bluuebunny/crossref_metadata_2025_split huggingface dataset:
Examen Diélectrique et Viscosimétrique de Quelques Nitrates Organiques
Authors: de Kreuk L. J. 
Published: September 2010

AbstractPour interpréter les phénomènes d'isomérie présentés par la nitroglycérine et d'autres nitrates organiques, l'auteur érige une hypothèse, qui est contrôlée par des mesures diélectriques et viscosimétriques.
The Raman spectrum and the molecular structure of thiophosphoryl chloride
Authors: Gerding H. , Westrik R. 
Published: September 2010

AbstractThe Raman spectrum of liquid thiophosphoryl chloride PSCl3 has been redetermined and the degree of depolarization of the Raman lines measured. The symmetry of the molecule is that of the point group C3v‐3m. An assignment of the frequency shifts found to modes of vibration of the molecule is given.
Über das Auftreten freier Radikale bei der Kolbe‐Reaktion Aromatischer Carbonsäuren. Die Elektrolyse von Diphenylessigsäure
Authors: v. d. Hoek A. J. , Th. Nauta W. 
Published: September 2010

AbstractBei der Elektrolyse von Diphenylessigsäure in methylalkoholischer Kalilauge und Pyridin nach Riccoboni1) wurden als nichtgasförmige Reaktionsprodukte identifiziert: Tetraphenyläthan, Di‐(diphenylmethyl)‐äther, Benzophenon, Diphenylmethyl‐methyläther, Stoffe die, ausgenommen der letztgenannte, auch bei der Halogenentziehung an Diphenylchlormethan mit molekularem Silber unter Sauerstoff gefunden worden sind.Durch diese Übereinstimmung in den Reaktionsprodukten ist Gleichheit des Reaktionsmechanismus und damit das Auftreten von freien Radikalen bei der Kolbe‐Reaktion als feststehend anzusehen.
Specific gravity ‐ composition, boiling point ‐ composition and vapour ‐ liquid equilibria relations for the systems methyl ethyl ketone ‐ water and sec. Butanol ‐ water
Authors: Boeke J. , Hanewald K. H. 
Published: September 2010

AbstractFor mixtures of methyl ethyl ketone and water and of sec. butanol and water, the following data were determined:specific gravity, 21°/21°boiling point,composition of the liquid at boiling temperature,composition of the vapour at boiling temperature.Commercially pure products were used.
Water soluble antihemorrhagic substances I: Synthesis of 2‐methyl‐4‐aminonaphthol‐1 hydrochloride and of 2‐methyl‐1,4‐diaminonaphthalene dihydrochloride, the water soluble synthetic vitamins K5and K6
Authors: Veldstra H. , Wiardi P. W. 
Published: September 2010

AbstractThe synthesis is described of 2‐methyl‐4‐aminonaphthol‐1 hydrochloride and of 2‐methyl‐1,4‐diaminonaphthalene dihydrochloride, both water soluble compounds possessing a high vitamin K activity. For the first mentioned substance this has already been reported by Emmett, Kamm and Sharp1), and in America the compound has been termed vitamin K5.In this communication we prove for the first time the high activity of 2‐methyl‐1,4‐diaminonaphthalene dihydrochloride, for which we propose the name vitamin K6. Information is given about the stability, toxicity and clinical value of the compounds obtained.
Eine Neue Methode zur Berechnung von Dipolmomenten
Authors: Böttcher C. J. F. 
Published: September 2010

AbstractStarting from considerations of Onsager and of the present writer a method is suggested for calculating dipole moments from measurements of the dielectric constant and the density of liquids containing one or more dipole components. By means of a number of examples it is shown that the dipole moments computed by means of the derived formulae are all but independent of the temperature and the concentration of the dipole substance, and sufficiently agree with those calculated with the aid of the usual methods.
The determination of tungsten as BaWO4
Authors: de Witte M. C. 
Published: September 2010

