bluuebunny/crossref_metadata_2025_split huggingface dataset:
De la chimie des ptérines. 10e communication. Substitutions nucléophiles de la ptérine tétrahydrogénée par l'ammoniac, les amines primaires et les amines secondaires
Authors: Viscontini M. , Merlini L. , Nasini G. , Von Philipsborn W. , Piraux M. 
Published: December 2004

AbstractNous avons comparé les spectres UV. et RMN. de l'hydrazino‐8‐ptérine d'une part et des produits d'addition oxydative de l'ammoniac, d'amines primaires et d'amines secondaires sur la tétrahydroptérine I, d'autre part. Cette comparaison démontre avec certitude que tous les produits étudiés sont aromatiques et que les cycles hydrazines de ces substances ne sont pas hydrogénés.
Umwandlung von Krötengiften (Bufadienoliden) durch Mikroorganismen III. 12β‐Hydroxymarinobufagin. 13. Mitteilung über Reaktionen mit Mikroorganismen
Authors: Schüpbach M. , Tamm Ch. 
Published: December 2004

AbstractIncubation of marinobufagin (1) with cultures of Fusarium lini (BOLLEY) gave the unknown 12β‐hydroxymarinobufagin (2). The structure of 2 was proved by the degradation of its diacetyl derivative 3 to methyl 3, 12‐dioxo‐14‐hydroxy‐Δ4‐14β, 17αH‐etianate (6) which was prepared from the known methyl 3‐oxo‐12β, 14‐dihydroxy‐Δ4‐14β, 17αH‐etianate (5).
Techniques nouvelles de microspectrophotométrie infra‐rouge des solides
Authors: Baudet P. , Otten Cl. , Cherbuliez E. 
Published: December 2004

AbstractProcedures are described for micro spectrophotometry in the infrared: (1) for the quantitative incorporation of micro quantities (0,0l–0,1 μmole) of substance in KBr pellets; (2) for confection of a thin layer nujol suspension of the same quantities of substance on the surface of KBr pellets.
Allyl‐para‐dienone durch direkte Allylierung von Phenolen
Authors: Barner R. , Boller A. , Borgulya J. , Herzog E. G. , von Philipsborn W. , von Planta C. , Fürst A. , Schmid H. 
Published: December 2004

Abstract1. Es wird gezeigt, dass substituierte Allylbromide Phenol mehr an Kohlenstoff alkylieren als Allylbromid selbst.
Rechnerische Untersuchung des Einflusses der Assoziation auf das Redoxpotential von Küpenfarbstoffen
Authors: Milićvić B. , Veillon F. 
Published: December 2004

AbstractThe influence of association on the redox potential of vat dyes has been studied by means of a simple theoretical model. The calculation method used is illustrated by the information flow chart (Fig. 1), which indicates also how the program in UNIVAC‐III‐FORTRAN‐IV has been written. The results obtained are summarized in Fig. 2.
Zur Kenntnis der BOHN‐SCHMIDT'schen Reaktion. 2. Mitteilung Reaktionen des Bis‐sulfuryldioxy‐(1, 9; 4, 10)‐anthracenchinons‐(5,8)
Authors: Winkler J. , Jenny W. 
Published: December 2004

AbstractChemical reactions prove that the product of the reaction of oleum with 1,4,5,8‐tetrahydroxy‐anthraquinone is an anthracene‐5,8‐quinone. The product of the action of high‐percent oleum on this quinone is investigated by mass spectroscopy.
Recherches sur la biochimie des cyclitols IX. Contribution à l'étude du métabolisme du ms‐inositol chez le Rat II
Authors: Charollais E. , Posternak Th. 
Published: December 2004

