bluuebunny/crossref_metadata_2025 huggingface dataset:
Zur Kenntnis des Isostrychanols. 45. Mitteilung über Calebassen Alkaloide
Authors: Weissmann Ch. , Schmid H. , Karrer P.
Published: December 2004

Das in einer früheren Mitteilung beschriebene Isostrychanol wurde näher untersucht. Für die Aufklärung seiner Konstitution (IIIa bzw. IIIb) war wichtig, dass es sich zu Dihydro‐isostrychanol reduzieren liess, dessen Eigenschaften nur mit Formel V vereinbar sind. Von ihm konnte ein Tritosylderivat VI dargestellt werden. Isostrychanol bildet in CH3OHHCl einen Methyläther IV. Beim Erhitzen des Isostrychanols mit Ameisensäure bildet sich, wahrscheinlich über ein N‐Formylderivat, eine neue Verbindung, ein Dihydrochinolinderivat der Formel VII (Chinolinstrychenon). Dieses wird durch Lauge in das Anion VIIb, durch Säure in das Kation VIIa verwandelt.
Etude de quelques énolacylates diéniques et leur utilisation dans une méthode générale de synthèse d'anhydrides phtaliques substitués
Authors: Blanc Pierre‐Yves
Published: December 2004

1. La préparation, les spectres d'absorption UV. et le comportement à l'hydrogénation catalytique de plusieurs composés diéniques conjugués, obtenus par acylation de la forme énolique d'aldéhydes et cétones non saturés en α,β, ont été étudiés.
Sur une δ‐lactono‐épimérase I. Préparation et propriétés
Authors: Posternak Th. , Waegell P.
Published: December 2004

A partir de trois souches d'Acetobacter suboxydans on obtient des extraits acellulaires contenant un ferment non particulaire qui permet l'interconversion de la trihydroxy‐ 2,3/4‐cyclohexanone et de la trihydroxy‐3/2,4‐cyclohexanone. Les mêmes préparations épimérisent d'une maniére réversible la D‐glucono‐δ‐lactone en D‐mannono‐ δ‐lactone. Cette δ‐lactono‐épimérase de pH optimum 5,1–5,2 est activée par les ions Zn++ et Mn++; son action est limitée par l'hydrolyse spontanée des deux lactones, car le ferment n'agit pas sur les acides correspondants. Une méthode polarimétrique a été utilisée pour le dosage des produits d'épimérisation.
Etude théorique des équilibres chimiques
Authors: Fliszár Sándor
Published: December 2004

En considérant un systéme chimique gazeux AB ⇋A + B homogène, à l'équilibre, comme un ensemble de parcelles de volume fini, on déduit la condition de conservation de l'homogénéité du systéme et, implicitement, la condition d'équilibre ‐ au moyen d'un bilan matériel pour chacune de ces parcelles.
Reaktivität von Koordinationsverbindungen. VI. Zum Mechanismus der Autoxydation von Eisen(II)‐Chelaten
Authors: Kaden Th. , Fallab S.
Published: December 2004

The autoxidation of Fe2+ in the presence of the chelating agents 1,2‐dihydroxybenzene‐3,5‐disulfonic acid and 1,8‐dihydroxynaphtalene‐3,6‐disulfonic acid has been studied. The reaction of the chelates FeIIHZ and FeIIZ, respectively, with O2 determines the over all rate of FeIII formation.
Die Ermittlung der Löslichkeit von Eisen(III)‐hydroxiden mit 59Fe II Der Zustand kleinster Mengen Eisen(III)‐hydroxid in wässeriger Lösung
Authors: Lengweiler H. , Buser W. , Feitknecht W.
Published: December 2004

The state of iron(III)‐hydroxide in aqueous solutions of very low concentrations has been investigated using 59Fe as tracer. From very dilute solutions (10−5 M, 10−7 M and 10−9 M) brought to a pH between ∼ 5–12 practically all the iron hydroxide can be sedimented by ultracentrifugation. The particle size varies with the pH, being biggest at a pH ∼ 6.5 and showing a rather wide range of distribution at a higher pH. In the acid (pH 3–5) and the alkaline region (pH 12–14) the dissolved amount of FeIII‐hydroxide agrees satisfactorily with the values calculated using the solubility‐product and the constants of hydrolysis. In the precipitate two kinds of colloidal particles, spindel shaped α‐FeOOH and irregular aggregations of amorphous hydroxide particles, can be distinguished under the electron microscope.
Substituenteneffekte in kernmagnetischen Protonenresonanzspektren von substituierten Benzolen
Authors: Diehl P.
Published: December 2004

