bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of Micro Amounts of Lead by the “Isotope Dilution Method of Analysis” with ThB (Pb212) as a Tracer
Authors: Chen Ying‐Mao
Published: June 2015

Determination of micro amounts of lead with ThB (Pb212) as a tracer by the “Isotope Dilution Method of Analysis” has been studied.

ThB can be easily obtained from ordinarly chemical reagent of thorium nitrate by extracting with dithizone. If dithizone in chloroform solution is saturated with lead containing radioactive tracer ThB, and equilibrium is established with the aqueous layer containing varying amounts of lead, the amounts of lead in the aqueous solution can be easily found by simply measuring the activities in the organic layer from the following relation:

With this relation, the determination of micro amounts of lead in aqueous solutions can be easily made without any auxiliarly chemical methods.
Study of the Essential Oil of Wild Perilla and the Stereospecific Reduction of (−)‐Piperitone
Authors: Yeh Ping‐Hsien
Published: June 2015

The essential oil from wild perilla contains 55% (−)‐piperitone, 31% (−)‐limonene, 6% α‐caryophyllene, and 0.5% (−)‐piperityl formate. 2,4‐Dinitrophenylhydrazone was found to be the most suitable derivative for the identification of piperitone. Partial racemization, that occurred during the formation of the semicarbazone and also during the hydrolysis of the semicarbazone, was confirmed by the isolation of a new optically active semicarbazone of (−)‐piperitone. Reduction of (−)‐piperitone with sodium and moist ether gave (+)‐isomenthol in high yield. This will find application in stereospecific synthesis.
Study in the Nature of Silicon in Rice Hull. I. Solubility of the Silicon Part
Authors: Liu Sheng‐Lieh , Ho Chin‐Hsia
Published: June 2015

Believing that the silicon in rice hull must exist as organosilicon compounds, the authors have undertaken a series of researches so as to gain an insight into the problem. In this paper, experiments including treatment with hydrofluoric acid, extraction with various solvents, hydrolysis with acid and boiling with alkali are described. Dialysis of the products resulting from these experiments has shown definitely that silicon passed into aqueous solution even with a pH at which silica might precipitate. Since lignin does not contain ash, it is supposed that the silicon in rice hull may be combined with the polysaccharide part.
Studies of the Solution Polymerization of Vinyl Acetate in the Aqueous Solution of Partially Acetylated Polyvinyl Alcohol. III. The Configurational Change of the Polymer
Authors: Lin Chen‐Chong
Published: June 2015

The configurational change of the specially prepared graft polymer molecule occurred, when an appropriate amount of alcohol was added into the polymer solution and then evaporated it again. The graft polymer studied here was polyvinyl alcohol (PVA) with polyvinyl acetate (PVAc) branching prepared according to the procedure given in our previous papers.(1.2)

The schematical explanatian of the configurational change of this graft polymer has been given. The viscosimetric measurements of the solution of the polymer of outward form have been examined and the results compared with those of the solution of the polymer of inward form. The polymer of outward form dissolved in alcohol of various strengths have their values of intrinsic viscosity the same as, but their values of Huggins' constant different from, those given by the polymer of inward form.

The extent of configurational change of the polymer molecule depends on the amount of alcohol added in bringing about the change.
Cathodic Action of the Uranium Chelate Compounds at the Dropping Mercury Electrode. II. Uranyl‐Glutamate Complex
Authors: Lai Tsai‐Teh , Chang Teh‐Liang , Chang Hua
Published: June 2015

The polarographic behavior of a tridentate chelate compound of uranyl‐glutamate has been investigated over the pH range of 1.5 to 5.5.

The first wave of one‐electron reduction and diffusion‐controlled reversible wave was applied through this pH. range. Below pH 1.9 there was no chelation, and above pH 5.5 turbidity ensued.

At pH 3.0 to 3.9 the diffusion current was independent of pH value and the diffusion current constant was calculated to be 2.08. The proportionality between uranyl ion concentration and diffusion current held within the narrow range of 2.2 × 10−4 M to 3.3×10−3 M with 1.9% average deviation of the mean.

The chelate forms and electrode reactions identified from the half‐wave potential and diffusion current data were:
Polarographic Studies of Dipicrylamine. III. Coulometric Determination of n, Number of Electrons Involved in the Reduction of Dipicrylaminate Ion on the Dropping Mercury Electrode
Authors: Lin Zui‐Feng
Published: June 2015

Coulometric study was carried out according to Lingane to determine the number of electrons involved in the reduction of dipicrylaminate ion on the dropping mercury elctrode. Among the three waves shown in the previous paper, the second wave is most well defined. Therefore, n, number of electrons involved at this step was determined. From the n value determined in the present investigation, the mechanism of reduction of dipicrylaminate ion on the dropping mercury electrode was given. The polarographic diffusion coefficient was evaluated from n and diffusion current constant by using Ilkovic equation.
Study of the Extractive Constituents from the Wood of Libocedrus Formosana, Fllorin. IV. Partial Hydrogenation of Thujic Acid
Authors: Cheng Yu‐Shia , Lo Tung‐Bin , Chang Luan‐Ho , Lin Yau‐Tang
Published: June 2015

Further studies of partial hydrogenation of thujic acid by Na‐Hg was made. Acid (I) was obtained by using the boric acid buffered water medium. It was quantitatively isomerized to acid (IV) by the treatment with a weak base. Acid (I) and (IV) were identified as 4,4‐dimethylcyclohepta‐2,6‐diene‐carboxylic acid and 4,4‐dimethylcyclohepta‐1, 6‐diene‐carboxylic acid respectively.
Ultraviolet Absorption of the Flavone Series. VI. Spectra of Some Biflavonyls
Authors: Lin C. H. , Hsu K. K. , Chen F. C.
Published: June 2015

Absorption spectra of seven biflavonyls were investigated. They were compared with those of the structurally related hydroxy‐flavones and haloflavones. Such spectrographical data, as well as the considerations of the electron density distribution and of the steric hindrance led to the establishment of the configurations of the biflavonyls in question.
Studies of the Solution Polymerization of Vinyl Acetate in the Aqueous Solution of Partially Acetylated Polyvinyl Alcohol. IV. The Interfacial Properties of the Graft Polymer
Authors: Lin Chen‐Chong
Published: June 2015

