bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantitative Analysis of Clove Oil by NMR Spectrometry
Authors: Chiang Hung‐Cheh , Wang Pei‐Lein , Huang Keh‐Feng 
Published: June 2015

AbstractA procedure utilizing NMR spectrometry in the quantitative analysis of clove oil is described. The 1H‐NMR spectrum is determined with acetophenone as internal standard, the 13C‐NMR spectrum is determined with chloroform as internal standard and 0.1M Cr(acac)3 as relaxation reagent. The contents of eugenol are compared to the results obtained from G.C. (90.8%, s.d. 0.7%) and from chemical method (89.6% s.d. 1.2%).The result obtained from 1H‐NMR method is 90.4% (s.d. 0.3%) and from 13C‐NMR method is 90.5% (s.d. 0.7%). The time required for the 1H‐NMR method is about 20mins and for the 13C‐NMR method is about 2‐3hours. Apparently the 1H‐NMR method proves to be more simple, rapid and accurate.
Chemical Reactions of Coumarins and Furocoumarins on Thin‐Layer Chromatoplates
Authors: El‐Tawil B. A. H. , El‐Beth F. K. A. 
Published: June 2015

AbstractMost of the reaction achieved in this work were conducted with coumarin and furocoumarin. The reactions were performed on inert thin‐layer chromatoplates under controlled conditions and the products of the reactions were compared as usual with the expected substances on the same chromatogram. The reactions performed were: mineral acid hydrolysis, methylation, acetylation, benzoylation, nitration and Schiff's bases on silica gel chromatoplates.
On the Reduction of Copper Oxide
Authors: Wang Hong‐Paul , Yeh Chuin‐Tih 
Published: June 2015

AbstractThe reduction of CuO with hydrogen has been studied with a temperature programmed reduction technique. According to a proposed reduction mechanism, the reduction was initiated with a interaction between hydrogen and active sites of copper oxide, the rate of the reduction was limited by the diffusion of water from the crystalline. The activation energy of this diffusion is found to be 13Kcal/mol. Reoxidation of copper powder may cause redispersion of the crystalline. The chemical interaction between copper oxide and Cabosil is found very weak.
Determination of Metal Ions by High Performance Liquid Chromatography
Authors: Hwang Jon‐Mau , Chang Fu‐Chung , Yeh Yu‐Chai 
Published: June 2015

AbstractThe mixture of metal ions [Bi(III), Fe(III), Fe(II), Cu(II), Zn(II), Ni(II), Co(II), Pb(II), Cd(II), Mn(II)] were separated in the bonded‐phase strong cation exchange column (Vydac‐401 SA) and monitored at 540 nm after a postcolumn reaction with 4‐(2‐pyridylazo)‐resorcinol (PAR). Citrate, tartrate, lactate and α‐hydroxyisobutyrate buffer were used as eluent and it has been found that the elution order of some metal ions were changed with different eluents. The detection limits and the calibration curves of metal ions were also studied.
Thermodynamic Studies on the Complexation Reactions of Copper(II) Complex of o2n2‐Donor Macrocycle with Halide and Pseudohalide Ions
Authors: Wang Bind , Lin Yi‐Jen , Chung Chung‐Sun 
Published: June 2015

AbstractComplexation reactions of 5,6,7,8,9,10,16,17‐octahydrodibenzo[e, m][1, 4]dioxa‐[8, 11]diazacyclotetradecine‐copper(II) complex with halide and pseudohalide ions have been studied at 25.0° in three water‐methanol mixed solvents by spectro‐photometric method. It is found that the equilibrium constants increases in the order of 50 vol.% CH3OH<75 vol.% CH3OH<95 vol.% CH3OH for solvents and I‐<Br−<CI−<SCN−, N−3 for anions.
The Observation of Metastable Transitions in a High Resolution Double Focussing Mass Spectrometer
Authors: Lin D. P. 
Published: June 2015

AbstractThree metastable transitions are observed with 31 5‐t‐butyldimethylsiloxy‐dehydrosterone (BDMS‐DHEA) by detecting their daughter ion at m/z 269 in a double focussing mass spectrometer. Because of their specificity, the transitions of molecular ion could be served as quantitation routes for the determination of the steroid in human blood plasma using direct insertion probe with ionization chamber temperature ≥230°C. Thus, as is in MS/MS it would significantly reduce sample work‐up time and possibly eliminate the need for a GC separation in detecting the level of this steroid in human blood.
Determination of Ga, Th, and U in Bauxite and Coal Ash by Epithermal Neutron Activation Analysis
Authors: Wu H. C. , Chen S. G. , Tsai H. T. 
Published: June 2015

