bluuebunny/crossref_metadata_2025 huggingface dataset:
Über die Alkylierung von Indazolonen
Authors: Schmutz J. , Hunziker F. , Michaelis W. , Wander A.
Published: December 2004

The alkylation of Indazolone (V) resp. 1‐Carbethoxy‐indazolone (I) is reported. The structures of the reaction products were ascertained with the help of IR. and UV. spectroscopy.
Welkstoffe und Antibiotika. 32. Mitteilung. Synthese von Javanicin‐5,8‐dimethyläther und Konstitution von Javanicin und Fusarubin
Authors: Hardegger E. , Steiner K. , Widmer E. , Pfiffner A.
Published: December 2004

Das aus 2‐Allyl‐3‐methyl‐5,7,8‐trimethoxynaphtol(I) hergestellte 2‐Acetonyl‐3‐methyl‐5,7,8‐trimethoxy‐l,4‐naphtochinon (VI) erwies sich identisch mit dem aus Javanicin gewonnenen Javanicind, B‐dimethyläther (VI). Damit wurde erstmals die Konstitution des Javanicins und des damit strukturell verknüpften Fusarubins gemä,ss VII bzw. VIIa bewiesen.
Substitution électrophile armatique. VI. Détermination des constantes σ+ pour les groupes Si(CH3)3 et Sn(CH3)3
Authors: Buschman O. , Grosjean M. , Nasielski J. , Martin R. H.
Published: December 2004

Rates of reaction between iodine and p‐trimethylsilyl‐ and p‐trimethylstannyl‐phenyl‐trimethyltin in methanol have been determined. These rates show that for the (CH3)3Si‐ substituent, the donor inductive effect and the withdrawing mesomeric effect of the metal cancel each other; for the (CH3)3Sn substituent, the donor inductive effect is preponderant.
Etude des composés d'addition des acides de LEWIS XXIII. Composés d'addition entre acétophénones méta‐substituées et TiCl4
Authors: Rossetti G. P.
Published: December 2004

The adducts of the electronic acceptor TiCl4 with m‐NO2−, m‐Br, m‐CH3O‐, and m‐CH3− acetophenones have been prepared.
Organische Phosphorverbindungen XV. Eine neue Methode zur Darstellung von Aminophosphinen und einige ihrer Reaktionen
Authors: Maier Ludwig
Published: December 2004

The reaction of (CH3)2NPCl2, [(CH3)2N]2PCl, Et2NPCl2 and C6H5(CH3)NPCl2 with organoaluminum compounds, (CH3)3Al, Et3A1, Et2AlCl, EtAlC12 and iso‐Bu3Al, has been studied. The preparation of dialkylamino‐dialkylphosphines, R2PNK′R″ (R  CH3, Et, i‐Bu; R′R″  CH3, Et; R′  CH3; R″  C6H5), and bis‐dialkylamino‐alkyl‐phosphines, RP(NR′2)2 (R  Et, i‐Bu, R′  CH3), and their reaction with alcohols and PC13 is described. The preparation of some unsymmetrical tertiary phosphine oxides, R2R′PO (R  CH3, Et; R′  C12H25) is also reported. In addition, results on the reaction of PC13 with Et3A1 and CH3AlCl2 are presented.
Über Pyromellitsäure‐ und Cumidinsäure‐Derivate. XII. Teil. Einige Benzimidazole aus Pyromellitsäure‐dianhydrid
Authors: Manukian B. K.
Published: December 2004

Die Umsetzung von Pyromellitsaure‐dianhydrid (I) mit o‐Phenylendiamin in kochendem Nitrobenzol ergab Terephtaloylen‐his‐benzimidazol (III), 1,2‐Bis‐(2‐benzimidazoly1)‐benzoylon‐benzimidazol (VII) und 1,2,4,5‐Tetrakis‐(2‐benzimidazolyl)‐benzol (VIII).
Die Anwendung von Aktivitätsgrakienten in der Dünnschichtchromatographie
Authors: Honegger C. G.
Published: December 2004

A simple method for preparation and use of adsorption activity gradients in thin layer chromatography is described. The results obtained are discussed in the light of further applications of this technique.
Recherches sur l'ozonnation de l'oléate d'éthyle suivie par spectrographie d'absorption IR
Authors: Briner E. , Fliszár S. , Rossetti G. P.
Published: December 2004

L'ozonation de l'oléate d'éthyle donne lieu à la formation de l'aldéhyde pélargonique. Mais les manifestations spectrographiques de la production d'aldéhydesont moins marquées que dans l'ozonation d'oléfines à Δ conjugé avec un groupe carbonyle.
Über die Aktivierung des Biotins und die Bildung der Acetyl‐CoA‐Holocarboxylase in der Leber de Hühnchens
Authors: Vallotton M. , Borel G. A. , Schuter R. , Leuthardt F.
Published: December 2004

Aus Hühnchenleber wurde eine Enzymfraktion abgetrennt, welche Biotin in Gegenwart von ATP in eine «aktivierte» Form, sehr wahrscheinlich Biotinyladenylat überführt.
Silylierung hydroxyaromatische Verbindungen mit Si‐N‐Verbindungen. 5. Mitteilung über Silicium‐organische Verbindungen
Authors: Ismail R. M.
Published: December 2004

Substituierte hydroxyaromatische Verbindungen lassen sich mit Si‐N‐Verbindungen, wie cyclischen Silazanen, Polysilazanen oder Diaminosilanen, silylieren. Das Verfahren eignet sich besonders zur Silylierung von Verbindungen, die neben Hydroxygruppen noch weitere Substituenten enthalten, oder auch zur Umsetzung kompliziert gebauter Verbindungen. Es wurden mehrere noch nicht beschriebene Verbindungen hergestellt und charakterisiert.
Über die Trennung flüchtiger Halogenide durch Oberflächenreaktionen
Authors: Gäumann A. , Lanini S.
Published: December 2004

Die Reaktionen flüchtiger Halogenide an metallischen Oberflächen werden im Hinblick auf ihre Eignung zur Abtrennung bestimmter Komponenten (Hochreinigung) von Halogenidgemischen diskutiert. Eine allgemeine Beurteilung derartiger Umsetzungen aus thermodynamischen Grössen (Gleichgewichtsannahme) ist nicht möglich.
Temperaturabhängigkeit des Potentials von Glaselektroden‐Messketten. Einfaches Hochtemperatur‐Ableitsystem
Authors: Clerc J. T. , Štefanac Z. , Simon W.
Published: December 2004

The temperature dependence of the EMF of glass reference electrode assemblies for pH measurements is discussed. A simple arrangement having an EMF of zero mV at pH = 7,0, independent of the temperature, suitable for high temperature applications, is described.
ESR.‐Spektren des Radiakal‐Anions des 1,4,5,8‐Tetraazanaphtalins
Authors: Gerson F. , Armarego W. L. F.
Published: December 2004

