Chih , Lin Ten‐Shi , Yang Li‐Ming
Published: June 2015

In the course of continuing search for the constituents of the root‐bark of Hemandiu ovigera L., led to the isolation of eight compounds: desoxypodophyllotoxin(I), thalicarpine(III)) dehydrothalicarpine(IV), ovigerine(V), hernangerine(VI), hernandonine(VIII) and two unknown substances, mp. 219–220° and mp. 269–270°. Desoxypodophyllotoxin( I) and thalicarpine(III) exhibited a distinctively cytotoxic activity against nasopharynx carcinoma was reported by S. M. Kupchan et.al3,9. Dehydrothalicarpine( IV) is merely a dehydro product of thalicarpine(III) at C–6a and C–7 of aporphine moiety. The isolation of dehydrothalicarpine(IV) made the first instance from Hernandia ovigera L. Comparison of their components distribution in each part of Hernandia ovigera was shown in Table I.
The Studies of Lanthanide Shift Reagents in NMR Spectroscopy
Authors: Wei Ho‐Hsang , Hwang Jon‐Mou
Published: June 2015

The action of a series of lanthanide chelate complexes LnL3, where Lu=La, Pr, Nd, Sm, Eu, Dy, Ho, Er and Yb; L= dbm (dibenzoylmethanato), dpm (dipivaloylmethanato), and acac acetylactonato), on nmr spectra of 2‐butanol has been studied. The origin of shifting abilities and shifting sign of various lanthanide ions are explained by means of Bleaney's theory.
Effect of High Order Coulombic Interaction on Radiationless Resonance Transfer of Electronic Excitation
Authors: Lin K. C.
Published: June 2015

The decay of sensitizer phosphorescence in a rigid solution modified by the electronic energy transfer by the mechanism of dipole‐dipole interaction mixing with the dipole‐quadrupole interaction is proposed. The rate constant for the transfer process transfer process as (equation).where (equation).

Calculations are made of the yield and the decay time of the sensitizer phosphorescence as functions of the activator concentration and the mixing coefficient of dipole‐dipole interaction with dipole‐quadrupole interaction. It is hoped that the proposed mechanism will provide a sound, quantitative basis for analyzing experimental data in a triplet‐singlet energy transfer process. As a demonstration, results indicate that about 9% of the electronic energy radiationlessly transferred from triplet triphenylene‐d12 to singlet Rhodamine B is induced by the electric dipole‐quadrupole coulombic interaction.
Synthesis of Taiwan Cobra Venom Cardiotoxin II Synthesis of Protected Hexapeptide, Sequence 44‐49 and Protected Tripeptide, Sequence 50‐52
Authors: Kong Fann‐Tong , Lin Tz‐Chien , Wong Chi‐Huey , Wang Kung‐Tsung
Published: June 2015

The protected hexapeptide (sequence 44‐49) and the protected tripeptide (sequence 50‐52) of Taiwan Cobra (Naja naja atra) venom cardiotoxin were synthesized by stepwise coupling and fragment coupling methods. The protected hexapeptide is Nps‐Lys(Z)‐Ser‐Ser‐Leu‐VaI‐Leu‐OMe and the protected tripeptides are Nps‐Lys(Z)‐Tyr(Bzl)‐Val‐OMe and Boc‐Lys(Z)‐Tyr(Bzl)‐VaI‐OMe.
9‐Trimethylsilylphenanthrene and 9‐Trimethylsilyl‐9,10‐Dihydroanthracene
Authors: Liu Sheng‐Lieh , Hwang Rong‐Ju , Wu Wen‐Jen , Yang Mei‐Huei
Published: June 2015

9‐Trimethylsilylphenanthrene and 9‐trimethylsilyl‐9,10‐dihydroanthracene were synthesized, the latter being photosensitive and oxidizable in exposure to air. When pulverized, the latter electrically charged negative.
Resonance Fluorescence of Gaseous Chlorine Excited by Laser Light
Authors: Choe Jim‐Son , Chang Hua , Hwang Dah‐Min
Published: June 2015

A powerful argon ion laser was used to excite gaseous chlorine molecules resonantly from the X1Σ ground electronic state to the excited electronic state. Three progressions of P, R doublets which correspond to the excitation from J=37, 13 and 39 of v=0 of the X1Σ state to v′=22, J′=38; v′=18, J′=12 and v′=16, J′=38 of the state, respectively, and then decaying to various vibrational levels of the X1Σ state were observed. Of those, only the excitation from v=0, J=38 to v′=22, J′=38 transition has been reported before. Due to the extremely small transition probabilities, the spectral lines are much weaker than those of iodine and bromine. Their positions and their relative intensities were analyzed and compared with the result calculated from the known molecular constants and with the known Franck‐Condon factors. Our data are consistent with the calculated results within the range of experimental error.
Studies on the Synthesis of the Sydnone Derivatives and its Properties IV: The Diarylation of Sydnone Compound
Authors: Tien Hsien‐Ju , Yeh Mou‐Yung , Lian Chong‐King
Published: June 2015