AbstractNeutron activation analysis is applied to the determination of Ga, Th and U in Bauxite and coal ash; thermal and epithermal irradiations are used. The other analytical methods are also quantitatively surveyed for gallium. The results indicate that epithermal neutron activation is prefered for those trace elements because the former method is more simple and quick.
Using NAA to the Determination of Antimony in Trichlorosilane with Substoichiometric Extraction
Authors: Chen S. G. , Tsai H. T. 
Published: June 2015

AbstractNeutron activation analysis has been applied to the determination of trace of antimony based on the substoichiometric extraction of Sb(III) with BPHA (N‐benzoyl‐N‐phenyl hydroxylamine). The antimony contens in trichlorosilane or high purity silicon can be determined by the proposed method down to ppb range. The effect of acid concentration, shaking time, the amount of carrier and the decontamination factors were studied.
Spectrophotometric Determination of Dioxovanadium (V) Ion Using Some Halogen Derivatives of Phenylazo‐Chromotropic Acid
Authors: Badawy S. S. , Issa Y. M. 
Published: June 2015

AbstractA comparative study of the reaction of o‐chloro‐, m‐chloro‐, p‐chloro‐, p‐bromo‐ and p‐iodophenylazo‐chromotropic acids with dioxovanadium (V) ion have shown that 1:1 and 1:2 violet water soluble complexes were formed at pH 4.5. The p‐halogeno‐derivatives were found to be very suitable reagents for spectrophotometric determination of VO+2 up to 8 ppm. The application of these dyes as indicators in the spectrophotometric titration of VO+2 with EDTA and the interference of a various cations and anions were reported.
Synthesis of Cardioactive Steroids III Modified Synthetic Route to Isocardenolide
Authors: Shiao Min‐Jen 
Published: June 2015

AbstractA modified synthetic route to isocardenolide (I) via furan intermediate (6) was studied. The diene (4) could easily be synthesized from carbinol (1) or acetate (2). Dissolving metal reduction of diene (4) to Δ1, 17β‐furyl compound (6) was successfully achieved.
Solvent Extraction Studies of Two Isomeric 5, 7, 7, 12, 12, 14‐Hexamethy‐1, 4, 8, 11‐Tetraazacyclotetradecanes
Authors: Liu Landie , Wu Jung‐Chung , Chung Chung‐Sun 
Published: June 2015

AbstractThe distribution ratios of two isomeric 5, 7, 7, 12, 12, 14‐hexamethyl‐1, 4, 8, 11‐tetraazacyclotetradecane, tet c and tet d, in several solvent systems at 25.0°C as functions of hydrogen ion concentration were determined. The protonation constants and the distribution constants of these macrocyclic ligands and their protonated species were obtained from the variations of the distribution ratios in the range of 6<–log [H+]<14.
A Spectroscopic Study of the Hemiammine Dicobalt (II) Species
Authors: Chu Vincent H. K. 
Published: June 2015

AbstractInfrared spectrum of amyl amine forming cobalt complex in benzene solution is described. The D, value and transitions between d orbitals are identified. Since few transition metal salts are soluble in inert solvent, this paper introduces a special method of making cobalt‐2‐ethyl‐hexanoate which is soluble in benzene.
Diels‐Alder Reactions of 6,9‐Dipropyl‐1, 4‐Dioxaspiro[4.5]Deca‐6, 8‐Diene‐2, 10‐Dione with Substituted Alkenes. An Entry to Bicyclo[2.2.2]Oct‐5‐Ene‐2, 3‐Diones and 1, 3‐Cyclohexadienes
Authors: Hsu Y. H. , Kuo L. C. , Liao C. C. , Lin H. S. , Uang B. J. 
Published: June 2015