ESR spectra of the radical anions obtained from 1,4,5,8‐tetraazanaphthalene by electrolytic and chemical reduction have been recorded. The hyperfine structure of the electrolytically generated anion (solvent: N,N‐dimethylformamide; counter‐ion: tetraethylammonium) is that of an unassociated species, whereas evidence of strong ion‐pairing can be derived from the spectra of the chemically prepared anions (solvent: 1,2‐dimethoxyethane; counter‐ion: K⊕ or Na⊕).
Anorganische Dünnschicht‐Chromatograpie. 10. Mitteilung. Dünnschicht‐Chromatographie als Hilfsmittel in der Radiochemie
Authors: Seiler H. M.
Published: December 2004

Thin‐layer chromatography is applied to the separation of 234Th from natural 238U and to the separation of the neutron activation products of NH4Cl: 38Cl, 35S and 32P.
Die Struktur des Betanins. 7. Mitteilung. Über die Konstitution des Randenfarbstoffes Betanin
Authors: Wilcox M. E. , Wyler H. , Mabry T. J. , Dreiding André S.
Published: December 2004

It is shown that the glucose residue in betanin is attached at the 5‐hydroxyl group (structure 2): Treatment of betanin with diazomethane, acidic hydrolysis and acetylation afforded 5‐O‐acetyl‐6‐O‐methyl‐neobetanidin trimethylester (9), which was cleaved by alkali. The cleavage product was esterified with methanol and oxydized by means of FRÉMY salt to 5‐hydroxy‐6‐methoxy‐2‐methoxycarbonyl‐indole (15).
Schwefel in aromatischen Verbindungen als Ligandatom in Chelatkomplexen II
Authors: Kahmann K. , Sigel H. , Erlenmeyer H.
Published: December 2004

The hitherto unknown compounds 5‐(2‐Pyridyl)‐thiazole and 2‐(N‐Thioformyl‐ω‐aminoacetyl)‐pyridine have been synthesized. The stability constants of the Cu2+‐1:1‐complexes of 5‐(2‐Pyridyl)‐thiazole, 2‐(2‐Pyridyl)‐thiazole and 4‐(2‐Pyridyl)‐thiazole have been measured and are discussed. Evidence for the coordination of the sulphur atom in 5‐(2‐Pyridyl)‐thiazole is given.
Alkaloide aus Strychnos chlorantha PROG. 58. Mitteilung über Calebassen‐Alkaloide
Authors: Müller H. , Hesse M. , Wasser P. , Schmid H. , Karrer P.
Published: December 2004

Die Stammrinde und die Wurzelrinde einer in Costa Rica vorkommenden Strychnos‐Art, S. chlorantha PROG., wurden auf die in ihnen vorkommenden Alkaloide untersucht. Die Stammrinde enthielt nur verschiedene tertiäre Basen; zwei derselben wurden massenspektrometrisch identifiziert: Acetyldiabolin (= Diacetyl‐WIELAND‐GUMLICH‐Aldehyd) und Diabolin (N(a)‐Acetyl‐WIELAND‐GUMLICH‐Aldehyd).
Assoziation bei Azoverbindungen III: Untersuchung von 4‐Dimethylaminoazobenzol‐Derivaten in Lösung und in der Gasphase
Authors: Green H. S. , Jones F. , Syz M. , Zollinger Hch.
Published: December 2004

(1) Spectrophotometric measurements at widely different concentrations in neutral and acidic aqueous ethanol (50% vol.) show that derivatives of 4‐dimethylaminoazobenzene are not associated under these conditions.
Absolute Konfiguration von Alkaloiden der Aspidospermin‐Gruppe
Authors: Klyne W. , Swan R. J. , Bycroft B. W. , Schumann D. , Schmid H.
Published: December 2004

The absolute configuration of a number of aspidospermine alkaloids has previously been suggested by a correlation of their molecular rotations with those of some strychnine alkaloids. This correlation is now strengthened and extended by a study of the optical rotatory dispersion (ORD) curves.
Zur Kenntnis der Hexaalkylbenzole. 7. Mitteilung. Anomale FRIEDEL‐CRAFTS‐Reaktionen von Hexa‐n‐propylbenzol
Authors: Hopff H. , Gati A.
Published: December 2004

Hexa‐n‐propylbenzene undergoes the same anomalous type of FRIEDEL‐CRAFTS reactions as hexaethyl and hexamethyl benzene. Acid chlorides and dicarboxylic anhydrides produce under elimination of an alkyl group the corresponding penta‐n‐propyl‐phenyl ketones and penta‐n‐propyl‐benzoyl carboxylic acids respectively. Reaction of the carbamylchloride‐aluminiumchloride complex yields penta‐n‐propyl‐benzamide which has been hydrolysed to penta‐n‐propyl‐benzoic acid.
Das massenspektrometrische Verhalten quartärer Stickstoffverbindungen 1. Mitteilung
Authors: Hesse M. , Vetter W. , Schmid H.
Published: December 2004

Es wurde das Verhalten quartärer Alkaloidsalze im Massenspektrometer untersucht. Dabei fanden sich drei prinzipiell verschiedene Verhaltensweisen:

Angriff des Anions an der N(b)‐Methylgruppe unter Bildung des tertiären Amins (Demethylierungsbase)und des Methylhalogenids.

Thermischer HOFMANN‐Abbau unter Bildung eines ungesättigten Amins (HOFMANN‐Base) und des Halogenwasserstoffs.

Angriff des Anions an einem der drei anderen N(b)‐Substituenten unter Bildung eines tertiären Amins und Eintritt des Halogenatoms in dieses (Substitution).
3‐O‐Methyl‐6‐desoxy‐D‐gulose Desoxyzucker, 37. Mitteilung
Authors: Kaufmann Heinz
Published: December 2004

A synthesis of 3‐O‐methyl‐6‐deoxy‐D‐gulose has been carried out using 2,3‐di‐O‐benzoyl‐β‐methyl‐D‐glucopyranoside, (prepared in seven steps form D‐glucose) as starting material.
Decahydrochinolole. 3. Teil. Synthese und Konfiguration der epimeren 7‐Hydroxy‐trans‐decahydrochinoline
Authors: Grob C. A. , Wilkens H. J.
Published: December 2004

The epimeric 7α‐ and 7β‐hydroxy‐trans‐decahydroquinolines, 1 and 2 respectively, have been prepared from Δ8,9‐octahydro‐7‐quinolone (5) and their configurations and conformations determined by chemical and NMR.‐spectral methods.
Struktur und Aktivität von CuII‐Komplexen bei der Katalyse radikalischer H2O2‐Zerlegungen
Authors: Brintzinger H. , Erlenmeyer H.
Published: December 2004

