bluuebunny/crossref_metadata_2025_split huggingface dataset:
Massenspektren organischer Verbindungen. 2. Mitteilung. Cyclohexanone
Authors: Seibl Josef , Gäumann Tino 
Published: December 2004

AbstractThe mass spectra of cyclohexanone, the mono‐ and dimethylcyclohexanones, 2,4,6‐ and 3,4,5‐trimethylcyclohexanone and their 2,6‐deuterated analogs are presented. In addition 3,5‐d4‐ and 4‐d2‐cyclohexanone, 3,5‐d4‐ and 4‐d2‐2‐methyl‐cyclohexanone and 2‐(d3‐methyl)‐cyclohexanone are synthesized and their mass spectra determined. High resolution techniques and labelling with 18O are employed to differentiate between oxygen containing fragments and those consisting of C and H only in the spectra of all nondeuterated and some of the deuterated compounds. The fragmentation of these ketones under electron impact is discussed in detail in terms of breakdown mechanisms. Appearance potentials of the principal fragments of cyclohexanone are determined.
Die Cardenolide der Samen von Mallotus philippinensis (LAM.) MÜLL.‐ARG. (= Rottlera tinctoria ROXB.). Glykoside und Aglykone, 252. Mitteilung
Authors: Roberts K. D. , Weiss Ek. , Reichstein T. 
Published: December 2004

AbstractThe seeds of Mallotus philippinensis (Lam.) Muell.‐Arg. were found to contain 4 cardenolides (A, B, C and D) after fermentation. Two new glycosides, C and D, were obtained in crystalline form and were shwon to be corotoxigenin‐rhamnoside and coroglaucigenin‐rhamnoside respectively. The minor constituents A and B were identified as corotoxigenin and coroglaucigenin after paper chromatography.
Einfluss langfristiger Oxytetracyclin‐Fütterung auf den Lipidgehalt und die Fettsäurezusammensetzung der Ratte
Authors: Ritzel Günther , Wagner Heribert 
Published: December 2004

AbstractFeeding Oxytetracycline in high doses to rats for 26 months results in a distinctly elevated body weight. This increase depends on enhanced endogenous synthesis of triglycerides. Furthermore the organs are enlarged by tissue formation.
Contribution à l'analyse des chromates du ciment
Authors: Brun R. 
Published: December 2004

AbstractIl est démontré que le ciment contient beaucoup plus de chrome hexavalent qu'on ne le pensait jusqu'à présent. En effet, l'analyse classique basée sur une extraction à l'eau ne permet de doser qu'une partie des chromates (chromates «libres»); en plus de ceux‐ci le ciment contient une proportion variable et importante (2 à 20 fois plus) de chromates adsorbés, que l'on peut éluer an moyen de sulfate de sodium à 20%. Les résultats de l'analyse de 29 échantillons de ciment par la nouvelle méthode et la méthode classique sont donnés.
Recherches sur la formation et la transformation des esters IL. Sur la préparation de monoesters phosphoreux d'amino‐alcools et d'alcools supérieurs, et sur leur vitesse de scission à différents pH
Authors: Cherbuliez Emile , Čolak‐Antić Sl. , Weber G. , Rabinowitz J. 
Published: December 2004

AbstractPhosphorous monoesters of amino alcohols are obtained by heating equimolecular amounts of phosphorous acid and the corresponding amino alcohol at 150–200°, under reduced pressure.
Sur la séparation des terres rares XI. Systèmes de solubilité binaires et ternaires comprenant des nitrates des terres cériques
Authors: Brunisholz G. , Quinche J. P. , Kalo Abdel Magid 
Published: December 2004

AbstractThe solubility polytherms of the binary systems R(NO3)3‐H2O (R = La, Ce, Pr, Nd and Sm) have been established between 0° and 50°. The nitrate hexahydrates of lanthanum and cerium are not isotypic with the corresponding salts of the other membres of the rare earth group. This fact is responsible for the solubility anomaly already discovered by QUILL and ROBEY(Ce(NO3)3,6H2O is the most soluble salt of series) and for the miscibility gap occurring in the solid phases of the systems comprising the two types of the rare earth nitrate hexahydrates. Five ternary systems have been investigated at various temperatures, using a new technique which yields homogeneous mixed cristals.
Méthode de dosage ampérométrique rapide de submicro‐, micro‐et macro‐quantités de calcium et de magnésium en présence l'un de l'autre
Authors: Monnier D. , Rouèche A. 
Published: December 2004