AbstractThe cycloadditions of the title compound, 1, a masked 3, 6‐dipropyl‐o‐benzoquinone to various disubstituted (diethyl maleate, diethyl fumarate, trans‐ and cis‐stilbene, and cycloheptene) and monosubstituted alkenes (methyl acrylate, methyl vinyl ketone, styrene, ethyl vinyl ether, and 1‐hexene) have been studied; the yields of the Diels‐Alder adducts, 2, are generally high (> 75%) except for stilbenes. These adducts are effectively transformed into the corresponding bicyclo[2.2.2]oct‐5‐ene‐2, 3‐diones, 3, whose stereochemistries are determined from the ring current effect of the respective quinoxalines, 4, on the chemical shifts of the vinyl and the methine protons and/or the lanthanide (Eu(fod)3) induced shift on the pertinent protons of 3. It is interesting to note that the quinoxaline ring current makes the vinyl protons down‐field shifted by 0.15–0.27 ppm whereas the methine protons (R3=H) syn to the quinoxaline moiety up‐field shifted by 0.18–0.39 ppm as compared to the chemical shifts of the corresponding protons in 3. The transformations of α‐diketones 3 into the corresponding 1, 3‐cyclohexadienes, 5, by irradition with a Hanovia medium pressure lamp through a uranium glass filter are almost quantitative. The present study provides facile and effective methods for the preparation of bicyclo[2.2.2]oct‐5‐ene‐2, 3‐diones and 1, 3‐cyclohexadienes from catechols via masked o‐benzoquinones.
Molecular Structure of trans‐4‐p‐Tolylcyclophosphamide
Authors: Liu Ling‐Kang 
Published: June 2015

AbstractThe ‘trans’ assignment to the slower eluting diastereomer of 4‐p‐tolylcyclophosphamide is confirmed with a direct structure determination by X‐ray crystallography. The compound crystallizes in the monoclinic space group P2,/c with Z=4 and cell dimensions a=11.636(4), b=12.394(5), c= 11.819(5)Å, β=93.9(3)°. Final R and R are 0.063 and 0.063, respectively.
Determination of Trace Molybdenum in Biological Matrices by Neutron Activation Analysis
Authors: Lo Jem Mau , Yeh Si Jung 
Published: June 2015

AbstractBased on consecutive extractions using bismuth diethyldithiocarbamate and thallium diethyldithiocarbamate as reagents, molybdenum was selectively and highly enriched from biological matrices, and then subjected to neutron activation analysis. Most of interfering elements, e.g., Na, K, Br, P, Fe, U, etc. were simultaneouly removed and the preconcentrated samples always showed only the r rays from molybdenum after neutron bombardment. Thus, molybdenum in the biological matrices could be accurately determined.
Chemistry of Leave Extractives from Cineole Tree
Authors: Kuo Yueh‐Hsiung , Chen Wen‐Chau , Lin Yau‐Tang 
Published: June 2015

AbstractFrom the acetone extractive of the leaves of Cinnamomum camphora Sieb (cineole tree), β‐sitosterol, sesamin, dotriaconyl alcohol, piperitol, xanthoxylol, cinnamonol, β‐sitosteroyl‐l‐β‐glycopyranoside, and a new compound dotriaconyl‐trans‐coumarate were isolated.
A Stereospecific Synthesis of Cis‐3‐Substituted‐2, 2‐Dimethylcyclopropane‐L‐Carboxylates
Authors: Huang Chun‐Hsien , Chen Jih‐Sang 
Published: June 2015

AbstractA stereospecific synthesis of cis‐3‐substituted‐2, 2‐dimethylcyclopropane‐1‐carboxylates based on the cyclization of 5‐bromolactone 2 to give bicyclic lactone 3 is described.
Synthesis of Ethyl Methyl Ether Over Solid Acid Catalysts
Authors: Ebeid Fikry M. , Ali Laila I. 
Published: June 2015

AbstractThe alkylation of methanol by triethylamine to form ethyl methyl ether was studied in the temperature range 310‐330°C using γ‐alumina and silica‐aluminas differing in their silica content. The effect of treating γ‐alumina with hydrochloric and boric acid on the reaction rate was also investigated. The results obtained for ether formation over γ‐alumina show that the reaction is first order for methanol and zero orde for triethylamine. Alumina‐H3BO3 was found to be the most active catalyst whereas alumina‐HCl is the least active towards ether formation. The activity of silica‐alumina is proportional to its silica contents.
An Automated Reagent‐Addition System with an Infrared Drop Detector
Authors: Marqubz Daniel V. , Aguilar Raul , Chang C. Allen 
Published: June 2015