The bidentate N‐chelates CuII‐bipyridine and CuII‐ethylenediamine are found to be more active in catalysis of H2O2 decomposition than the O‐chelate CuII‐diphosphate and the terdentate N‐chelate CuII‐terpyridine. This is parallelled by changes in the tendency to form ternary peroxo complexes from the respective chelates. Mechanisms and consequences of these catalytic features are discussed.
Die Konstitution von Diacetoxyscirpenol
Authors: Sigg H. P. , Mauli R. , Flury E. , Hauser D.
Published: December 2004

The structure of diacetoxyscirpenol (C19H26O7), the main metabolite of several Fusarium species, has been shown to be 1.
Über den sterischen Bau der pentacyclischen Chromkomplexe aus 1, 2‐Di‐(2‐amino‐benzolsulfonamido)‐äthan bzw. 1,3‐Di‐(2‐amino‐benzolsulfonamido)‐propan → β‐Naphtol
Authors: Schetty G.
Published: December 2004

Pentacyclic chromium complexes are produced from the bisazo dyestuffs 1,2‐(resp. 3)‐(2‐amino‐benzenesulfonamido)‐ethane (resp. propane) → β‐naphtol. It is concluded from their absorption spectra that their steric arrangement corresponds to a «1:2‐sandwich complex» linked internally, preference being given to one of the possible coordination arrangements. Because of the great similarity of their spectra to that of a previously described «1:2‐chromium‐sandwich complex» from anthranilic acid → β‐naphthol, it is concluded that they are arranged in the same way as the latter.
Odeur et constitution XXIII. Le méthyl‐2‐isopropényl‐5‐anisole, constituant de l'huile essentielle de «Hinoki» de Formose
Authors: Thomas Alan F.
Published: December 2004

A new substance, isolated from “Hinoki” oil, has been identified by synthesis as 2‐methyl‐5‐isopropenyl‐anisole. Lead tetraacetate oxidation of carvacryl methyl ether leads to attack on the methyl group ortho to the ether function rather than on the isopropyl group.
Untersuchung reversibler Photoprozesse durch Blitzlichtphotolyse I. Eine Blitzlichtapparatur mit Zündfunkenstrecke
Authors: Wild U. , Günthard Hs. H.
Published: December 2004

A flash photolysis apparatus is described. The photoflash discharge tube forms the inner conductor of a quasi‐coaxial line connected by a triggered spark gap to the storage capacitor. Some operating characteristics of the spark gap are given. The range of flash energy is 50–1500 J at pulse durations of less than 10 μs in the visible region. A capillary discharge is used for spectroflash with 150 J max. energy, triggered by a similar spark gap. Combined with a continuous light source, several types of experiments may be carried out: flash photolysis, kinetic spectrophotometry with observation of transient absorption, and emission spectra. The sample area is sufficiently flexible to allow the use of a wide variety of cells, permitting studies over a wide range of temperature.
Recherches expérimentales sur l'ozonation des fumarate, maléate et cinnamate d'éthyle, suivie par spectrographie d'absorption IR. II. Confrontation de la scission spontanée des ozonides des fumarate et maléate d'éthyle avec celle de l'ozonide de cinnamate d'éthyle
Authors: Briner E. , Rossetti G.‐P. , Fliszàr S.
Published: December 2004

La scission spontanée des ozonides de maléate et de fumarate d'éthyle en solution dans CCl4 conduit aux glyoxylate et oxalate acide d'éthyle (ce dernier se transformant en oxalate diéthylique et en acide oxalique).
Über die Herkunft der C‐Atome 2 und 8 der Harnsäure bei Drosophila melanogaster
Authors: Brenner‐Holzach O. , Leuthardt F.
Published: December 2004

Uric acid has been isolated from adult Drosophila melanogaster fed with glucose‐[1‐14C] and glucose ‐[6‐14C]. The specific activities of carbon 2 and 8 of the purine skeleton were considerably higher after feeding glucose‐[6‐14C] than after glucose‐[1‐14C]. The same experiments with serine‐[1‐14C] and serine‐[3‐14C] have shown that the C‐3 of serine leads to high activities of C‐2 and C‐8 of the purine ring.
Löslichkeitsprodukte von Metalloxiden und ‐hydroxiden. 10. Mitteilung. Löslichkeitsprodukte von Zinkoxid, Kupferhydroxid und Kupferoxid in Abhängigkeit von Teilchengrösse und molarer Oberfläche. Ein Beitrag zur Thermodynamik von Grenzflächen fest‐flüssig
Authors: Schindler P. , Althaus H. , Hofer F. , Minder W.
Published: December 2004

The effect of particle size and molar surface on the solubilities of ZnO, Cu(OH)2 and CuO has been determined at 25° in solutions of a constant ionic strength (0,2) consisting primarily of sodium perchlorate. From the experimental data, the following values for the free enthalpy of the solid‐liquid interface were calculated:

equation image
.
Über den Druckverlust strömender Gase in Schüttschichten bei erhöhtem Druck
Authors: Böhlen B. , Bürki H. U. , Guyer A.
Published: December 2004

Es wurden Untersuchungen über den Druckverlust strömender Gase in Schüttschichten bei Absolutdrucken von 1–21 ata durchgeführt. Die Untersuchungen führten zur Bestimmung von Reibungs‐ und Form‐Oberflächen‐Faktoren für geometrisch definierte und undefinierte Partikel mit poröser und unporöser Kornstruktur.
Die Kristallstruktur von 1,4‐trans‐Diaminocyclohexan‐dihydrochlorid
Authors: Dunitz J. D. , Strickler P.
Published: December 2004

Crystals of 1,4‐trans‐diaminocyclohexane dihydrochloride are monoclinic, a = 6.36, b = 5.27, c = 14.91 Å, γ = 100°, space group P21/n (first setting), Z = 2. The structure has been determined by three‐dimensional analysis based on counter data. The mean CCC‐angle in the cyclohexane ring is 110,7°.
FRIEDEL‐CRAFTS‐Reaktionen mit aromatischen äthern. 2. Mitteilung [1]. Reaktionsverlauf beim Umsatz von Veratrol mit Zimtsäure bzw. Zimtsäure‐methylester in Polyphosphorsäure
Authors: Marquardt F.‐H.
Published: December 2004

The condensation of cinnamic acid and veratrole, yielding 5, 6‐dimethoxy‐1‐indanone, takes place with acylation as the first step (e.g. with 3′, 4′‐dimethoxy‐chalcone as intermediate), followed by alkylation. If the methyl ester of cinnamic acid is employed instead of the acid itself, the order of the steps is reversed (e.g. with methyl β‐(3,4‐dimethoxyphenyl)‐β‐phenyl‐propionate as the main intermediate).
ESR.‐Spektren von CuN4‐Chromophoren: Komplexe des zweiwertigen Kupfers mit Pyridin und Pyridinderivaten
Authors: Schneider W. , Zelewsky A. V.
Published: December 2004