AbstractUne méthode de dosage ampérométrique du calcium et du magnésium, en présence l'un de l'autre, est proposée. Le calcium est titré par une solution d'EGTA, puis le magnesium, par une solution d'EDTA. Un circuit ampérométrique (E =0,02 V) permet de déterminer les points équivalents, grâce au fait qu'un courant anodique provenant de l'oxydation du mercure se produit en présence d'un excits resp. d'EGTA et d'EDTA. Par cette méthode il est possible de doser avec une bonne précision jusqu' á 0,01,μg/ml de magnésium en présence de 0,01 mg/ml de calcium et 0,01 μ/ml de calcium en présence de 0,01 mg/ml de magnésium. Une étude statistique de la précision et de l'exactitude de la méthode pour diverses concentrations de ces éléments a été faite. La sélectivité de la méthode a été étudiée et des courbes de polarisation ont été établies. Cette méthode est applicable au dosage Ca‐Mg dans le sérum, l'urine, les eaux et divers autres échantillons.
Organische Phosphorverbindungen. XI. Arylierung von PSCl3 in Gegenwart von Friedel‐Crafts‐Aktivatoren. Ein neues Verfahren zur Darstellung von Thiophosphoäure‐dihalogeniden, Thiophosphinsäurehalogeniden und tertiären Phosphinsulfiden
Authors: Maier Ludwig 
Published: December 2004

AbstractThe reaction of benzene, toluene, chlorobcnzene, trimethoxybenzene, hexyl‐ toluene, methyl p‐anisate, thiophene, and furfurol with thiophosphorus trihalides, thiophosphonic dichlorides and thiophosphinic chlorides in the presence of FRIEDEL CRAFTS activators has been studied. The preparation of thiophosphonic dihalides, RPSX2, (R=C6H5, ClC6H4, FC6H4, CH3, C6H4; X=C1, Br), thiophosphinic halides, RR′PSCl (R, R′ =C6H5, ClC6H4, FC6H4, CH3C6H4, C6H13, C6H3CH3; R =C6H5, R′=CH,; X = C1, Br), as well as of tertiary phosphine sulfides, RR′R″S (R, R′R″= C6H5, ClC6H4, CH3C6H4, C6H13, C6H3CH3; R =CH3, R′R″=C6H5, and R =CH3, R′=C2H5, R″=C6H6) is described. Some reactions of tertiary phosphine sulfides are also reported.
Die Solvolyse von α‐Bromstyrolen Substitution am ungesättigten trigonalen Kohlenstoffatom
Authors: Grob C. A. , Cseh G. 
Published: December 2004

AbstractIn ‘80%’ ethanol the or‐bromostyrenes 5a‐5d undergo unimolecular solvolysis to the corresponding acetophenones. In addition to acetophenone, α‐bromostyrene itself yields a minor amount of phenylacetylene. The p‐amino, p‐methoxy and p‐ acetamido derivatives 5b‐5c react 108, 104 and 103 times as fast, respectively, as the unsubstituted compound 5a, the rates being insensitive to 1‐5 equivalents of triethyl‐ amine. Furthermore, 5a and 5c show electrophilic catalysis by silver ion. A two‐step ionisation mechanism involving a digonal carbonium ion (p‐R‐C6H4C=CH2)+ is thus indicated.
Die Acidität des Hydrogensulfidions HS−
Authors: Widmer M. , Schwarzenbach G. 
Published: December 2004

AbstractThe acidity of the HS− anion is considerably smaller than had been concluded in the extensive investigations of 1946 to 1950. The results obtained 40 years earlier are much nearer the truth. The two pK values of H, S in 1MKC1 and at 20°C are 6,88 ± 0,02 and 14,15 ±0,05.
Sur la structure des terpénylphénols obtenus en condensant le camphène avec le phénol, et celle de leurs dérivés hydrogénés à odeur boisée
Authors: Demole Edouard 
Published: December 2004