AbstractAn exact procedure has been worked out for the determination of tungsten as BaWO4. The solubility of the latter is taken into consideration, especially its dependence on the pH. Finally the BaWO4 method is compared with the other methods for determining tungsten and a procedure is given for the quantitative conversion of BaWO4 into WO3, when coprecipitation is to be feared.
2‐amino‐4‐méthylthiazol‐sulfamide‐5 et quelques dérivés
Authors: Backer H. J. , de Jonge J. 
Published: September 2010

AbstractLe mémoire décrit la préparation de quelques sulfamides qui diffèrent des sulfanilamides en ce qu'elles renferment le nouyau thiazol au lieu du nouyau benzénique.Une des nouvelles sulfamides (II) est un isomère du “sulfaméthylthiazol”. Une autre sulfamide (IV) renferme deux fois le noyau du méthylthiazol.
Zur analytischen Chemie des Zirkons: III. Die Bestimmung des Zirkons mit Arsensäure
Authors: Claassen A. , Visser J. 
Published: September 2010

AbstractDie Bestimmung des Zirkons mittels Arsensäure wurde nachgeprüft. Auf Grund von Löslichkeitsbestimmungen des Niederschlages wird eine neue Vorschrift für die Fällung in salzsaurer Lösung vorgeschlagen. Das geglühte Arsenat kann nur durch Abrauchen mit Schwefelsäure und Flusssäure in arsenfreies Oxyd übergeführt werden. Das Verfahren liefert bei einmaliger Fällung eine vollständige Trennung von grossen Mengen Kupfer, Cadmium, Vanadin V, Molybdän VI, Uran VI, Cer III, Eisen, Aluminium, Chrom, Nickel, Kobalt, Zink, Mangan, Magnesium, Calcium, Barium, Strontium und Alkalien. Eine Umfällung ist erforderlich zur Trennung von Wismut, Beryllium, Thorium, Zinn und Titan. Wolfram wird teilweise mitgefällt.
Deacylation of acetylamino compounds containing a nitro group in the ortho or para position
Authors: Verkade P. E. , Witjens P. H. 
Published: September 2010

AbstractAcetylamino compounds containing a nitro group in the ortho or para position are easily deacylated by boiling with alcohol in the presence of some sodium alcoholate, the acetyl group being split off in the form of an ester.
Die thermische Umlagerung einiger 1‐(Chlorphenyl)‐ und 1‐(Bromphenyl)‐Pyrrole
Authors: Wibaut J. P. , Dhont J. 
Published: September 2010

AbstractDurch trockene Destillation eines Gemisches von Schleimsäure und einem Halogenanilin wurden die folgenden Pyrrole bereitet: 1‐(4‐Chlorphenyl)‐pyrrol, 1‐(3‐Chlorphenyl)‐pyrrol, 1‐(2‐Chlorphenyl)‐pyrrol und l‐(3‐Bromphenyl)‐pyrrol.Bei der thermischen Umsetzung des 1‐(4‐Chlorphenyl)‐pyrrols bei 700° wurde ein einheitliches C‐(4‐Chlorphenyl)‐pyrrol erhalten; diese Verbindung war mit dem 2‐(4‐Chlorphenyl)‐pyrrol identisch, das aus 4‐Chlorbenzoylessigester, α,β‐Dichloräther und Ammoniak synthetisiert worden war.Die thermische Umlagerung des 1‐(3‐Chlorphenyl)‐pyrrols liefert ebenfalls ein einheitliches C‐(3‐Chlorphenyl)‐pyrrol; auch bei der Umlagerung des 1‐(2‐Chlorphenyl)‐pyrrols und des 1‐(3‐Bromphenyl)‐pyrrols werden wahrscheinlich einheitliche C‐(Halogenphenyl)‐pyrrole gebildet. Diese C‐Pyrrole müssen in Analogie mit dem 2‐(4‐Chlorphenyl)‐pyrrol als 2‐Pyrrolderivate aufgefasst werden.
The dipole moment and the constitution of nitrosyl chloride and nitrosyl bromide
Authors: Ketelaar J. A. A. 
Published: September 2010