The ESR. spectra of four copper complexes, containing pyridine, 4‐picoline, 4‐dimethylaminopyridine, and 4‐cyanopyridine as ligands, have been measured in the solid state. Single crystals of the corresponding PtII oder CdII compounds were used as host lattices and magnetic diluents. The spectra of the CuN4 chromophores, showing resolved hyperfine structure due to copper and nitrogen nuclear magnetic momenta, could be analysed within a Spin‐Hamiltonian corresponding to effective symmetry D4h. They have been interpreted by means of molecular orbital theory, and the delocalization parameters have been deduced on the assumption of near degeneracy of the excited levels within the widths of the observed visible absorption band. It is shown that the delocalization parameters apparently do not display any influence of the widely different substituents in the 4 position of the ligands. The parameter describing the π‐antibonding character of the excited state, Eg, differs from the expected value. This is probably due to some fundamental deficiency in the MO scheme so far generally applied to chromophores CuO4, CuO2N2 and CuN4.
Inaktivierung der Kaninchen‐muskel‐und‐leberaldolase in 4M Harnstofflösung. Über Aldolasen, 6. Mitteilung
Authors: Christen Ph. , Leuthardt F. , Schmid A.
Published: December 2004

(1) Muscle and liver aldolase from rabbit are reversibly inactivated in 4M urea at pH 7,6, without being split into sub‐units. At the same pH value muscle aldolase, but not liver aldolase, dissociates into three sub‐units, if the ionic strength is increased by the addition of NaCl to a final concentration of 0,2M. At pH 5,5 and low ionic strength (in the absence of NaCl) both aldolases dissociate into sub‐units.
Messung der HAMMETT'schen Aciditätsfunktion in Schwefelsäure/Wasser mittels Glaselektroden
Authors: Clerc J. T. , Štefanac Z. , Simon W.
Published: December 2004

Suitable glass electrodes can be used to measure the HAMMETT Acidity Function Ho in sulfuric acid/water in the range Ho = −1 to H0 = − 9,6 with a standard deviation of 0.04 H0 unit. It is shown that such glass electrodes respond as a protode in the range H0 = −1 to H0 = −6.
Untersuchungen über die Biosynthese der Pterine bei Drosophila melanogaster 3. Mitteilung: Über die Herkunft der Seitenkette im Drosopterin
Authors: Brenner‐Holzach O. , Leuthardt F.
Published: December 2004

(1) Larvae of Drosophila melanogaster (wild type) were fed with differently labelled [14C]‐glucose. Drosopterine and isoxanthopterine were isolated from the extracts of the young flies. After the administration of glucose‐[1‐14C] both pterines had the same specific radioactivity; after glucose‐[U‐14C] and glucose‐[6‐14C] isoxanthopterine had a lower activity than drosopterine (70% and 45% resp. with respect to the latter).
Polarographie an Festelektroden III. Gleichspannungspolarographie von Thallium an einer Silberelektrode vom Kammertyp
Authors: Schmidt E. , Gygax H. R.
Published: December 2004

Die Abscheidung von Thallium auf Silberelektroden aus wässeriger Lösung wird analog der Abscheidung von Blei auf Silberelektroden gleichspannungspolarographisch mit Hilfe einer Messelektrode vom Kammertyp untersucht. Die Ausbildung der ungesättigten (submonoatomaren) Deckschicht erfolgt bei genügend langsamem Potentialanstieg polarographisch reversibel, wobei sich die Thalliumaktivität als Bedeckungsisotherme vom Sigmoidtyp darstellen lässt. Die Aktivitätsisotherme des Thalliums ist derjenigen des Bleis vergleichbar. Die Strombilanz des Elektrodenvorganges wird durch coulometrische Auswertung der Polarogramme geprüft.
Die Cardenolide von Parquetina nigrescens (AFZEL) BULLOCK 3. Mitt. Die Konstitution 5 neuer Cardenolide (16‐Dehydrostrophanthidin und verwandte Substanzen). Glykoside und Aglykone, 271. Mitteilung [1]
Authors: Berthold R. , Wehrli W. , Reichstein T.
Published: December 2004

The structures of five new Cardenolides (A1, C, D, E, and K), isolated from Parquetina nigrescens, have been either partially or totally elucidated. Substance A1 is 16β‐acetoxystrophanthidin 1 and substance C is 16‐dehydrostrophanthidin 4. Substance D is a monodigitoxide of 16‐dehydrostrophanthidin whose structure is probably that shown in formula 7. E was found to be a mixture of 16‐dehydrostrophanthidol 8 and the digitoxide of an unidentified genin. Substance K is probably the rhamnoside of 16‐acetoxystrophanthidin, whose structure is probably represented by 2 16‐dehydrostrophanthidol 8 which was used as a reference substance, was obtained by reduction of 16‐dehydrostrophanthidin 4 with NaBH4.
Experimentelle Beiträge zum MILLS‐NIXON‐Effekt II: Arin‐Substitution und magnetische Kernresonanzspektren von isomeren Bromindanen und Bromtetralinen [1] 2. Mitteilung über nucleophile aromatische Substitutionen [2]
Authors: Eigenmann G. , Zollinger Hch.
Published: December 2004

1. The reaction of the isomeric bromo‐o‐xylenes, bromoindans and bromotetralins with lithiumpiperidide and piperidine was investigated. The ratios of the isomers of the thus formed piperidinoaromatic compounds as well as the relative reactivities of the o‐H atoms were determined.
Untersuchung reversibler Photoprozesse durch Blitzlichtphotolyse II. Triplett‐Triplett‐Annihilation von Anthracen
Authors: Wild U. , Günthard Hs. H.
Published: December 2004

Using a flash photolysis apparatus, described in a previous paper, the kinetics of triplet decay and delayed fluorescence of anthracene in glycerol solutions in the temperature range of −20°C to + 90°C have been investigated. By statistical analysis of the kinetic curves the triplet decay kinetics in viscous solvents is shown to consist of competing first and second order reactions. The first order contribution originates from a temperature independent first order decay and a pseudo first order quenching process, the latter having an energy of activation less than that of viscous flow. The second order contribution is produced by the triplet‐triplet annihilation process T + T → S* + S, which is diffusion controlled with an energy of activation equal to that of viscous flow, the frequency factor being in good agreement with DEBYE'S formula. The kinetics of delayed fluorescence are discussed in terms of the kinetic equations of PARKER'S scheme for P‐type delayed fluorescence. Experimentally the delayed fluorescence is shown to be consistent with the observed kinetics of the triplet decay using PARKER'S treatment.
Derivate der Betalaminsäure
Authors: Wilcox M. E. , Wyler H. , Dreiding André S.
Published: December 2004

