bluuebunny/crossref_metadata_2025_split huggingface dataset:
Détermination de constantes de stabilité de chélates par résonance magnétique nucléaire du proton
Authors: Merbach A. 
Published: December 2004

AbstractIn a solution containing an excess of two metal ions in regard to a ligand (e.g. NTA) a competitive equilibrium is established. The measure, by proton NMR. spectroscopy, of the individual concentrations of both chelates, and eventually of the free ligand, allows to determine the ratio of the stability constants of the two complexes. As an illustration the ratios of the stability constant of the 1:1 nitrilotriacetate chelates of Pb and Zn, respectively Mo and W, were determined.
Isochinoline. 1. Mitteilung. Über die Umlagerung von α, α‐Dialkylhomophtalimiden zu Derivaten des 1‐Chlor‐3, 4‐dialkyl‐isochinolins
Authors: Marquardt F.‐H. , Nair M. D. 
Published: December 2004

AbstractOn reinvestigation of the reaction of wet phosphorus oxychloride with α,α‐dimethylhomophthalimide, 1‐chloro‐3‐chloromethyl‐4‐methyl‐isoquinoline and 1‐chloro‐4‐chloromethyl‐3‐methyl‐isoquinoline were isolated as the main products (aside from some substances resulting from a redox disproportionation). The production of these two substances can be rationalized by assuming a mechanism in which the rearrangement product is a protonated derivative of 3,4‐dimethylene‐3, 4‐dihydroisoquinoline. With α, α‐diethyl‐homophthalimide the only isolated product was a derivative of 1‐chloro‐3, 4‐diethyl‐isoquinoline, with a chlorine atom in β‐position of one of the ethyl groups, while with α‐methyl‐α‐benzyl‐homophthalimide the isolated product was 1,3‐dichloro‐4‐methyl‐isoquinoline, i.e. elimination had taken place instead of rearrangement. Also these results are in agreement with the proposed mechanism.
Isochinoline. 2. Mitteilung [1]. Die Alkoholyse von 1‐Chlor‐3‐chlormethyl‐4‐methyl‐isochinolin und von 1‐Chlor‐4‐chlormethyl‐3‐methyl‐isochinolin
Authors: Marquardt F.‐H. 
Published: December 2004

AbstractMethanolysis and ethanolysis of 1‐chloro‐3‐chloromethyl‐4‐methyl‐isoquinoline yield respectively 3‐methoxymethyl‐4‐methyl‐isocarbostyril and 3‐ethoxymethyl‐4‐methyl‐isocarbostyril as main products, together with some 3‐chloromethyl‐4‐methyl‐isocarbostyril. By analogous reactions, 1‐chloro‐4‐chloromethyl‐3‐methyl‐isoquinoline yields 4‐methoxymethyl‐3‐methyl‐isocarbostyril and 4‐ethoxymethyl‐3‐methyl‐isocarbostyril.
Über die Reaktion von Propiolsäure und Propiolsäureester mit Cyclohexanon
Authors: Grob C. A. , Kaiser A. 
Published: December 2004

AbstractIn the presence of potassium t‐butoxide or potassium hydroxide, propiolic acid adds two molecules of cyclohexanone to form the isomeric seq‐cis‐ and seq‐trans‐7, 14‐Dioxa‐dispiro[5.1.5.2]pentadec‐15‐yliden‐acetic acids IIa and IIIa, respectively. Methyl propiolate and cyclohexanone react analogously in the presence of potassium t‐butoxide, yielding the corresponding esters. The structure of these condensation products follows from their physical properties and from degradation reactions to known compounds.
Cyclische gekreuzt‐konjugierte Bindungssysteme. XIV. 5,6‐Dimethyl‐1,2; 3,4‐dibenzo‐ und 5,6‐Dimethyl‐1,2,3,4‐tetraphenyl‐calicen
Authors: Prinzbach H. , Fischer U. 
Published: December 2004