AbstractThe design and implementation of a computer‐controlled automated reagent‐addition system is presented. A special feature is the use of an infrared drop detector to sense that a drop of the titrant has indeed been added to the titrate. This system is particularly useful for the determination of stability constants of metal complexes. The operational procedure is briefly discussed and examples are given to show that reproducible results are obtained.
Chemistry of o‐Benzoquinones and Masked o Benzoquinones VII.: Regioselective and Stereoselective Cycloadditions of 6, 7‐Dipropyl‐ and 8, 9‐Eipropyl‐1, 4‐Dioxaspiro[4.5] deca‐6, 8‐Di‐En‐2, 10‐Dione with Monosubstituted Ethylenes
Authors: Kuo Li‐Ching , Liao Chun‐Chen 
Published: June 2015

AbstractThe cycloadditions of the titled two masked o‐benzoquinones, 2 and 3, with monosubstituted ethylenes including ethyl acrylate, styrene, ethyl vinyl ether and 1‐hexene were studied. The reactions proceeded with high stereoselectivity and regioselectivity to give endo head‐to‐head adducts when ethyl acrylate, styrene and ethyl vinyl ether were used as addenda. In the case of 1‐hexene, the reaction with 2 took place with high regioselectivity but low stereoselectivity to afford endo as well as exo head‐to‐head adducts while the reaction with 3 occurred with less regioselectivity to produce presumably all the eight possible isomers. The regiochemistry of the adducts were determined by the 1H nmr analysis of their hydrolysis products, bicyclo[2,2,2]oct‐5‐en‐2,3‐diones 6, and the subsequent photolysis products, 1,3‐cyclohexadienes 7. The stereochemistry was established by the study of the lanthanide induced shifts of compounds 6a‐6f with Fu(fod)3. The regioselectivity and stereoselectivity of these cycloaddition reactions were explained in terms of frontier molecular orbital theory and steric effect. The present study provides also a facile method to prepare regioselectively bicyclo[2, 2, 2]oct‐5‐en‐2,3‐diones (stereo‐selectively also) and 1,3‐cyclohexadienes from unsymmetric catechols via masked o‐benzoquinones.
1,3‐Dipolar Cycloaddition of 5‐Substituted‐1‐Methyl‐3‐Oxidopyridiniums
Authors: Chen Ling‐Ching , Wang Eng‐Chi , Lin Jen‐Hom 
Published: June 2015

Abstract5‐Methoxy‐ and 5‐dimethylamino‐1‐methyl‐3‐oxidopyridiniums were shown to give the 1,3‐dipolar cycloadducts widely with methyl acrylate, acrylonitrile, N‐phenylmaleimide, styrene, phenylacetylene, cyclopentadiene, cyclopentene, diethyl azodicarboxylate and singlet oxygen.
Mössbauer Spectroscopic Studies of Supported α‐Fe2O3 and Fe Catalysts I: Particle Size Determination and Support Effect
Authors: Wei Ho‐Hsiang , Lin Kuen‐Hai 
Published: June 2015

AbstractThe chemical state of particles of 5wt% Fe in α‐Fe2O3 and the subsequently reduced iron particles supported on different particle size (50–200 mesh) of silica (SiO2), alumina (Al2O3), magnesium oxide (MgO) and carbon (C) was examined by Mössbauer spectroscopy at various stages of calcination and reduction. The particle size of the α‐Fe2O3 supported on different mesh sizes (50, 100, 140, 200 mesh) of SiO2 has been determined. The strength of metal‐support interaction with respect to the kind of support was found to be MgO>SiO2>Al2O3>C.
Dissociation Constants of P‐Nitroanilinium Ion in Tetrahydrofuran‐Water Mixtures at 25°C by Spectrophotometric Measurements
Authors: El‐Harakany A. A. , Ramadan M. Sh. 
Published: June 2015

AbstractA spectrophotometric method has been used for the determination of the dissociation constant of P‐nitroaniline indicator (which has a charge type A+B0) in various THF‐water solvent mixtures at 25°C. The dissociation constant is found to decrease with the addition of THF which indicates that the basicity of the medium is increased by the addition of the organic solvent.The relative basicity of the medium is compared with other aqueous‐organic solvent mixtures and the trend of decreasing basicity is in the order THF‐H2O> DMF‐H2O > AN‐H2O > HAC‐H2O.
The Mechanism of Schiff Base Formation of Some Arylidenes‐p‐Aminosalicylic Acid
Authors: Adam F. A. , El‐Haty M. T. , Ibrahem A. A. 
Published: June 2015