Betalamic acid, the structural unit which is characteristic for the watersoluble centrospermae pigments, the betacyanins and the betaxanthins, has been prepared as the semicarbazone of the dimethyl ester by a “base exchange reaction” from betanidin trimethyl ester and semicarbazide. The UV.‐ and NMR.‐spectra support the proposed structure. The semicarbazone has been reconverted to betanidin trimethyl ester by means of cyclodopa methyl ester.
L'aromatisation acido‐catalysée de l'oxime d'une cyclohexadiénone
Authors: Dvolaitzky Maya , Dreiding André S.
Published: December 2004

p‐Cyclohexadienone‐oximes show NMR.‐signals for the syn‐α‐proton at about δ = 6,9; the syn‐β‐, the anti‐α‐and the anti‐β‐proton signals, however, appear in the region of δ = 6,0−6,4. This is based on a comparison of the NMR.‐spectra of the oximes of spiro[5 · 5]undeca‐1,4‐diene‐3‐one and 4‐bromo‐spiro[5 · 5]undeca‐1,4‐diene‐3‐one and on IR.‐spectroscopic data and steric considerations. These chemical shifts differ characteristically from those of the corresponding vinyl hydrogens of the parent p‐cyclohexadienones; the difference must be attributed on the one hand to the effect of the syn‐hydroxyl group and on the other to the nitrogen. On this basis it is possible to assign syn‐ and anti‐configurations respectively to the oximes of steroidal A‐ring dienones and even to determine quantitatively the composition of mixtures of the syn‐anti isomers, which are usually difficult to separate.
IR.‐spektroskopische Untersuchungen in der Imidazol‐Reihe
Authors: Manukian B. K.
Published: December 2004

Es wurden einige «Benzoylen»‐, «Naphtoylen»‐ und «Diphenoylen»‐imidazole bzw.‐perimidine hergestellt und IR.‐spektroskopisch mit einer Anzahl ähnlich gebauter neuer Farbstoffe verglichen.
Zur Kenntnis der Hexaalkylbenzole. 9. Mitteilung;. Zur Cyclisierung polyalkylierter o‐Benzoylbenzoesäuren
Authors: Hopff H. , Gati A.
Published: December 2004

The cyclisation of o‐(penta‐n‐propyl‐benzoyl)‐benzoylchloride by anhydrous aluminium chloride produced the mixture of the lactone of 5, 6, 7, 8‐tetra‐n‐propyl‐9‐hydroxy‐9, 10‐dihydro‐10‐ethyl‐anthracene‐1‐carboxylic acid, and of 5, 6, 7, 8‐tetra‐n‐propyl‐9,10‐dihydro‐10‐ethyl‐anthracene‐1‐carboxylic acid.
Migration électrolytique d'ions argent radioactifs dans des macrocristaux de bromure d'argent
Authors: Steiger R. , Boustany K. , Boissonnas Ch. G.
Published: December 2004

A cylindrical disk of macrocrystalline silver bromide marked on one side with radioactive silver ions (110mAg) has been used as a diaphragm for electrolysis between two cells filled with water in which two platinum electrodes were immersed.
Fluoreszenzmethoden zur histochemischen Sichtbarmachung von Monoaminen. 6. Identifizierung der fluoreszierenden Produkte aus m‐Hydroxyphenyläthylaminen und Formaldehyd
Authors: Corrodi H. , Jonsson G.
Published: December 2004

It is known that in tissue slices treated with dry gaseous formaldehyde according to the histochemical technique of HILLARP & FALCK structures containing catecholamines show a green fluorescence in the fluorescence microscope. The m‐hydroxyphenylethylamines m‐tyramine, m‐hydroxyamphetamine and m‐hydroxynorephedrine (metaraminol) enclosed in vitro in dry protein films undergo a similar reaction with dry gaseous formaldehyde and form fluorescent products which have been characterized as 6‐hydroxy‐3,4‐dihydro‐isoquinolines existing predominantly in the quinoidal form fluorescing at 385/510 nm. By treatment of these protein layers with gaseous hydrogen chloride another form fluorescing at 360/420 nm can be obtained which is not visible in the fluorescence microscope with the usual equipment.
Recherches sur la formation et la transformation des esters LXIV. Acides aminoalcoylsulfuriques et isothiocyanates: N‐thiocarbamylation sans ou avec alcoylation cyclisante intramoléculaire
Authors: Cherbuliez Emile , Baehler Br. , Jaccard S. , Jindra H. , Weber G. , Wyss G. , Rabinowitz J.
Published: December 2004

Aminoalkyl sulfuric monoesters with primary or secondary amino groups – with the exception of colaminesulfuric monoester – react with isothiocyanates in the presence of one equivalent of a base to yield the corresponding hydrosoluble salts of [N‐aryl(aralkyl or alkyl)thiocarbamoyl]‐aminoalkyl sulfates.
Ermittlung der absoluten Konfiguration von Indolinalkaloiden durch Vergleiche der Optischen Rotationsdispersionen ihrer N(a)‐Acylderivate
Authors: Klyne W. , Swan R. J. , Bycroft B. W. , Schmid H.
Published: December 2004

A further application of Optical Rotatory Dispersion (ORD) for indole alkaloids containing an N‐acylindoline chromophore has completely substantiated an earlier assignment of the absolute configuration of Aspidosperma alkaloids and has extended the general scope of this method, allowing assignments to the absolute configuration of N(a)‐acetyl‐aspidospermatidine and limatine.
Die Auftrennung der Chlorophylle durch Gegenstromextraktion
Authors: Arn H. , Grob E. C. , Signer R.
Published: December 2004

The chlorophylls a and b from nettle leaves have been separated from each other and from the carotenoids by counter‐current distribution in a new apparatus, which will be described in detail in a subsequent paper. The solvent system used was methanol‐water 95:5 (with addition of 10−3% of oxalic acid to prevent allomerization) and petroleum ether (b.p. 50–70°C).
Zur Kenntnis der sogenannten «Erdalkalicarbonyle»
Authors: Büchner Werner
Published: December 2004

The alkaline earth metals in liquid ammonia react with carbon monoxide to form the so‐called ‘alkaline earth metal carbonyls’. These products which according to older literature are formulated as M(CO)2(M = Ca, Sr, Ba) contain only 65–70% of the expected amount of carbon monoxide. As can be seen from the nitrogen content of the compounds the solvent ammonia participates in the reaction. By hydrolysis leading to a variety of compounds it is demonstrated that the ‘alkaline earth metal carbonyls’ are mixtures of substances such as metal acetylenediolates, metal methoxides, and ammonium carbonate. These mixtures are different from the ‘alkali carbonyls’ as for instance can be seen from the low acetylenediolate content of the ‘alkaline earth metal carbonyls’.
Synthesen in der Polymyxinreihe. 11. Mitteilung. Die Synthese von Circulin A
Authors: Studer R. O. , Lergier W. , Vogler K.
Published: December 2004