The interfacial properties of the graft polymer, which consists of polyvinyl alcohol with polyvinyl acetate branchings prepared according to the procedure given in the previous papers, have been investigated. No significant difference between the inward and outward form of the graft polymer in interfacial tension has been observed, but remarkable differences in the ability of foming fine droplets and in the stability of the emulsion were found. This seems to‐be attributable to the existence of two configurational forms of the graft polymer of which the affinity with the oil phase are different from each other. It is conceivable that neither form of the graft polymers has a solubilization power for water insoluble substances. But the effect of substances slightly soluble in water on the viscosity of the polymer solution is dependent on the different configurational conditions of the polymer molecule in solution. This is considered to depend on the intra‐action of the polymer molecules, the interaction between the polymer molecules, and the medium into which the substances dissolve.
Polarographic Determination of Zirconium and Hafnium with EDTA
Authors: Pan Kuan , Sun Peng‐Joung , Wong Wen‐Kuei
Published: June 2015

Cadmium EDTA complexes in the acetate buffer has been used as an indicator electrolyte in the determination of zirconium and hafnium as EDTA complexes at pH 4.2. The polarographic determination of zirconium and hafnium could be made with solutions of concentrations as low as 10−6 molar or 0.1 p.p.m. The results were compared with those obtained by potentiometric titration of the free cadmium ion in the concentration range 10−3 to 10−4 molar using cadmium amalgam as an indicator electrode.
Solvent Extraction of Uranyl Thiocyanate Complex. I
Authors: Lai Tsai‐Teh , Lin Han‐Ton
Published: June 2015

The systematic study on the extraction behavior of uranyl thiocyanate with a mixture of isoamyl alcohol and ethyl acetate is described.

A uranium solution containing 1M to 3M of thiocyanate at pH range 1.0 to 3.0 was extracted quantitatively with a mixture of isoamyl alcohol and ethyl acetate (1:3). With a single extraction, the maximum amount of uranium passing into the organic solvent attained 96.5%.
Chelatometric Titration of Lanthanum with Gallein Indicator
Authors: Sun Peng‐Joung
Published: June 2015

A method using Gallein as indicator for the direct titration of lanthanum with disodium salt of EDTA was proposed. With this indicator, lanthanum ion can be titrated at the pH of 5.5 to 6.5, using hexamethylenetetramine as buffer.

At the end point, the violet color disappeared, giving rise to a red color. The interference of approximately equimolar concentration of various foreign ions was observed.

Rare earth metal may be titrated along with lanthanum under the same conditions, as shown by the presence of cerium ion.
Polarisability of Some Organic Liquids from Polarisation at Optical Frequency. II. Acetone Ether and Ethanol
Authors: Ke Jenn , Lin Jar‐Shyong , Lin Wei‐Chuwan
Published: June 2015

Refractive indices of the series of binary solution systems water acetone, acetone ethyl alcohol, ethyl alcohol ether and sodium perchlorate water were measured, and polarisabilities of the related organic liquids were determined on the basis os Böttcher's formula for refraction of mixture assuming the applicability of the additivity rule.
Determination of the Dissociation Constants of Rosolic Acid by Spectrography
Authors: Lin Tsong‐Hsing
Published: June 2015

Rosolic acid was found to exhibit an absorption maximum at 480 mμ which shifts toward longer wave‐lengths in alkaline solutions. Spectrophotometic observation on this absorption maximum was made, and the optical density vs pH curve was found to pass through a minimum at pH=5.98. By using Thamer and Vaigt's method, the author was able to evaluate the dissociation constants of rosolic acid.
Determination of Vanadium by the Extraction of Vanadium(III) Thiocyanate with Methyl Ethyl Ketone
Authors: Lai Tsai‐Teh , Chen Shou‐Nan
Published: June 2015

The spectrophotometric study on the extraction behavior of V(III) thiocyanate complex, with methyl ethyl ketone is described.

The greenish yellow color extract shows a absorbance maximum at 395 mμ in 1.0 to 2.8 N HCl solution, and the molar absorbancy index of the extract is 4,313. Beer's Law is valid over a range from 0.01 mg to 0.1 mg of vanadium.

The optimum concentration of SnCl2 for the reduction of vanadate was found at the range between 0.2 N and 0.4 N.

The minimum variation of the volume of organic solvent layer and aqueous layer after equilibration was found when the solution was 1.8 to 2.4 N in HCl, 0.35 to 0.65 N in SnCl2 and 0.9 to 1.2 M in NH4CNS.
Chelatometric Titration of Cobalt and Nickel with Gallein as Indicator
Authors: Sun Peng‐Joung , Chou Fa‐Chun , Yeh Cha‐Pying
Published: June 2015

In continuation of a series of chelatometric titration of metal ion with gallein indicator, two procedures for the EDTA titration of cobalt and nickel using gallein as indicator were proposed. In one procedure cobalt ion was titrated with standard 0.05 M EDTA solution in ammonium chloride buffer by stepwise addition of ammonia to keep the pH at the optimum value of 8. A sharp color change from violet to rose red indicating the end point can be observed. In another procedure nickel ion was titrated with standard 0.05 M EDTA solution at pH 8 to 9 in ammonia‐ammonium chloride buffer solution. The end point is indicated by a color change from bluish violet to rose red.