AbstractThe mixture obtained from the well‐known BF3‐catalyzed condensation of camphene and phenol contains at least nine terpeno‐phenols. The major components are o‐ (p‐) (2,2, exo‐3‐trimethyl‐exo‐5‐norbornyl)‐phenols, accompanied by some o‐ (p‐) (exo‐2‐borny1)‐phenols and smaller amounts of o‐ (p‐) (1,3,3‐trimethyl‐exo‐6‐norborny1)‐ phenols. Further, very small amounts (>1%) of the three corresponding meta‐substituted phenols also occur in the condensation mixture. On catalytic hydrogenation, these m‐isomers lead to 3‐terpenyl‐cyclohexanols characterized by a powerful odour of sandalwood. Most surprisingly, the 2‐ and 4‐terpenyl‐cyclo‐hexanols obtained in the same way from the o‐ and p‐terpenyl‐phenols are almost odourless. The sandalwood odour appears, therefore, to be highly characteristic of the 3‐substituted cyclohexanols, and this fact has been conclusively verified by the unambiguous synthesis of the axial and equatorial epimers of 3‐(2,2, exo‐3‐trimethyl‐exo‐5‐norbornyl)‐cyclohexanol.
Aminométhoxypyridines er sulfanilanides correspondants
Authors: Urban R. , Schnider O. 
Published: December 2004

AbstractEs wurde eine Anzahl im Pyridinkern substituierter 2‐, 3‐ und 4‐Sulfanilamidopyridine dargestellt, insbesondere alle noch unbekannten Monomethoxy‐Derivate. Die Herstellung der als Ausgangsprodukte dienenden Aminopyridine, soweit sie neu sind, wird beschrieben.
Odeur et constitution XXII. Les cis‐ et trans‐p‐menthènes‐8
Authors: Thomas Alan F. , Stoll M. 
Published: December 2004

AbstractPure cis‐ and trans‐p‐menth‐8‐ene are described. Only trans‐P‐menth‐8‐ene possesses the orange odour of limonene.
Etude de l'évolution du propanal et du butanal en milieu aqueux alcalin à température peu élevée
Authors: Blanc Pierre‐Yves , Perret Adrien , Teppa Franco 
Published: December 2004

AbstractLa réaction fondamentale qui caractérise l'évolution du propanal et celle du butanal sous l'action de solutions aqueuses alcalines à 80‐100°est l'allongement de chaîne par aldolisations linéaires, mettant successivement à contribution jusqu'à quatre molécules d'aldéhyde initial. Les composés formés subissent en grande partie, au cours de la réaction, une déshydratation plus ou moins complète qui porte d'abord sur l'hydroxyle le plus rapprochée de la fonction carbonyle.
Strahlungschemie der Kohlenwasserstoffe. 12. Mitteilung. Benzol‐Toluol und deuterierte Verbindungen
Authors: Hoigne Jürg , Gäumann Tino 
Published: December 2004

AbstractFurther information on the radiation chemistry of aromatic liquids has been obtained by a detailed analysis applied mainly to the dimeric products formed by the gamma irradiation of mixtures of benzeneltoluene and their deutero‐compounds (benzene‐d6toluene‐d0 and benzene‐d0/toluene‐α‐d3). The diphenylmethane‐type of molecules are not formed by a reaction of dehydroaromatic species (benzyne). The different products are generally produced according the expected mixture law when corrections for the competing chemical reactions are allowed for. In the perdeutero‐benzenel/toluene system however an energy transfer from benzene‐d6, to toluene must be postulated to explain the yields obtained. The isomer distribution of the three phenyltoluenes can be compared with the statistical values.
Versuche zur Berechnung Kinetischer Isotopeneffekte I: Eine einfache Methode zur Berechnung der Schwingungsfrequenzen von Molekeln und Übergangszuständen und ihre Anwendung auf die Ionen H3O+ und D3O+ als Beispiele
Authors: Willi A. V. 
Published: December 2004

AbstractFor a theoretical estimation of kinetic isotope effects, vibration frequencies of initial and transition states must be known. A simple method is developed for the calculation of vibration frequencies of polyatomic particles with the aid of an electronic digital computer. The problem is formulated in terms of Cartesian displacement coordinates. After a few transformations, a symmetrical matrix is obtained whose eigenvalues may readily be calculated by application of a special iterative program. Factoring of the matrix in a preceding step can thus be avoided. The method is applied for the calculation of the vibration frequencies of the ions H3O+ and D3O+ as examples.
Versuche zur Berechnung kinetischer Isotopeneffekte II: Ein Vierzentren‐Modell des Übergangszutandes für die säurekatalytische Wasser‐Addition an Olefine
Authors: Willi A. V. 
Published: December 2004

AbstractThe method of the preceding paper is applied to the transition state of the acid catalyzed olefin hydration. From different sets of force constants, vibration frequencies and partition function ratios are computed for a cyclic four center modelcomposed of olefin + H+·OH2 or olefin +D+·OD2. Tunneling corrections are calculated with the aid of BELL'S formula. A semiempirical value is used for QD3O/QH3O. It is shown that for the four center transition state the isotope effect kH/kD may be in the order of 1.1–1.6.
Nouvelle méthode spectrofluorimétrique de dosage de traces de bore
Authors: Marcantonatos M. , Monnier D. , Marcantonatos A. 
Published: December 2004