AbstractThe syntheses of 5,6‐dimethyl‐1,2;3,4‐dibenzo‐ and 5,6‐dimethyl‐1,2,3,4‐tetraphenyl‐calicene and some of their physical and chemical properties are reported.
Cyclische gekreuzt‐konjugierte Bindungssysteme. XV. Cycloadditionen mit 5,6‐Dimethyl‐1,2;3,4‐dibenzo‐ und 5,6‐Dimethyl‐1,2,3,4‐tetraphenyl‐calicen
Authors: Prinzbach H. , Fischer U. 
Published: December 2004

AbstractCycloaddition reactions of 5,6‐dimethyl‐1,2,3,4‐dibenzo‐ and 5,6‐dimethyl‐1,2,3,4‐tetraphenyl‐calicene with diazo compounds, with dienes, and with dienophilic reagents are described.
Zur Kenntnis des elekrochemischen Verhaltens aufgedampfter Silberschichten. 2. Mitteilung
Authors: Hintermann H. E. , Trümpler G. 
Published: December 2004

AbstractDer erhöhte Gehalt an freier Enthalpie dünner im Vakuum aufgedampfter Schichten gegenüber demjenigen des Massivkörpers desselben Stoffes kann für Metalle elektrochemisch auf Grund der Negativierung des reversiblen Elektrodenpotentials und der Grösse seines Temperaturkoeffizienten erfasst werden. Am Beispiel des Silbers wird gezeigt, dass diese Abweichung allein verursacht wird durch eine Verminderung der Sublimationsenergie. Der Effekt dieser Verminderung der Sublimationsenergie auf die Bindungsfestigkeit von Atomen auf Oberflächen wird anhand der KOSSEL‐STRANSKI'schen Theorie diskutiert. Es wird auch gezeigt, dass bei Kenntnis des Betrages der Potentialnegativierung und desjenigen des Temperaturkoeffizienten in gewissen Fällen die Korngrösse dünner Schichten abgeschätzt werden kann.
Recherches sur les arômes. 15e communications [1]. Sur l'arôme du cacao II
Authors: Stoll M. , Dietrich P. , Sundt E. , Winter M. 
Published: December 2004

Abstract4‐Methyl‐5‐(β‐hydroxyethyl)‐thiazole has been isolated from cocoa. This practically inodorous substance is accompanied by trace amounts of its dehydration product, 4‐methyl‐5‐vinyl‐thiazole, possessing a strong nut‐like odour. The RMN. and MS. spectra of the latter are described.
Über Inhaltsstoffe des Haschisch. 3., vorläufige Mitteilung. Umwandlung von (−)‐Δ6,1‐3,4‐trans‐Tetrahydrocannabinol in (−)‐Δ1,2‐3,4‐trans Tetrahydrocannabinol
Authors: Petrzilka T. , Sikemeier C. 
Published: December 2004

AbstractSuccessive treatment of (−)‐Δ6,1‐3,4‐trans‐tetrahydrocannabinol with hydrochloric acid/zinc chloride and potassium‐t‐amylate gives (−)‐Δ1,2‐3,4‐trans‐tetrahydrocannabinol in quantitative yield.
Die Glykoside der Wurzeln von Glossostelma carsoni (N. E. BR.) BULLOCK. Glykoside und Aglykone, 297. Mitteilung
Authors: Reichstein P. , Kaufmann H. , Stöklin W. , Reichstein T. 
Published: December 2004

AbstractPentacyclic triterpenes, sterols, cardenolides and pregnane derivatives could be identified in extracts from roots of Glossostelma carsoni (N.E. BR.) Bullock. From the first group, the following substances could be isolated in crystalline form: β‐amyrin, lupeol, their 3‐O‐acetyl derivatives, and 3‐O‐isovaleryl‐β‐amyrin. The sterols were isolated in the form of two mixed but crystalline fractions. The less polar fraction was shown to be a mixture of β‐sitosterol, campesterol, stigmasterol, and cholesterol (stereoisomers are not excluded); the more polar fraction is probably a mixture of monohydroxy derivatives of the four above mentioned sterols.
Die Glykoside der Wurzeln von Kanahia laniflora (FORSSK.) R. BR. 2. Mitteilung: Struktur von Kalanosid‐H und Kalanosid‐K Glykoside und Aglykone, 300. Mitteilung
Authors: Kapur B. M. , Allgeier H. , Reichstein T. 
Published: December 2004