The interference caused by the presence of approximately equal molar concentration of various foreign ions was observed.
Mannich Bases Derived from 3‐Pipecoline, 4‐Pipecoline and 2, 6‐Dimethylmorpholine
Authors: Sun Frank Cheng
Published: June 2015

3‐Methylpiperidine, 4‐methylpiperidine, and 2, 6‐dimethylmorpholine were used to condense separately with sixteen different ketones and paraformaldehyde to yield various Mannich bases. All the hydrochlorides of Mannich bases prepared in this work were tested for their solubilities in water, in 0.1N hydrochloric acid and in 0.1N sodium hydroxide.
Synergistic Effect in the Solvent Extraction of Thorium
Authors: Yeh Si‐Jung , Chu Po‐Chen
Published: June 2015

By using Th‐234 as tracer, the synergistic effects in the extraction of thorium from aqueous solutions with mixtures of organic solvents were investigated for the system Th4+/β‐diketones/TBP/diluents. Four β‐diketones, i. e., acetylacetone, benzoylacetone, dibenzoylmethane and trifluoroacetone, were used. Synergistic enhancements on the distribution ratios were observed in all cases except when acetylacetone was used as the chelating agent at the pH range of 2–3. Based on the experimental observations, a plausible mechanism for the synergistic effect has been suggested. The effect of diluent is also dicussed.
Infrared Absorption Spectra of Halogenoflavonoids. II. 7‐Halogenoflavonoids
Authors: Lin Chi‐Hsiung , Su Jen‐Tsu , Chen Fa‐Ching
Published: June 2015

Infrared absorption spectra of seventeen 7‐halogenoflavonoids in KBr disks are observed with an Infracord Spectrophotomter. Absorption bands in the regions 3,500–1,400 cm−1 and 1,000–650 cm−1 are discussed.
Cathodic Action of the Metal Complexes at the Dropping Mercury Electrode. XI. Uranyl‐Antipyrine Complex
Authors: Lai Tsai‐Teh , Lin Han‐Ton
Published: June 2015

The polarography of uranium in antipyrine solutions was studied in detail. A reversible and diffusion controlled wave was obtained over pH 1.5 to 4.7 and antipyrine concentration ranging from 0.016 M to 0.631 M. At pH between 2.3 and 4.7, the half‐wave potential wasindependent of pH value. At pH lower one hydrogen than 2.3, ion was involved in the reduction. The U(VI)‐antipyrine compound was found to be a chelate species of UO2A2+2 and UO2A2+2 in antipyrine of concentratration lower than 0.155 M and at pH 3.5, but was a simple complex species of UO2AG+2 in antipyrine of concentration higher than 0.155 M. The value of ia/C is constant at 2.7 and 3.2 for pH value 2.0 and 3.5 respectively, over a 4.4 × 10−4 M to 5.5 × l0−3 M range of uranium concentration.
Polyamide Thin‐Layer Chromatography. III. A Modified Method of Preparation of Thin‐Layer and its Application to some Naturally Occurring Phenolic Substances
Authors: Wang Kung‐Tsung , Lin Yau‐Tang
Published: June 2015

Some modifications on the preparation of thin‐layer were made. By using the modified thin layer, the time required for development was shortened to one to two hours. Temperature and humidity effects for the thin‐layer formation are discussed. Small plates with the dimension 5×5 cm were prepared for horizontal development for preliminary solvent and color tests.

The crude extractives of leaves of six plants, comprising Evodia glauca Miq., Glycosmis cochinchinensis Pier, Clausena lumulata Hayata, Atalantia buxifolia Oliver, Pittosporum formosanum Hayata, and Murraya paniculata Jack., were investigated by polyamide thin‐layer chromatography. It was observed that the crude extractives gave satisfactory chromatogram.
Spectrophotometric Studies of Dioxo‐Complexes of Quadrivalent Metals. II. Thorium Chelate of Pyrogallolsulfonephthalein
Authors: Pan Kuan , Lin Zui‐Feng , Wu Yu‐Lin
Published: June 2015

Pyrogallolsulfonephthalein (abbreviated to PR) and its thorium chelate was spectrophotometrically studied in perchloric acid and perchlorate solution at various pH's. PR shows an absorption maximum at 478 mμ. at pH 3.0, which in the presence of thorium (IV) ion shifts to 544 mμ. The optimum pH for the formation of the chelate was found to be 2.7 to 3.2 and the mole ratio of Th(IV) to PR was 1:1. The instability constant was found to be 1.40×10−16 at ionic strength, μ=0.01.
Sorption of Radiocesium by Soil
Authors: Cheng Hwa‐Sheng , Hamaguchi Hiroshi
Published: June 2015

The sorption of radiocesium (Cs‐134) by seven different samples of soil has been studied over a wide pH range (0–14). In general, the sorption is excellent except in the low pH region. The presence of 0.01 N Na +, Mg++, Ca++, Sr++, Ba++ and Al+++ does not seem to influence either the uptake of radiocesium by, or the extraction of the sorbed radiocesium from, Red soil and Yellow soil.
Enrichment of Cobalt‐60 Activity by Szilard‐Chalmers Process
Authors: Yinand Moon‐Lung , Lee Tung‐Ching
Published: June 2015

In order to investigate the feasibility of producing enriched Co‐69 activity by Szilard‐Chalmers process, the complexes tris‐[1‐nitroso‐2‐naphthol] Co(III) (A), tris‐ethylenediamine Co(III) chloride (B) and potassium cobalticyanide (C) have been prepared and used for investigation. The percentage activity yield and enrichment factor for each complex have been estimated. The observed highest values of enrichment factor for the complexes (A), (B) and (C) were 287, 18.8 and larger than 3,300 respectively.
LCAO‐MO Energy Levels of Open‐Chain Hexaatomic π‐Orbital Systems with One Heteroatom
Authors: Lin Chi‐Hsiung
Published: June 2015

Fourteen open‐chain hexaatomic π‐orbital systems with one heteroatom are treated with the Hückel theory. From solutions of the secular equations, the dependence of π‐orbital energy levels on the heteroatom's Coulomb integral is studied. Applications to π‐bond energies, activation energies, and ultraviolet absorption maxima are discussed.
Synthesis and Properties of Polycholesteroxy‐Silanes
Authors: Liu Sheng‐Lieh , Wang Tai‐Tzer , Lin Hung‐Leo
Published: June 2015

Di‐, tri‐ and tetracholesteroxysilane have been Synthesized, and some of their properties reported.
Infrared Absorption Spectra of Haloflavonoids. V. 3′‐Haloflavonoids
Authors: Lin Chi‐Hsiung , Lin Li‐Chih , Chen Fa‐Ching
Published: June 2015

Infrared absorption spectra of eleven 3′‐haloflavonoids in KBr disks have been observed with an Infracord Spectrophotometer. Absorption bands in the region 3, 500–650 cm−1 are discussed.
Activation Analysis of Trace Impurities in Aluminum
Authors: Ke Chiung‐Huei , Cheng Hwa‐Sheng
Published: June 2015