AbstractDes rats normaux et phlorizinés ont été traités par du ms‐inositol‐[U‐14C] et ‐[2‐14C]; chez le Rat normal, les radioactivités dans le CO2 expiré sont sensiblement les mêmes, ce qui implique une combustion complète de l'inositol. Chez le Rat phloriziné, il se produit une exaltation remarquable de la glucogenèse à partir de l'inositol. La radioactivité dans le CO2 expiré est alors notablement plus faible après administration d'inositol‐[2‐14C] qu'après celle d'inositol‐[U‐14C]; le rendement radioactif dans le glucose urinaire est par contre plus faible a` partir de l'inositol‐[U‐14C]. Ces faits, ainsi que les répartitions isotopiques observées dans le glucose urinaire, ont été discutés et expliquées.
Über das Problem der Ähnlichkeit in der Chemie Über spezifisch adsorbierende Silicagele III
Authors: Bartels H. , Erlenmeyer H. 
Published: December 2004

AbstractA discussion of the relationship between theoretical principles of chemical similarity on one hand and empirically measurable similarity on the other suggests that specifically adsorbing silica gels represent an experimentally simple model for ‘bioisomorphism’, the similarity found in biological systems.
Über die Inhaltsstoffe von Zizyphus oenoplia MILL. 2. Mitteilung. Zur Konstitutionsermittlung des Zizyphins
Authors: Zbiral E. , Ménard E. L. , Müller J. M. 
Published: December 2004

AbstractThe structure I for Zizyphin (C33H49O6N5), a peptidic alkaloid isolated from the rootbark of Zizyphus oenoplia MILL., has been determined by chemical degradation and confirmed by N.M.R. investigation. The stereochemistry of Zizyphin has been elucidated with the exception of the configuration of the ether group of the hydroxyproline unit, which is expected to belong to the natural series.
Welkstoffe und Antibiotika. 34. Mitteilung. Synthese von Isojavanicin und vereinfachte. Synthese von Javanicin
Authors: Widmer E. , Meyer J. W. , Walser A. , Hardegger E. 
Published: December 2004

AbstractAus 1,2,4‐Trimethoxybenzol (I) wurde das 2‐Methyl‐3‐acetonyl‐7‐methoxynaphtazarin (Isojavanicin) (XIIe) synthetisiert, wobei als entscheidende Aufbaureaktion die Einführung des Acetonylrestes durch MICHAEL‐Addition von Acetessigsäure‐benzylester an das 2‐Methyl‐5,7,8‐trimethoxy‐1,4‐naphtochinon (VIII) erfolgte. Entgegen unseren früheren Versuchen ermöglichte die analoge Anlagerungsreaktion an 3‐Methyl‐5,7,8‐trimethoxy‐1,4‐naphtochinon (XVII) eine wesentliche Vereinfachung der Synthese des Javanicins (XXa). Erwartungsgemäss zeigten Javanicin (XXa) und Isojavanicin (XIIe) in UV., IR., NMR. und Massenspektrogramm keine oder nur geringe, strukturell noch nicht interpretierbare Unterschiede, während die Mischprobe der beiden Substanzen eine überraschend grosse Schmelzpunktdepression gab.
Photochemische Reaktionen 30. Mitteilung. Die UV.‐Bestrahlung von 3β‐Hydroxy‐11‐oxo‐lanostan
Authors: Altenburger E. , Wehrli H. , Schaffner K. 
Published: December 2004

AbstractUpon irradiation of an ethanolic solution of 3β‐hydroxy‐11‐oxo‐lanostane(1) with ultraviolet light and subsequent acetylation of the crude reaction mixture, a single tertiary alcohol, the 11,18‐cyclobutanol derivative 4, could be isolated in about 40% yield (corrected for recovered starting material). According to previous findings[4] and in contrast to this result, the steroidal 4,4‐dimethyl‐ketone 15 is exclusively converted into the 11,19‐cyclobutanol 16. It is assumed that the additional methyl group in the 14α position of 1 causes this shift of the selective attack in the photo‐chemical cyclization process from CH3‐19 to CH3‐18.
Zur Thermodynamik der Metallcarbonate 1. Mitteilung. Löslichkeitskonstanten und Freie Bildungsenthalpie von Cadmiumcarbonat, ein Beitrag zur Thermodynamik des ternären Systems Cd‐H2O(l)‐CO2(g)
Authors: Gamsjäger H. , Stuber H. U. , Schindler P. 
Published: December 2004