Substitution effects in proton magnetic resonance spectra of meta‐ and paradisubstituted benzene are shown to be additive at low concentration in hexane. The absolute values of the effects are measured in meta‐disubstituted benzene. Substitution effects in paradisubstituted benzene are separated by substitution of the values thus obtained and are used to predict chemical shifts. In orthodisubstituted and in polysubstituted benzene as well as in paradisubstituted benzene with mesomeric interaction new substitution effects are found and discussed. Correlations of substitution effects with Hammett‐parameters are given. An electrostatic theory of substitution effects is shown to be a good approximation as long as the resonance contribution to the shifts is low.
Genaue Bestimmung kleiner Dampfdruckunterschiede isotoper Verbindungen II. Der 13C/12C‐Isotopieeffekt in Tetrachlorkohlenstoff und in Benzol
Authors: Narten Alfred , Kuhn Werner
Published: December 2004

Es wird eine Methode zur Bestimmung von Dampfdruckunterschieden isotoper Verbindungen beschrieben, welche es gestattet, auch sehr kleine Trennparameter mit grosser Genauigkeit zu bestimmen. Nach dieser Methode wurden die 13C/12C‐Isotopieeffekte im Dampf‐Flüssigkeits‐Gleichgewicht für CCl6 und C6H6 gemessen. Vorzeichen und Temperaturverlauf der Trennparameter werden anhand der BAERTSCHI‐KUHN Theorie (1R.‐Anteil der Dispersionswechselwirkung als Ursache für grössere Flüchtigkeit der schweren Molekelspezies) diskutiert.
Über Methinfarbstoffe aus Tetrahydroxanthyliumsalzen I
Authors: Stevens Wilhelm , Wizinger Robert
Published: December 2004

Methylcarbeniumsalze (z. B. α‐Methylcycloimoniumsalze) kondensieren sich normalerweise mit Orthoameisensäureester im Verhältnis 2 : 1 zu symmetrischen Trimethinen. Es wird nun gefunden, dass bei einigen α‐Methylbenzopyryliumsalzen, in welchen durch eine aliphatische Kette ein Ringschluss von der α‐standigen Methylgruppe nach dem β‐C‐Atom eingeführt ist, die Kondensation in der Stufe 1:1, also in der ω‐Aldehydstufe stehen bleibt. Gefasst werden die ω‐Aldehydsalze aus Tetrahydroxanthyliumsalz,3‐Methyl‐tetrahydroxanthyliumsalz, Tetrahydronaphto‐xanthyliumsalz und 3‐Methyl‐tetrahydronaptoxanthyliumsalz. Aus beiden erstgenannten lassen sich unter energischen Bedingungen symmetrische Methinfarbstoffe darstellen, aus den beiden letzteren aber nicht mehr. Die neuen ω‐Aldehyde ermöglichen die Synthese zahlreicher unsymmetrischer Pyrylomethine.
Die diamagnetische Anisotropie der CC‐Einfachbindung. Eine Abschätzung auf Grund der Protonenresonanzspektren von 5α‐ und 5β‐Androstan
Authors: Zürcher R. F.
Published: December 2004

Based on the proton NMR spectra and the known geometry of rings A and B of 5α‐ and 5β‐androstane an equation has been derived for , the anisotropy of the molar diamagnetic susceptibility of the CC single bond, that is
equation image
where Δ is the analogous quantity for the CH bond. Assuming values between the range for Δ becomes .
Über 2,4‐Diphenyl‐5, 6, 7, 8‐tetrahydrobenzopyrylo‐cyanine. II Unsymmetrische Cyanine
Authors: Kirner Hans‐Dieter , Wizinger Robert
Published: December 2004

Letztendlich ausgehend von 2,4‐Diphenyl‐tetrahydrobenzopyryliumsalz werden unsymmetrische Cyanine aufgebaut, welche einerseits einen Pyryliumring, andererseits einen Stickstoffheterocyclus als Endglieder tragen. Auch ein unsymmetrisches Dipyrylo‐dien‐cyanin mit α,α‐ständiger Methinkette wird beschrieben; die Darstellung höherer Vinylenhomologen dieses Typus gelang merkwürdigerweise bisher nicht.
Recherches sur la formation et la transformation des esters XXIX. Sur la vitesse d'hydrolyse des monoesters phénylphosphoniques
Authors: Cherbuliez Emile , Hunkeler F. , Rabinowitz J.
Published: December 2004