AbstractThe dipole moments of nitrosyl chloride and nitrosyl bromide were determined as 1.83 ± 0.01 D and 1.87 D, respectively. These values are compared to those estimated for a pure homopolar structure ClNO. The conclusion is reached that an ionic structure: Cl−[N≡O]+ makes a considerable contribution to the stationary state. This type of resonance, already deduced from a discussion of bond distances, is thus confirmed.The dielectric constant of the pure liquid was found to be ϵ = 18.2 at 12° for NOCl and ϵ = 13.4 at 15.2° for NOBr, respectively.
“Associated” mixtures. II
Authors: van Santen J. H. 
Published: September 2010

AbstractThe shift of the absorption band of diethyl ether at 8.9 μ upon mixing with chloroform and several related compounds was measured.The measured shifts can, like several frequency changes mentioned in the literature, be calculated with a plausible distribution of charge of the molecules concerned.From the measurements conclusions are drawn about the charge of the hydrogen atom in the compounds investigated.
On the influence of electrolytic copper on the oxidation of aromatic free mineral oil
Authors: Kreulen D. J. W. 
Published: September 2010

AbstractThe influence of copper on the oxidation of an aromatic free mineral oil is investigated. The reaction is catalyzed by solid as well as by dissolved copper. Copper oxide was also found to be a catalyst.Using quantities of solid copper up to 10 g/250 cm3 of oil, however, the catalytic effect is so slight that it falls within the experimental error.Copper, and also CuO, affects the length of the period of induction. With increasing quantities of copper the length of the period of induction first decreases (adsorption of antioxidants from the oil), but with still larger quantities this decrease turns into an increase (breaking of reaction chains).The phenomena observed are discussed in connection with the study of the mechanism of oil oxidation.
Des Quinoléines Substituées. I: Synthèse des 2. et 3. (α‐quinoléyl)‐phénanthrènes
Authors: Buu‐Hoï Ng. Ph. , Cagniant P. 
Published: September 2010

AbstractOn décrit dans le présent mémoire la préparation et les principales propriétés de 2 phénanthrènes substituées par le radical quinoléïqe.
Der Dampfdruck des Jodcyans
Authors: Ketelaar J. A. A. , Kruyer S. 
Published: September 2010

AbstractEs wurde der Dampfdruck des Jodcyans im Temperaturgebiet 64°‐153° gemessen. Es ergab sich für den Dampfdruck der festen Phase: \documentclass{article}\pagestyle{empty}\begin{document}\[{\rm log \rho }_{{\rm mm}} = - \frac{{14310}}{{4.574}} + 10.46\]\end{document} für die flüssige Phase \documentclass{article}\pagestyle{empty}\begin{document}\[{\rm log \rho }_{{\rm mm}}= - \frac{{9560}}{{4.574T}} + 7.77\]\end{document}. Der Tripelpunkt wurde zu t = 146°. p = 993 mm Hg bestimmt. Sublimationswärme: 14.31 ± 0.04 kcal/Mol. Verdampfungswärme : 9.56 ± 0.08 kcal/Mol, Schmelzwärme : 4.75 ± 0.09 kcal/Mol.
Über das Addukt von β‐Elaeostearinsäure und Maleinsäureanhydrid
Authors: Rinkes J. 
Published: September 2010

AbstractEs glückte mir, das Addukt von β‐Elaeostearinsäure und Maleinsäureanhydrid zu einem bekannten Benzenderivat, Terepthalsäure, abzubrechen und auch das Zwischenprodukt 1‐Hexyl‐4‐heptylbenzen mit einem synthetisch hergestellten Produkt zu identifizieren.
Untersuchungen über Wolframhalogenide. 2. Mitteilung). Dampfdrücke von Wolframhexachlorid
Authors: Ketelaar J. A. A. , v. Oosterhout G. W. , Braun P. B. 
Published: September 2010