The synthesis of the cycloheptapeptide XIII (Figure 2), corresponding to the structure proposed by T. SUZUKI et al. for the antibiotic circulin A, and its crystallization as pentaphosphate are reported. This synthetic compound proved to be identical in all respects with the crystalline natural circulin A pentaphosphate.
Synthèses dans la série des bis‐indéno‐fluorènes I. Le dihydro‐13, 15‐5H‐bis‐indéno[1, 2‐a;1′, 2′‐h]fluorène
Authors: Chardonnens Louis , Gamba Giacomo
Published: December 2004

The synthesis of 13,15‐dihydro‐5H‐diindeno[1,2‐a;1′,2′‐h] fluorene in six steps starting from flourenone 4‐carboxylic acid and 2,4‐dichlorotoluene is described. As an intermediate product the 5, 13, 15‐trioxo‐derivative is obtained.
Ringschlussreaktionen an Pleiocarpa‐Alkaloiden
Authors: Kump Christl , Dugan J. J. , Schmid H.
Published: December 2004

Alkaloids with the pleiocarpin skeleton have been found to undergo ring closure on pyrolysis to give heptacyclic compounds with the kopsan (XI) carbon skeleton. Kopsinic acid (V), the main example, gave kopsanone (XIII). The structure XIII for kopsanone has been established by physical and chemical methods, degradation to the methine base XVII and reduction to kopsan (XI). A mechanism to explain these cyclizations is discussed.
Zur Frage der Existenz von «γ‐Sitosterol» Nachweis von Cholesterol als Bestandteil des «γ‐Sitosterols» einer Digitalis‐Art
Authors: Linde Horst , Ergenç Nedime , Meyer Kuno
Published: December 2004

Mit Hilfe von Gas‐Chromatographie und Massenspektroskopie wird gezeigt, dass das aus Digitalis canariensis L., var. isabelliana

Neuerdings Isoplexis isabelliana (WEBB) MASF. benannt [13]

. isolierte «γ‐Sitosterol» [12] aus β‐Sitosterol, Stigmasterol und Cholesterol besteht. Der Name «γ‐Sitosterol» als Bezeichnung eines einheitlichen Sterins ist zu streichen.
Zur Thermodynamisch‐Phänomenologischen Beschreibung der Färbevorgänge II. Kontinuierliches Modellsystem
Authors: McGregor R. , Milicević B.
Published: December 2004

Only under very restrictive conditions can the non‐equilibrium thermodynamic theories of dissipative processes in continuous media be applied to a description of dyeing systems. A primary restriction results from the complex physico‐chemical nature of fibrous polymers. Under certain conditions, the assumption that a textile substrate may be regarded as a water‐swollen, isotropic gel is possible, and circumvents this restriction.
L‐ Tyrosinhydrazid als optisch aktive Base zur Spaltung von DL‐Prolin, DL‐Alanin und DL‐Isoleucin in die optischen Antipoden
Authors: Vogler K. , Lanz P.
Published: December 2004

A new procedure for the resolution of DL‐proline, DL‐alanine and DL‐isoleucine into the optical antipodes is outlined. It is based on the separation of diastereoisomeric salts of D‐ or L‐tyrosine hydrazide with Z‐DL‐proline, Z‐DL‐alanine and Z‐DL‐isoleucine, by means of fractional crystallization in suitable solvents such as lower aliphatic alcohols and water. It is shown that the new method gives excellent yields even with half the molar amount of the optically active resolving agent.
Protonenresonanzspektren von Pteridinen V. 2‐Amino‐4‐oxo‐3,4‐dihydropteridine
Authors: Dieffenbacher A. , Mondelli R. , v. Philipsborn W.
Published: December 2004

The proton magnetic resonance spectra of 20 pteridines, i.e. 2‐amino‐4‐oxo‐3,4‐dihydropteridine and 19 derivatives, have been measured at 100 Mc/s and 60 Mc/s in CF3COOH under standardized conditions as the mono‐cations. The chemical shifts of the vinyl‐, methyl‐ and NH2‐protons are tabulated, and some typical spectra are illustrated. The influence of the substrate concentration and of solvent effects upon the NH‐signals have been studied. Protonation always takes place at N(1) or N(3), and an attempt is made to correlate δ(NH2) and pKa values.
Zur Berechnung der Aciditätskonstante von Sorbit aus der Sorbitolysenkinetik von Reaktivfarbstoffen. 4. Mitteilung über reaktionsmechanistische Untersuchungen an Reaktivfarbstoffen
Authors: Rys P. , Zollinger Hch.
Published: December 2004

The first acid dissociation constant of sorbitol is redetermined (PKa = 13.00; 60°).
Über in 6‐Stellung basisch substituierte Morphanthridine. 8. Mitteilung über siebengliedrige Heterocyclen
Authors: Hunziker F. , Künzle F. , Schmutz J.
Published: December 2004

Morphanthridines III with a basic substituent in position 6, which show neuroleptic activity, have been synthesised as follows:

Chlorination of the lactams I with POCl3 gave the iminochlorides II, which were converted by bases to the amidines III. The 11‐oxo‐morphanthridines VI and VII were synthesised using the same procedure, 2‐(1‐methylpiperazine‐4‐carbonyl)‐2′‐amino‐benzophenone (XI) was obtained directly from the 6‐chloro‐11‐oxo‐morphanthridine (V) or by extended heating of VI with N‐methylpiperazine. Reduction of the 11‐oxo‐compounds VI and VII with NaBH4 gave the 11‐hydroxy‐compounds IX and X. 3‐(2‐aminophenyl)‐phtalide (VIII) resulted from the acid hydrolysis of IX.
Massenspektrometrische Untersuchungen an einigen Hexahydrotriazinen
Authors: Schumacher Ernst , Taubenest Richard
Published: December 2004

Mass spectra of some hexahydrotriazines have been investigated and mechanistic interpretations of the production of the principal ions formed und erelectron impact are given, using high resolution. A new technique for sample introduction is described, suitable for introducing low boiling liquids sensitive to decomposition into the ion source via a direct inlet system.
Die Biosynthese der Cardenolid‐ und Spirostan‐Glykoside in Digitalis lanata EHRH. Vergleich der Bildungsraten Glykoside und Aglykone, 274. Mitteilung
Authors: v. Euw J. , Reichstein T.
Published: December 2004

Young plants of Digitalis lanata were fed by the vick technique with ammonium mevalonate‐[3‐14C]. The isolation from the leaves of pure digitoxigenin and gitoxigenin (without dilution) was described formerly [5]. We describe here the isolation from the same plants of the four pure spirostanols: tigogenin (5), digalogenin (6), gitogenin (7) and digitogenin (8), again without dilution. These spirostanols contained about 3–5 times more radioactivity per Mol than the cardenolides.
Über 9β, 10α‐Steroide. 2. Mitteilung. Strukturaufklärung von mikrobiologischen Umsetzungsprodukten mit Sauerstoff‐Funktion in Stellung 11
Authors: Saucy G. , Els H. , Miksch F. , Fürst A.
Published: December 2004