AbstractThe equilibrium constant of the reaction CdCO3(s) + 2H+ = Cd2+ + H2O + CO2(g) has been determined at 25° in solutions of the constant ionic strength 3 M (Na)ClO4. With log*Kps0 = 6,47 ± 0,15 the free enthalpies of H2O, CO2(g) and Cd yield −161,17 ± 0,20 kcal for the free enthalpy of the reaction Cd(s) + C(s) + 3/2 O2(g) = CdCO3(s). A predominance diagram of the ternary system Cd − H2O(l) − CO2(g) is given.
Über Pterinchemie 12. Mitteilung. Darstellung zweier isomerer Dihydropterine
Authors: Viscontini M. , Huwyler S. 
Published: December 2004

AbstractEs wurden zwei isomere Dihydropterine, nämlich das 6,7‐Diphenyl‐5,6‐dihydropterin(IV) und das 6,7‐Diphenyl‐7,8‐dihydropterin (V), dargestellt und deren Struktur bewiesen.
De la chimie des ptérines 13e communication [1], préliminaire. Sur le mécanisme d'oxydation des tétrahydroptérines en dihydroptérines à pH physiologique
Authors: Viscontini M. , Bobst A. 
Published: December 2004

AbstractPar une étude cinétique de l'oxydation à l'air des tétrahydroptérines les auteurs montrent qu'après le transfert de deux électrons à l'atome d'oxygène, la ptérine se trouve sous forme d'une ptérine dihydrogénée de structure para‐quinoïdique, fort instable et se transposant rapidement en ptérine 7,8‐dihydrogénée.
Struktur der Drevogenine. Glykoside und Aglykone, 267. Mitteilung.
Authors: Sauer H. H. , Weiss Ek. , Reichstein T. 
Published: December 2004

AbstractThe structural formulae of the drevogenins A, B, P, and D from Dregea volubilis are deduced from chemical and physical properties of these substances as well as of their derivatives. Drevogenin D most probably is 3β,11β,12β,14β,20ζ‐pentahydroxy‐Δ5‐pregnene 1. Drevogenin P 11 is the corresponding 20‐oxo compound, the drevogenins B 17 and A 19 are the 12‐O‐acetyl and the 12‐O‐acetyl‐11‐O‐isovaleryl derivatives, respectively, of drevogenin P.
Muscimol, ein pharmakodynamisch wirksamer Stoff aus Amanita muscaria
Authors: Müller G. F. R. , Eugster C. H. 
Published: December 2004

AbstractEs wird die Isolierung einer Substanz mit stark narkosepotenzierender Wirkung, des Muscimols C4H6O2N2, Smp. 155–156°, aus dem Fliegenpilz (Amanita muscaria (L. ex FR.) HOOKER) beschrieben. Die Substanz hat salzartigen Charakter (Betain). Muscimol ist kein genuiner Inhaltsstoff des Fliegenpilzes, sondern entsteht bei der Aufarbeitung aus einer labilen Vorstufe, die ähnliche pharmakologische Wirkungen aufweist. Der Nachweis dieser Verbindungen in Papierchromatogrammen und in Elektropherogrammen wird beschrieben. Sie sprechen mit Ninhydrin gelb, mit GROTE's Reagens blau an. Als empfindliches Nachweismittel für Indole auf Papierchromatogrammen wird Phenylheptatrienal eingeführt.
Über die Aldolase der Kaninchenleber: Molekulargewicht, Dissoziation in Untereinheiten. Über Aldolasen, 5. Mitteilung
Authors: Christen Ph. , Göschke H. , Leuthardt F. , Schmid A. 
Published: December 2004

Abstract1. The sedimentation and diffusion coefficients of rabbit liver aldolase have been determined. The molecular weight has been calculated to be 151 000.
Synthesen in der Polymyxin‐Reihe 9. Mitteilung. Synthese von Polymyxin B1
Authors: Vogler K. , Studer R. O. , Lanz P. , Lergier W. , Böhni E. 
Published: December 2004