In the presence of H2SO4, the sydnone rings were condensed with formaldehyde to give diarylation in 4‐position of the sydnone rings: 3,3′‐diphenyl‐4,4′‐methylenedisydnone is obtained from 3‐phenylsydnone in 61% yield, and 3,3′‐di‐p‐methylphenyl‐4, 4′‐methylenedisydnone is obtained from 3‐(4′‐methylphenyl)sydnone in 70% yield. And the possible reaction mechanism is discussed.
Chalcones XI: Potential Germicides Derived from Acetyl Phenanthrenes and Acetophenones
Authors: Misra Shyam Sunder
Published: June 2015

Thirteen phenanthryl and biphenylyl chalcones have been synthesized in presence of saturated solution of Na in methanol to evaluate their germicidal activity against gram +ve and −ve bacteria.
The Reaction of N‐Oxide with Ethyl Bromoacetate
Authors: Tien Hsien‐Ju , Yeh Mou‐Yung , Tien Jack M.
Published: June 2015

The reaction of 4‐methoxypyridine 1‐oxide with ethyl bromoacetate was found to produce a high yield of ethyl glyoxylate, trimethylamine N‐oxide and pyridine 1‐oxide also afforded the glyoxylate but in lower yield in the reaction, and 4‐nitropyridine 1‐oxide was found to be inactive with bromoacetate. Pyridine 1‐oxide and trimethylamine N‐oxide exhibit the same stoichiometry, while 4‐methoxypyridine 1‐oxide follows a different course.
Correlation Between Polarographic Half‐Wave Potentials and Electronic Spectra of Cis‐Trans Complexes of Chromium (III) and Rhodium (III)
Authors: Wei Ho‐Hsiang , Li Ting‐Tung
Published: June 2015

A linear correlation between half‐wave potential (E1/2) for the process M(III)→M(II) and the first d‐d transition band (v) of the types cis and trans‐[M(en)2X2]n+ (M=Cr(III) and Rh(III), X=ONO−, NCS−, F−, Cl−, Br−, I−, H2O, DMF, DMSO, n=1, 3) was found. The plots of the difference in half‐wave potential (ΔE1/2) against the difference in the first d‐d transition hand (Δv) for the cis and trans isomer are straight lines. The equations, E1/2=β/nαF+K1 and ΔE1/2=(β/NαF)Δ were derived, and used to describe the linear correlations between polarographic behavior and electronic spectrum.
Phenoxy Derivatives of Dicyclopentadienyl Tungsten(VI) Oxydichloride and Bisindenyl Tungsten (VI) Oxydichloride
Authors: Rastogi M. K. , Multani R. K.
Published: June 2015

Phenoxy complexes containing π‐bonded cyclopentadienyl and indenyl groups attached to metals ytterbium1), titanium1), and cerium1). are reported in the literature. These phenoxide derivatives were prepared by the actious of various phenols on the cyclopentadienyl or indenyl metal halide complexes in benzene or tetrahydrofuran. There is no mention the literature about the prepartion and characterization of phenolic derivatives of π‐cyclopentadienyl and π‐indenyl oxotungsten (VI). The effect of electron releasing or electron attracting substiuents in the phenols on the nature of the complexes and the metal‐phenoxide bond has not been reported. The possibility of formation of hydrogen bond between hydrogen atom of the free hydroxyl group of a polyhydric phenoxide group and the oxygen atom attached to the metal atom has not also been explored. This communication deals with such an attempt and reports the synthesis and characterization of 26 phenoxy derivatives of dicyclopentadienyl and bisindenyltungsten (VI) oxydichlorides and conclusions derived from their infrared spectral study.
Studies on the Alkaloid of Formosan Lauraceous Plants XX Alkaloids of Lindera Oldhamii Hemsl. (3)
Authors: Lu Sheng‐Teh , Chen Ih‐Sheng
Published: June 2015

The structure of lindoldhamine (1), isolated from the leaves of Lindera oldhamii Hemsl., has been established as 1, by spectral data and chemical degradations.
Accumulation of Dieldrin, Heptachlor and DDT on Tea Leaves
Authors: Hsieh Bor‐Tsung , Huang Chin‐Wang
Published: June 2015