AbstractEs wird eine Reinigungsmethode zur Darstellung von reinem Wolframhexachlorid ausgearbeitet welche in einigen wichtigen Punkten, in denen die Dissoziation berücksichtigt wird, von den üblichen Verfahren abweicht. Von dem so erhaltenen reinsten WCl6 wurden die Dampfdrücke im Temperaturgebiet 150°‐360°C bestimmt. Die Dampfdrücke folgen sehr gut den Formeln:magnified imageEs ergab sich für die Sublimationswärme der sogenannten α‐bzw. der Hochtemperatur oder β‐Modifikation 20.94 bzw. 17.54 kcal/mol; für die Verdampfungswärme der Schmelze wurden 15.24 kcal/mol gefunden. Hieraus ergibt sich für die Umwandlungswärme 3.4 und für die Schmelzwärme 2.3 kcal/mol. Die Umwandlungswärme beträgt also etwa das Anderthalbfache der Schmelzwärme. Zur genaueren Festlegung des Umwandlungspunktes und des Tripelpunktes wurden Aufwärmungskurven aufgenommen. Daraus ergab sich für den Umwandlungspunkt 226.93 ± 0.03°C und für den Tripelpunkt 284.0 ± 0.1°C; ausserdem ein bisher unbekannter Umwandlungspunkt, bei 167.9‐169.5°C Hierfür sind auch andere Anzeigen vorhanden. Der Siedepunkt berechnet sich zu 336.5°C; der Troutonsche Konstante zu 24.9 cal/Grad. An Präparaten mit einer von dem stoechiometrischen Verhältnis abweichenden Zusammensetzung wurde eine merkwürdige Anomalie des Dampfdruckes in der Umgebung des Umwandlungspunktes gefunden, deren Erklärung in Zusammenhang mit der hier auftretenden Strukturänderung gebracht wird.
On the three‐phase pressures for solid salt‐solution‐vapour II
Authors: Korvezee A. E. , Dingemans P. 
Published: September 2010

AbstractIn the previous paperMiss A. E. Korvezee and P. Dingemans, Rec. trav. chim. 62, 625 (1943).
) we showed that the relative vapour pressure of saturated salt solutions (i.e. the vapour pressure of the solution divided by the vapour pressure of water at the same temperature), plotted as a function of the temperature, is in many cases a straight or only very slightly curved line.When a salt occurs in two crystalline forms which are converted into each other at a definite temperature, the p‐T curve of the saturated solutions will possess two maxima (stable or metastable), and there are three different types of curve possible. An example of each type has been exhaustively studied in this laboratory. By making use of all the vapour pressures measured over a wide temperature range, the equations of the relative vapour pressure curves are given for these saturated solutions. With the help of these equations the position of the maxima in the p‐T curves can be accurately determined.From the difference in the slope of the relative vapour pressure curves at the transition point, the heat of transition between the two modifications of the salt can be calculated. This heat effect can also be calculated as the difference in heat of crystallization of the two salt modifications at the temperatures of the maxima.
Polymerization with atomic hydrogen
Authors: Houtman J. P. W. , van den Berg K. , Heertjes P. M. 
Published: September 2010

AbstractThe activity of atomic hydrogen as a polymerization agent for unsaturated organic compounds has been investigated. Two methods were used to prepare pure atomic hydrogen. The first was a modified Langmuir method, passing hydrogen over a glowing tungsten wire, and removing the hydrogen ions formed. The second was Cario and Frank's method, by which atomic hydrogen is prepared by means of ultraviolet light. It could be shown that atomic hydrogen causes polymerization as well as hydrogenation of unsaturated organic compounds.
Order‐disorder transformations in the lattice of organic molecules. II. The crystal structure of C(SCH3)4 below 23.2°C
Authors: Perdok W. G. , Terpstra P. 
Published: September 2010

AbstractIn this article the X‐ray investigation of tetramethylorthothiocarbonate C(SCH3)4 is described, a compound of particular interest with regard to its physical properties1). The modification stable below 23.2°C proved to be tetragonal, space group P421c (D2d4) Z = 2, a = 8.536 Å, c = 6.949 Å.A Bragg synthesis showed that the molecule C(SCH3)4 is built tetrahedrally with C ‐ S = 1.81 Å. The structure can be simply described as a packing of methyl groups (r = 2 Å) arranged in a pattern resembling a body‐centred lattice, the interstices of which are alternately empty, or filled with a CS4 group.
Des Quinoléines Substituées. III. Quinoléines 2‐substituées dérivées du fluoranthène et du thionaphtène
Authors: Buu‐Hoï Ng. Ph. , Cagniant Paul 
Published: September 2010