The rate of hydrolysis of phenylphosphonic monoesters at different pH values (0,4,5 and 14), at 100° and in 0,1M solutions, is studied.
Recherches sur la formation et la transformation des esters XXX. Sur l'action de l'oxyde phénylphosphonique sur les amines et les amino‐alcools
Authors: Cherbuliez Emile , Baehler Br. , Rabinowitz J.
Published: December 2004

The reaction of phenylphosphonic oxide with amines and amino‐alcools is described. Under appropriate conditions this reaction yields respectively the corresponding phosphonic mono‐amides and mono‐esters.
Über Steroide und Sexualhormone. 224. Mitteilung. Die Umsetzung von 3α‐Hydroxy‐5β‐Steroiden mit Blei(IV)‐acetat
Authors: Immer H. , Mihailović M. Lj. , Schaffner K. , Arigoni D. , Jeger O.
Published: December 2004

Treatment of different 3α‐hydroxy‐5β‐steroids with lead tetraacetate leads to the formation of 3α, 9‐oxido derivatives in yields that are strongly dependent on the nature of ring C. The significance of these reactions with regard to the mechanism of the lead tetraacetate oxidation of monohydric alcohols is discussed.
Cyclisierung des 2‐Methyl‐hepten‐(2)‐on‐(6)‐oxims zu neuen Pyrrolinderivaten
Authors: Wagner‐Jauregg Theodor , Roth Max
Published: December 2004

Durch Behandlung von 2‐Methyl‐hepten‐(2)‐on‐(6)‐oxim (I) mit Zinkstaub in Eisessig erhält man 2‐Methyl‐5‐isopropyl‐pyrrolin‐(I) (IIA) und daraus durch katalyt. Hydrierung 2‐Methyl‐5‐isopropyl‐pyrrolidin (III); dieses lässt sich auch durch katalyt. Reduktion von 2‐Methyl‐5‐isopropyl‐pyrrolin‐(5) (Vb) oder von 2‐Methyl‐5‐isopropyl‐pyrrol (VIII) darstellen. Die beobachtete Ringschlussreaktion des offen‐kettigen Oxims I verläuft analog derjenigen cyclisch substituierter, δ‐ungesättigter Acetonderivate, deren Doppelbindung sich in einem 5‐ oder 6‐Ring befindet.
Über das elektromotorische Verhalten von Elektrodengläsern III Messungen an Elektrodengläsern in Essigsäure
Authors: Wegmann Dorothée , Escarfail J. P. , Simon W.
Published: December 2004

The glass electrode is shown to respond to the concentration of protonated acetic acid within the ranges 0 to 0.50% (w/w) water and about 10−4 to 10−1M perchloric acid. There exists a linear relationship between the alkaline error of glass electrodes and the logarithm of their potential drift in acetic acid. Some electrode glasses that are specially well suited for measurements in acetic acid are mentioned.
Inkorporation von 14C‐Acetat in die Fettsäuren der Cerebroside des Rattengehirnes
Authors: Bernhard Karl , Hany A. , Hausheer L. , Pedersen W.
Published: December 2004

Acetate injected into rat brains is rapidly oxidized, a small part, however, is incorporated into the brain lipids. Already after six hours the total fatty acids show a maximum activity, which is highest for palmitic acid. As there is practically no more acetate available after this time, we have to explain later changes of activity as transformations. Cerebrosides were isolated from rat brains 3 and 72 hours after injection. Their fatty acids were separated by gas‐chromatography. Palmitic acid had a high initial activity, acids with 18, 20, 22, 23 and 24 C‐atoms at the beginning had a low one, which increased remarkably later on. The conclusion may be drawn that palmitic acid has a rapid turnover in brain. It is the precursor for the higher saturated and unsaturated, evennumbered fatty acids, whose rate of synthesis is lower.
Über Pyromellitsäure‐ und Cumidinsäure‐Derivate VIII. Teil
Authors: Hoff H. , Manukian B. K.
Published: December 2004

The condensation of dichloropyromellitic acid dianhydride (I) with substituted anilines (o‐, p‐chloro‐, p‐fluoro) gave new derivates of dianilino‐pyromellitic acid di‐phenylimide (II, VI, VII).

