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Acta Chimica Sinica 1957 Vol.23 Please wait a minute... РЕАКЦИЯ ПРИСОЕДИНЕНИЯ ГАЛОИДА К НЕПРЕДЕЛЪНЫМ СОЕДИНЕНИЯМ ПРИ РАЗЛИЧНЫХ РАСТВОРАХ Ⅰ.РЕАКЦИЯ ПРИСОЕДИНЕНИЯ ХЛОРА И КАРБОНОВОГО КИСЛОТ ХуАн ХуА-МИН Acta Chimica Sinica    1957, 23 (1): 1-3.   Published: 03 June 2013 Abstract （433）      PDF （210KB）（323）       Knowledge map    При вэаимдействии бромистого аллила и хлора,кислота (HCOOH;CH3COOH) получается γ-бром β-хлор проилацетат [Ⅰ],γ-бром β-хлор пропилформиат [Ⅱ] и β-бром β'-хлор иэопропилацетат [Ⅲ]. Related Articles | Metrics THE PREPARATION OF CYCLOHEXANE CARBOXYLIC ACID AND ITS ESTERS Ho PING-LUM, JOHN H. BILLMAN Acta Chimica Sinica    1957, 23 (1): 4-8.   Published: 03 June 2013 Abstract （432）      PDF （352KB）（763）       Knowledge map    Pureponding benzoic acid,methyl benzoate,and ethyl benzoatewere hydrogenated to the corres-based cyciohexane carboxylic acid and its corresponding derivatives with quantitative conversion.on the amount of hydrogen absorbed.Some of the batches were fractionately distilled;yields from 80——85°were obtained. Related Articles | Metrics ДИАГРАММА ПЛАВКОСТИ СИСТЕМЫ BeSO4-N2 SO4 П. И. Федоров, Чжан Чи-юин Acta Chimica Sinica    1957, 23 (1): 9-13.   Published: 03 June 2013 Abstract （352）      PDF （293KB）（599）       Knowledge map    Изчена диграмма состояния двойной системы сулъфата натрия с сулъфатом бериллия. Related Articles | Metrics A DIFFERENTIAL REFRACTOMETER CHIEN JEN-YUAN, SHEN SHOW-PENG, SHIH LIANG-Ho, WU JEN-CHIH, CHANG TEH-Ho Acta Chimica Sinica    1957, 23 (1): 14-18.   Published: 03 June 2013 Abstract （438）      PDF （431KB）（695）       Knowledge map    The differential refractometer described here was designed on the principle of light refraction at two liquid interfaces.A beam of monochromatic light (436 or 546 mgt) passing through a hollow glass cell of square cross-section filled- with solution and immersed in the solvent was refracted.The displacement of the slit images of the rays passing through the two halves of the solution prism was magnified by a lens of long focal length. Related Articles | Metrics THE SYNTHESIS OF 4-ARYL-5-HALO-DIOXANE-1, 3 AND SOME RESEARCHES ON PRINS REACTION HSING CHI-YI, TAI CHIEN-HUAN, HSUEH LIAN-CHY Acta Chimica Sinica    1957, 23 (1): 19-29.   Published: 03 June 2013 Abstract （434）      PDF （707KB）（344）       Knowledge map    Recently,Funke and Kornmann synthesized chloramphenicol from 4-aryl-5-halo-dioxane-1,3 which was obtained by the addition of hypobromous acid to cinnamyl alcohol and followed by cyclization with benzaldehyde. Related Articles | Metrics ИССЛЕДОВАНИЕ СИСТЕМЫ ЛИТИЙ-УГЛЕРОД П. И. ФЕдорнв, Су МЕэн-цзэн Acta Chimica Sinica    1957, 23 (1): 30-39.   Published: 03 June 2013 Abstract （500）      PDF （572KB）（521）       Knowledge map    Система литий-утлерод иэучаласъ методом термического аналиэа. Related Articles | Metrics AN INVESTIGATION OF PHASES IN CHINESE ALUNITE ROCK TANG YOU-CHI, CHOU KUNG-DU, HO JEN-YUNG Acta Chimica Sinica    1957, 23 (1): 40-51.   Published: 03 June 2013 Abstract （335）      PDF （688KB）（528）       Knowledge map    In the present investigation,the principal phases in alunite rock from Ping-Yang and Lu-Kiang have been studied.They were α-quartz,hematite and alunite.The latter was a mixed crystal of the type (K,Na)Al3(SO4)2=(OH)6.In alunite rock,α-quartz and hematite were embeded in the alunite phase.In order to elucidate the nature of the alunite phase in alunite rock,the lattice constants and structural parameters of sodium alunite were determined and compared with those of potassium alunite. Related Articles | Metrics THE WATER CONTENT AND THE STABILITY OF BLEACHING POWDER TANG YOU-CHI, HUA TUNG-WEN, LIAU KUEI-FEN, CHIH FANG-CHIEH, LIN SZE-HUANG Acta Chimica Sinica    1957, 23 (1): 52-67.   