AbstractThe synthesis of the cycloheptapeptide 7α (Fig. 4) containing the α,γ‐diaminobutyric acid residues only in the L form, and its cristallization as pentaphosphate are reported. This latter substance proved to be in all respects identical with the cristalline penta‐ phosphate of natural polymyxine B1.
Zur Kenntnis der sogenannten «Alkalicarbonyle» VIII. Die Protolyse von KOCCOK
Authors: Büchner Werner 
Published: December 2004

AbstractThe protonolysis of potassium acetylenediolate KOCCOK has been investigated. The primary product from the reaction with anhydrous hydrogen chloride presumably is acetylenediol (I) which can be regarded as glyoxal‐dienol. It behaves however mainly as an acetylenic compound with an activated triple bond. Its tautomeric product glyoxal is formed in only negligible quantities. The main reaction is the polymerization of (I), giving rise to various aci‐reductones and hexahydroxybenzene. Together with these compounds diglykolide is also formed. All attempts to trap (I) in the form of DIELS‐ALDER‐addition products failed because of its rapid polymerization.
Salzkrykopie III. Eine verbesserte Apparatur zur Bestimmung der Depression des Umwandlungspunktes von GLAUBER‐Salz
Authors: Magyar B. , Schwarzenbach G. 
Published: December 2004

AbstractA new apparatus is described which allows the determination of the depression of the transition point of Na2SO4,10H2O, due to foreign solutes, with a higher precision than attained before. An investigation of the various sources of error shows that the greatest uncertainty is caused by the slowness with which the final equilibrium between the two solid phases and the liquid phase is reached.
Salzebullioskopie: Eine neue Methode zur Bestimmung des relativen Gewichtes von Ionen
Authors: Magyar B. 
Published: December 2004

AbstractThe vapor pressure of a saturated salt solution (the salt acting as inert electrolyte) is lowered by foreign solutes to an amount which is proportional to the molar concentration of the foreign solute. Any ion not contained in the inert electrolyte is acting as a foreign solute. Basing on that effect, a new method for the determination of the relative weights of ions has been developed and the principle of HILL was applied thereby. Sodium chloride acted as an inert electrolyte. The method has been applied to a number of different salts (foreign solute) with good success.
NMR.‐Untersuchungen an einfachen Furenidonsystemen. Synthese des unsubstituierten Δ2‐Furenidons‐(4) («β‐Hydroxyfuran»)
Authors: Hofmann A. , v. Philipsborn W. , Eugster C. H. 
Published: December 2004

AbstractThe parent compound of the Δ2‐furenidones‐(4) (= «β‐hydroxyfurans») has been prepared by mild hydrolysis of β‐methoxyfuran. It is not a phenolic substance, but exists as the tautomeric α,β‐unsaturated ketone (or vinylogous lactone), as shown by UV.‐, IR.‐ and NMR.‐spectra. The synthesis of 3‐acetyl‐Δ2‐furenidone‐(4) is described and the chemical and physical properties of this compound are compared with those of isomaltol.
Isolierung von Ergosin und Ergosinin neben Agroclavin aus den Samen von Ipomoea argyrophylla VATKE (Convolvulaceae). 64. Mitteilung über Mutterkornalkaloide
Authors: Stauffacher D. , Tscherter H. , Hofmann A. 
Published: December 2004

AbstractThe isolation of ergosine und ergosinine as well as agroclavine from seeds of Ipomoea argyrophylla VATKE is described. This is the first case where ergot alkaloids of the peptide type have been found in higher plants.
Die Kristallstruktur der 1, 6‐Methano‐cyclodecapentaen‐2‐carbonsäure
Authors: Dobler M. , Dunitz J. D. 
Published: December 2004