AbstractThe total acidic hydrolysis of kalanoside‐H and kalanoside‐K yielded 12‐O‐acetyl‐17‐isolineolon as well as three sugars: oleandrose, canarose and digitoxose. From partial hydrolysis and UV., IR. and NMR. spectral data, it could be concluded that kalanoside‐H is probably a trisaccharide glycoside having the partial formula 1a or 1b, and similarly that kalanoside‐K has probably the partial formula 2.
IR.‐spektroskopische Untersuchungen in der Chinophtalon‐Reihe
Authors: Kehrer F. , Niklaus P. , Manukian B. K. 
Published: December 2004

AbstractEs wurden einige bekannte Chinophtalone z. T. auf modifizierte Art hergestellt und IR.‐spektroskopisch mit einer Anzahl neuerer, chinophtalon‐artig gebauter Farbstoffe aus der Reihe der Pyromellitsäure, Naphtalin‐ und Perylen‐tetracarbonsäure verglichen.
Differenzierung sämtlicher raumisomerer 6‐Desoxyhexosen, 3‐O‐Methyl‐6‐desoxyhexosen und 6‐Desoxyhexulosen. Desoxyzucker, 42. Mitt. [1]
Authors: Kaufmann Heinz , Mühlardt P. , Reichstein T. 
Published: December 2004

AbstractThe separation of isomeric sugars with the aid of thin‐layer and paper chromatography, as well as paper electrophoresis, has been reported. Under certain fixed experimental conditions and by a combination of the above mentioned methods, it has been possible to differentiate with certainty between all theoretically possible 6‐deoxyhexoses, 3‐O‐methyl‐6‐deoxyhexoses and 6‐deoxyhexuloses.
Komplexone XLI. Die Komplexe des einwertigen und des dreiwertigen Thalliums mit einigen Polyaminocarboxylaten
Authors: Anderegg G. , Bottari E. 
Published: December 2004

AbstractThe stability constants of the complexes of the monovalent and the trivalent thallium ion with different polyaminocarboxylate ions have been determined using pH and redox measurements.
Ternäre Komplexe in Lösung IV. Einfluss von 2,2′‐Bipyridyl auf Stabilität und Acidität des Cu2+‐Adenosin‐5′‐monophosphat‐N(1)‐oxid‐1:1‐Komplexes
Authors: Sigel Helmut , Prijs Bernhard 
Published: December 2004

AbstractThe ternary Cu2+−2,2′‐bipyridyl‐adenosine‐5′‐monophosphate‐N(1)‐oxide complex was investigated and compared with the binary Cu2+‐adenosine‐5′‐monophosphate‐N(1)‐oxide complex (I) (cf. [2]). In both complexes Cu2+ is bound to the o‐amino‐N‐oxide group of adenosine‐5′‐monophosphate‐N(1)‐oxide (HL). The stabilities of the complexes monoprotonated at the phosphate group are of the same order: log K = 11,20, and log K = 11,19. The acidity constants for the deprolonation of the phosphate group in these complexes are slightly different (pK = 5,55, and pK = 5,88), but as expected both values are lower than the corresponding value pK = 6,12 of the ligand.
Die Strukturen der mittleren Ringverbindungen. XIV. Struktur des Silbernitrat‐trans‐Cyclodecen‐Addukts
Authors: Ganis Paolo , Dunitz J. D. 
Published: December 2004

AbstractCrystals of the AgNO3‐trans‐cyclodecene adduct are orthorhombic, a = 5,47, b = 14,69, c = 26,73 Å, space group Pbcn, with 4 formula units AgNO3·(C10H18)2 in the unit cell. The structure has been solved by the heavy‐atom method and refined by full‐matrix least‐squares analysis of three‐dimensional intensity data. The conformation of the trans‐cyclodecene molecule has features in common with that of the cyclodecane ring, but the trans double bond is twisted about 40° from planarity. This deformation must contribute substantially to the strain‐energy of trans‐cyclodecene. The dependence of the twist‐energy on the twist‐angle is discussed.
Sythese von α und β‐Sinensal
Authors: Bertele E. , Schudel P. 
Published: December 2004