Tea leaves grown in a field that had been treated in the nearby top soil with 75% DDT 1kg per hectare, 50% Dieldrin 10kg per hectare, or 2.5% Heptachlor 50kg per hectare were analyzed separately. Dieldrin residues accumulated to a maximum of over 0.20ppm. DDT and both Heptachlor and its metabolite, Heptachlor Epoxide, were much lower than that of Dieldrin, with only a few samples detectable.
Studies on the Alkaloids of Illigera Luzonensis (Presl.) Merr
Authors: Liu Sian‐Ling
Published: June 2015

From the non‐phenolic base part of Illigera luzonensis (Presl.) Merr. launobine belonging to the aporphine type base was isolated.
Mössbauer Spectra of the Complexes of Iron(II) Bichloride with Monoacetyl and 1, 1′‐Diacetylferrocence Thiosemicarbazone
Authors: Wei Ho‐Hsiang , Horng Dang‐Ming
Published: June 2015

Complexes of iron(II) dichloride with monoacetyl and 1, 1′‐diacetylferrocence thiosemicarbazone have been prepared and characterized by means of optical spectra and magnetic measurement, and these structures have been investigated by Mössbauer spectra. It is inferred that the structures for iron(II) complexets of monoacetylferrocence thiosemicarbazone and 1, 1′‐diacetylbis (thiosemicarbazone) are monomer and polymer respectively.
Pressure Effect on the Interaction of Hydrogen Atoms with Ethyl Radicals
Authors: Lin Hau‐Hua , Yeh Chuin‐Tih
Published: June 2015

Hydrogen atoms from the mercury photosensitized decomposition of hydrogen was allowed to interact with ethylene. Product distributions of this interaction were analyzed with the FID‐gas‐chromatographic technique. Such distribution has been used to interprete, based on a proposed mechanism, the pressure effect on the following chemically activated process:

kP at 35°C has been determined to be 1.7×10‐7sec‐1 from this observed pressure effect.
The Chemical Constituents of the Wood of Keteleeria Davidiana Beissner
Authors: Cheng Y.S. , Lu S.B.
Published: June 2015

From the hexane and acetone extractive of the wood of Keteleeria davidiana Beissner, α‐pinene, β‐pinene, limonene, α‐copaene, bornyl acetate, β‐elemene, caryophyllene, caryophyllene oxide, α‐selinene, β∼selinene, selin‐11‐en‐4α‐o1, laevojunenol, α‐cyperone, stigmasterol, β‐sitosterol, tetracosyltetracosanoate, docosanyl tetracosanoate, hexacosanyltetracosanoate, tetracosanol, hexacosanol, docosanol, α‐conidendrin and 15‐hydroxydehydroabietic acid were isolated. Straight chain saturated hydrocarbons (C13, C14, C17‐C14) were also obtained.
The Chemical Constituents of the Wood of Pinus Luchuensis Mayer
Authors: Cheng Yu‐Shia , Shiue Gong‐Huey
Published: June 2015

From the hexane extractive of the wood of Pinus luchuensis Mayer, α‐pinene, β‐pinene, camphene, camphor, 4‐terpineol, α‐terpineol, carvacrol, tetracosanol, hexacosanol, octacosanol, β‐sitosterol, stigmasterol, methyl dehydroabietate, pinosylvin monomethylether, pimaric acid, dehydroabietic acid and straight chain hydrocarbons C23‐C35 were isolated.
Pseudo‐Halide Complexes of Biscyclopentadienyl Niobium(IV) and Bisindenyl Niobium(IV) Dichloride
Authors: Vij P. K. , Bhalla M. S. , Multani R. K.
Published: June 2015

Reactions of biscyclopentadienyl niobium(IV) dichloride and bisindenyl niobium(IV) dichloride with sodium or potassium salts of various pseudohalides have been studied and the pseudohalide complexes so formed of the formulae (C5H5)2Nb(Ps)2 and (C2H7)2Nb(Ps)2 where Ps may be NC, NCO, NCS, or N3, have been isolated. The complexes have been characterised on the basis of physical measurements, analytical data and infrared spectral studies.
The Resolution of RS‐Mandelic Acid
Authors: Wong Chi‐Huey
Published: June 2015

Racemic mandelic acid was resolved through R(‐)‐mandelic acid salt with L‐phenylalanine methyl ester in ethanol; the antipode S(+)‐mandelic acid was then recovered from the mother liquid. Both were prepared in high yield and in highly optical purity.