AbstractLes auteurs décrivent la synthèse de nouvelles 2‐arylquinoléines dérivées du fluoranthène et du thionaphtène, et, à cette occasion, signalent de nouveaux résultats concernant la chimie de ces 2 carbures aromatiques.
Sur la Couleur et la Constitution de Quelques Dérivés Benzéniques Aminés. II
Authors: Heertjes P. M. , van Kerkhof J. C. , de Vries K. A. 
Published: September 2010

AbstractLe mémoire donne quelques règles sur l'influence du groupe diméthylamino, introduit dans le triphénylméthane et son carbinol, sur le spectre d'absorption. Ces règles et le comportement spectroscopique des composés mentionnés dans des solutions aqueuses acides, conduisent à la conclusion, que dans le changement de constitution qui a lieu lors de la formation des colorants basiques du triphénylméthane, l'atome C central, un groupe basique et le noyau phénylique qui porte ce groupe jouent un rôle.
The AZO chromophor(X)
Authors: Blumberger J. S. Petrus 
Published: September 2010

AbstractThe ionization constant of 24 azo dye cations of the type: benzene‐azo‐1‐amino‐naphthalene‐6,8‐disulphonic acid: magnified imagewas determined at five temperatures from 40 to 80°C.The heat of ionization can be influenced by substitution in the diazo component, but there is only a very limited correlation to be found with the influence of the substituent in question on the colour. Within the limits of accuracy of the method this heat of ionization is in most cases insensitive to temperature, which could also be deduced from the “isoelectric” character of the equilibrium.Strong ortho effects can be explained by chelate binding, while colouristic deviations of vicinally substituted diazo components could also be detected in the case of these aminoazo dyes.
Researches on adsorption electrodes V. Glass electrode, ion exchange and electrode properties
Authors: Tendeloo H. J. C. , Voorspuij A. J. Zwart 
Published: September 2010

AbstractThe incorporation of Al2O3 in a network of SiO4 tetrahedra has a marked influence on the electrode properties of a glass.From theoretical considerations it follows, as could be proved experimentally in this paper, that the exchange capacity and the hydration is less for a glass containing Al2O3 than for Corning glass 015, which does not contain Al2O3.
The crystal structure of chalcopyrite (CuFeS2) and AgFeS2: The permutoidic reactions KFeS2 → CuFeS2 and KFeS2 → AgFeS2
Authors: Boon J. W. 
Published: September 2010

AbstractNew evidence has been given that chalcopyrite (CuFeS2) has a crystal structure according to Pauling and Brockway3)and not according to Burdick and Ellis 2) : in a rotation diagram taken with CoK radiation of a cylindrical chalcopyrite crystal around the [001] axis weak interzones can be seen which are only compatible with the Pauling‐Brockway structure (see fig. 2).AgFeS2 prepared by pseudomorphic transformation of KFeS2 in a AgNO3 solution has the same structure as chalcopyrite. The cell constants are a = b = 5.66 Å and c = 10.30 Å. The space group is also D122d‐142d with 4 molecules of AgFeS2 per cell. The atomic positions are the same as those given for chalcopyrite by Pauling and Brockway, with a parameter value x8 of about 1/4. The “chain” direction (i.e. the [001] direction of the KFeS2 crystal from which the AgFeS2 crystal was prepared) is [100]. The fact that AgFeS2 may be considered as having originated from CuFeS2 by isomorphic substitution is new, almost superfluous evidence that chalcopyrite has the Pauling‐Brockway structure.The artificial CuFeS2, prepared by pseudomorphic transformation of KFeS2, has a crystal structure showing great similarity to the structure of chalcopyrite, but from the X‐ray diagram it is impossible to deduce whether this similarity is also valid for the details. From the fact that AgFeS2 is isomorphic with chalcopyrite it follows that the artificial CuFeS2.will probably have the same Pauling‐Brockway structure as chalcopyrite, and that here also the “chain” direction will be [100].Finally the permutoidic reactions KFeS2 → AgFeS2 and KFeS2 → CuFeS2 are discussed.
Über die Struktur und Disproportionierung einiger 2‐(Halogenphenyl)Pyrroline
Authors: Dhont J. , Wibaut J. P. 
Published: September 2010