AbstractUne nouvelle méthode fluorimétrique, permettant de doser 0,03 à 2,1 μg de bore, a été mise au point. Elle est basée sur les propriétés fluorescentes du complexe boreacide (o‐arsénophénylazo)‐1 ‐hydroxy‐2‐naphtalène‐disulfonique‐3,6 (APANS), dont la formation a lieu en milieu acide sulfurique concentré ou peu dilué. Les valeurs des blancs et des résultats sont en général trés reproductibles. La précision est de ±12 % pour 0,03 μg, ±5% pour 0,21 μg et de ± 1,2% pour 2,1 μg de bore.
Verteilung von markierten Molekeln in Kristallsuspensionen als analytisch und präparativ ausnutzbare Methode der Tracerchemie: Untersuchungen mit 14C‐markierten Aminosäuren
Authors: Schneider C. H. 
Published: December 2004

AbstractThe partition between solution and solid phase of several 14C‐labeled amino acids initially present in tracer amounts in the solution phase of stirred suspensions of crystalline amino acids was studied. The partitions examined were stereospecific since the labeled L‐amino acid molecules were readily taken up from the solution phase by the corresponding L‐crystals whereas the isomeric D‐CryStdS incorporated the labeled L‐molecules at a reduced rate (as exemplified by alanine and serine) or did not incorporate labeled L‐molecules at all. If a sufficiently large excess of crystalline phase as compared to the amount of solute is employed and if incorporation takes place the radioactivity in solution decreases to a small and practically constant fraction of its initial value. The incorporation of various labeled L‐amino acids into a crystalline L‐leucine phase was also studied. The rate of uptake was characteristic for each amino acid. The partition experiments can be performed easily and may be used for analytical and preparative purposes. From studies of leucine and tyrosine systems it is concluded that the partitions observed depend on dissolution and crystallisation processes coupled with crystal fragments which are present or formed during the stirring in the crystal suspension.
Metallionen‐Katalyse bei der Autoxydation cytostatischer Stoffe II
Authors: Erlenmeyer H. , Zell R. , Brintzinger H. , Prijs B. 
Published: December 2004

AbstractFurther investigations of autoxidative H2O2, formation with a disubstituted hydrazine derivative show that Mn2+ and its sulfophtalocyanine complex are exceptionally effective catalysts in this reaction.
Über 1:2‐Chrom (III)‐Komplexe vom Sandwich‐Typus aus der Anthranilsäure → Pyrazolon‐Reihe
Authors: Schetty G. 
Published: December 2004

AbstractMonoazofarbstoffe der Zusammensetzung Anthranilsaure →Phenyl‐methyl‐py‐ razolon ergeben überwiegend 1:2 Z‐CrIII‐Komplexe vom DREW‐PFITZNER‐TYPUS.1st jedoch der Anthranilsäurerest in o‐Stellung zur Carboxyl‐ oder Azogruppe mit einer nukleophilen Gruppe substituiert, werden isomere 1:2‐CrIII‐Komplexe vom Sand‐ wich‐Typus gebildet. Die untersuchten Komplexe lassen Zusammenhänge zwischen Absorptionsspektren und Koordinationsart erkennen.
Löslichkeitsprodukte von Metalloxiden und ‐hydroxiden. 9. Mitteilung. Löslichkeitsprodukte und Freie Bildungsenthalpien von Zinkoxid, amorphem Zinkhydroxid, β11‐,β2‐, γ‐, δ‐ und ϵ‐Zinkhydroxid
Authors: Schindler P. , Althaus H. , Feitknecht W. 
Published: December 2004

AbstractThe solubility of zinc hydroxides and zinc oxide was investigated by determining [Zn2+] and [H+] of solutions in contact with the solid phases. [H+]was measured by the EMF‐method at the constant ionic strength 0,2 (K)NO3 (or (Na)ClO4) while [Zn2+] was calculated from analytical data. The relative stabilities 01 the solid phases are discussed in terms of free enthalpies of formation which were calculated from the solubility constants by means of a simple cycle. For data see table 3.
Un nouveau type de réarrangement de SMILES: 1a transformation du N‐p‐nitrophénoxy‐carbonyl‐hydrazobenzène en N‐p‐nitrophényl‐hydrazobenzène
Authors: Baudet P. , Calin M. , Cherbuliez E. 
Published: December 2004