Abstractβ‐Sinensal (2,6‐dimethyl‐10‐methylene‐dodeca‐2,6,11‐trienal) was synthesized from the diene‐aldehyde 5. This was converted into the trans‐ and cis‐triene‐aldehydes 16 and 17, which were condensed with the phosphorane 18 to give the corresponding two geometrical isomers (3 and 19) of β‐sinensal.
Beitrag zur Synthese von Tetracenchinonen
Authors: Winkler R. E. 
Published: December 2004

Abstract1,4‐Dihydroxyanthraquinones are transformed into the corresponding chlorohydroxy‐ana‐anthraquinone dienophiles, which are subjected to Diels‐Alder addition with 1,3‐dienes. The adducts formed are dehydrogenated to known and to new hydroxynaphthacene quinones.
Stereoselektive Umwandlung von [2.2.2.2.2.2]Metacyclophan in ein all‐trans‐Hexaen
Authors: Burri K. , Jenny W. 
Published: December 2004

AbstractStarting from [2.2.2.2.2.2]metacyclophane the synthesis of [2.2.2.2.2.2]metacyclophane‐all‐trans‐hexaene via dodecabromo‐[2.2.2.2.2.2]metacyclophane is described. The structure of the new ring system was confirmed by UV.‐, IR.‐, NMR.‐, and mass spectra analyses.
Une fonction d'onde autocohérente (self‐consistent) sans restriction de symétrie pour 1′état X3Π de la molécule BN
Authors: Masse J. L. , Masse‐bärlocher M. 
Published: December 2004

AbstractWe give the self‐consistent wave functions for the BN molecule in the …(5 σ) (1 π+)2 (1 π−), X3 Π state. These wave functions are obtained as linear combinations of SLATER orbitals of the atoms. In this openshell case the π+ and π− orbitals belonging to the same symmetry species but to different subspecies are allowed to vary independently. Their coefficients are found rather different from one another; this seems to mean that the effect of the usual symmetry restriction could be relatively important in such cases.
Recherches sur la formation et la transformation des esters LXXVIII. Sur la réaction de l'isothiocyanate d'o‐méthoxycarbonyl‐phényle avec des diamines et l'hydrazine, et sur la cyclisation de quelques N‐phényl‐N′‐hydroxyalcoyl‐thio‐urées
Authors: Cherbuliez Emile , Willhalm B. , Jaccard S. , Rabinowitz J. 
Published: December 2004

Abstract1‐Amino‐2‐dimethylamino‐ethane and 1‐amino‐3‐dimethylamino‐propane react with o‐methoxycarbonylphenyl isothiocyanate (I) to yield the corresponding 3‐(ω‐dimethylaminoalkyl)‐2‐thiono‐1,2,3,4‐tetrahydroquinazolin‐4‐ones (V). The tertiary amino group of V is quaternized to the corresponding ammonio derivative VI when treated with methyl iodide in methanol.
Welkstoffe und Antibiotika 37. Mitteilng [1]. Zwischenprodukte zur Synthese von Verbindungen der Lycomarasin‐Reihe aus Glycin und L‐Serin
Authors: Hardegger E. , Szabo F. , Liechti P. , Rostetter Ch. , Zankowska‐Jasinska W. 
Published: December 2004

AbstractAus Glycin und L‐Serin, die durch mehrere, offenbar noch unbekannte, einfache Derivate charakterisiert wurden, konnten verschiedene für die Synthese von Verbindungen der Lycomarasmin‐ und der Aspergillomarasmin‐ und der Aspergillomarasmin‐B‐Reihe erfolgversprechende Zwischenprodukte (z. B. IIIc, VII, VIII) hergestellt werden.
BECKMANN‐Umlagerung und Fragmentierung. II. Teil. Versuche zur 7‐Zentren‐Fragmentierung von γ‐Aminoketoximen. Fragmentierungsreaktionen, 19. Mitteilung
Authors: Fischer H. P. , Grob C. A. 
Published: December 2004