Carboxypeptidase A was also used in the separation of S(+)‐mandelic acid via selective hydrolysis of hippuryl‐RS‐mandelic acid. Comparison of the two methods was discussed.
Two New Sesquiterpenes 3β‐Hydroxycedrol and Widdringtonia Acid II‐A Co‐Crystal of β‐Chamigrenic Acid and Hinokiic Acid
Authors: Kuo Yueh‐Hsiung , Lin Yau‐Tang
Published: June 2015

Widdringtonia acid II, a common acidic constituent in Juniperus and Widdringtonia species, and 3β‐hydroxycedrol were isolated from juniperus squamata Lamb. Widdringtonia acid II was proved to be crystals derived from the 1:1 mixture of β‐chamigrenic acid and hinokiic acid. The structures of β‐chamigrenic acid and 3β‐hydroxycedrol were established by chemical and physical evidence. In addition three other crystalline compounds, 7‐oxototarol. hinokiol, and widdrol, were also identified.
Studies on Palladium (II) 2,4‐Dinitrosoresorcinol 6‐Sulphonate Complexes
Authors: Masoud Mamdouh S. , Ghonaim S. A.
Published: June 2015

The reaction between palladium (II) and 2, 4‐dinitrosoresorcinol 6‐sulphonate was studied. Two species with the mole ratio 1:1 and 1:2 were traced. Their stability constants were computed. Elemental analyses, spectral and the magnetic susceptibility measurements of the prepared 1:1 and 1:2 complexes suggested that these complexes are diamagnetic in square planer geometry, with nitrosophenol structure.
Two New Sesquiterpenes 3β‐Hydroxycedrol and Widdringtonia Acid II‐A Co‐Crystal of β‐Chamigrenic Acid and Hinokiic Acid
Authors: Kuo Yueh‐Hsiung , Lin Yau‐Tang
Published: June 2015

Widdringtonia acid II, a common acidic constituent in Juniperus and Widdringtonia species, and 3β‐hydroxcedrol were isolated front Juniperus squamata Lamb. Widdringtonia acid II was proved to be crystals derived from the 1:1 mixture of β‐chamigrenic acid and hinokiic acid. The structures of β‐chamigrenic acid and 3β‐hydroxycedrol were established by chemical and physical evidence. In addition three other crystalline compounds, 7‐oxototarol, hinokiol, and widdrol, were also identified.
Electrode Kinetics and Activation Energy of Uranyl‐Ferron Chelate by Polarography
Authors: Kao Chen‐Feng , Lai Tsai‐Teh
Published: June 2015

The uranyl chelate of ferron was investigated polarographically over the pH range 1.98–10.00 and ligand concentration 0.005–0.060.M. A reversible and diffusion controlled reduction wave was obtained, however, when ferron concentration below 0.02M and pH below 5.0, it became irreversible. The chelate species identified were UO2(HA) 2 at pH range 2.5–7.1 and UO2(OH) (A) 2−3 over pH 7.1. The electron‐transfer coefficient, rate constant, diffusion coefficient and activation energy of the reduction process were determined.
Synthesis Of N, N′‐Bis(8‐Quinolyl)‐Oligo‐Methylene‐Diamines from 8‐Aminoquinolines
Authors: Horng Y. S. , Hwang C. C. , Liao C. C. , Liu C. S. , Sheu C. F. , Yu Y. H.
Published: June 2015

Various N′,N‐bis(8‐quinolyl) trimethylenediamines 3a‐3e have been prepared from the corresponding 8‐aminoquinolines 1a‐1e by direct N‐alkylation with 1, 3‐dibromopropane in fair yield (25‐51%). N. N′‐bis(8‐quinolyl) ethylenediamines, 3f and 3g, and N,N′‐bis(8‐(6‐methoxyquinolyl) ]tetramethylenediamine. 3h, may only be synthesized in poor yield via the corresponding oxalamides and succinamide.
Thiocarboxylato Complexes of Biscyclopentadienyl and Bisindenyl Titanium (IV)
Authors: Arora R. S. , Hari S. C. , Bhalla M. S. , Multani R. K.
Published: June 2015

Reactions of biscyclopentadienyl (and bisindenyl) titanium (IV) dichlorides with sodium salts of various thiocarboxylic acids in tetrahydrofuran medium, yield the complexes of the general formula (D) 2Ti(SCOR) 2 where D is cyclopentadienyl or indenyl group and RH, CH3, C2H5, C4H5 or p‐C4H4CH3 group. The foul smelling complexes are monomeric in nature. The IR spectra, thermal stabilities and Some physical characteristics of these complexes have been studied.
Synthesis and Characterization of Oxybis(Diacetoxyborane) Derivatives of Bifunctional Tridentate Aldimines
Authors: Tripathi S. M. , Singh R. V. , Tandon J. P.
Published: June 2015