Trace impurities in aluminum were determined. Manganese, nickel, copper, cobalt and iron were analyzed by the metod of activation analysis at the THOR, while sodium and potassium were determined by flame photometry. The results were: Mn 0.00066%, Ni 0.00041%, Cu 0.00060%, Co 0.00010%, Fe 0.12% and Na 0.0048%. K was not detected by flame photometry.
A Study of the Extractive Constiuents from the Wood of Libocedrus Formosana, Florin. VIII The Phenolic Components. Shonanol, a New Diterpene Phenol
Authors: Lin Yau‐Tang , Liu Kwang‐Ting
Published: June 2015

Then‐hexance‐soluble phenolic part of L. formosana contains at least fourteen components in which carvacrol,o‐isopropyl phenol,m‐isopropyl phenol and phenol have been identified by polyamide thin‐layer chromatography. A new diterpene phenol, shonanol, was isolated and its most probable structure was assigned as VIII from spectral evidence. Hydrothymoquinone derivatives which are the major constituents of Libocedrus decurrens (Heyderia decurrens) have not been found in L. formosana.
Enrichment of Chromium‐51 by Szilard‐Chalmers Process. II
Authors: Yeh Si‐Jung , Tsai Chung‐Hsiung
Published: June 2015

Enrichment of chromium was studied by means of Szilard Chalmers process. Potassium chromate was used as the target material. The ruptured chromium was separated from the target by three different methods which gave different enrichment factors in the range of 650–1400.

A systematic study was made to investigate the relationship be tween irradiation time and enrichment factor. It was found that the enrichment factor decreases with the increase in irradiation time. The effect of cooling time on the enrichment factor was also studied.
Comparison of Some Steroxysilanes
Authors: Liu Sheng‐Lieh , Lin Hung‐Leo
Published: June 2015

Four Stigmasteroxysilanes were synthseized. By comparing their properties with those of cholesteroxysilanes previously reported, it was found that no parallelism holds between the melting point curves of these two series of steroxysilanes. Infrared absorption at 900–910 cm−1 was proved to be characteristic of the Si‐O‐C bond between steroid and silicon atom. Tristigmasteroxytrimethylcyclotrisiloxane is for the first time reported.
Polyamide Layer Chromatography. VIII. Preparation of Polyamide Layer on Poly(ethylene terephthalate) Film and its Application to Aromatic Nitro Compounds
Authors: Wang Kung‐Tsung , Wang Iris S.Y. , Lin Alice L.
Published: June 2015

Poly(ethylene terephthalate) film was used as supporter for preparation of polyamide layer. The most convenient method of preparation was described. This layer can be cut into any size and its sensitivity is higher than the glass plate supported layer. Twenty aromatic nitro compounds were used to show the behavior of polyester film based polyamide layer.
NMR Studies on the Effect of Solvents on the Dimerization of Benzoic Acid
Authors: Tsay Shyr‐Jin , Lin Wei‐Chuwan
Published: June 2015

The chemical shifts of carboxyl proton in benzoic acid have been measured in a variety of solvents. The characteristic monomer and dimer chemical shifts have been evaluated at 23°. A detailed discussion is given to illustrate the solvent shifts of carboxyl proton, from which the dielectric constant of solvent is considered as the main factor.

The plot of carboxyl proton shift against (∈—1)/(∈+1) reveals a roughly linear dependence, indicating that a high field shift will be brought about by an increasing dielectric constant of solvent. Another linear relationship between log (δ—δD) and log ∈ suggests that an increase of ∈ will destroy the cyclic dimer, leading to an increase of the monomeric population and therefore to a higher field of the carboxyl proton signal.
Dissociation Constants and Chelate Stability Constants of Some Dihalogenated 8‐Hydroxyquinaldines
Authors: Chang Tiao‐Hsu
Published: June 2015

The acid dissociation constants of dihalogenated 8‐hydroxyquinaldines and the stability constants of their chelates with Zn[II], Ni[II], Co[II], Pb[II], Cd[II], Mn[II], and Mg[II] have been determined. The Calvin‐Bjerrum potentiometric titration technique was used in studying the behavior of these substances. The order of decreasing stability of the metal chelates Zn, Nc>Co>Pb>Cd>Mn>Mg is similar to the stability sequence generally obtained for divalent metals, and the order of decreasing stability of dihalogenated 8‐hydroxyquinaldines to form the metal chelates with metal ions is I>Br>Cl. Spot test reactions of dihalogenated 8‐hydroxyquinaldines and 8‐hydroxyquinolines with the metal ions also have been investigated.
Spectrophotometric Studies on Ferron and Thorium (IV)‐Ferron Chelate
Authors: Hseu Tong‐Ming , Chen Li‐Shu
Published: June 2015

The ionization constants of ferron (7‐iodo‐8‐hydroxyquinoline‐5‐sulphonic acid) and the interaction between Th(IV) and ferron have been studied spectrophotometrically at 25° and ionic strength of 0.1. The ionization constants were found to be pK1=2.41±0.01, pK2=7.10±0.01. The Th(IV)‐ferron chelate in aqueous solution of pH 5.0 exhibited a characteristic absorption maximum at 365 mμ. The composition of Th(IV)‐ferron chelate was 1:4 mole ratio of Th(IV) ion and ferron, and the stability constant (log Kg) was 26.22±0.16.
Syntheses of Some 2‐(3,4‐dihydro‐α‐pyranyl)‐methoxysilanes
Authors: Liu Sheng‐Lieh , Wei I‐Yuan
Published: June 2015

3,4‐Dihydro‐α‐pyran‐2‐methanol was treated with different chlorosilanes to give different Si‐O‐C compounds. Five new compounds, trimethyl[2‐(3,4‐dihydro‐α‐pyranyl)methoxy]silane, dimethylbis[2‐(3,4‐dihydro‐α‐pyranyl)methoxy]silane, methyltris[2‐(3,4‐dihydro‐α‐pyranyl) methoxy]silane, methyldipheny [2‐(3,4‐dihydro‐α‐pyranyl) methoxy]silane, and methylphenylbis[2‐(3,4‐dihydro‐α‐pyranyl)methoxy]silane are described.
Anomalous Nitration Reactions of Halotropones and Tribromotropolone
Authors: Lin Lung Ching , Yang Mo‐Tai
Published: June 2015