The structure and stereochemistry of some 11α‐ and 11β‐hydroxy‐9β, 10α(retro)‐steroids of the androstane, pregnane and corticoid series, obtained microbiologically, has been elucidated.
Die Struktur des Harpagosids. 2. Mitteilung über Iridoide
Authors: Lichti H. , von Wartburg A.
Published: December 2004

The structure and configuration of harpagoside, a bitter principle from the roots of Harpagophytum procumbens DC, have been elucidated by degradation reactions and NMR. spectra. The hitherto uncertain position of a secondary hydroxyl group could be assigned to C‐6 of the aglycone moiety. As earlier postulated, harpagoside (1) as well as its saponification product, harpagide (12), belong to a series of natural enol ethers known as iridoids.
Die Glykoside der Samen von Dregea volubilis (L.) BENTH. ex HOOK. 2. Mitt. Isolierung weiterer Drevogenine Glykoside und Aglykone, 277. Mitteilung
Authors: Sauer H. H. , Weiss Ek. , Reichstein T.
Published: December 2004

A total of fifteen substances were identified through thin‐layer chromatography, after mild acid hydrolysis of the chloroform extract from the seeds of Dregea volubilis (L.) BENTH. ex HOOK. Of these fifteen substances, eight (B, D, P, O; U, V, H and T) were isolated in crystalline form. Two of these were identical with the known genins drevogenin B (B) and drevogenin D (D). Drevogenin P (P) and the unknown substance O (probably a genin) were isolated for the first time. U proved to be identical with D‐cymarose, V with the biose U1 obtained from Asclepias lilacina, and H with (+)‐methyl‐pachybioside. T was not investigated (probably a sugar derivative).
Die Struktur der Drevogenine. 3. Mitteilung Struktur von Drevogenin A, B und D. Glykoside und Aglykone, 279. Mitteilung
Authors: Sauer H. H. , Weiss Ek. , Reichstein T.
Published: December 2004

The treatment of drevogenin P with isovaleryl chloride in pyridine gave an amorphous 3,12‐di‐O‐isovaleryl‐drevogenin P (4), which, on energetic acetylation, was converted into 3‐O‐isovaleryl‐drevogenin A (5). This could be isolated in crystalline form and was converted through mild alkaline hydrolysis into drevogenin A. Hence drevogenin A could be classified as 11‐O‐acetyl‐12‐O‐isovaleryl‐drevogenin P. Indirectly, the structure of drevogenin B could be deduced to be most probably that of 11α‐mono‐O‐acetyl‐drevogenin P. Some details of the earlier given structures [1] are corrected here. Drevogenin D has an 11α‐hydroxyl group.
Alloglaucotoxigenin, Strukturbestimmung Glykoside und Aglykone, 280. Mitteilung
Authors: Brandt R. , Stöcklin W. , Reichstein T.
Published: December 2004

The structure of alloglaucotoxigenin is shown to be that of 3β, 14β, 15β‐trihydroxy‐19‐oxo‐5α‐carda‐20:22‐enolide (IV) in the following way: The 19‐oxo group could be eliminated by reduction of the corresponding mercaptal. The structure of the resulting 3β, 14β, 15β‐trihydroxy‐5α‐carda‐20:22‐enolide, obtained in the acetylated form, was established through degradation and through partial synthesis by treatment of Δ14‐anhydro‐uzarigenin (XIII) with osmium tetroxide. The isomeric 3β,14α, 15α‐trihydroxy‐cardenolide was also formed in large quantities. The substance XI showed in its optical rotatory dispersion curve a positive, and substance XIV a negative COTTON effect.
Über die Herkunft der C‐Atome 22 und 23 im Strychnin. (Vorläufige Mitteilung)
Authors: Schlatter Ch. , Waldner E. E. , Schmid H. , Gröger D. , Stolle K. , Mothes K.
Published: December 2004

The results of 1‐[14C]‐sodium acetate feeding experiments with Strychnos nux vomica L. have shown that the C‐atoms 22 and 23 of strychnine are very probably acetate derived.
Sur 1'o‐chlorobenzylidène‐9‐fluorène
Authors: Hammer Wolfgang , Stauner Thomas , Chardonnens Louis
Published: December 2004

9‐o‐Chlorobenzylidenefluorene is obtained in good yield from fluorene and o‐chlorobenzaldehyde by condensation in methanol in the presence of sodium methoxide, while in ethanol containing sodium ethoxide 9‐o‐chlorocinnamylidenefluorene is formed as a by‐product. The latter is absent in the methanol condensation system.
Weitere Evidenz für die mikroskopische Gleichzeitigkeit des Bruches zweier Bindungen bei einer E2‐Reaktion: H‐Isotopeneffekte und Substituentenwirkungen bei der Reaktion von 2,2‐Diphenyläthyl‐benzolsulfonat mit Methoxid‐Ion
Authors: Willi A. V.
Published: December 2004

Second order rate constants are determined for the E2 reactions of 2,2‐diphenyl‐ethyl benzenesulfonates Ph2CxHCH2O · O2S–C6H4–X with CH3ONa in methyl cellosolve solution (xH = H or D, X = p‐CH3O, p‐CH3, H or p‐NO2). The HAMMETT ∂ values are of the same order of magnitude as those found in the first order solvolyses of methyl, ethyl or isopropyl benzenesulfonates. The primary deuterium isotope effects kH/kD are 5.27, 5.42 and 6.70 for X = p‐CH3O, H and p‐NO2. The ∂ values as well as the increase of kH/kD with introduction of p‐NO2 supply evidence for simultaneous CαO and CβH bond cleavages also in the E2 reactions of these compounds.
Die Redox‐Eigenschaften von Hydroxyanthrachinonsulfonsäuren II
Authors: Broadbent A. D. , Zollinger Hch.
Published: December 2004

The formation of intermediates in the reduction of two hydroxyanthraquinonesulphonic acids has been investigated by potentiometric and polarographic techniques. Acid‐base properties of molecules in the redox sequences have been deduced. In certain pH regions measurements were hindered by specific physical and chemical side‐reactions. Reduction in strongly alkaline solution only produces semiquinone free radical intermediates, but below pH 10 bimolecular quinhydrones may also be formed.
Die Reaktion von wässerigem Epichlorhydrin mit Hydroxid‐ und Phenolat‐Ionen
Authors: Konecny Jan
Published: December 2004