AbstractThe occurrence of so‐called synchronous 7‐centre‐fragmentation has been excluded for γ‐amino‐ketoxime derivatives NCCCCNX. Fragmentation may occur, however, by another route.Reaction rates of the p‐toluenesulfonates of (4‐quinuclidinyl)‐methyl‐ketoxime (10b) and (3β‐tropanyl)‐methyl‐ketoxime (14b) in 80% ethanol and the resulting products have been determined. Whereas the latter γ‐aminoketoxime underwent quantitative BECKMANN rearrangement to 3β‐acetylaminotropane (29), the former yielded 3% fragmentation products besides rearranged 4‐acetylamino‐quinuclidine (13).A kinetic study reveals that both 10b and 14b react via the rearranged nitrilium ions 12a and 16a, respectively. In the case of the N‐(4‐quinuclidinyl)‐acetonitrilium ion (12a) 5‐centre‐fragmentation competes with hydration to the amide 13.
Über siliciumaromatische Verbindungen I. Trimethylsilylphtalsäuren und davon abgeleitete Farbstoffe
Authors: Hopff H. , Gallegra P. 
Published: December 2004

AbstractThe 3‐ and 4‐trimethylsilyl‐phthalic anhydrides have been prepared by oxidation of the corresponding o‐xylenes and converted into dyestuffs of the type of phthalocyanines, phthaleins and chinophthalones.
Zur Metallion‐Komplexbildung fünfgliedriger α‐Carboxy‐Heterocyclen
Authors: Erlenmeyer H. , Griesser R. , Prijs B. , Sigel H. 
Published: December 2004

AbstractThe stability constants of some 1:1 Me2+‐complexes of the following five‐membered heterocyclic carboxylic acids have been measured in 50 perc. aqueous dioxane (I = 0,1; t = 25°): thiophene‐2‐ (I), 3‐phenylisothiazole‐5‐ (II), tetrahydrothiophene‐2‐ (III), furan‐2‐ (IV), pyrrole‐2‐ (V), and tetrahydrofuran‐2‐carboxylic acid (VI) (table 1 and 2).A comparison of the stability constants of the Cu2+‐complexes of acetic acid (VII), benzoic acid (VIII), m‐chlorobenzoic acid (IX), p‐nitrobenzoic acid (X), and chloroacetic acid (VI) shows that the heterocyclic S and O atoms coordinate with Cu2+, i.e. Cu2+ chelates (structure XII) are formed (Figure 1).NMR. spectra (Fig. 2) give evidence for the coordination of the «aromatic» S atom in the Cu2+ complexes of thiophene‐2‐carboxylic acid (I), i.e. at least a part of the complexes are chelates. The NMR. spectra of furan‐2‐carboxylic acid (IV) gave no unequivocal results; in the case of pyrrole‐2‐carboxylic acid (V) the interaction between Cu2+ and the NH‐group is very small (Fig. 4), i.e. a simple carboxylic acid complex is formed.
ESR.‐Spektrum des Radikal‐Anions des [18]Annulen‐1,4;7,10;13,16‐trisulfids
Authors: Gerson F. , Heinzer J. 
Published: December 2004

AbstractThe ESR spectrum of the radical‐anion of [18]annulene‐1,4;7,10;13,16‐trisulfide (ATS) has been recorded. Its analysis yields six coupling constants for pair of equivalent protons indicating the lack of a threefold symmetry axis. A provisional assignment has been attempted which is based on calculated spinpopulations. Conformations of ATS and ATS⊖ are shortly discussed.
Die NO‐katalysierte Isomerisierung von 2,6‐Dimethyl‐1, trans‐3,6‐heptatrien in der Gasphase
Authors: Egger Kurt W. 
Published: December 2004

AbstractThe nitric oxide catalyzed isomerization of 2,6‐dimethyl‐1, trans‐3,6‐heptatriene has been measured for temperatures ranging between 209.1 and 311.4°C. The reaction follows second order kinetics and appears to be truly homogeneous. The main products are 1.5.5‐trimethyl‐1.3‐cyclohexadiene (1,5,5‐TCHD), 2.6.6‐trimethyl‐1.3‐cyclohexadiene (2,6,6‐TCHD) and 2.6‐dimethyl‐1, trans‐3.5‐heptatriene. Only traces of the cisoid structures of the linear trienes are detected, in equilibrium with the trans‐isomers, which is attributed primarily to a loss of conjugation energy in the cis‐isomer. The least squares regression analysis yields for the overall rate constants the ARRHENIUS equation log k (1/mole‐s) = (7.78 ± 0.14) − (25340 ± 350) /2.303 RT (°K). The analysis of the rate data shows that the reaction proceeds via a NO catalyzed geometrical isomerization followed by a thermal intramolecular 1,5‐hydrogen transfer and subsequent cyclization of the 1, cis‐3. 5‐triene structure. No competition with abstraction of the «triallylic» hydrogen by NO is observed.
Farbstoffe aus Naphtazarin‐1,3‐Dien‐Addukten
Authors: Winkler R. E. 
Published: December 2004