The condensation of dichloropyromellitic acid di‐methylimide (IX) or of compound I with ethylamine yielded 1,4‐di‐ethylamino‐pyromellitic acid di‐ethylimide (X).
La structure de la cétone C15H16O formée par la réaction entre le norbornadiène et le pentacarbonyle de fer
Authors: Green M. , Lucken E. A. C.
Published: December 2004

The value of the spin‐spin coupling constant between vicinal protons is known to vary as cos2 φ, where φ is the dihedral angle between the carbon‐hydrogen bonds. A method, based on this relationship, for distinguishing between the exo‐endo isomers of bicycloheptane derivatives is proposed and tested on five such compounds of known structure. In this way, the configuration of I is determineed as exo‐trans‐exo, in contrast to the endo‐trans‐endo configuration proposed by Cookson.
Chemische Bestimmung der absoluten Konfiguration der Lysergsäure 54. Mitteilung über Mutterkornalkaloide
Authors: Stadler P. A. , Hofmann A.
Published: December 2004

The absolute configuration of natural lysergic acid was determined as (5 R:8 R) by ozonisation of 6‐methyl‐8‐methylene‐7‐keto‐ergolene and subsequent oxidation with performic acid to D‐N‐methyl‐aspartic acid which was identified in the form of its di‐n‐propyl ester.
Metallkomplexe mit Polyaminen XII: Mit cis‐cis‐1,3,5‐Triaminocyclohexan
Authors: Brauner Phyllis A. , Schwarzenbach G.
Published: December 2004

The 1:1‐metal complexes of cis‐cis‐1,3,5‐triamino cyclohexane (denoted by B) have been investigated. CuII, ZnII and AgI are forming a protonated complex of composition MHB3+ and AgHB2+ respectively, and their stability shows them to be chelates with the cyclohexane ring in the boat form. At higher pH‐values deprotonation to MB2+, AgB+ takes place. With silver a bimetallic complex Ag2B2+ is also formed. Complex formation with Ni2+, Co2+ and Cd2+ at equimolecular concentrations of 10−3 M is negligible.
Heilmittelchemische Studien In Der Heterocyclischen Reihe 35. Mitteilung. Über Sydnonimine. I. Herstellung und Eigenschaften von Sydnonimin‐Salzen
Authors: Daeniker H. U. , Druey J.
Published: December 2004

The synthesis and properties of different types of sydnonimine salts have been investigated. The stability of these salts containing different types of acid components has been examined, and their behaviour towards bases and acids and on catalytic hydrogenation is described. The UV.‐ and NMR.‐spectra of a number of these compounds are given and discussed.
Reaktionen von Steroid‐Hypojoditen IV. Über den Verlauf intramolekularer Substitutionsreaktionen, insbesondere bei 2β‐ und 4β‐Hydroxysteroiden. Über Steroide, 192. Mitteilung
Authors: Heusler K. , Kalvoda J. , Wieland P. , Anner G. , Wettstein A.
Published: December 2004

From 4β‐ as well as from 2β‐hydroxy‐steroids 19‐hemiacetal derivatives are formed in the «hypoiodite reaction», especially with lead tetraacetate and iodine, whereas 6β‐hydroxy‐steroids give 6β,19‐ethers exclusively(1). This behaviour is explained on the basis of the differences in the relative orientation of the hydroxyl groups towards the conformationally fixed 19‐CH2I group in the iodohydrin intermediates.
Recherches sur la formation et la transformation des esters XXXVIII. Sur la phosphonylation de divers types d'alcools
Authors: Cherbuliez Emile , Baehler Br. , Probst H. , Rabinowitz J.
Published: December 2004

The preparation of the phenylphosphonic monoesters of tribromoethanol, propargyl alcohol, glycerol, choline, menthol, and borneol is described.
Mizellenbildung in wässerigen Lösungen der sulfatierten Polyäthylenoxid‐Kondensaten des Nonylphenols
Authors: Milićević B.
Published: December 2004

The critical micelle concentration of detergents composed of ethoxylated nonyl‐phenyl sulfates has been determined by the surface tension method. Although the effect of ethylene oxide chain length on the critical micelle concentration follows a linear expression similar to that of non‐ionic detergents, the influence of temperature on the cloud point suggests a basic difference between the micelles of ethoxylated nonylphenols and those of their sulfates.
Über die Konstitution des Biflorins, eines o‐Chinons der Diterpen‐Reihe
Authors: Comin J. , de Lima O. Gonçalves , Grant Heather N. , Jackman L. M. , Keller‐Schierlein W. , Prelog V.
Published: December 2004