The reactions of epichlorhydrin with hydroxide and phenolate ions in water are shown to proceed by the same mechanism as the reactions of other epoxides with nucleophilic reagents, and not by direct attack on the halogen‐substituted carbon. The effect of solvent composition on the linear free energy correlations, like the equation of SWAIN & SCOTT, is discussed on the basis of recent literature data.
Schmelzreaktionen mit Aluminiumchlorid. I. Mitteilung. Über Kondensationsreaktionen von 1‐Aminoanthrachinon und 1 ‐Amino‐anthrachinon‐2‐sulfonsäure in der Pyridin‐Aluminiumchlorid‐Schmelze
Authors: Wick A. K.
Published: December 2004

The condensation of 1‐aminoanthraquinone to 1,1′‐diamino‐2,2′‐dianthraquinonyl in a melt of anhydrous aluminium chloride and moist pyridine has been reinvestigated. By a similar procedure under anhydrous conditions the sodium salt of 1‐aminoanthraquinone‐2‐sulfonic acid yielded the sodium salt of 4,4′‐diamino‐1,1′‐dianthraquinonyl‐3,3′‐disulfonic acid.
Über Struktur und Aktivität der den H2O2‐Zerfall katalysierenden Cu2+‐Komplexe. V. Vergleich der katalytischen Aktivität der Cu2+‐Komplexe isomerer β‐Hydroxythiophen‐Derivate. Mettallionen und H2O2, 9. Mitteilung
Authors: Petri S. , Sigel H. , Erlenmeyer H.
Published: December 2004

The catalytic properties in H2O2 decomposition of the Cu2+‐chelates of 2‐ Acetyl‐3‐hydroxy‐thiophene (I) and 3‐Acetyl‐4‐hydroxy‐thiophene (II) have been investigated. Evidence is given that the catalytic activity of the chelates is a function of the respective bond orders of the α, β (I) and β, β′ (II) thiophene bonds of the chelate ring.
Furyl‐ und Thienyl‐benzochinone, eine Gruppe neuer Farbstoffe
Authors: Baumann N. , Fumagalli S. , Weisgerber G. , Eugster C. H.
Published: December 2004

Es wird gezeigt, dass sich Furan, Thiophen und deren Alkylhomologe an negativ substituierte Chinone (Acetyl‐p‐benzochinon, Carbomethoxy‐p‐benzochinon, Cyano‐p‐benzochinon), Alkylbenzochinone sowie an Benzochinon in säurekatalysierter Reaktion addieren.
Synthèses dans ka série des bis‐indéno‐fluorènes II. Le dihydro‐10,15‐5H‐bis‐indéno [1, 2‐a;2′,1′‐i] fluorène
Authors: Chardonnens Louis , Hammer Wolfgang
Published: December 2004

The biangular bis‐indeno‐fluorene 10,15‐dihydro‐5H‐diindeno [l, 2‐a; 2′, 1′‐i]‐fluorene (XII) has been synthesised in 6 steps starting from 1‐(o‐carboxyphenyl)‐fluorenone (overall yield 21%). As an intermediate the 5,10,15‐trioxoderivative of XII and, accessorily, its 5,10‐dioxoderivative were also obtained.
Multiple Formen der Aldolase in Organextrakten der Ratte. Ü Aldolasen, 8. Mitteilung
Authors: Christen Ph. , Rensing U. , Schmid A. , Leuthardt F.
Published: December 2004

The aldolase activities of crude rat tissue extracts were separated by starch gel electrophoresis. Aldolase was located on the gel by a specific staining method. Nine bands of different electrophoretic mobility were stainable by this technique. Organ specific isoenzyme patterns could be demonstrated.
Etude des composés d'addition des acides de LEWIS XXVII. Composés d'addition de la cyclohexanedione‐1, 4 avec HgCl2, ZnCl2, et TiCl4
Authors: Rossetti G.‐P. , Susz B.‐P.
Published: December 2004

The adducts of cyclohexane‐1,4‐dione with HgCl2, ZnCl2, and TiCl4 have been prepared, and the IR. absorption spectra of the solid products studied. The lowering of the carbonyl frequency shows that the acceptor is linked by dative bonds to the carbonyl oxygen donors. This result confirms the cyclohexane‐1,4‐dione · HgCl2 structure which has been determined by X rays diffraction.
Note sur la préparation du monoester (triméthylammonio‐4‐butyl)‐sulfurique
Authors: Cherbuliez Emile , Jaccard S. , Mouzenidou R. , Rabinowitz J.
Published: December 2004

4‐Trimethylammoniobutyl hydrogensulfate, heated at 185°C under reduced pressure, yields 4‐trimethylammoniobutylsulfuric monoester. The rate of scission of this ester in alkaline medium grows with the concentration of the OH− ions.
Schwefel als Ligandatom in aromatischen Verbindungen III. Synthese einer Isothiazol‐Carbonsäure
Authors: Béringer Monique , Prijs B. , Erlenmeyer H.
Published: December 2004

In order to study the properties of aromatic sulfur as ligand atom and at the same time the similarity of the quinoline and the isothiazole ring, 3‐phenylisothiazole‐5‐carboxylic acid was synthetisized in different ways, e.g. using the 3‐phenylisothiazole—also unknown up to date—as starting compound.
Die Konstitution von Roridin. A Verrucarine und Roridine, 11. Mitteilung
Authors: Böhner B. , Tamm Ch.
Published: December 2004

The antibiotic roridin A (C29H40O9) yields on base catalysed hydrolysis verrucarol (10) and roridinic acid (13) (C14H22O7), a hitherto unknown dicarboxylic acid whose structure was proved by degradation. In roridin A 10 and 13 are united to form a macrocyclic diester to which structure 1 is assigned.
Die zerstörungsfreie, aktivierungsanalytische Bestimmung von Hauptbestandteilen in grösseren Probestücken (Anwendungsbeispiel: Münzen)
Authors: Wyttenbach A.
Published: December 2004

Es wird eine aktivierungsanalytische Methode zur zerstörungsfreien Bestimmung des Gehaltes an Silber, Kupfer und Gold von Münzen beschrieben. Wichtige Merkmale der Methode sind die Benutzung einer sich drehenden Bestrahlungseinrichtung, die Verwendung von Standards, welche den Proben hinsichtlich Form und Zusammensetzung möglichst entsprechen, und die Korrektur der gemessenen spezifischen Aktivitäten für Variationen im Ag‐Gehalt und in der Dicke der gemessenen Münzen. Die Methode wurde auf 370 Silbermünzen aus dem 15. und 16. Jahrhundert angewendet; der relative Fehler einer Einzelmessung an diesen Proben betrug ± 1,7%.
Isolierung von 2′‐Dehydroverrucarin A als Metabolit von Myrothecium roridum TODEex Fr., Gattungstyp bei FRIES. Verrucarine und Roridine. 13. Mitteilung
Authors: Zürcher W. , Tamm Ch.
Published: December 2004

From cultures of Myrothecium roridum TODE ex FRIES 2′‐dehydroverrucarin (1) was isolated. 1 is a genuin metabolite of the micro‐organism.