The reactions of oxybis(diacetoxyborane) with the aldimines, N‐(2‐hydroxyethyl) salicylaldimine N‐(2‐hydroxy‐1‐propyl) salicylaldimine, N‐(3‐hydroxy‐1‐propyl) salicylaldimine, N‐(o‐hydroxyphenyl) salicylaldimine. N‐(m‐hydroxyphenyl) salicylaldimine, N(2‐hydroxyethyl)‐2‐hydroxy‐1‐naphthaldimine and N(2‐hydroxy‐1‐propyl) 2‐hydroxy‐1‐naphthaldimine have been carried out in 1: 1 and 1: 2 molar ratios. All the compounds except those derived from N‐(3‐hydroxy‐1‐propyl) salicylaldimine have been found to be sparingly soluble in benzene and nonelectrolytes in anhydrous DMF. The newly synthesized derivatives have been characterized by elemental analysis, molecular weight determinations and infrared, proton magnetic resonance, ultraviolet, visible and 11B nuclear magnetic resonance spectral studies.
A New Process for the Synthesis of Fentanyl
Authors: Zee Sheng‐Hsu , Wang Wan‐Kung
Published: June 2015

Catalytic hydrogenation of pyridinium derivative for the preparation of analgesic Fentanyl, (N‐(l‐phenethyl‐4‐piperidyl)‐propionanilide) is reported. This constitutes a novel synthesis for the analogs of Fentanyl type compounds.
The Preparation and Structural Study of Nickel (II) Complexes of N,N′‐(8‐Quinolyl)Trimethylenediamines
Authors: Hwang C. C. , Yu Y. H. , Horng Y. S. , Liao C. C. , Liu C. S.
Published: June 2015

A number of Ni(II) complexes of N,N′‐bis(8‐quinolyl)trimethylenediamines are synthesized both as perchlorate salts and neutral amino complexes. Substitutions on the 2 and 6 positions of the quinolyl ligands are introduced for various reasons concerning the structural studies. The structural informations are obtained by studies of the magnetic properties, electronic spectra and NMR spectra. Structural changes effected by acid/base property of the medium are followed by NMR spectroscopy.
Laboratory Construction of Copper‐Selective Electrode
Authors: Chang Fu‐Chung
Published: June 2015

Copper ion selective electrode was constructed and the performance of membranes prepared from different methods was compared. Removal of oxygen from the system in the preparation of electrode membrane was suggested. The behavior of the membrane, the working concentration range, response time, internal filling solution and treatment of the electrode were discussed.
Synthetic Studies on Vitamin D3 Analogues: The Synthesis of 8‐P‐(Hydroxymethyl)‐Phenyl‐Des‐A, B‐Cholest‐8( 9) +8( 14)‐ENE
Authors: Chau Tay‐Yuan
Published: June 2015

The Grignard reagent derived from p‐bromobenzyltetrahydropyranyl ether on reaction with the des‐A, B‐cholestan‐8‐one yielded 8‐p‐(terahydropyran‐2′‐yloxymethyl)‐phenyl‐des‐A, B‐cholestan‐8‐ol which on treatment with H2SO4 to give 8‐p‐(hydroxymethyl)‐phenyl‐des‐A, B‐cholest‐8(9)+8(14)‐ene.
Stability of 2‐Carboxyphenylhydrazoethylacetoacetate Complexes of Rare‐Earth Elements in Dioxan‐Water Solution
Authors: Zahra Ahmed M. , El‐Shetary Basheir A. , Ismail A.
Published: June 2015

The results of pH‐metric titration have been used to determine the acid dissociation constants of 2‐carboxy‐pheylhydrazo‐ethylacetoacetate abbrivated (2‐CPHEA) and the overall stability constant (log β=KML, KML2) of twelve rare earth element complexes in 75% dioxan were calculated.
Gas Chromatographic Determination of Cinoxacin
Authors: Wu Hsin‐Lung , Lin Shun‐Jin , Hsü Chi‐Yao
Published: June 2015

A gas Chromatographic method has been established for analysis of Cinoxacin in crystalline powder. The method is based on chemicaI derivatization of Cinoxacin as its methyl ester, and n‐octacosane is used as an internal standard. Gas chromatographic analysis was proceeded on a glass column packed with 2% OV‐1 on Chromosorb W. Quantitation is feasible by measurements of peak area ratios. The method proves to be simple, rapid and accurate.
Solution Equilibria and Structures of the Interaction of Diglycollic Acid with Iron(III), Cobalt(II), Nickel(II) and Copper(II) Salts
Authors: Masoud Mamdouh S. , Elnaggar H.
Published: June 2015

