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Archive By Volume
Acta Chimica Sinica 1953 Vol.19
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Preliminary Experiments on the Making of Thermistor Beads
By Neng-Yuan Wu, Jen-Yuan Chien
Acta Chimica Sinica 1953, 19 (2): 69-76.
Published: 04 June 2013
Abstract
(
306
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PDF
(499KB)(
297
)
Knowledge map
Many oxides of heavy metals when existing not in exact stoichiometric ratite exhibit the properties of a semi-conductor. The resistance of has a very urge negative temperature coeff cient. Such thermally sensitive resistors, known as "therxnisters", have found wide range of applications in thermometry, communication engineering, etc.
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A Study of the Scission of Ethylene Oxide Ring in α-Methyl 2:3-Anhydro-4:6-benzylidene-D-allopyranoside by Sodium Benzylate
Pang Chang, Lythgoe Cambridge
Acta Chimica Sinica 1953, 19 (2): 77-85.
Published: 04 June 2013
Abstract
(
330
)
PDF
(582KB)(
554
)
Knowledge map
The anhydro ring in a-methyl 2:3-anhydro-4:6-benzylidene-D-allopyranoside has been opened by the action of sodium benzylate to give 53% yield of a-methyl 2-benzyl-4:6-benzylidene-D-altropyranoside and 9% of a-methyl 3-benzyl-Q:6-benzylidene-D-glucopyranoside. After the removal of the benzylidene residue by acid hydrolysis, the position of attaclunent of the benzyl group is determined by periodate oxidation.
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Diazonium Salt Type Reaction of α-p-Nitrophenyl-β-acylhydrazine Ⅰ.Synthesis of p-Nitrobromobenzene and α-p-Nitrophenylpyridine
Wen-Kuei Hwang
Acta Chimica Sinica 1953, 19 (2): 86-88.
Published: 04 June 2013
Abstract
(
436
)
PDF
(179KB)(
586
)
Knowledge map
p-Nitrobromobenzene was prepared from the sodium salt of a-p-Nitrophenyl-β-acetyl-hydrazine by bromination and subsequent addition of copper catalyst. Similary, a-p-nitrophenyl-pyridine was obtained by adding pyridine instead of copper catalyst.
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Zur Bestimmung des Magnesiums mittels Titangelbs
Pui-Hang Tam, Tien-Hui Shen, Shu-Chuan Liang
Acta Chimica Sinica 1953, 19 (2): 89-92.
Published: 04 June 2013
Abstract
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328
)
PDF
(276KB)(
411
)
Knowledge map
Die Bestiinmungsmethode fur Magnesium mittels Titangelbs wind unteisucht. Daraus ergibt sich folgendes:Obwohl durch Zusatz Kalziumionen die Farbe des Magnesium Titangelbs vertieft wird, gehorcht die hichkurve dem Beeischen Gesetz zu von einein geringeren Grade als diejenige ohne Kalziumzusatz.
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A New Volumetric Method for the Determination of Fluorine
Yasuyuki Miyahara
Acta Chimica Sinica 1953, 19 (2): 93-102.
Published: 04 June 2013
Abstract
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348
)
PDF
(665KB)(
548
)
Knowledge map
In view of the necessity of a rapid and accurate process for the determinution of fluorine applicable in the analysis of sodium fluoride and other fluorine compounds, the author has established a new volumetric process consisting in the titration in aqueous-alcoholic medium with ferric nitrate as standasd solution and sodium salicylatc as indicator.
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p-Dimercaptobenzene Used as a Bismuth Reagent
Kuei Wang
Acta Chimica Sinica 1953, 19 (2): 103-105.
Published: 04 June 2013
Abstract
(
350
)
PDF
(188KB)(
838
)
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Based on the study of the structures of the known organic reagents for bismuth detection, it is suspected that the functional group responsible for the reaction with bismuth ion is merely the mercapto-group. Thus, the reagent properties of simple thiophenols are studied. A two percent solution of p-dimercaptobenzene in ethyl alcohol gives a yellowish orange spot with bismuth ions by means of spot test techniques. Mercuric, mercurous, silver, lead and nitrite ions interfere. Limit of identification: 3 gamma.. Concentration limit:1:17,000. Although it is not sensitive enough to be used as a reagent in spot test, this result indicates that a further study on the derivatives of the thiophenols may be valuable.
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The Determination of Molybdenum and Tungsten Ⅷ.The Estimation of Molybdenum as Barium Molybdate(Ⅱ)
by Shu-Chuan Liang, Pui-Hang Tam
Acta Chimica Sinica 1953, 19 (2): 106-108.
Published: 04 June 2013
Abstract
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380
)
PDF
(195KB)(
614
)
Knowledge map
In a previous paper, [Liang and Hsii: Jour. Chinese Chew. Soc. 17, 90 (1950)],we reported on the optimum conditions for determinin;, molybdenum as barium molybdate. In the present investigation it is found that the barium molybdate method may be employed to determine as low as b mg of MoO
3
in 200 ml of solution. The minimum concentration of excessive precipitant may be set at 5×10
-4
M, below which complete precipitation can not be attained. The presence of any metal that forms a slightly soluble hydroxide in solutions with a plf value edual to or greater than 6 is objectionable. The method requires the absence of even small quantities of zinc, a,nd permits the presence of less than 0.01 M of magnesium.