AbstractThe crystal structure of 1, 6‐methano‐cyclodecapentaene‐2‐carboxylic acid has been determined by X‐ray analysis of three‐dimensional diffractometer intensity data. The crystals are monoclinic, a = 7.59, b = 8.75, c = 15.02 Å, γ = 108° 5′, Z = 4, space group P21/b. The structure was established by direct methods and refined by full‐matrix least‐squares analysis, using anisotropic temperature factors. The perimeter is non‐planar, with bond lengths in the range 1.38–1.42 Å, but showing small, systematic variations. The methylene bridge has CC = 1.477 Å, ∢ CCC = 99.6°; these values are discussed in terms of a simple strain energy scheme. Hydrogen bonds (2.62 Å) between pairs of carboxyl groups lead to the formation of dimers in the crystal. The arrangement of CO and COH bonds appears to be disordered.
FRIEDEL‐CRAFTS‐Reaktionen mit aromatischen äthern. 3. Mitteilung [1]. Reaktionen einiger α, β‐ungesättigter Säurechloride mit Veratrol
Authors: Marquardt F.‐H. 
Published: December 2004

AbstractThe reaction of veratrole with cinnamoyl chloride and with crotonoyl chloride in the presence of aluminium chloride yielded phenyl vinyl ketones. In the case of cinnamic acid, the preparation of the acid chloride as well as the FRIEDEL‐CRAFTS condensation could be carried out in one step, without isolation and purification of the chloride. Application of this procedure to acrylic acid yielded as sole product a β‐chloro‐ketone derivative, whereas with crotonic acid a mixture of the corresponding phenyl vinyl ketone and β‐chloro‐ketone was obtained. Again a different result was obtained in the condensation of methacryloyl chloride, which yielded a 1‐indanone instead of an acyclic ketone.
Inosin‐N(1)‐oxid‐Nucleotide als Komplexbildner II. Aciditätskonstanten von Inosin‐N(1)‐oxid und von dessen 5′‐Monophosphat
Authors: Sigel Helmut 
Published: December 2004

AbstractA method is derived for the determination of acidity constants of ligands with two non‐identical acidic groups of similar acidity for the case of no interaction between these two groups. By this method the acidity constants of inosine‐5′‐monophosphate N(1)‐oxide are found to be pK = 5,43 and pK = 6,31. Spectrophotometric investigations show that pK belongs to the o‐hydroxy‐N‐oxide group. Therefore pK must be the acidity constant of the phosphate group. For comparison, the acidity constant of inosine N(1)‐oxide (pKA = 5,40) has also been determined.
Inosin‐N(1)‐oxid‐Nucleotide als Komplexbildner III. Komplexchemische Untersuchungen von Inosin‐N(1)‐oxid und von dessen 5′‐Monophosphat
Authors: Sigel Helmut 
Published: December 2004

AbstractStability constants of metal ion complexes, in which the metal ion is bonded to the o‐hydroxy‐N‐oxide ligand group of inosine N(1)‐oxide and inosine N(1)‐oxide 5′‐monophosphate, have been measured. The distribution of some bivalent metal ions between o‐hydroxy‐N‐oxide and phosphate ligand groups of inosine N(1)‐oxide 5′‐monophosphate has been estimated: Mn2+, Co2+, Ni2+, Cu2+, and Zn2+ are mainly bonded to the o‐hydroxy‐N‐oxide ligand group; with Mg2+, Ca2+, and Ba2+ an equilibrium between the two complexes has to be assumed.
Notiz über das ESR.‐Spektrum des Radikal‐Anions des Hexamethyl‐[3]‐radialens
Authors: Gerson F. , Heilbronner E. , Köbrich G. 
Published: December 2004

AbstractThe ESR.‐spectrum of the hexamethyl‐[3]‐radialene radical anion has been recorded and compared with that of the hexamethyl‐[6]‐radialene radical anion. Its hyperfine splitting pattern (coupling constant = 7,57 ± 0,08 Gauss) is in agreement with theoretical expectation and therefore supports the structure proposed for the hydrocarbon hexamethyl‐[3]‐radialene.
Die Strukturen von Erinin und Erinicin aus Hunteria umbellata
Authors: Bycroft B. W. , Hesse M. , Schmid H. 
Published: December 2004