AbstractGezeigt wird, dass das durch Reduktion des 2‐(4‐Chlorphenyl)‐pyrrols mit Zink und Salzsäure erhaltene Pyrrolin das 2‐(4‐Chlorphenyl)‐2,3‐dihydropyrrol ist. Nach Analogie wird für das 2‐(3‐Chorphenyl)‐ das 2‐(2‐Chlorphenyl)‐ und das 2‐(3‐Bromphenyl)‐pyrrolin dieselbe Struktur angenommen. Diese Pyrroline unterliegen alle einer Disproportionierung, wobei das entsprechende Pyrrol‐ und Pyrrolidinderivat gebildet wird.
Synthetic lubricating oil fractions from ethene and gases containing ethene by polymerization II
Authors: Heertjes P. M. , Hessels W. J. , Waterman H. I. 
Published: September 2010

AbstractThe lubricating properties of the synthetic lubricating oil prepared as described in the first communication were tested in a standard engine under very drastic conditions (ring sticking test). The lubricating properties of the oil in general were very good.The cetane number of the middle oil obtained by polymerization of ethene was 32.The use of a liquid diluent in the catalytic polymerization of ethene is not essential.Besides nickel or nickel alloys, other compounds such especially as cobalt and also aluminium, and to a certain extent also dry hydrochloric acid can exercise a favourable influence on the polymerization of ethene with aluminium chloride.
L'acide Disulfoadipique
Authors: van der Zanden J. M. 
Published: September 2010

AbstractPoursuivant les recherches concernant l'action de l'anhydride sulfurique sur les acides bibasiques, nous avons étudié la sulfonation directe de l'acide adipique ainsi que l'acide disulfonique préparé en partant de l'acide dibromoadipique.
Some remarks about the connection between the constitution and dipole moment of some indole derivatives
Authors: Janetzky E. F. J. , Lebret M. C. 
Published: September 2010

AbstractIn the preparation of indoles substituted in the pyrrole nucleus starting from α‐arylaminoketones, two types of indoles may be obtained according as they are formed by ring closure or by rearrangement. The dipole moment of a number of indoles whose constitution had been definitely determined by other methods was measured. It was found that in some cases it is possible to distinguish between the two ways of indole formation by means of the dipole moment.
A simple synthesis of isopelletierine: Research on the synthesis of compounds from the group of alkaloids from Punica Granatum 3rd communication
Authors: Wibaut J. P. , Kloppenburg C. C. , Beets M. G. J. 
Published: September 2010

AbstractBy the action of acetic anhydride on lithium picolyl 1‐(2‐pyridyl)‐propanon‐2 is prepared; by partial reduction of this compound 1‐(2‐piperidyl)‐propanon‐2 or dl‐isopelletierine is obtained.
The preparation of pyridine‐4‐carboxylic acid and of piperidine‐4‐carboxylic acid by catalytic reduction of 2,6‐dichloropyridine‐4‐carboxylic acid
Authors: Wibaut J. P. 
Published: September 2010

Abstract2,6‐Dichloropyridine‐4‐carboxylic acid (II) is converted by catalytic reduction with nickel in alkaline medium into pyridine‐carboxylic acid (III). If the catalytic reduction ofIIis carried out in glacial acetic acid and with platinum (Adams) as a catalyst, piperidine‐4‐carboxylic acid (IV) is formed in one operation which substance is also obtained by the catalytic reduction ofisonicotinic acid under the same circumstances.2,6‐Dichloro‐4‐cyanopyridine (V) was treated under varying conditions with hydrogen in the presence of catalysts; in these experiments the substance V was recovered unchanged.
The vulcanization of rubber with phenol formaldehyde derivatives
Authors: van der Meer S. 
Published: September 2010

AbstractAfter some remarks on the importance of phenol formaldehyde resins as vulcanizing agents for rubber, the introductory investigations which led to the methylene quinone theory of the vulcanization are described. Finally this theory is illustrated with the compound 2.6‐di‐bromomethyl‐4‐methylphenol as an example.