Published: 03 June 2013 Abstract （385）      PDF （962KB）（713）       Knowledge map    In the present investigation,water in bleaching powder was found to play a leading role in determining the stability of the latter.In order to compare the stability of various samples of bleaching powder,we determined the content of the available chlorine before and after a sample kept in a small class-stonoered tube at 90°C for 8 hours. Related Articles | Metrics ANHYDRO SUGARS. PART Ⅳ. METHYL 2, 3-ANHYDRO-α-AND-β-D-LYXOMETHYLOSIDE CHAHG PANG, LIU YUOH-TING Acta Chimica Sinica    1957, 23 (1): 68-75.   Published: 03 June 2013 Abstract （359）      PDF （576KB）（513）       Knowledge map    The title compounds were synthesized respectively from methyl 2,3-anhydro-α- and β-D-lyxofuranoside (Ⅳ,α and β).This consists of: Methyl 2,3-anhydro-α- and β-D-lyxofuranoside (Ⅳ,α and β)→methyl 2,3-anhydro-5-O-toluene-ρ-sulphonyl-α- and β-D-lyxofuranosid ( Ⅴ,α and β )→methyl 2,3-anhydro-5-iodo-5-deoxy-α-and β-D-lyxofuranoside (Ⅵ,α and β)→methyl 2,3-anhydro-α-and β-D-lyxomethyloside (Ⅶ,a and β).All the intermediates are crystalline except the last ones. Related Articles | Metrics A NEW SYNTHESIS OF TARTRONIC ACID CHANG PANG, WU SHAO-LAN Acta Chimica Sinica    1957, 23 (1): 76-78.   Published: 03 June 2013 Abstract （392）      PDF （182KB）（776）       Knowledge map    Ethyl benzyloxymalonate was shown to be hydrolyzed readily by alkali to yield sodium or potassium benzyloxymalonate which could be transformed into the crystalline free acid.On catalytic hydrogenolysis of the benzyl residue,tartronic acid was obtained in good yield. Related Articles | Metrics POLAROGRAPHY OF URANIUM IN PHOSPHORIC ACID CH'I TÊ-YAO Acta Chimica Sinica    1957, 23 (2): 79-89.   Published: 03 June 2013 Abstract （317）      PDF （646KB）（504）       Knowledge map    In this article the polarographic behaviours of uranium in phosphoric acid have been studied.In phosphoric acid solutions of moderate concentrations, two distinct waves are observed.These are interpreted as to correspond to reactions the reductions to UⅤ, and to UⅣ.With increasing concentrations of phosphoric acid, UⅤ is less stable and decomposes at the dropping electrode.Therefore the first wave increases, but the total wave height remains unchanged.If the dismutation of UⅤ is complete, or nearly so, then only one wave results, because UⅣ forms stable complex with H3PO4, and does not show a reduction wave before hydrogen is discharged. Related Articles | Metrics STUDIES ON SILICIC ACID AND ITS SALTS Ⅰ. RATE OF GELATION AND MECHANISM OF POLYMERIZATION OF SILICIC ACID TAI AN-PANG(A. P. TAI), KIANG LCNG Acta Chimica Sinica    1957, 23 (2): 90-98.   Published: 03 June 2013 Abstract （439）      PDF （594KB）（914）       Knowledge map    In a wide pH range, the rate of gelation of silicic acid formed by the reaction of water glass with various acids was determined.The curve which expresses the relation between pH and log.of time of setting of silicic acid solution is N-shaped, having a maximum and a minimum, no matter what kind of acid was used to react with water glass.However, with different acids, the positions of the maximum and minimum points are different. Related Articles | Metrics Cited: Baidu(15) PREPARATION OF PHOSPHORAMIDES LI SI-OH, CHANG CHI-PING Acta Chimica Sinica    1957, 23 (2): 99-104.   