Chemical and spectroscopic evidence leads to constitution III for the bluish‐red antibiotic biflorin, C20H20O3 obtained from Capraria biflora L.
Recherches sur l'accumulation et la toxicité du radium et du radiostrontium dans le corps humain. III. Courbes d'élimination du strontium 90
Authors: Wenger Pierre , Soucas Kyriacos
Published: December 2004

The urinary excretion of two persons contaminated by 90Sr was followed up for 34 weeks. The excretion curve of one of these persons, whose contamination ceased 940 days before the beginning of the analyses, and which corresponds to a period of slow elimination, indicates a half‐time value of 2502 days. The curve of the other one, which has been taken just after contamination ceased and which corresponds therefore to a period of more rapid elimination, indicates a half‐time value of 337 days.
Reaktionen von Steroid‐Hypojoditen V Einwirkung von Blei(IV)‐acetat‐Jod auf 11β‐Hydroxysteroide. Über Steroide, 195. Mitt
Authors: Kalvoda J. , Heusler K. , Anner G. , Wettstein A.
Published: December 2004

The “hypoiodite reaction” with 11β‐hydroxysteroids of the 5αH, 5βH und Δ5 series is described. Both methyl groups C‐18 and C‐19 are substituted, and products of single and double radical attack are found. In the case of 5βH steroids the reaction at C‐19 gives 11β, 19‐ethers exclusively. The results are explained on the basis of the differences in the steric arrangement of the reactive centres in the intermediates of type C.
Notiz über die Alkaloide von Kopsia fruticosa
Authors: Guggisberg A. , Govindachari T. R. , Nagarajan K. , Schmid H.
Published: December 2004

Unter sehr milden Aufarbeitungsbedingungen liessen sich aus getrockneten Blattern von Kopisia fruticosa (KER.) A. DC., neben Kopsin, Fruticosin und Fruticosamin, Decarbomethoxy‐kopsin und Decarbomethoxy‐isokopsin isolieren. Fruticosin und Fruticosamin sind Isomere der Formel C22H24O4N2 und lassen sich gegenseitig ineinander umwandeln; das chromophore System und die Natur der funktionellen Gruppen dieser beiden Alkaloide wurden abgeklärt.
Über Pterinchemie. 6. Mitteilung. Ein in 9,10‐Stellung (ortho)‐dihydriertes Pterin: 9,10‐Dihydropterin‐8‐carbonsäureamid
Authors: Viscontini M. , Merlini L. , von Philipsborn W.
Published: December 2004

Protonenresonanz‐Spektren zeigen, dass ein fruher von uns als para‐Dihydro‐verbindung (11) aufgefasstes Pterinamid in Wirklichkeit die Struktur eines 9,10‐(ortho)‐Dihydropterin‐8‐carbonsaureamids (IV) besitzt.
19‐Norsteroide IV. Über die reduktive Ätherspaltung bei 5α‐Halogen‐6β, 19‐oxido‐steroiden. Über Steroide, 198. Mitteilung
Authors: Kalvoda J. , Heusler K. , Ueberwasser H. , Anner G. , Wettstein A.
Published: December 2004

The reductive cleavage of the ether bridge of 5α‐chloro‐ and 5α‐bromo‐6β, 19‐oxido‐steroids to 19‐hydroxy‐Δ5‐steroids has been studied : Whereas 5α‐bromo‐6β, 19‐ethers could be reduced under mild conditions, i. e. with zinc and acetic acid, 5α‐chloro‐6β, 19‐ethers could only be cleaved with lithium and liquid ammonia. However, the latter steroids with an additional electronegative substituent in 19‐position, namely 5α‐chloro‐6β, 19‐hemiacetals and ‐lactones, were smoothly converted into Δ5‐19‐aldehydes and Δ5‐19‐acids, respectively, by the action of zinc and acetic acid. The Δ5‐steroid‐3 9‐oic acids obtained could be decarboxylated thermally to Δ5(10)‐19‐norsteroids.
Thermodynamik der Färbevorgänge. I. Absorptionsmodelle
Authors: McGregor R.
Published: December 2004