AbstractEn présence d'une base, le N‐p‐nitrophénoxycarbony1‐hydrazobenzène subit une transposition en N‐p‐nitrophényl‐hydrazobenzène avec Climination de CO,. Cette transformation présente une grande analogie avec le réarrangement de SMILES, dont le OH‐ schéma est \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm HY} - {\rm C} - {\rm C} - {\rm X} - {\rm Ar}{\rm Ar Y} - {\rm C} - {\rm C} - {\rm X H(X = O, SO}_{\rm 2},{\rm SO, S; Y = } - {\rm OH, } - {\rm SH, } - {\rm NHR, } - {\rm CONHR)} $\end{document}. Dans notre cas, × = 0 et HYC est remplacé par NH(C, H5)‐N.
Additionen von Organometallverbindungen an die CN‐Bindung
Authors: Marxer A. , Horvath M. 
Published: December 2004

AbstractThe addition of organometallic compounds to SCHIFF bases, hydrazones, and oximes was studied. It is shown that, contrary to statements in the literature, hydra‐zones and oximes may give rise to the same type of C‐alkylation and C‐arylation as already known for SCHIFF bases.
Podophyllum‐Lignane 4′‐Demethyl‐desoxypodopyllotoxin‐β‐D‐glucosid, ein neues Glykosid aus Podophyllum emodi WALL. und P. Peltatum L. 16. Mitteilung über mitosehemmende Naturstoffe [1]
Authors: von wartburg A. , Kuhn M. , Lichti H. 
Published: December 2004

AbstractThe isolation of lignan H (C27H30O12), a new glycoside from the roots and rhizomes of Indian Podophyllurn emodi WALL. and American P. peltatum L., is described. Its structure as 4′‐demethyl‐desoxypodophyllotoxin‐β‐D‐glucoside (I) has been deduced by the n.m.r. spectrum of its tetraacetate (II) and confirmed by acid hydrolysis to 4′‐demethyl‐desoxypodophyllotoxin (III) and D‐glucose.
Über Pyrrolizidinchemie 5. Mitteilung [1] Konfiǵurationsermittlung von hydrierten Pyrrolo[2,1‐a]isoindolen durch Protonenresonanz‐Spektroskopie
Authors: von Philipsborn W. , Mondelli R. , Viscontini M. 
Published: December 2004

AbstractEs werden die Protonenresonanz‐Spektren von zwei Dihydro‐ und vier Tetrahydro‐Derivaten des 2,5‐Dioxo‐3‐phenyl‐2,3‐dihydro‐5H‐pyrrolo [2, 1] ‐isoindol‐1 ‐carbonsäure‐äthylesters analysiert und die relativen Konfigurationen dieser Verbindungen abgeleitet.
Über das Problem der Ähnlichkeit in der Chemie Über spezifisch adsorbierende Silikagele II [1]
Authors: Erlenmeyer H. , Bartels H. 
Published: December 2004

AbstractFurther evidence is given for the applicability of the information theory to the problem of specific adsorption on «printed» gels. Relative informations are calculated for different substances from measurements of specific adsorption.
Synthèse d'analogues structuraux de l'élédoïsine (3ème partie)
Authors: Sandrin Ed. , Boissonnas R. A. 
Published: December 2004

AbstractThe syntheses of a large number of Eledoisin analogues, some of which possess a more potent depressor effect than the original peptide, are described. Whereas the C‐terminal moiety of the Eledoisin molecule seems to be responsible for its biological action, its N‐terminal moiety can be deeply modified or even left out without considerable decrease of activity. There is apparently no relation between the isoelectric points of these analogous peptides and their biological properties.
Photochemische Reaktionen 29. Mitteilung [1] Zum Mechanismus der photochemischen Umlagerung von 3‐Oxo‐4,5‐oxido‐Steroiden (Vorläufige Mitteilung)
Authors: Wehrli H. , Lehmann C. , Schaffner K. , Jeger O. 
Published: December 2004

Abstract3‐Oxo‐4,5‐oxido‐10β‐steroids have previously been shown to rearrange photolytically to the corresponding 3,5‐dioxo‐10(5 → 4)‐abeo compounds (cf. a, b → c). According to the present findings, the 10α‐testosterone oxide 4 gives specifically the l0α‐product 5 and the stereoisomeric 4‐methyl‐testosterone oxides 8 and 10 undergo stereospecific rearrangements to the products 11 and 12 respectively.
Einfluss der γ‐Verzweigung auf Solvolysegeschwindigkeit und Fragmentierung von Alkyl‐ und Cycloalkyl‐Halogeniden und ‐Arylsulfonaten. Fragmentierungsreaktionen, 8. Mitteilung
Authors: Grob C. A. , Schwarz W. , Fischer H. P. 
Published: December 2004