Published: 03 June 2013 Abstract （329）      PDF （365KB）（352）       Knowledge map    Phosphoramides are prepared for enzyme studies.These compounds can be easily obtained by refluxing one mole of amidodichlorophosphate and two moles of anhydrous formic acid in an anhydrous organic solvent for about three hours.The high yield and the simple procedure for isolation of the product make this method superior to those described in the literature.By this method we have so far obtained the phosphoramide compounds of aniline, p-chloroaniline, a-naphthylamine, sulfanilamide, o-methoxyaniline.p-toluidine and benzylamine.However, this method has failed in the preparation of N-(p-nitrophenyl) amidophosphoric acid and N-(p-carboxyphenyl) amidophosphoric acid.The latter can be obtained by the reaction of amidophosphoryldichloride of p-aminobenzoyl chloride and formic acid. Related Articles | Metrics CHEMOTHERAPEUTIC STUDIES ON SCHISTOSOMIASIS Ⅱ. ANTIMONY DERIVATIVES OF SOME MERCAPTOCARBOXYLIC ACIDS HSIEH YU-YUAN, CHANG SING, YANG IN-TSON, KYI ZU-YOONG Acta Chimica Sinica    1957, 23 (2): 105-111.   Published: 03 June 2013 Abstract （394）      PDF （482KB）（541）       Knowledge map    Attempts have been made to prepare less toxic antimonials for use in chemotherapy on Schistosomiasis japonicum.It has been established[5] that 2,3-dimercaptopropanol is a powerful antilewisite because it forms a stable ring compound (Ⅱ) with arsenic.It seems reasonable to suppose that analogous cyclic antimony mercaptides (such as IV and V) should ibe difficult to dissociate and therefore would be less toxic. Related Articles | Metrics QUINAZOLONE Ⅰ. SYNTHESIS OF 3-(ω-DIALKYLAMINOALKYL)-QUINAZOLONE-4 CHI YUOH-FONG, SHOWN GUO-SHUNG Acta Chimica Sinica    1957, 23 (2): 112-116.   Published: 03 June 2013 Abstract （316）      PDF （319KB）（436）       Knowledge map    Anthranilic acid condensed with N-w-dialkylaminoalkyllformamide to form 3-(ω-dialkylaminoalkyl)-quinazolone-4.The following 3-substituted quinazolone-4(ⅡA,ⅡB, ⅢA, ⅢB) were described. . Related Articles | Metrics GALLEIN AS A REAGENT FOR COLORIMETRIC DETERMINATION OF TRIVALENT ANTIMONY PANG SHU-WEI, LU MING-LEIN Acta Chimica Sinica    1957, 23 (2): 117-123.   Published: 03 June 2013 Abstract （349）      PDF （362KB）（507）       Knowledge map    The work of detecting trivalent antimony with the aid of 4,5-dihydroxyAuorescein (gallein), as proposed by Wang Kuei, has been extended to quantitative determination.The substance formed is insoluble in many organic solvants and is only slightly soluble in water.When 0.3 ml of 0.5% sulfonated castor oil is added to the water solution, it becomes stable even at 40°. Related Articles | Metrics THE VAPOR PHASE CHLORINATION OF METHYL SILANES CHEN YAO-TSO, CHEN SAN-MEI, WANG PAO-JEN Acta Chimica Sinica    1957, 23 (2): 124-129.   Published: 03 June 2013 Abstract （400）      PDF （386KB）（837）       Knowledge map    Methyl silanes of the types (CH3)nSiCl4-n and (CH3)mSi(CH2Cl)Cl3-m have been photochemically chlorinated in the vapor phase.It was found that the structure of the dichlorinated silanes formed was greatly influenced by the presence of Si}CI bond.Silanes with no Si-Cl bond behaved similarly as the hydrocarbons,i.e., the substitution of two Cl-atoms for hydrogen occurred on different C-atoms in preference to the same C-atom, while the presence of the SiCl bond made the reverse to.be true, the gem-dichloro-compound predominated.According to the authors' opinion, this discrepency is due to the fact that the Si-Cl bond exerts an inhibitive effect on the a-methyl group in the event of chlorination, and, at the same time, a promotive effect on the a-chloromethyl group so as to make it easier to be further chlorinated. Related Articles | Metrics Cited: Baidu(2) THE ALKALOIDS OF CHINESE DRUG, TZU-TSAO-WU, ACONITUM SPP. Ⅱ. ISOLATION OF A NEW ALKALOID, ISOACONITINE. CHU JEN-HUNG, HUNG SHAN-HAI, CHOU YUN-LEE Acta Chimica Sinica    1957, 23 (2): 130-135.   