AbstractThe amination and oxidation of naphthazarin‐diene adducts leads to known and to new anthraquinone and tricyclic naphthazarin dyestuffs and their intermediates. The new products allow extension of the hitherto known (especially green) color range of dyes. The mechanism of the reaction is discussed.
Über Pterinchemie. 25. Mitteilung [1]. Synthesen von Pterinen und Lumazinen aus α‐Oxo‐β‐hydroxy‐Derivaten und den entsprechenden Pyrimidinen
Authors: Viscontini M. , Leidner H. 
Published: December 2004

AbstractDie Synthesen von 6,7‐Diphenyl‐5,6‐dihydro‐, 6,7‐Diphenyl‐7,8‐dihydro‐ und 6,7‐Diphenyl‐5,6,7,8‐tetrahydro‐lumazin werden beschrieben. Alle Produkte sind jenen der entsprechenden Pterinreihe sehr ähnlich. Eine allgemeine Theorie der Pterin‐ und Lumazin‐Synthesen, ausgehend von Aminopyrimidinen und α‐Oxo‐β‐hydroxy‐Derivaten, die schon von WEYGAND postuliert wurde, wird bestätigt und erweitert.
Zur Theorie grosser Molekeln. I. Revision der Grundlagen der Quantenchemie
Authors: Primas H. 
Published: December 2004

AbstractThe present day quantum chemistry is mathematically based on von NEUMANN'S formulation of quantum mechanics and therefore not able to deal correctly with anomal quantum states. A general theory of large molecules and large molecular systems has to be founded on quantum field theory allowing for inequivalent irreducible representations. It is proposed to formulate quantum chemistry in the framework of the B*‐algebra of the observables. The paradox of molecular systems having an infinite number of degrees of freedom is discussed, and the possible significance of anomal molecular quantum states for molecular biology is pointed out.
Partialsynthese von 6‐Methyl‐9‐ergolen‐8β‐essigsäure und einiger ihrer Derivate. 68. Mitt. über Mutterkornalkaloide [1]
Authors: Troxler F. , Stadler P. A. 
Published: December 2004

AbstractThe transformation of lysergic acid and 1‐methyllysergic acid into their homologous acids, i.e. 6‐methyl‐9‐ergolen‐8β‐acetic acid and 1,6‐dimethyl‐9‐ergolen‐8β‐acetic acid, and the synthesis of some of their derivatives are described.
BECKMANN‐Umlagerung und Fragmentierung; V. Teil Mechanismus der 7‐Zentren‐Fragmentierung von 1‐Oxo‐5‐oximino‐9‐methyl‐trans‐decalin. Fragmentierungsreaktionen, 22. Mitteilung
Authors: Grob C. A. , von Tschammer H. 
Published: December 2004

AbstractThe reaction rates of heterolytic fragmentation of 5‐(p, ‐toluenesulfonyloxyimino)‐1‐oxo‐9‐methyl‐trans‐decalin (1), induced by sodium hydroxide in 80% ethanol and by sodium ethoxide in 100% ethanol, has been determined. The reaction of the oxime tosylate 1 with sodium ethoxide is first order with respect to both reactants. A similar base‐dependence is observed in the reaction of the oxime tosylate 1 with sodium hydroxide.These results are explained in terms of an addition‐fragmentation mechanism. This involves reversible addition of NaOH or NaOC2H5 to the carbonyl group of the oxime tosylate 1 and concerted fragmentation of the addition compounds 5a and 5b, yielding 9‐cyano‐6‐methyl‐trans‐non‐5‐enoic acid (4a) and the corresponding ethyl ester 4b, respectively.These reaction appear to be the first cases of concerted and stereospecific 7‐centre fragmentation.
Fluorénacènes et fluorénaphènes Synthèses dans la série des indéno‐fluorènes XII [1]. Méthyl‐11‐dihydro‐10, 12‐indéno [2, 1‐b] fluorène
Authors: Chardonnens Louis , Maritz Fritz , Stauner Thomas 
Published: December 2004