Nitration of 2‐bromo or 2‐chlorotropone gave a new compound, 2,7‐dinitrotropone: The halegen atom on the 2‐position was displaced by the nitro group through an electrophilic substitution reaction. Nitration of 3,5,7‐tribromotropolone gave 3,7‐dibromo‐5‐nitropolone: the nitro group again displaced the bromine atom at position 5.
Chemical Studies of Formosan Cobra (Naja Naja Atra) Venom: Part III. N‐Terminal Amino Acid Analysis of Some Purified Protein Components by DNP and DNS Methods
Authors: Lo Tung‐Bin , Chang Qui‐Linn
Published: June 2015

N‐Terminal amino acid residues of Fractions IX, X, and XII were reinvestigated by DNP and DNS methods with two‐dimensional polyamide thin‐layer chromatography. It was found that our previous work1 had been erroneously concluded. By the present work, it was obvious that all three fractions had Leu as their N‐terminal amino acid residues.
Supplementary Observations on the Chemistry of the Alkaloids of Berberine Series and Related Compounds I. Reexamination of Synthetic Reactions
Authors: Sebe Eigai , Ishigami Kichiji , Aizawa Tsutomu , Tsuchiua Shigeru
Published: June 2015

Syntheses of berberines, oxyberberines, and tetrahydroberberines were reported previously. In the present paper some new observations which have not hitherto been reported will be described.
Polarized Raman Spectra III. Some Important Sum Rules
Authors: Ting Chen‐Hanson
Published: June 2015

The sums involving Franck‐Condon overlap integrals are given in closed form for simple harmonic oscillator having the same potential field in both the ground state and the excited state. These sums are immediately related to the ones encountered in the theory of Raman scatterring.
Studies on the System Iron‐DTPA
Authors: Chu Shu‐Kung , Liu Sung‐Tsuen , Chen Shu‐May
Published: June 2015

The iron‐diethylenetriaminepentaacetic acid (DTPA) system has been investigated polarographically over the pH range 3–10 in the absence of maximum suppressor. The iron (III) complex is reversibly reduced at the dropping mercury electrode. Polarograms of mixtures of iron (III) and iron (II) yield a composite cathodic / anodic wave in the presence of excess DTPA. The half wave potential of the system is constant in the pH region 5.5–9, and from this the ratio of the stability of iron (III) DTPA to iron (II) DTPA has been evaluated. The stability constant of the ferric complex has been obtained from a spectrophotometric analyse of its dissociation equilibrium in 0.4–1.0 M perchloric acid medium at wavelength 380–520 mμ. μ dependence of the acid dissociation constant of DTPA verified that the Davies quation can be extended to μ = 1.0
Technetium‐99m Generator
Authors: Cheng Wen‐Pin , Yeh Si Jung
Published: June 2015

A systematic study was made to prepare technetium‐99m generator for domestic uses in the fields of nuclear medicine and biological tracer work by using molybdenum‐99 produced by Tsing Hua Open‐pool Reactor (THOR). Alumina was used as generator bed and technetium‐99m was milked by physiologic saline solution. It was found that it is feasible to prepare technetium‐99m generator by which medically acceptable technetium‐99m solution can be obtained for practical applications.
Labelling of Human Serum Albumin with Iodine‐131
Authors: Lo Jiunn Guang , Yeh Si Jung , Chen Teng Yueh
Published: June 2015

By using iodine‐131 prepared in the radioisotope laboratory of the National Tsing Hua University, a systematic study was carried out to prepare iodine‐131 labelled human serum albumin (RISA) for domestic use as a radiopharmaceutical. Special emphasis was placed on the purification of RISA in an attempt to meet the specifications required by medical workers. The optimum conditions for radioiodination reaction and purification procedure are discussed in details. It was concluded that the RISA prepared in the Tsing Hua Laboratory is acceptable for radiopharmaceutical use.
Polyamide Layer Chromatography XIV Aspect on Quantitative Analysis
Authors: Wang Kung‐Tsung , Wang Iris S.Y. , Yuan Sun‐Shin , Wu Po‐Hsiung
Published: June 2015

Ten common dinitrophenyl amino acids were used to test the performance of polyamide layer chromatography for quantitative analysis. The polyamide layer is used as the stationary phase and U. V. photometric method is employed for quantitative estimation. The results show that high accuracy of quantitative analysis by polyamide layer can be achieved. Possibility of repeated use of polyamide layer was discussed also.
Thermodynamics of Mercurous Acetate from E M. F. Measurements
Authors: Chen Li‐Shu , Pan Kuan
Published: June 2015

Measurements of the e.m. f.'s of the cell, have been made over a temperature range from 15° to 40°C. The standard e.m.f. of the Hg/Hg2Ac2(s), Ac− electrode was given by E0=−0.8640+1.832×10×3T−21.84×10−7T2. The thermodynamic properties of the reaction, Hg2Ac2(s)+2Cl−=Hg2Cl2(s)+2Ac− and those for the formation of Hg2Ac2(s) at 25°C were Computed.
Reaction of Methyl Iodide‐Mercuric Iodide with Phenothiazines
Authors: Huang C. L. , Gupta R. K.
Published: June 2015

Reaction of phenothiazine with methyl iodide in the presence of mercuric iodide did not yield a product with a methyl group attached to the sulfur atom. Instead, a quaternary ammonium salt was obtained. This paper is intended to provide correct information with supporting evidence for this raction.
Huckel Molecular Orbitals in Homonuclear Diatomic Molecules — A Comment on the Extended Huckel Theory
Authors: Ting Chen‐Hanson
Published: June 2015

The extended Huckel theory suggesteted by Hoffmann can be further simplified by neglecting the differential overlap integrals. The results agree fair well with the SCF‐MO theory in the cases of B2, C2, N2, O2, and F2.
Stereochemistry of the Elimination of Norcamphor‐ and Apocamphor Tosylhydrazone with Methyllithium
Authors: Liu Kwang‐Ting , Shapiro Robert H.
Published: June 2015