AbstractFormation of a series of Schiff bases derived from p‐aminosalicylic acid I and various aromatic aldehydes has been studied kinetically in ethanol medium in presence of piperidine as a basic catalyst. The order of the reaction is determined to each reactant by following the concentration of the Schiff base formed during the reaction. The reaction is Kinetically third‐order in the presence of low concentration of piperidine, first‐order to each of I, aldehyde and piperidine. On the other hand, in presence of ≥5×10−4 M of piperidine the order of the reaction changed to second‐order, thus much the reaction is independent of piperidine concentration. The rate determining step is suggested to be the dehydration of the carbinolamine intermediate step 4. Variation in reaction rate constants with the different substituent of the aromatic aldehyde, with substituents of aromatic amine and with the nature of the hydroxylic organic solvents as reaction medium are studied and discussed.
Syntheses and Mass Spectral Studies of (E)‐1‐Alkanesulfonylpropenes and (E)‐1‐Alkanesulfinylpropenes
Authors: Liu Lilian‐Kao , Hwang Wen Shwong 
Published: June 2015

Abstract(E)‐1‐Alkanesulfonylpropenes and (E)‐1‐Alkanesulfinylpropenes have been synthesized in good to excellent yields. Studies correlating molecular structure and fragmentation patterns upon electron impact have been carried out. Double hydrogen rearrangements with the elimination of alkenyl radicals are the most facile fragmentations for (E)‐1‐alkanesulfonylpropenes. Single hydrogen rearrangement with alkene elemination is however the most important fragmentation for (E)‐1‐alkanesulfinylpropenes. In this case the hydrogen atom only migrates to the sulfinyl oxygen. These differences in fragmentation patterns between the (E)‐styryl‐alkyl‐sulfones/sulfoxides and the (E)‐propenyl‐alkyl‐sulfones/sulfoxides are attributed to the fact that different ionization sites are involved.
Syntheses of 1‐Azaazulan‐2‐One Analogs of Adrenergic Agents
Authors: Wu Chi‐Phi , Jiang George J. , Hung Ya‐Yung , Yang Paw‐Wang 
Published: June 2015

AbstractThe Friedel‐Crafts reaction of 1‐azaazulan‐2‐ones with α‐haloacid chloride in the presence of aluminum trichloride gives the corresponding α‐haloacyl derivatives. Treatment of these reaction products first with various secondary amines and then with sodium borohydride gives new adrenergic active amine derivatives.
Interfacing the Biomation 6500 Transient Digitizer to an Apple II Microcomputer
Authors: Su S. G. , Tsai C. H. , Su T. ‐M. , Mou C. Y. 
Published: June 2015

AbstractAn interface is described which permits high‐speed data transfer between the Biomation 6500 waveform digitizer and an Apple II microcomputer system. Through the interface, one can make any number of scans of repetitive data which, having been acquired by the Biomation 6500, may then be averaged, stored and analyzed in a microcomputer environment.
Spectrophotometry Determination of Cobalt after Extraction of its Ternary Complex with 3‐(4‐Phenyl‐2‐Pyridyl)‐5,6‐Diphenyl‐1,2,4‐Triazine and Tetraphenylborate into Molten Naphthalene
Authors: Lin Jenn‐Lin 
Published: June 2015

AbstractThe reaction of 3‐(4‐phenyl‐2‐pyridyl)‐5,6‐diphenyl‐1,2,4‐triazine (PPDT) and tetraphenylborate (TPB) with cobalt (II) has been studied to determine the optimum conditions for the extraction and quantitative spectrophotometry determination of this metal. The ternary complex is extracted into molten naphthalene at pH 3.6–7.4. The solid naphthalene containing the cobalt associated complex is separated by filtration and dissolved in acetonitrile. Beer's law is obeyed in the concentration range 8–140 μg cobalt in 10 ml of acetonitrile solution. The molar absorptivity and sensitivity are 4.2×103 l·mol−1·cm−1 and 0.01408 μg/cm2, respectively. The other factors such as pH, amounts of reagents and naphthalene, shaking and standing times, and the effect of diverse ions are studied. The method has been applied to the determination of cobalt in iron steel alloys.
Quantitative Determination of Iron Carbonyls on Polymer Supports
Authors: Chou Ta‐Shue , Yuan Yeh‐Jing , Feng Jung‐Jung 
Published: June 2015