AbstractLa bis‐cyclohexylation du m‐xylène selon Friedel‐Crafts se fait, pour une bonne part, dans les positions 4 et 6; l'aromatisation du produit obtenu donne en effet le diphényl‐4, 6‐xylène‐1, 3 connu. La bis‐cyclohexylation de l'hémimellitène se fait de même, du moins en partie, en 4 et 6; une série de transformations (aromatisation, oxydation, cyclisation et réduction) conduit au méthyl‐11‐dihydro‐10, 12‐indéno [2, 1‐b] fluorène ou isophatalacène d'Errera.
Über die Synthese des Pronuciferins und einiger weiterer Proaporphin‐Alkaloide. 6. Mitteilung über natürliche und synthetische Isochinolinderivate
Authors: Bernauer Karl 
Published: December 2004

AbstractTotal syntheses of the proaporphine alkaloids pronuciferine (6), stepharine (19), amuronine (7), amuroline (24) and of some derivatives thereof, all as racemates, are described.
Étude des spectres infrarouges de divers dialcoyl‐diméthoxy‐stannanes
Authors: Maire Jean‐Claude , Ouaki Raymonde 
Published: December 2004

AbstractThe infrared absorption spectra of some dialkyldimethoxystannanes have been investigated in the 400–1500 cm−1 region. The bands associated with vs(SnC2) and vs(SnO2) vibrations have been found at 510–521 cm−1 and 466–475 cm−1. The group of bands between 560 and 620 cm−1 is assigned jointly to va(SnC2) and va(SnO2) vibrations. v(CO) of the methoxy groups linked to tin appears at 1064–1068 cm−1.
Die Fraktionierung von Serumproteinen mit flüssigen Phasenpaaren. 4. Mitteilung [1]. Die Gegenstromfraktionierung von γ‐Globulinen
Authors: Tavel P. V. 
Published: December 2004

Abstractγ‐Globuline sind mit fast‐kritischen flüssigen Phasenpaaren aus Diäthylenglykol‐diäthyläther, Wasser, Magnesiumsulfat und Dinatriumglycerophosphat bei + 1° C mittels multiplikativer Gegenstromverteilung fraktioniert worden. Der mittlere Verteilungskoeffizient des γ‐Globulingemischs ist vom pH und vom Mengenverhältnis Magnesiumsulfat/Dinatrium‐glycerophosphat abhängig. Er lässt sich auf einen für die multiplikative Verteilung günstigen Wert einstellen. Diese wurde in einer Verteilzentrifuge vorgenommen, mit welcher die Phasen nach jeder Gleichgewichtseinstellung rasch getrennt werden können. Mit 40 Gefässen wurden über 200 Verteilungsschritte ausgeführt. Das γ‐Globulin konnte reproduzierbar in eine Reihe von Fraktionen zerlegt werden, deren Verteilungskoeffizienten stetig bis über das 10fache ansteigen. Die Verteilungskoeffizienten entsprechen den für die Prozesse berechneten Werten. Die wegen ihrer Verteilungskoeffizienten eindeutig verschiedenen Fraktionen unterscheiden sich aber weder in der Ultrazentrifuge noch immuno‐elektrophoretisch; d.h. ihre elektrophoretische Beweglichkeit und ihr Verteilungskoeffizient stellen im gegebenen Phasenpaar zwei unabhängige Parameter dar. Die Gegenstromverteilung zerlegt das Gemisch nach anderen Eigenschaftskriterien als die Elektrophorese und die Ionenaustausch‐Chromatographie. Die Fraktionen eines bovinen Antisalmonellen‐Colostrum‐γ‐Globulins zeigten ausser einer Randfraktion keinen Unterschied in ihren Antikörper‐Titern.