The interaction of diglycollic acid ligand with iron(III), cobalt(II), nickel(II) and copper(II) salts was investigated potentiometrically and spectrophotometrically. Only 1:1 complexes were formed in solution and solid. The pK's of the ligand and its complexes were computed. The electronic absorption spectra of the complexes depict the octahedral geometry. The infra‐red spectra of the ligand and its complexes were discussed.
Determination of Isobutanol in Phosphoric Acid by Gas Chromatography
Authors: Kuo C. H. , Shih J. S. , Yeh Y. C. , Wu S. C.
Published: June 2015

Isobutanol in phosphoric acid was detected by gas chromatography with a flame ionization detector. Samples with high content (>100 μg/ml) of isobutanol were diluted with a n‐pentanol aqueous solution and the diluted solutions were directly injected into the GC column for the determination of isobutanol. For lower content samples, isobutanol was preconcentrated by vacuum distillation or CCl4 extraction followed by activated alumina adsorption. In whole GC measurements, n‐pentanol was used as an internal standard.

The flame ionization detector is capable of detecting quantities of isobutanol as small as 5×10−8g. With preconcentration, isobutanol at the concentration of 0.4 μg/ml or lower can be determined.
Spectrophotometric and Polarographic Studies on 9,10‐Anthradione‐2‐Sodium Sulfonate
Authors: El‐Maraghy Salah B. , Ebied M. F. E. , El‐Wafa S.
Published: June 2015

The effect of solvent structure on the rates of redox reactions in alcohol+water mixture was discussed by some authors. The rate of photoreduction of 9,10‐anthraquinone‐2‐sulfonate was decreased by addition of H2SO4 but was unchanged by increase of ionic strengh with (NH4)2SO4. The magnitude of the decrease in presence of acid was greater with ethanol or isopropanol than with N‐ethylacetamide as substrate. The formation of semiquinone and carbonate radical anions was observed(4) during the direct photoreaction. The electron transfer from the carbonate anion to sulfoanthraquinone in the first excited triplet state was the controlling step of this process. Therefore, anthraquinone β‐sodium sulfonate is efficient sensitizers of the photooxidation of organic substrates in aqueous media.
An Investigation of the Effect of Air‐Oxidation on Coal Liquefaction
Authors: Chang Ching‐Yuan , Guin James A. , Tarrer Arthur R.
Published: June 2015

Experiments are performed to investigate the effects of oxidation upon coal liquefaction in a combined pre‐oxidation‐liquefaction process. It is found that the air‐oxidation of coal preceding liquefaction is generally detrimental to liquefaction yields for both cases with or without presence of hydrogen gas in the dissolution step, and could be highly harmful to the processes which rely solely upon hydrogen donor solvents such as 1,2,3,4‐tetrahydronaphthalene. The analyses of oxidized and unoxidized coals show a significant decrease in hydrogen but increase in oxygen contents of the coal with oxidation. These factors together with the possible formation of oxygen‐coal bonds and the increase in —OH and/or —COOH groups in the oxidized coal are thought to account for the decreasing conversion of oxidized coal when it is subjected to liquefaction.
Dioxouranium (II) Chelates with Nitrogen Donor Ligands
Authors: Mathur R. P. , Sharma K. G. , Mehta R. K.
Published: June 2015

The chelates formed by the reaction of dioxouranium (II) with (α‐benzoylmethyl‐benzylideneimino)benzene sulphonic acid (H2BB), (α‐benzoylmethyl‐benzylideneimino) ethane sulphonic acid (H2BE), 3‐(α‐benzomethyl‐benzylideneimino) propanoic acid (H2BPA) & 0‐(α‐benzoylmethyl‐benzylideneimino) benzoic acid (H2BBA) have been prepared and studied potentiometrically using Calvin's extension of Bjerrum's method in aqueous medium at different ionic strengths (0.01, 0.05 and 0.1 M NaClO4) at 25°, 35° and 45°. The thermodynamic parameters for all the chelates have been evaluated. These compounds have also been isolated as crystalline solids and are characterised by analytical data, electrical conductance, magnetic moment and IR studies.
A NMR Study of Magnetic Nonequivalence of Methylene Protons in Some 1,1,2‐Trisubstituted Ethanes of the Type XCH2 CHXY
Authors: Lin Shin , Lin Wei‐Chuwan
Published: June 2015