Published: 03 June 2013 Abstract （349）      PDF （393KB）（502）       Knowledge map    In the previous commuication, one of us (Chu) reported the isolation of a new alkaloid from the leaves and stems of Chinese Aconitum.A.delavayi Franch.Its local anaesthetic action is found to be twice as much as that of cocaine.This paper describes the isolation of a second new one from the root of another aconitum spp.collected from the same region; its empirical formula is the same as that of aconitine, but differs in melting point and other properties, so that the name isoaconitine is provisionally assigned. Related Articles | Metrics THIAZELE RESEARCH Ⅳ. CHEMISTRY OF 4, 4’-DICHLOROMETHYL-2, 2’-DITHIAZOLYL. SYNTHESIS OF HEXAALKYL 2, 2’-DITHIAZOLYL-4, 4’-DIMETHYL DIAMMONIUM SALTS. CHI YUOH-FONG, CHU TING-I Acta Chimica Sinica    1957, 23 (2): 136-144.   Published: 03 June 2013 Abstract （394）      PDF （596KB）（566）       Knowledge map    Dithio-oxanude condensed with 1,3-dichloroacetone in acetone in the presence of precipitated calcium carbonate to form 4,4'-dichloromethyl-2,2'-dithiazolyl (I).It melted at 165°.The condensation between these two compounds was complicated by the formation of polymeric compound in case they were heated in ethanol at its boiling temperature. Related Articles | Metrics PYRIMIDINE RESEARCH：THE ACTION OF AMINES AND HYDRAZINE ON ETHYL 2-METHYLMERCAPTO-4-METHYL-PYRIMIDINE-5-CARBOXYLATE CHI YOUH-FONG, WU YUAN-LIU Acta Chimica Sinica    1957, 23 (2): 145-152.   Published: 03 June 2013 Abstract （390）      PDF （528KB）（544）       Knowledge map    Ethyl Z-methylmercapto-4-methyl-pyrimidine-5-carboxylate (m.p.53-54°)was synthesized by condensing ethyl ethoxymethylene-acetoacetate with S-methylpseudothiourea sulfate in ethanol in the presence of sodium ethylate.Its structure was substantitated through the conversion into its corresponding acid, 2-methylmercapto-4-methyl-pyrimidine-5-carboxylic acid, melting at 169-171°.The latter dissolved in dilute sodium bicarbonate solution and did not give iodoform test.This acid could be converted into its silver salt, which reacted with ethyl iodide to form the original ester. Related Articles | Metrics СИСТЕМАТИЧЕСКИЙ ХОД КАЧЕСТВЕННОГО АНАЛИЗА НЕОРГАНИЧЕСКИХ КАТИОНОВ С ПОМОЩЪЮ ХРОМАТОГРАФИИ Мэн Най-чан Acta Chimica Sinica    1957, 23 (2): 153-155.   Published: 03 June 2013 Abstract （380）      PDF （179KB）（535）       Knowledge map    Показана возмжность применения органических красителей как 《индикторы》 для неорганических хроматограмм. Related Articles | Metrics A NOTE ON THE CONSTITUENTS OF ARISTOLOCHIA DEBILIS, SIEB. ET ZUCC. TSENG KWONG-FONG(K. F. TSENG), KU YUNG-TANG Acta Chimica Sinica    1957, 23 (2): 156-157.   Published: 03 June 2013 Abstract （345）      PDF （138KB）（288）       Knowledge map    Ching-Mu-Hsiang, root of Aristolochia debilis, Sieb.et Zucc., is one of the Chinese drugs used in hypotension therapy.From this drug the authors have succeeded in isolating three crystalline components; among which two were obtained as tiny yellow needles, m.p.275° (I) and m.p.269°(Ⅱ); the other one formed white needles, m.p.235°(Ⅲ).The last component (Ⅲ) was identified as allantoin by its mercury complex, and no melting point depression was ohserved on admixture with authentic specimen. Related Articles | Metrics VOLATILIZATION PROCESS IN THE CUP-ELECTRODE SOLUTION ARC SOURCE AND SPECTROGRAPHIC ANALYSIS OF OPEN-HEARTH SLAGS HO I-DJEN, WANG THANG-SOO, LI SHIH-CHO Acta Chimica Sinica    1957, 23 (3): 159-168.   