A brief discussion is given of the selection of the reference states for defining the relative activity of a desperse dye in the fibre phase and in the solution phase. Contrary to recent findings2), it is suggested that the application of the Flory‐uggins equations for polymer solutions to desperse dyeing equilibria leads to the prediction that the adsorption isotherm will be linear for concentrations expressed in molalities. Furthermore, the partition coefficient should not vary with the molecular weight of the polymer or fibre phase.
Zur Kenntnis ätherischer Öle. 1. Mitteilung. Zur Kenntnis des Mandarinenschalen‐Öls (Citrus reticulata BLANCO, bzw. Citrus nobilis var. deliciosa SWINGLE „Mandarin”︁)
Authors: Kugler E. , Kováts E. sz.
Published: December 2004

The volatile part of the essential oil of mandarine peel has been analysed. The crude, pressed oil was first divided into various fractions, mainly with the aid of physical methods. On distillation of these fractions the pure components could be isolated by preparative gas chromatography.
De la chimie des Ptérines. 7e communication. Obtention de dimères à partir de ptérines hydrogénées
Authors: Viscontini M. , Piraux M.
Published: December 2004

Par oxydation de ptérines auxquelles est attribuée, à titre d'hypothèse de travail, la structure de ptérines para‐dihydrogénées, on obtient 3 paires de ptérines probablement dimères.
Photochemische Reaktionen. 22. Mitteilung. UV.‐Bestrahlung von 11‐Oxo‐Steroiden III. Zur Beeinflussung der (11 → 19)‐Cyclisation durch sterische Faktoren
Authors: Iriarte J. , Schaffner K. , Jeger O.
Published: December 2004

The photochemical cyclisation of 11‐keto steroids to 11β, 19‐cyclo‐11‐hydroxy compounds is strongly influenced by steric factors. The presence of a gem‐dimethyl group at C‐4 gives rise to a marked improvement in the yield of the cyclic product. The nature of this steric interaction is briefly discussed.
Heilmittelchemische Studien in der heterocyclischen Reihe. 42. Mitteilung. 2,3,4,5‐Tetrahydro‐1,4‐benzoxazepine
Authors: Schenker K. , Druey J.
Published: December 2004

The reaction of 2‐(2′‐chloroethoxy)‐acetophenone (I) with non‐hindered primary aliphatic amines is shown to give 4‐alkyl‐5‐methylene‐2.3.4.5‐tetrahydro‐1.4‐benzoxazepines (IV) which can be smoothly hydrogenated to the corresponding 5‐methyl derivatives VI. Steric limitations of this ring closure are discussed.
Chinazoline und 1,4‐Benzodiazepine. XIII. Mitteilung. Synthese von 7‐Carbalkoxy‐, 7‐Carbamoyl‐ und 7‐Cyan‐5‐phenyl‐1,4‐benzodiazepin‐Derivaten
Authors: Sternbach L. H. , Saucy G. , Smith F. A. , Müller M. , Lee J.
Published: December 2004

The synthesis of several 1.4‐benzodiazepine derivatives with a carbalkyxy, a carbomoyl or a cyano group in position 7 via the corresponding o‐aminobenzophenones is described.
Über die Herstellung von 1,1‐Chlorfluorcyclohexen und 1‐Fluorcyclohexen
Authors: Hopff H. , Valkanas G.
Published: December 2004

Reaction of hydrogen fluoride with 1‐chloro‐cyclohexene in ether solution at 0° C gave 1‐fluoro‐1‐chloro‐cyclohexane in 96% yield. The latter, when treated in the presence of cobalt naphthenate with a stream of air, is readily converted to 1‐fluoro‐cyclohexene.
Contribution à l'étude du système quinaire H+Na+K+Cl−PO4− − −H2O. I. Généralités et systèmes ternaires NaClKClH2O, KClKH2PO4H2O, NaClNaH2PO4  H2O et NaH2PO4KH2PO4H2O
Authors: Brunisholz G. , Bodmer M.
Published: December 2004

A new technique suitable for the determination of solubilities at temperatures above 50° has been described. The ternary systems NaClKClH2O and KClKH2PO4H2O have been reinvestigated and solubility isotherms of the systems NaClNaH2PO4H2O and KH2PO4NaH2PO4H2O have been established at various temperatures.
Contribution à l'étude du système quinaire H+Na+K+Cl−PO4− − −H2O. II. Le diagramme de solubilité du système quaternaire Na+K+Cl−H2PO4−H2O
Authors: Brunisholz G. , Bodmer M.
Published: December 2004