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Phntometric Determination of Magnesium in Cast Iron with Titan Yellow
Hou-Chi Wong, Shih-Yen Loh, Szu-Chi Dzao
Acta Chimica Sinica 1953, 19 (3): 109-116.
Published: 04 June 2013
Abstract
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312
)
PDF
(544KB)(
577
)
Knowledge map
An electrophotometric method has been worked out for the determination of magnesium in cast iron using titan yellow as indicator.Briefly,the method consists of dissolving the sample in dilute sulphuric acid,separating iron and other metals such as copper and nickel by electrolysis with mercury cathode and precipitating manganese from ammoniacal solution with ammonium persulfate.Ammoniwn salt,silica,and traces of alumina.ase thenremoved.Finally,the prepared titan yellow reagent is added to the solutionand the magnesium content determined from the electrophotometric reading.The time required for each determination is approXimately 5 hours.
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α-Diphenylmethyl-cyclohexanone
Pang Chang
Acta Chimica Sinica 1953, 19 (3): 117-120.
Published: 04 June 2013
Abstract
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365
)
PDF
(269KB)(
650
)
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Condensation of methyl β-keto-cyclohexane-carboxylate with diphenyl bromomethane in boiling benzene gives rise to methyl α-diphenylmethyl-β-keto-cyclohexane-carboxylate.Hydrolysis of the keto ester with 10% alcoholic potash opens the ring to give α-diphenylmethyl-pimelic acid,the thoriwn salt of which,on pyrolysis at 400-450°,yields α-diphenyhnethyl-cyclo-hexaxione as expected.
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β-Benzyl 2:3-anhydro-4:6-benzylidene-D-alloside and Its Reaction with Sodium Benzylate
Pang Chang, Basil Lythgoe
Acta Chimica Sinica 1953, 19 (3): 121-128.
Published: 04 June 2013
Abstract
(
375
)
PDF
(532KB)(
468
)
Knowledge map
β-Benzyl 2:3-anhydro-4:6-benzylidene-D-a,lloside(Ⅳ) has been prepared from β-benzyl D-glucoside.Its behaviour towards,sodium benzylate has been obserzred to follow the same course as the corresponding a-methyl analogue,for the expected product,β-benzyl 2-benzyl-4:6-benzylidene-D-altroside(Ⅴ),is isolated.These observations demonstrate that the alteration of the glycosidic group as well as its configuration does not,at least in the case of the above compound studied,interfer with the course of formation of the ethylene oxidertng.
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Glucose Esters of Higher Fatty Acids Ⅰ. Synthesis of Monopalmitate, Monostearate and Mixed Penta-esters of D-Glucose
Lung-Hsiang Chang, Yung-Shih Chen
Acta Chimica Sinica 1953, 19 (3): 129-138.
Published: 04 June 2013
Abstract
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528
)
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587
)
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Six new compounds,namely,diacetone glucose monopaImitate,diacetone glucose monostearate,D-glucose monopalmitate,D-glucose monostearate,D-glucose tetraacetate monopalmitate,and D-glucose tetra,acetate monostearate,have been synthesized and some of their properties have been described.Monoesters of glucose and higher fatty acids have been shown to be surfaceactive and possess good emulsifying property.Both D-glucose monopalmitate and monostea.rate exhibit polymorphism a.nd each compound exists in four polymorphic forms.Diacetone glucose monopahnitate,diacetone glucose monostearate,D-glucose tetraacetate monopalmitate,D-glucose tetra,aceta.te monostearate are all low-melting crystalline subst;Lnces,and no polymorphism has been observed among them.
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Glucose Esters of Higher Fatty Acids. Ⅱ. Polymorphism of D-Glucose Pentapalmitate
Lung-Hsiang Chang, Yung-Shih Chen
Acta Chimica Sinica 1953, 19 (3): 139-143.
Published: 04 June 2013
Abstract
(
405
)
PDF
(327KB)(
604
)
Knowledge map
Polyxnorphism of α-D-glucose pentalwlmitate has been studied by the comparison of melting points of different crystalline forms obtained under different conditions,by the determination of transition points,and by the observation of cooling and heating curves of the penta-ester.from these investigations,it has been shown at least four polymorphic forms exist in the case of a-D-glucose penta.palmitate:Form Ⅰ,Ⅱ,Ⅲ,and Ⅳ,melting at 61.2°,66.4°,70.7°,and 76.4℃ respectively.Among these four forms,Ⅰ and Ⅲ are stable crystalline form which can be obtained directly by recrystallization under different conditions.Form Ⅱ and Ⅳ have not been obtained by recrysta,llization in this investigation and their existence is inferred from the determination of transition points and from the observation of cooling and heating curves.
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Synthesis of N-Nicotinyl-3-butoxy-4-methylaniline
Chang-Hai Chow
Acta Chimica Sinica 1953, 19 (3): 144-146.