Published: 03 June 2013 Abstract （379）      PDF （710KB）（513）       Knowledge map    Following the development of the copper cup-electrode solution method for the spectrographic analysis of open-hearth slags, a series of experiments was carried out to study the volatilization process in such a spectral light source. The correlation of the different volatilization curves obtained with different experimental conditions revealed that the volatilization process may be considered as of two stages. Related Articles | Metrics ANHYDRO SUGARS.PART Ⅴ.METHYL 2, 3-ANHYDRO-β-D-RIBOMETHYLOSIDE CHANG PANG(P. CHANG), LIU YÜOH-TING Acta Chimica Sinica    1957, 23 (3): 169-174.   Published: 03 June 2013 Abstract （377）      PDF （442KB）（559）       Knowledge map    The title compound was synthesized from D-xylose. Methyl α- and β-D-xylofuranoside mixture (Ⅱ), prepared according to Levene et al.[3-6] Related Articles | Metrics ANHYDRO SUGARS.PART Ⅵ.METHYL 2, 3-ANHYDRO-α-D-LYXOMETHYLOSIDE CHANG PANG(P. CHANG), FANG YI-MEI Acta Chimica Sinica    1957, 23 (3): 175-178.   Published: 03 June 2013 Abstract （411）      PDF （289KB）（885）       Knowledge map    Byt the same route outlined in Part Ⅲ of this series[1], the title compound was prepared from D-arabinose by five stages of reactions. Related Articles | Metrics THE OPTIMUM CONDITION AND QUANTUM YIELD OF OZONE FORMATION BY MERCURY RESONANCE RADIATION CHEN SHIH-WEI(S. W. CHEN) Acta Chimica Sinica    1957, 23 (3): 179-187.   Published: 03 June 2013 Abstract （354）      PDF （635KB）（661）       Knowledge map    Under atmospheric pressure, the shorter line 1849.6Å,but not the longer line 2537.5Å,of mercury resonance radiation is responsible for ozone formation in oxygen. The presence of van der Waals molecule, O4 or (O2)2, has no influence on ozone formation. Related Articles | Metrics MECHANISM AND QUANTUM YIELD OF OZONE FORMATION BY MERCURY PHOTOSENSITIZATION CHEN SHIH-WEI(S. W. CHEN) Acta Chimica Sinica    1957, 23 (3): 188-195.   Published: 03 June 2013 Abstract （386）      PDF （540KB）（444）       Knowledge map    Formation of ozone by mercury photosensitized reaction was extensively studied. The longer line 2537.5Å of mercury resonance radiation can produce ozone indirectly through the excitation of mercury atoms, whereas the shorter line 1849.6Å accomplishes this reaction both directly and indirectly. Related Articles | Metrics POLAROGRAPHIC STUDIES OF METAL COMPLEXES Ⅱ.THE CADMIUM-THIOCYANATE SYSTEM TSIANG HON-GEE, HSU KWANG-HSIEN Acta Chimica Sinica    1957, 23 (3): 196-200.   Published: 03 June 2013 Abstract （490）      PDF （357KB）（626）       Knowledge map    The half wave potential of the cadmium ion was de:ermintd at 25℃ in sodium perchlorate-sodium thiocyante mixtures over the range of 0.02-2.2 M thiocyanate at an ionic strength of 3.00. The errors in the difference between the half wave potentials of the simple and complex ions were estimated to be less than ±0.2 mv. Related Articles | Metrics Cited: Baidu(9) IDENTIFICATION OF THE NON-VOLATILE ACIDS IN PLANT TISSUES BY PAPER CHROMATOGRAPHY HSU CHIA-HSIANG(CHIA-HSIANG HSU) Acta Chimica Sinica    1957, 23 (3): 201-209.   