AbstractIn an investigation on the effect of branching in the γ‐position of alkyl and cycloalkyl halides and arylsulfonates the solvolysis rates and products of cis‐ and trans‐3,3,5‐trimethylcyclohexyl tosylate (18) and (19), 1‐bromo‐ and 1‐bromo‐3,3‐dimethyl‐bicyclo[2.2.2]octane (20a and b), 1‐bromo‐adamantane (21a) and its 3‐methyl, 3‐ethyl, 3‐isopropyl and 3,5,7‐trimethyl derivatives (21b, c, d) and (22), respectively, have been determined.
Organische Phosphorverbindungen XIII. Über einige Reaktionen des Methylthiophosphonsäure‐dibromids CH3P(S)Br2 und verwandter Verbindungen [1]
Authors: Maier Ludwig 
Published: December 2004

AbstractSeveral insecticides containing a P‐C bond have been prepared. The physical properties and the insecticidal activity of these compounds are reported. The structure of phosphinothionic anhydrides has been elucidated.
Die solvoltische Decarboxylierung von α, β‐ungesättigeten β‐Halogensäuren Fragmentierungsreaktionen, 9. Miteilung
Authors: Grob C. A. , Csapilla J. , Cseh G. 
Published: December 2004

AbstractPotassium salts of cis and trans α,β‐unsaturated β‐halo acids undergo decarboxylation when heated in aqueous solution. Salts of the cis series yield acetylene derivatives, whereas those of the trans series afford ketones in addition to acetylene derivatives.
Recherches sur la formation et la transformation de esters LII [1] Monoesters phosphoreux de divers types d'alcools
Authors: Cherbuliez Emile , Hunkeler F. , Weber G. , Rabinowitz J. 
Published: December 2004

AbstractMenthol, unsaturated alcohols, and cyano alcohols are very easily esterified by phosphorous acid and yield the corresponding phosphorous monoesters.
Recherches sur la formation et la transformation des esters LIV [1] Sur la préparation de monoesters phosphoriques d'alcools tertiaires et sur leur vitesse de scission à différents pH
Authors: Cherbuliez Emile , Čolak‐Antić Sl. , Prince R. , Rabinowitz J. 
Published: December 2004

AbstractPhosphoric monoesters of unsubstituted tertiary alcohols can be prepared by alcaline hydrolysis (Ba(OH)2) of the tertiary esters, which unhappily are not obtained easily; moreover the yield is very low. These monoesters are much more conveniently obtained by bromine oxydation in neutral or slightly alcaline medium of the corresponding t‐alkyl phosphorous monoesters.
Etude de structures peptidiques à l'aide de phénylisothiocyanate VII [1] Sur la réaction de quelques acides aminés et de queiques thiols avec le phénylisothiocyanate
Authors: Cherbuliez Emile , Marszalek J. , Rabinowitz J. 
Published: December 2004

AbstractThe authors describe a modified procedure for the preparation of chrornatographically pure phenylthiohydantoines of amino acids.
Reaktionen der Salpetersäure mit aliphatischen Verbindungen 2. Mitteilung: Oxydation von Ölsäure
Authors: Gut G. , Guyer A. 
Published: December 2004

AbstractEs wurde die Umsetzung von Ölsäure mit Salpetersäure im heterogenen, flüssigen System bei Drucken zwischen 0 und 20 atü studiert. Die Anwendung von Druck ergibt eine gewisse Reaktionsbeschleunigung. Reaktionsdauer, Reaktionstemperatur sowie Salpetersäurekonzentration und Molverhältnis von Salpetersäure zu Ölsäure stehen in Wechselwirkung zueinander. Während mit zunehmender Reaktionsdauer primär gebildete Nitroverbindungen und Monocarbonsäuren zu Dicarbonsäuren abgebaut werden, begünstigen niedrige Temperatur, niedrige Salpetersäurekonzentration und geringe wässerige Phase die Bildung der ersteren Verbindungen. Im Gegensatz dazu kann durch Erhöhung der Salpetersäurekonzentration und Vergrösserung der wässerigen Phase auch bei relativ niedrigen Temperaturen der Anfall an höheren Dicarbonsäuren gesteigert werden.