Published: 04 June 2013
Abstract
(
253
)
PDF
(165KB)(
597
)
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Three new compounds:4-vitro-2-butoxy-toluene,3-butoxy-4-methylaniline hydrochloride and N-nicotinyl-3-butoxy-4-methylaniline have been synthesized.
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Gravimetric Determination of Sulphur as Barium Sulphate Ⅶ. Effect of Cupric and Zinc Ions
SHU-CHUAN LIANG, TIEN-HUI SHEN, HUI LIU
Acta Chimica Sinica 1953, 19 (4): 147-152.
Published: 04 June 2013
Abstract
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360
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PDF
(510KB)(
784
)
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The effects of copper and zinc ions upon the precipitation of barium sulphate have been noted for a long time.However,the results published were either not systematic
(3,4b,5,6)
or obtained under conditions apart from usual analytical practice
(7,8)
.
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Benzoylisothiocyanate as a Reagent for the Identification of Alcohols
YAO-TSo CHEN
Acta Chimica Sinica 1953, 19 (4): 153-155.
Published: 04 June 2013
Abstract
(
357
)
PDF
(199KB)(
687
)
Knowledge map
In boiling acetone solution benzoylisothiocyanate reacts readily with alcohols to form N-benzoylthiourethans,which in most cases are well crystallized solids with sharp melting points.Since the reagent is easily prepared,the procedure affords a convenient method for the identification of alcohols.
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Cited: Baidu(
3
)
Reduction with Glucose or Invert Sugar in Alkaline Solution——A New Method for the Preparation of Several Aminophenolic Compounds
WEN-KUEI HWANG
Acta Chimica Sinica 1953, 19 (4): 155-160.
Published: 04 June 2013
Abstract
(
502
)
PDF
(359KB)(
319
)
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o
-Nitrophenol,
p
-nitrophenol.4-vitro-2-methyl-phenol; 2,6-dichloro-4-nitrophenol,
p
-nitrosophenol,4-nitroso-2-methyl-phenol,α-nitroso-β-naphthol,
p
-hydroxy-azobenzenesulfonic acid and Orange II were reduced satisfactorily to the corresponding aminophenolic compounds by glucose or invert sugar in alkaline solution.
m
-Nitrophenol and 2,4-dinitrophenol gave negative results.Due to high yield and easy manipulation,this method may be used with in the laboratory preparation of aminophenolic compounds.
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Determination of Sesamin in Sesame Oil, and Sesamin Content in Oils of Sixteen Varieties of Chinese Sesame Seeds.
YU-CHING TU, SHUI-LUEN HWANG
Acta Chimica Sinica 1953, 19 (4): 160-166.
Published: 04 June 2013
Abstract
(
389
)
PDF
(424KB)(
367
)
Knowledge map
A reagent prepared from 2 volumes of 78-79% H
2
SO
4
solution and 1 volume of 26-27% H
2
O
2
solution is capable of giving with sesamm a green coloration finally turning yellow.The yellow color may be utilized for the quantitative determination of sesamin,and satisfactory results can be obtained.method has been employed to determine the sesamin content in oils of 16 varieties of Chinese sesarmn seeds,which ranges from 0.92% up to 1.80%.Oils containin hihg quantities of sesamin should have promising potential uses as asynergist in combination with pyrethrin oil sprays.
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The Determination of Cerium by Precipitation as Iodate from Homogeneous Solution
SHU-LIEN TSAI
Acta Chimica Sinica 1953, 19 (4): 167-174.
Published: 04 June 2013
Abstract
(
447
)
PDF
(546KB)(
490
)
Knowledge map
When cent iodate is precipitated from acid solution by the addition of a soluble iodate,a gelatinous precipitate is obtained,which is difficult to filter and wash.The precipitate must be redissolved and reprecipitated as oxalate for final ignition to carie oxide.
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Viscosity Measurements on the Binary Solution h-Butyl Alcohol—N-Ethylaniline
JEN-YUAN CHIEN, CHEN-EU LI
Acta Chimica Sinica 1953, 19 (4): 176-183.
Published: 04 June 2013
Abstract
(
383
)
PDF
(462KB)(
740
)
Knowledge map
The viscosities of the binary solutions of n-butyl alcohol and N-ethylaniline have been measured at 15.00℃ in an Ubbelohde viscometer.The fluidities of n-butyl alcohol and N-ethylaniline were found to be 29.61 and 39,06 rhes respectively,while the solution at ca.30 mole percent butyl alcohol shows a maximum fluidity of 41.10 rhes.
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Some Physical and Chemical Constants of Python Snake Fat
YUEH WANG, CHING-CHEN LI
Acta Chimica Sinica 1953, 19 (4): 184-185.
Published: 04 June 2013
Abstract
(
382
)
PDF
(134KB)(
310
)
Knowledge map
2.6 kilograms of raw was obtained from a python (
Python molurusbivittatus Schlegel
) weighing 21.4 kilograms.The fat was isolated by cold pressing,frying and extraction with ether respectively.The physical and chemical constants of these isolated samples were determined.
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