Upon treatment with three equivalents of methyllithium in ether at room temperature exo‐3‐d‐norcamphor tosylhydrazone gave norbornene which retained 21% of the deuterium and exo‐3‐d‐apocamphor tosylhydrazone gave apobornylene which retained 50% of the deuterium based on nmr and mass spectral analysis. In both cases exo‐elimination is favored when the primary isotope effect is considered. The relatively low selectivity between exo‐and endo‐elimination as compared with that observed in solvolytic studies was tentatively rationalized by the carbarion character of the transition state leading to proton abstraction by the base.
Kinetics of Photosensitized Polymerization of Methyl Methacrylate with Benzoin
Authors: Chen Chih‐Tsung , Huang Wu‐Der
Published: June 2015

The kinetics of photosensitized polymerization of methyl methacrylate with benzoin was investigated. The rate of polymerization was proportional to the square root of the concentration of benzoin and the first power of the monomer. The equation Rp=K1 ([M]‐α1) ([B]0.5+α2) was proposed, and K1 α1 and α2 were evaluated as 0.999×10−4, 0.181 and 1.11×10−2, respectively. The rate of polymerization was also proportional to the square root of light intensity in accordance with the equation Rp=5.65×10−12 I0.5. Carbon tetrachloride and chloroform markedly decreased the average degree of polymerization. The chain transfer coefficients were evaluated as 2.44 × 10−3 and 1.90 × 10−3 for carbon tetrachloride and chloroform respectively.
Hydrogen Bonding Studies in Benzoic Acid by Nuclear Magnetic Resonance Spectroscopy
Authors: Moxon K. B. , Still R. H. , Swinbourne F. J.
Published: June 2015

The chemical shift of the carboxyl proton in benzoic acid has been measured in a variety of aromatic solvents. The results obtained have been compared with previous data reported in this field, and discussed in this context in terms of the possible variables affecting the chemical shift.
Prelminary Reports on Structural Study via Mercury‐Sensitized Photolysis and Gas Chromatography
Authors: Tsao June C. Y.
Published: June 2015

The combination of photolysis and gas‐liquid chromatography results in “fingerprints” which are much superior to the pyrolysis gas chromatography method for the identification of organic compounds.

With this photolysis‐GIC method, a number of methyl ethers, benzyl ethers, isopropyl ethers and tert‐butyl ethers were chromato‐graphically purified and photolytically decomposed by way of mercury sensitization.

The photolytic degration products were temperature programmed in a sensitive gas‐liquid chromatograph.

The “fingerprint” product peaks were calculated into retention indices, Δ I‐values and I‐values, and grouped into homologous peaks, common peaks and distinctive peaks.

Identification of parent structures is obtained by the correlation of retention indices in the above three groups of peaks.
Stability of Aflatoxin B1 in Aqueous Solutions
Authors: Wei Ru‐Dong , Lee Shiuh‐Sheng
Published: June 2015

Stability of aflatoxin B1 in aqueous solutions at different temperatures and pH values was studied by thin‐layer chromatography and fluorodensitometric measurements. The rate of deterioration was found to be increased with increasing temperature and also by changing pH from neutral to alkaline or acid. In acidic buffers the aflatoxin was converted to a new fluorescent product which has much lower Rf value than aflatoxin B1 itself when chromatographed on silica gel thin‐layer plates developed with chloroform‐methanol(99:l, v/v). The UV absorption spectrum of this decomposition product has been determined.
Photochemical Copolymerization of Styrene with Methyl Methacrylate
Authors: Chih Kuo , Ho Shih Yeng
Published: June 2015

The photochemical copolymerization of styrene with methyl methacrylate were investigated under various conditions. The reactivity ratio and the ϕ values were evaluated.
On the Alkaloids of Nelumbo Nucifera Gaertn. Studies on the Alkaloids of Loti Embryo
Authors: Yang Tsang‐Hsiung , Chen Chi‐Ming
Published: June 2015

A new tertiary tetrahydroisoquinoline alkaloid, methylcorypalline (V) and biscoclaurine base, neferine (II) were isolated from a Formosan lotus embryo (embryo of the seed of Nelumbo nucifera Gaertn.) (Nymphaeaceae), besides the earlier reported isoliensinine (I) and lotusine (IV).

Characterization of this new base, methylcorypalline (I), mp. 58–59° (n‐hexane), , by spectral data and direct comparison with synthetic sample prepared from vanillin have proved to be 6,7‐dimethoxy‐2‐methyl‐1,2,3,4‐tetrahydroisoquinoline (V).

Methylcorypalline (V) is the first instance occurring in nature having coronary dilator action.
Preparation of Iodine‐131 Labeled Hippuran by Exchange Method
Authors: Chen Ching‐Tan
Published: June 2015

I131−labeled Hippuran was prepared by isotopic exchange reaction between ortho‐iodohippuric acid and I131‐iodide. Special emphasis was placed on the separation of I131−labeled Hippuran and its analysis with respect to the radiochemical purity. It was found that the prepared I131‐labeled Hippuran meets the requirement as the radiopharmaceutical to be used for medical purpose.
Growing Oriented Organic Crystals in a Simple Zone Refiner
Authors: Ting Chen‐Hanson
Published: June 2015

An interesting habit of crystal growth of organic compounds in zone‐refiner 13 noticed. It is fully utilized to grow large single crystals in the zone‐refining tubes directly after zone‐melting process.
Assessment of a Radiochemical Method Using 14C‐Labeled N‐Ethylmaleimide as a Reagent for Sulfhydryl Determination with Assays on β‐Lactoglobulin and Insulin
Authors: Lai Tzen‐Son
Published: June 2015

A radiochemical method using 14C‐labeled N‐ethylmaleimide (NEM‐14C) as a reagent for sulfhydryl determination is reassessed and described in detail. The method is based on the activity of 14C‐labeled S‐succinyl‐L‐cysteine (III‐14C) recovered from the controlled hydrolysis of the NEM‐14C treated sulfhydryl‐containing peptide and the correlation between III‐14C and SH content established with glutathione. It is simple, accurate and highly sensitive and is not affected by disulfide group as indicated by experiments with insulin. Good result is obtained from tests with β‐lactoglobulin. It gives a value of 1.94 mole SH per mole protein, which is close to that generally accepted.
Spectrophotometric Studies on Imidazole Adducts of Cupper(II) Beta‐Diketone Chelates
Authors: Chen Jung‐Tso , Wang Sunc‐Mao
Published: June 2015