The solubility isotherms of the quarternary system Na+K+Cl−H2PO4−H2O are given for O° 25° and 75°. Additional data have been used for the establishment of the polytherms, between 0° and 100°, of the two «3 salt lines» (saturation with NaCl + KCl + KH2PO4, and NaCl + KCl + a sodium dihydrogenophosphate) and of two «2 salt surfaces» (saturation with NaCl + KCl, and NaCl + KH2PO4). The parameters of the two invariant points of the system have been established by interpolation. The salts NaCl and KH2PO4 form the «stable salt pair» at all temperatures between 0° and 100°.
Die Löslichkeit von Metallsulfiden I. Schwarzes Quecksilbersulfid
Authors: Schwarzenbach G. , Widmer Michael
Published: December 2004

The total concentration of dissolved mercury in equilibrium with solid HgS and in the presence of excess sulfide (present in the form of H2S, HS‐ and S2− has been determined radiochemically and gravimetrically. The difficult problem of the clean separation of the precipitated HgS from the solution could be solved by very slow filtration of large quantities of the suspension through a small porous plate under constant pressure. The solubility at a constant concentration of excess sulfide (=0,019 molar) as a function of pH is demonstrated in figure 1. The solubility is due to the complex Hg(SH)2 below pH 5, the complex HS‐Hg‐S‐ between pH 6 and 8, and the complex HgS above pH 9. The solubility produce of black HgS, the stability constants of the complexes, and the two acidity constants of Hg(SH)2 are given in the last section of the paper.
3‐Substituierte Dehydrochinuclidine und Chinuclidine. Chinuclidin‐Reihe, 8. Mitteilung
Authors: Grob C. A. , Zergenyi J.
Published: December 2004

Several 3‐substituted dehydroquinuclidines and corresponding quinuclidines have been prepared.
Phtalocyanine in wässeriger Lösung IV. Kinetik und Mechanismus der Metallkomplexbildung
Authors: Schiller I. , Bernauer Klaus
Published: December 2004

The mechanism of metal ion incorporation into phthalocyanine tetrasulfonic acid has been investigated. The rate determining step of these reactions is the pyrrole‐NH‐dissociation of the ligand, which is catalysed by particles like MeOH+.
Die Analyse «scheinbar einfacher» kernmagnetischer Resonanzspektren
Authors: Diehl P.
Published: December 2004

The theory of observed spectra that give less than the theoretical number of transitions, i.e. apparently simple spectra, is studied. The general conditions for the existence of such spectra of the type AB … RX … are discussed in terms of effective LARMOR‐frequencies. Explicit experimental conditions for which observed spectra are apparently simple are given for spectra of the type ABX as well as A2B2X.
9. 3,4,7,8‐Tetrahydro‐2H‐6H‐pyrimido[2,1‐b]1,3‐oxazin‐2,4‐dione Derivate eines neuen Ringgerüstes 2. Mitteilung über Struktur und Reaktivität heterocyclischer Verbindungen
Authors: Gmünder J. , Lindenmann A.
Published: December 2004

Hexahydropyrimidone‐(Z), reacted with dialkylmalonic acid dichlorides, does not yield malonylhexahydropyrimidones 111, but carboxylic acid derivatives V, the structure of which is confirmed by various reactions. Splitting off of water from V with dicyclohexyl‐carbodiimide, again does not yield malonylhexahydropyrimidones 111, but ‐as may be shown by the NMR.‐spectrum ‐the isomeric 3,4,7,S‐tetrahydro‐ 2H‐6H‐pyrimido[Z21‐b]l, 3‐oxazine‐2,4‐diones X. Various reactions, as well as the spectral behaviour of these compounds in the infra‐red and ultra‐violet ranges, are discussed. These compounds are chemically similar to acid anhydrides and azlactones.
Papierchromatographische Prüfung der Sekrete von Bufo melanostictus Schneider und Bufo asper Gravenhorst Krötengifte, 30. Mitteilung
Authors: Iseli E. , Weiss Ek. , Reichstein T. , Chen K. K.
Published: December 2004