AbstractThe main alkaloids Erinine and Erinicine from the leaves of the plant Hunteria umbellata (K. SCHUM.) HALL.f. have been shown on the basis of chemical and spectroscopic evidence to have the structures 1 and 2. The main arguments for the skeleton of the alkaloids rest on an interesting application of high resolution mass spectrometry for comparison of structurally similar compounds.
Die multiple Isomerisierung von Brom‐decahydroisochinolinen. Decahydroisochinoline. I. Teil
Authors: Grob C. A. , Wohl R. A. 
Published: December 2004

AbstractThe multiple isomerisation of 10α‐bromo‐N‐methyl‐decahydroisoquinoline (2a) is described. This compound is formed from 10β‐hydroxy‐N‐methyl‐decahydroisoquino‐line (3a) and from N‐methyl‐Δ9,10‐ and ‐Δ5,10‐octahydroisoquinoline, 4a and 5a respectively, in kinetically controlled reactions with HBr in acetic acid at 50°. At 85° the 10α‐bromide 2a is converted via the axial 5β‐trans‐bromide 8a into the equatorial 5α‐epimer 9a. At 140° an equilibrium mixture of 6β‐, 6α‐, and 7α‐trans‐bromides, 17a, 16a and 21a respectively, is obtained.
Die Überführung von (+)‐Δ3 Caren in (+)‐Δ4‐Caren
Authors: Ohloff G. , Schulte‐Elte K. H. , Giersch W. 
Published: December 2004

AbstractDie Einwirkung von N‐Lithiumäthylendiamin auf (+)‐Δ3‐Caren (1) führt zu einem Gleichgewicht mit dem doppelbindungsisomeren (+)‐Δ4‐Caren (2) im Verhältnis 1:2 = 60:40.
Komplexone XXXIX. Die Bildungs‐Enthalpie und ‐Entropie der Metallkomplexe des Diäthylentriaminpentaacetat‐Ions
Authors: Anderegg G. 
Published: December 2004

AbstractThe enthalpy changes involved in the formation of the proton and the metal complexes of diethylenetriamine‐pentaacetate ion have been determined using a direct calorimetric method. The values obtained are compared with those of other complexons.
Sur les possibilités du dosage non destructif du fluor par activation neutronique et spectrométrie gamma du fluor‐20 ou de l'azote‐16 (périodes de resp. 10,7 et 7,35 s). Etude comparative, application à la cryolithe
Authors: Haerdi W. , Voldet P. , Monnier D. 
Published: December 2004

AbstractIl a été mis au point une méthode non destructive de dosage du fluor basée sur la réaction nucléaire 19F(n,α)16N (période 16N = 7,35 s) résultant de l'activation du fluor au moyen de neutrons rapides. Avec le flux d'un réacteur du type AGN‐201‐P (2,5 · 109nth cm−2s−1), un temps de décroissance de 10 s et un temps de comptage de 6 s, on peut doser environ 5 mg de fluor; limite qui se fixerait à 0,5 μg si le flux était 104 fois plus grand.
Sur les dérivés de la fluorénone V [1] La diméthyl‐2,3 et la triméthyl‐2,3,6‐fluorénone
Authors: Chardonnens Louis , Laroche Bernard , Gamba Giacomo 
Published: December 2004

AbstractPar trois exemples on montre que l'acylation du bromo‐4‐xylène‐1,2 suivant FRIEDEL‐CRAFTS se fait en position 5. Le procédé est utilisé pour la synthèse de la diméthyl‐2,3, et de la triméthyl‐2,3,6‐fluorénone, à partir desquelles les hydrocarbures correspondants ont été préparés.
Die Alkaloide aus Melodinus australis (F. MUELLER) PIERRE (Apocynaceae)
Authors: Linde Horst H. A. 
Published: December 2004