Spectrophotometric studies in the visible region have been made on chloroform solutions of CuL; [L: anions of hexafluoroacetylacetone (HFA), thenoyltrifluoroacetone (TTA), trifluoroacetylacetone (TFA) and acetylacetone (AA)J with imidazole. The acidity of CuL2 increases in the order: Cu(TFA)2 < Cu(TTA)2<Cu(HFA)2. Isolation of the adducts and the nature of the spectra is strong evidence for the formation of both 1:1 and 1:2 adducts in the chloroform solution. For Cu(AA)2‐Im, neither such a spectral evidence was observed, nor the 1:1 adduct was isolated. By successive addition of imidazole, the displacement reaction takes place, and finally Cu(Im)4 is formed.
A Spectrophotometric Study OE Zirconium Complexes of 4,5‐Dihydroxyfluorescein
Authors: Sun Peng‐Joung , Liu Chuen‐Ying
Published: June 2015

Zirconium (IV) ions form violet red complex with 4,5‐dihydroxyfluorescein in fairly strong mineral acid medium. The reagent has been successfully applied as a metal indicator in the direct EDTA titration of zirconium.

The complex formed by 4,5‐dihydroxyfluorescein and zirconium ions has been studied spectrophotometrically in 0.1M HCl solution. It is found that when an excess of metal ion is present, a violet red colored complex with metal‐ligand ratio of 1:1, (MR) is formed and when an excess of 4,5‐dihydroxyfluorescein is present a 1:2 complex (MR2) may be predominant. The 1:1 complex has maximum absorption at 510 mμ and the 1:2 complex has very low solubility and tends to precipitate out from the solution. Job's method, log‐ratio method and gravimetric method were used to establish the composition of complexes. The apparent stability constant of the 1:1 complex is found to be log Kh = 4.46 or Kh = 2.9×101 at pH 1.2.
Potentiometric Study of the Chelates of Al(III), Ce(IV) and Th(IV) with Alizarin Red S
Authors: Govil Pradip K. , Banerji Samir K.
Published: June 2015

The stepwise metal‐ligand stability constants of ARS chelates with Al3+, Ce1+ and Th4+ have been determined by using Bjerrum‐Calvin technique. Various computational methods were used to determine the stability constants. The thermodynamic stability constants were also calculated by determining the stepwise stability constants at various ionic strengths and then by extrapolating to zero ionic strength. The order of stability constants was found to be: Th>Al>Ce.
The Photochemistry of Ketene the Reactions of Methylene with Toluene and P‐Xylene in Vapor Phase (II)
Authors: Ho Shih Yeng , Lee Min‐Pone
Published: June 2015

In the photolysis of ketene with toluene in the vapor phase, ethylbenzene, xylenes, 2‐methylcycloheptatriene‐1, 3, 5, and three unidentified compounds are found as the products of the reactions of methylene with toluene. In the ketene‐p‐xylene system, p‐ethyltoluene, 1,2,4‐trimethylbenzene, 1,4‐dimethylcyclohepatriene‐1,3,5, and three unidentified compounds are obtained as the products of the reactions of methylene with p‐xylene. The reaction mechanism is discussed.
Studies on Enolisation of Some β‐Diketones by Spectrophotometric Method
Authors: Taneja A. D. , Srivastava K. P. , Gupta M. C.
Published: June 2015

Enolisation of acetoacetanilide (AAAH) acetoacet ortho‐toluidide (AATH), 2, 4‐acetoacetxylidide (AAXH), acetoacet‐ortho‐chloroanilide (CAAAH), acetoacetortho‐anisidide (OAAAH), benzoyl‐acetanilide (BAAH) and benzoyl‐meta‐nitro‐acetanilide (NBAAH) have been studied in different solvents of varying polarities, ranging from chloroform (z=63.2) to methanol (Z=83.6) by ultraviolet spectroscopic methods. The low percentages of enol contents in formamide, dimethylformamide and dimethylsulphoxide, may be due to the formation of charge transfer complexes of these solvents with the diketones. Free energy of tautomerisation has also been calculated. The substituents on the phenyl group attached to the nitrogen have no effect on enolisation.
Studies on the Constituents of Formosan Salvia Plebeia R. Br. (I) On the Flavonoid Components of Salvia Plebeia R. Br.
Authors: Yang Tsang‐Hsiung , Chen Kuo‐Tung
Published: June 2015

Salvia plebeia R. Br. is an annual herb of Labiatae and is widely distributed in the central area of Taiwan. It has been used as folk‐medicine for the treatment of hepatitis and tumors.1) From the flavonoid enriched fraction (B) of the alcoholic extracts of this plant, four kinds of flavonoid compound were isolated. Two of these were confirmed as 5,4′‐dihydroxy‐6‐methoxy‐7‐glucosyloxy flavone (I). (homoplantaginin, hispidulin‐7‐glucoside) and 5, 7, 4′‐trihydroxy‐6‐methoxy flavone (II) (hispidulin) on the basis of their spectral, chemical evidences and comparison with authentic samples. The other two were assigned to be 5, 3′, 4′‐trihydroxy‐6‐methoxy‐7‐glucosyloxy flavone (III) (nepitrin, eupafolin‐7‐glucoside) and 5,7,3′,4′‐tetrahydroxy‐6‐methoxy flavone (IV) (eupafolin, nepetin) on the basis of chemical and spectral properties. The flavones, II (hispidulin) and IV (eupafolin), have been shown to have cytotoxic activity against human carcinoma of the nasopharynx carried in cell culture (KB).13)
Spectrophotometry Studies of Uranyl Chelate of 7‐Iodo‐8‐Hydroxyquinoline‐5‐Sulphonic Acid
Authors: Hseu Tong‐Ming , Kuo Kuo‐Nan
Published: June 2015