Published: 03 June 2013 Abstract （386）      PDF （627KB）（795）       Knowledge map    The study of the paper chromatography of organic acids was undertaken to provide a simple method for the identification of the organic acids in plant tissues. With the technique of ascend ing development, the Rf values of seven organic acids were determined as follows. Related Articles | Metrics Cited: Baidu(4) STUDY OF THE NEUTRAL PRINCIPLE FROM THE CHINESE DRUG, CHIN-KUO-LAN, CALYSTIGIA HYDRACEAE HUANG WEI-YUAN, CHU JEN-HUNG Acta Chimica Sinica    1957, 23 (3): 210-214.   Published: 03 June 2013 Abstract （377）      PDF （330KB）（718）       Knowledge map    The neutral principle isolated from the Chinese drug. Chin-Kuo-lan, Calystigia hydraceae (Convolvalaceae) was identified as Columbin, the bitter principle of Columbo root, Jatrorrhiza palmata, Miers (Menispermaceae). Related Articles | Metrics Cited: Baidu(2) SHEAR DEPENDENCE OF THE VISCOSITY OF POLYMETHYLMETHACRYLATE IN BENZENE Ⅱ.THE PARAMETERS OF INTRINSIC VISCOSITY MOLECULAR WEIGHT RELATIONSHIP BY LIGHT SCATTERING CHIEN JEN-YUAN, SHIH LIANG-HO, SHIH KWAN-I Acta Chimica Sinica    1957, 23 (3): 215-222.   Published: 03 June 2013 Abstract （428）      PDF （2654KB）（579）       Knowledge map    The viscosities of five fractionated polymethylmethacrylate samples in benzene have been determined in an Ubbelohde dilution viscometer under vanous external hydrostatic pressures. Related Articles | Metrics Cited: Baidu(1) THE FORMATION OF SOLID DERIVATIVES OF ALDEHYDES：2-SUBSTITUTED-1, 3-BIS(p-CHLOROBENZYL)TETRAHYDROIMIDAZOLES CHEN JU-YU, JOHN H. BILLMAN Acta Chimica Sinica    1957, 23 (3): 223-229.   Published: 03 June 2013 Abstract （325）      PDF （380KB）（451）       Knowledge map    (1)1,2-Bis (p-Chlorobenzylamino) ethane has been found to be a very satisfactory reagent for the identification of aldehydes. This diamine did not react with acetone or the other ketones tested. (2) Twenty new solid derivatives of 1,3-bis (p-Chlorobenzyl) tetrahydroimidazole have been prepared. Related Articles | Metrics THE IDENTIFICATION OF CALYSTIGINE AS PALMATINE HUANG WEI-YUAN, CHEN YUH-CHENG, CHU JEN-HUNG Acta Chimica Sinica    1957, 23 (3): 230-233.   Published: 03 June 2013 Abstract （350）      PDF （267KB）（653）       Knowledge map    Calystigine, the alkaloid of the Chinese drug, Chin-Kuo-lan (Calystigia hydraceae), is identified as palmatine. Related Articles | Metrics Cited: Baidu(3) A NEW METHOD FOR THE CALCULATION OF THE ATOMIC ELECTRONEGATIVITY LI SHIH-TSIN Acta Chimica Sinica    1957, 23 (3): 234-237.   Published: 03 June 2013 Abstract （475）      PDF （269KB）（529）       Knowledge map    According to Mulliken's definition, the atomic electronegativity is closely allied to ionicity. So the electronegativity of an atom in the stable molecule may be considered as the electric potential at the ionic boundary. In other words, the electronegativity of an atom is directly proportional to its effective nuclear charge and inversely proportional to its ionic radius. By plotting this electric potential against Pauling's electronegativity scale, a linear relationship between them is obtained. Related Articles | Metrics UEBER DEN ANWENDUNGSBEREICH DER MODIFIZIERTEN KISHNER-WOLFFSCHEN METHODE von HUANG-MINLON, CHUNG TUNG-SHUN, KU TU-SING, CHOW WEI-ZAN Acta Chimica Sinica    1957, 23 (3): 238-240.   Published: 03 June 2013 Abstract （483）      PDF （202KB）（844）       Knowledge map    Um den Anwendungsbereich der modifizierten Kishner-Wolff Methode[1-3] zu erweitern, wurden solche Verbindungen mittels dieser Methode unter verschiedenen Bedingungen reduziert, die vielleicht gegen Alkali hei Erhitzen empfindlich Bind, oder die mit Hydrazinhydrat leicht pyrazol-, oder pyridazinverbindungen bilden, oder die durch Behandlung mit Alkali and Hydra zinhydrat nach originaler Kishner-Wolffscher Methode cyclopripanverbindungen[4] ergeben, oder bei denen die urspriingliche α,β-ständige Doppelbindung bei der Reduktion sick verschlebt[5]. Related Articles | Metrics POTENTIOMETRIC DETERMINATION OF CHLORIDE IONS WITH MERCURIC NITRATE TZOU SHIH-FU, TIAO HUAN-TSIANG Acta Chimica Sinica    1957, 23 (4): 241-245.   