AbstractAus einem Extrakt der Stammrinde von Melodinus australis (F. MUELLER) PIERRE (Apocynaceae) wurden 15 Alkaloide isoliert. Vier von ihnen sind mit Basen bekannter Struktur identisch: Ld 64 = Condylocarpin, Ld 67 = Stemmadenin, Ld 83 = Akuammidin und Ld 84 = (−)‐Quebrachamin. Ld 86 (17) dürfte mit (+)‐17‐Methoxy‐quebrachamin identisch sein. Die Struktur von sechs weiteren Alkaloiden liess sich ganz oder teilweise ableiten und konnte immer auf das Gerüst des Kopsinins zurückgeführt werden (Ld 62 (3), Ld 63 (1) (3), Ld 65 (3), Ld 85 (8), Ld 90 (9) und Ld 91 (12)).
Quartäre Alkaloide aus Pleiocarpa mutica BENTH. 2. Mitteilung [1] über das massenspektrometrische Verhalten quartärer Stickstoffverbindungen
Authors: Khan Zaheer M. , Hesse M. , Schmid H. 
Published: December 2004

AbstractAus den Wurzeln von Pleiocarpa mutica BENTH. wurden die quartären Alkaloide Hunterburnin‐α‐methochlorid (1), Hunterburnin‐β‐methochlorid (2), Huntrabrinmethochlorid (3), Pleiocarpamin‐methochlorid (4), Kopsininsäure‐methochlorid (8) und N(a), N(b)‐Dimethylsarpaginchlorid (9) isoliert und charakterisiert.
Etude de composés d'addition des acides de LEWIS XXV [1]. Mise en évidence de la structure ionique de divers composés d'addition benzoïques et mésitoïques d'acides de LEWIS, en solution dans le chlorure de méthylène
Authors: Oulevey G. , Susz B. P. 
Published: December 2004

AbstractThe oxocarbonium ion [RCO]+ is shown to be present in CH2Cl2 solutions of the addition compounds between benzoic and mesitoic acid or their chlorides, and five LEWIS acids: TiCl4, AlCl3, SbCl5, SbF5 and H2SO4 (H+). In CH2Cl2 solutions of the addition compound 2,4,6‐(CH3)3‐C6H2COOH, AlCl3 the existence of the mesitoylium ion has been confirmed by infrared and ultraviolet spectra and by nuclear magnetic resonance.
Über Isoxazolidin‐3,5‐dione
Authors: Michel K. , Gerlach‐Gerber H. , Vogel Ch. , Matter M. 
Published: December 2004

AbstractEs wird die Synthese von Vertretern der bisher unbekannten Isoxazolidin‐3,5‐dione durch Umsetzung von Hydroxylamin oder N‐monosubstituierten Hydroxylaminen mit substituerten Malonsäurechloriden beschrieben. Eine Anzahl der neuen Verbindungen wirken im Tierexperiment antiphlogistisch.
Polarographie an Festelektroden IV. Einfluss des Leitelektrolyten auf die submonoatomare Bleibedeckung von Silberelektroden
Authors: Schmidt E. , Gygax H. R. , Böhlen P. 
Published: December 2004

AbstractDer Einfluss verschiedener wässeriger Leitelektrolyte auf die Abscheidung von submonoatomaren Bleischichten an Silberelektroden wird chronoamperometrisch mit Hilfe einer Kammerzelle untersucht, wobei die Strombilanz des Elektrodenvorganges durch coulometrische Auswertung der Chronoamperogramme kontrolliert wird.
Die absolute Konfiguration von 1‐2H1‐Äthanol
Authors: Weber H. , Seibl J. , Arigoni D. 
Published: December 2004

Abstract(S)‐l‐2H1‐Ethanol (6) has been prepared in three steps from (–)‐erythro‐(2R,3S)‐3‐2H1‐butan‐2‐ol (2), itself available from cis‐butene by asymmetric hydroboration. In enzymatic tests with yeast alcohol dehydrogenase this deuterated ethanol proved to be indistinguishable from the laevorotatory isomer. This establishes the (S)‐chirality of the latter and at the same time defines the stereospecificity of the yeast alcohol dehydrogenase.