Uranyl chelate of 7‐iodo‐8‐hydroxyquinoline‐5‐sulphonic acid (ferron) has been studied spectrophotometrically in aqueous solution at 25° and at an ionic strength of 0.1 M. The formation of this chelate was pH dependent, and the optimum pH range was between 5.4 to 5.9, Its mole ratio of ligand to uranyl ion was found to be 2 to 1 stoichiometry and the stability constant, log K, was determined as 13.32±0.08. By using the wave‐length of 365 mu, determination of trace amount of uranyl ion with the sensitivity of 0.54 γ/cm2 was possible.
Meta‐Nitro‐Benzoylacetanilide as a Reagent for Iron
Authors: Taneja A. D. , Srivastava K. P.
Published: June 2015

Meta‐nitrobenzoylacetanilide (NBAA) forms violet coloured chelate Fe(NBAA)2 with Fe (III) in 60% ethanol medium with λmax at 530 nm. The molar absorptivity, sensitivity, effect of diverse ions in spectrophotometric determination of iron, and effect of ionic strength on the stability constant have been investigated. The free energy of formation of the chelate, enthalpy change and the entropy change have also been calculated and are found to be −9.44 kcal/mole, −4.97 kcal/mole and 15.23 e.u. respectively.
Maximum Interaction Model Force Constant Calculation of the Mlx (Co)6‐x Type Molecule
Authors: Chen Cheng , Hsiang Chu‐Chiang
Published: June 2015

C—O stretching frequency of inorganic carbonyl molecules is quite characteristic in the vibrational spectroscopy (the IR and Raman). Since such stretching modes are quite different from the skeletal modes, a non‐mechanical coupling model has been proposed by Cotton1). The C—O stretching force constants and their interaction constants may be calculated semiquantitatively from their characteristic frequencies. The trouble is that the number of vibrational frequencies is always less than the number of force constants, whenever a symmetry irreducible representation contains more than one frequency. Cotton suggest that the interaction constants for octahedral type molecule from the dpπ bonding point of view1‐2). Instead of this, a model of maximum interaction between M—C—O bonds is proposed in this paper. Such model not only gives better remedy to the problem of octahedral complexes, but also is useful to solve the normal modes in molecules of trigonal bipyramidal and many other symmetries.
The Reaction of 2‐Methylindole with Pyruvic Acid
Authors: Zee Sheng‐Hsu , Lin Sheng‐Yunn , Fin Tei‐Min
Published: June 2015

The reaction of 2‐methylindole with pyruvic acid was studied. Two products are found to be depending on experimental conditions, including the 2:2 condensation adduct and the 2:1 condensation adduct. The reaction mechanism evidently involves a 1:1 adduct of 2‐hydroxy‐2‐(2‐methylindol‐3‐yl)‐propionic acid as an intermediate.
Synthesis of 4′‐Phenylflavones
Authors: Hsu K. K. , Shi J. Y.
Published: June 2015

In order to study the relationship between structure and activity of flavones, several new 4′‐phenylflavones, 4′‐phenylflavonols, and 4′‐phenylflavanones are synthesized by cyclization of corresponding 4‐phenyl‐2′‐hydroxychalcones with selenium dioxide in hot amyl alcohol, with hydrogen peroxide in cold alkalic ethanol, or with phosphoric acid in hot ethanol, respectively. The 4‐phenyl‐2′‐hydroxychalcones are synthesized by condensation of p‐phenylbenzaldehyde with various 2′‐hydroxyacetophenones in hot methanol under presence of potassium hydroxide.
Studies on the Alkaloids of Formosan Lauraceous Plants. XVI.) Alkaloids of Neolitsea Variabillima (Hay.) Kanehira Et Sasaki
Authors: Lu Sheng‐Teh , Su Tsann‐Long
Published: June 2015

Three alkaloids have been isolated from the barks of Neolitsea variabilima (Hay.) Kanehira et Sasaki, and these have been identified with L‐hernovine (XIII), L‐nandigerine (XIV), and L‐N‐methylhernovine (XV) respectively.
Effect of Solvents on the Spectra of Some β‐Diketones
Authors: Taneja A. D. , Srivastava K. P. , Gupta M. C.
Published: June 2015

Acetoacetanilide, benzoylacetanilide and their derivatives have been examined in ultraviolet region in a series of solvents covering a broad polarity range e. e. from chloroform (Z, 63.2) to methanol (Z .83.6). Transition energies and oscillator strengths have been calculated and transition energy (ET) has been plotted against Z‐values, a new empirical measurement of solvent polarity. A linear relationship was observed between the transition energy and Z‐values for π → π* and n → π* transitions. These transitions are identified as charge transfer (c‐t) transitions and with the solvents having carbonyl oxygen and sulphur atom a c‐t complex formation has been suggested. Strong electron‐donating substituents on phenyl group of the nitrogen atom also showed a weak to moderate n → π* transitions. These substituents have no influence on the position of the λmax in the same solvent. Stabilization energy of the excited state of these ligands and hence the dipole moments of the excited states have been calculated in comparison with pyridinium iodide. Solvent sensitivities of these ligands have also been calculated.
Alkoxy Derivatives of Tricyclopentadienyl Cerium (IV)
Authors: Kapur Miss Shushma , Multani R. K. , Kalsotra B. L.
Published: June 2015

Tricyclopentadienyl cerïum(IV) chloride has been treated with various primary and secondary alcohols in benzene medium in the presence of triethylamine to give compounds, (C5H5)3Ce(OR) wherein R may be CH3 C2H3, n‐C2H3, iso‐C3H7, N‐C4H9, iso‐C4H9 and iso‐C3H11. Infrared spectra and some physical characteristics of all these compounds and reported.
An Internal‐Reference Method for Determination of Lanthanum, Cerium and Europium in Monazite Sand by Neutron Activation Analysis
Authors: Pung Tong‐Chuin , Wu Shaw‐Chii , Tsai Hui‐Tuh
Published: June 2015

A non‐destructive method was developed for the determination of lanthanum, cerium and europium in monazite sand by neutron activation analysis with gold as the internal‐reference element.

Black and yellow monazite sands mined from south Tung‐Sen‐chou of Taiwan were analyzed and compared. The sensitivity and relative error were estimated for each element.