Magnetic nonequivalence of methylene protons in some 1,1,2‐trisubstituted ethanes of the type XCH2 CHXY was studied in the medium of various solvents over the temperature range of 0–95°C. Asymmetry effect and rotamer populations have been considered to be two major contributions to magnetic nonequivalence of methylene protons in the title compounds. A graphic method has been proposed to determine the asymmetry effect for methyl 2,3‐dibromopropionate, ethyl 2,3‐dibromopropionate, methyl 2,3‐dichloropropionate, and (1,2‐dibromoethyl) benzene in various solvents.
Chemical Phosphorylation of Nucleosomes and Histone H4
Authors: Lin Yuan‐Chuan , Smith Roberts A.
Published: June 2015

Using N,N′‐Dicyclohexylcarbodiimide (DCC) as a condensing agent, 32P‐cyanoethylphosphate and NH3 were combined to yield 32P‐cyanoethylphosphoramidate. Treatment with NaOH resulted in a β‐elimination step to yield 32P‐phosphoramidate and acrylonitrile. The phosphoramidate was purified via DEAE‐cellulose chromatography. At pH 7.4 the histidine residues of histone H4 were chemically phosphorylated using 32P‐phosphoramidate as the phosphoryl donor. The nucleophilic nitrogen of the imidazole ring is attracted to the phosphorus of phosphoramidate resulting in the displacement of NH3 and formation of the protein phosphoryl‐nitrogen linkages.

Chromatin monomers (nucleosomes) were prepared by a mild digestion of chromatin with micrococcal nuclease. This report also presents the chemical phosphorylation of these nucleosomes by 32P‐phosphoramidate.
Spectrographic Determination of Common Impurity Elements in High‐Purity Lanthanum Oxide
Authors: Yeh Kigh‐Shone , Chang Fu‐Chung , Yeh Yu‐Chai , Wu Shaw‐Chii
Published: June 2015

An emission spectrographic method for the quantitative determination of 17 trace elements in high‐purity lanthanum oxide has been developed. The sample was ignited in muffle furnace at 850° for one hour to remove the moisture and carbon dioxide, then blended with equal amount of graphite and 10 mgs of this mixture was taken into electrodes. A 10 amps dc are was employed to excite the mixture and a 3.4 meter Ebert Spectrograph with 15,000 LPI plane grating was used to record the spectrum in the region 2,200 at 3,400 Å. The weak line of lanthanum was used as an internal standard. The working ranges of these elements were: Ag, Mg 0.5 to 50 ppm; Be 0.5 to 100 ppm; V, Cr 1 to 100 ppm; Cu, Sn, Fe 3 to 100 ppm; Ge, Mn, Ni 5 to 100 ppm; B, Co, Pb, Sb 10 to 100 ppm; Ca and Si 30 to 500 ppm. The precisions fell in the range of 10 to 24%.

Samples obtained from Engineering Research Laboratory (ERL) of Institute of Nuclear Energy Research were also examined.
Kinetic Study of the Bromine‐Catalyzed Isomerization of Maleic Acid in Aqueous Ce(IV)‐Br−‐H2SO4 Medium
Authors: Jwo Jing‐Jer , Chen Yih‐Hsiung
Published: June 2015

The presence of ceric and bromide ions catalyzes the isomerization of maleic acid (MA) to fumaric acid (FA) in aqueous sulfuric acid. A kinetic study of this bromine‐catalyzed reaction was carried out. The reaction between ceric ion and maleic acid is first order with respect to Ce(IV). For [Ce(IV)]0=5.0×10−4 M, [H2SO4]0=1.2 M, μ=2.0 M (adjusted by NaClO4), and [MA]0=(0.5–1.0)M, the observed pseudo‐first‐order rate constant (k03) at 25° is k03=7.622×10−5 [MA]0/(1+0.205[MA]0). The reaction between ceric and bromide ions is first order with respect to Ce(IV). For [Ce(IV)]0=5.0×10−4 M, [H2SO4]0=1.2 M, μ=2.0 M, and [Br−]0=(0.025–0.150)M, the pseudo‐first‐order rate constant (k02) at 25° is k02= (4.313±0.095)x10−2[Br−]2+(2.060±0.119)x10−3[Br−]. The reaction of Ce(IV) with maleic acid and bromide ion is also first order with respect to Ce(IV). For [Ce(IV)]0=5.0×10−4 M, [MA]0=0.75 M, [H2SO4]0=1.2 M, μ=2.0 M, and [Br−]0= (0.025–0.150)M, the pseudo‐first‐order rate constant (k03) at 25° is k03= (5.286±0.045)x10−2[Br−]2+(3.568±0.056)x10−3[Br−]. For [Ce(IV)]0=5.0 × 10−4 M, [Br−]0=0.050 M, [H2SO4]0=1.2 M, μ=2.0 M, and [MA]0=(0.15–1.0)M at 25°, k03=(2.108×10−4+2.127×10−4[MA]0)/(1+0.205[MA]0). A mechanism is proposed to rationalize the results. The effect of temperature on the reaction rate was also studied. The energy barrier of Ce(IV)—Br− reaction is much less than that of Ce(IV)—MA reaction. Maleic and fumaric acids have very different mass spectra. The mass spectrum of fumaric acid exhibits a strong metastable peak at m/e 66.5.
Spectrophotometric Determination of Zirconium in Monazite Sand
Authors: Lee Chi‐So , Chang Fu‐Chung , Yeh Yu‐Chai
Published: June 2015