AbstractWith the aid of FTIR analysis, the absolute amount of iron carbonyl complexes attached to a DVB/styrene copolymer backbone and the ratio of the biscoordination product to the monocoordination product were determined. These determinations were based upon the relative IR peak absorption areas at 2040 cm−1, 1880 cm−1, and 2915 cm−1 for the C=O stretching of monocoordination product, biscoordination product, and the C—H stretching of polymer backbone, respectively.
Regioselective Acylation of Cyclic α‐Silylallyl Sulphide
Authors: Chen Ling‐Ching , Chen Lih‐Ming , Lin Lih‐Hom 
Published: June 2015

AbstractAcylation of cyclic α‐trimethylsilylallyl sulphide (3) by reaction with the acid halide catalyzed by aluminum chloride in CH2Cl3 at −78°C gave compound 4 in good yield with extremely high regio‐selectivity.
Synthesis of 5‐(3‐Tert‐Butylamino‐2‐Hydroxy) Propoxy‐3,4‐Dihydrocarbostyril
Authors: Chen Ling‐Ching , Lin Jen‐Hom , Wu Shihn‐Sheng 
Published: June 2015

Abstract5‐(3‐tert‐Butylamino‐2‐hydroxy) propoxy‐3, 4‐dihydrocarbostyril (1, carteolol) was prepared by an acid‐catalyzed cyclization of the N‐pivaloylamino‐ester (5), which was obtained by using organolithiation of m‐pivaloylanisidine, followed by Wittig and catalytic hydrogenation reactions. The total yield of 1 obtained from m‐anisidine (2) is 21%.
Reactions of Aroylhydrazones, IV: Synthesis of Nitrogen Heterocycles from Opianic Acid Hydrazones
Authors: Nassr Mahmoud A.M. , El‐Badry Sousan M. , Smaban Mohammed A.E. 
Published: June 2015

AbstractOpianic acid reacts with various hydrazines to yield either hydrazone (3, 6) or phthalazinone (4) derivatives depending upon the electronic properties of the substituent attached to the hydrazine molecule. Oxidative cyclization of opianic acid aroylhydrazones with iodine and yellow mercuric oxide gave the 1,3,4‐oxadiazole derivatives 21. The aroylhydrazones were also condensatively cyclized by heating with acetic anhydride to give the 1,3,4‐oxadiazoline derivatives 24. Structures assigned to the prepared compounds were corroborated by studying their chemical as well as their spectral characteristics.
Structure of 5‐Amino‐4‐Arylazopyrazoles in Ethanolic Aqueous Media
Authors: Fahmy H. M. , Elnagdi M. H. , Mahgoub A. Elsaid , Kasem A. , Ghali E. A. 
Published: June 2015

AbstractThe structure and tautomerism of 5‐amino‐4‐arylazopyrazoles (2a‐f) are investigated in aqueous media. In solutions of pH>5 these compounds exist as ring N—1 protonated species. At pH>10 they afford anions which are stabilized by delocalization of the negative charge in the ring as well as on the arylazo moiety. Controlled potential electrolysis and polarographic analysis indicate that 2a‐f are reduced via a four electron reduction process to triaminopyrazole and the corresponding substituted aniline derivative. A mechanism is suggested and discussed.
Reduction of Cd(II) and Mn(II) at the Dropping Mercury Electrode in the Presence of 1,3,5‐Trihydroxybenzene in Aqueous Sodium Perchlorate
Authors: El‐Maraghy Salah B. , Gutmann V. , Linert W. 
Published: June 2015

AbstractReduction of Cd2+ at the dropping mercury electrode in solutions of 1, 3, 5‐trihydroxybenzene was carried out in nonbuffer solutions of 0.1 M NaClO4. The polarogram consists of two waves, the first wave can be taken in quantitative determination of Cd2+ in solutions containing 3.5 mM 1, 3, 5‐trihydroxybenzene in 0.1 M NaClO4. Mn2+ produces single well‐defined diffusion controlled irreversible wave whose half‐wave potential shifts to a more negative value with increasing 1, 3, 5‐trihydroxybenzene. Me(II) forms two weak complexes, MX1 and MX2 at 25°. The behaviour of this metal ions is summarized.