Published: 03 June 2013 Abstract （434）      PDF （312KB）（578）       Knowledge map    An improved potentiometric method for determination of chloride ions with mercuric nitrate is described. Silver-silver chloride electrode is used as the indicating electrode while the reference electrode is a silver-electrode, immersed i,n 0.1 N silver nitrate solution. The addition of an amount of ethyl alcohol, which equals to 74% of the total volume of solution at the end of titration, is advocated. Satisfactory results are obtained. Variations in concentration of mercuric chloride at the end point and pH of solution have no effect on titration results. Owing to the fact that no precipitate is formed during the titration, this method is easier to carry out than the argentometry. Related Articles | Metrics CHEMICAL STUDIES ON CHINESE DRUG CH’UAN HSIUNG (LIGUSTICUM WALLICHII FR.) KU YUNG-T'ANG, TSENG KWONG-FONG(K. F. TSENG) Acta Chimica Sinica    1957, 23 (4): 246-249.   Published: 03 June 2013 Abstract （425）      PDF （284KB）（492）       Knowledge map    The botanical name of the Chinese drug Chuan Hsiung had hitherto been mistaken as Conioselin-cna-enivittaturra, Turcz.(Unabellife-rae j). Recently it was found actually to be Ligustichin Wallichii, Fr. by the Nanking ChungShan Botanical Garden. This drug has long been used in China as, a sedative or as antispasmodic and also for the treatment of rheumatism. Related Articles | Metrics STUDIES ON THE APPLICATIONS OF ORGANIC CATIONS AS ANALYTICAL REAGENTS I.N, N-DIMETHYLPIPERIDINIUM IODIDE AS A REAGENT FOR PALLADOUS IONS YUNG CH'ING-HSIN, WANG K'UEI Acta Chimica Sinica    1957, 23 (4): 250-254.   Published: 03 June 2013 Abstract （391）      PDF （362KB）（615）       Knowledge map    1. N, N-Dimethylpiperidinium iodide is recommended as a reage palladous ions. In neutral or acidic solution, it forms a black or brown precipitate with palladous ions deperding on the amount of the latter present.The sensitivity is 0.2 r (1:200,000) on the spot plate and 0.006 r(1:200,000) on the filter paper. Related Articles | Metrics THE CONSTITUENTS OF THE CHINESE DRUG, KAI-HOCHIEN, ARDIS1A HORTORUM MAX. II. IDENTIFICATION OF ARDISIC ACID B AS BERGENIN HUNG SHAN-HAI, CHU JEN-HUNG Acta Chimica Sinica    1957, 23 (4): 255-258.   Published: 03 June 2013 Abstract （420）      PDF （222KB）（370）       Knowledge map    Ardisic acid B, isolated previously by one of us (Chu),from the Chinese drug, Kai-ho-chien, Ardisia hortorzcm Max. has been proved to be identical with bergenin, whkch was isolated for the first the from several species of Saxifrage by Garreau and M} chelart in 1880 and was characterized later as 2-tetrahydroxybutyl-4,6-dihydroxy-o-methoxyisocoumarin by Tschitschibabin and co-workers. Related Articles | Metrics CHEMICAL INVESTIGATION OF THE ROOT BARK OF SAPIUM SEBIFERVM ROXB. LIU CHU-TSIN, LOH JEN-YUNG, WU CHIH-HSING Acta Chimica Sinica    1957, 23 (4): 259-261.   Published: 03 June 2013 Abstract （412）      PDF （194KB）（589）       Knowledge map    The isolation and identification of phloracetophenone 2,4-dimethyl ether from the root bark of Sapium sebijeruera Roxb. (Chinese tallow tree) are reported. Related Articles | Metrics