A sensitive spectrophotometric method was developed for the determination of zirconium in monazite sand. The zirconium ion was previously separated from the other interfering elements by a 0.5 M thenoyltrifluoroacetone (TTA)‐xylene extraction, then determined with Arsenazo III in 9 M HCl medium. Zirconium reacted with Arsenazo III to form an emeraled green coloured complex having maximum absorbance at 665 nm in 9 M HCl medium. The color was stable for at least 2 hours. Effects of time, HCl concentration, gelatine and various ions have been studied. The system confirms the Beer's law over the concentration range investigated. Optimum condition range for measurement in 1.0 cm quartz cell is 0.1–0.5 μg/ml of zirconium. The molar absorptivity is 1.51×105 liter mole−1 cm−1. The metal‐ligand ratio of 1:4 was confirmed by Job's Continuous Variation method and the conditional stability constant of Zirconium‐Arsenazo III Complex in 4 M HCl and 9 M HCl were also determined by this method.
Bromination of 5,7,4′‐Trimethoxyflavanone
Authors: Ueng Tsong , Chen Fa‐Ching
Published: June 2015

Three new 8‐bromoflavonoids, 3,3,8‐tribromo‐5,7,4′‐trimethoxyflavanone (5), 3,8‐dibromo‐5,7,4′‐trimethoxyflavanone (7) and 3,8‐dibromo‐5,7,4′‐trimethoxyflavone (6); and two known 8‐bromoflavones, 8‐bromo‐5,7,4‐trimethoxyflavone (8) and 8‐bromo‐5‐hydroxy‐7,4′‐dimethoxyflavone (9), have been isolated on bromination of 5,7,4′‐trimethoxyflavanone (4).
Kinetics of the Decarboxylation of Gallic Acid in Pyrogallol, Resorcinol and Catechol
Authors: Haleem M.A. , Farrouq K. , Hakeem M.A.
Published: June 2015

Kinetic data are reported for the decarboxylation of gallic acid in pyrogallol, resorcinol and catechol. This is the first study of its kind in these solvents. The reaction is first order and non‐stoichiometric.
Iodide Ion‐Selective Electrode and Its Application to the Determination of Organic Compounds
Authors: Chang Fu‐Chung , Chang Wen‐Lin
Published: June 2015

The mixture of silver iodide and ferrocene is used to prepare the membrane of iodide ion‐selective electrode. The interference of sulfide can be reduced by the addition of cupric ion in the test solution. Ethylene glycol is determined by potentiometric titration using iodine ion‐selective electrode as an indicator electrode.
Spectrophotometric Determination of Cobalt, Nickel and Palladium after Extraction with Thioxanthate into Molten Naphthalene
Authors: Puri B. K. , Sethi C. L. , Kumar Ashok
Published: June 2015

Cobalt, nickel and palladium have been extracted with thioxanthate into molten naphthalene (85–90°C). Various parameters involved in the extraction have been studied and composition of the extracted complex established in each case. Cobalt. nickel and palladium thioxanthates are extracted in the pH range, Co: 5.0–9.5. Ni: 3.9–7.4 and Pd: 2.0–9.5 and can be determined spectrophotometrically at 390. 500 and 345 nm respectively. The molar absorptivities are calculated to be Co: 6.187×103 ℓ mol−1 cm−1, Ni: 8.8×103 ℓ mol−1 cm−1 and Pd: 1.16×104 ℓ mol−1 cm−1 with sensitivities in terms of Sandell's defication are; 0.0095 μg Co/cm2 at 390 nm, 0.0060 μg Ni/cm2 at 500 nm and 0.0091 μg Pd/cm2 at 345 nm respectively. These conditions have been utilized for the determination of these metals in alloys and also for the simultaneous determination of cobalt and nickel in an alloy.