According to paperchromatograms the paratoid secretion ofBufo melanostictus SCHNEIDER was found to contain 12 bufogenins. Three of these (M, Bt und H) have been identified with the known genins Marinobufagin, Bufotalin and Hellebrigenin. Two other ones (X1 and X2) are possibly identical with Resibufogenin and Bufalin. By the same method the secretion of Bufo asper GRAVENHORST was found to contain 9 bufogenins. A1 again is possibly identical with Resibufogenin; two others have been shown to be Marinobufagin (M) and Bufotalin (Bt). One genin (AZ), present in relatively large amount, should certainly be a new substance.
Präparative Darstellung und qualitative Eigenschaften von Xenontetrafluorid
Authors: Schumacher Ernst , Schaefer Manfred
Published: December 2004

A method for continuous preparation of XeF4 is described. Several chemical properties of the substance are qualitatively studied. Among these a reaction with acetic acid or acetic anhydride leads to a crystalline compound, whereas the product formed between XeF4, and BF3, yields a violet solid, stable below −100°C.
Über pyrophores Eisen
Authors: Feitknecht W. , Durtschi A.
Published: December 2004

If iron oxides are reduced at temperatures ranging from 300° to 500°C, Fe3O4, is first formed, if not already present, and this goes directly over into iron. The nucleation of iron is slow, and if the oxide is finely crystalline, the iron nuclei grow by diffusion of iron atoms from many oxide crystals already at a temperature of approximately 300°C. The iron crystals sinter together to form irregular secondary particles. ‐ Responsible for the pyrophorous behaviour is the specific surface. Self‐ignition occurs when this surface is greater than approximately 3 m2/g. Pyrophorous iron can be inactivated with a mixture of N2 low in 02, an oxide layer being formed approximately 13 Å, i.e. ca. 6 02−‐layers, thick. An estimation of the heat produced on forming this layer and of the resulting temperature increase leads to a value which is in agreement with the ignition temperature of inactivated iron powder with a specific surface of approx. 3 m2/g.
Strahlungschemie der Kohlenwasserstoffe 11. MitteilungToluol‐α‐d3
Authors: Hoigné Jürg , Gäumann Tino
Published: December 2004

The products produced by γ‐rays in liquid toluene‐α‐d3 are compared with those measured in toluene‐α‐d0. The overall polymer‐formation is hardly affected by the deuteration but the yield of the individual dimeric compounds is characterised by the fact that the formation of the benzyl radicals becomes about 40% of the value in protonated toluene. This results in a benzyl formation of 17%, a benzyl‐toluene formation of 400%, and an increased yield of all the bitolyls as compared with the values found for toluene‐α‐d0.
Über die Aktivierung des Biotins
Authors: Valloton M. , Leuthardt F.
Published: December 2004

Biotin hydroxamate is formed when [14C]‐biotin is incubated with a partially purified extract of chicken liver in the presence of ATP, Mg++ and an excess of hydroxylamine. Free biotin and the hydroxamate have been separated by chromato‐ graphy on anion‐exchange paper. Hence we conclude that biotin was activated to form biotin‐adenylate.
Recherches sur la formation et la transformation des esters L Réaction entre acide phosphoreux et alcools de divers types, notamment diols
Authors: Cherbuliez Emile , Prince R. , Rabinowitz J.
Published: December 2004

Reacted with phosphorous acid under reduced pressure, the linear 1,ωdiols (ω= 3 to 8) yield a mixture of the corresponding phosphorous diprimary diesters H,2O2‐R‐OPO2, H2, and ω‐hydroxy‐1‐alkyl monoesters. Cyclohexane‐1,4‐diol reacts in the same manner. The linear diols with ω = 2, 9, 10 or 32, as well as cyclohexane‐ l12‐diol, yield the phosphorous monoesters exclusively. Halogenated alcohols, cyclohexanol, and glycerol, reacted with phosphorous acid, yield the corresponding phosphorous monoesters. Phosphorous monoesters and diprimary diesters are stable in aqueous solutions between pH 3 and pH 9, but are very quickly hydrolized in strongly acidic or alka‐ line solutions.
Zur Kenntnis des Kohlenstoffringes. 78. Mitteilung Untersuchung von trans‐1‐Methl‐cyclodecen‐(1)‐on‐(6) auf Atropisomerie mittels einer asymmetrischen Synthese aus (1s, 9R, 10R)‐10‐Hydroxy‐1‐methansulfonyloxy‐9‐methyl‐decalin
Authors: Westen H. H.
Published: December 2004

Repetition of WHARTON'S stereospecific synthesis [6] of trans‐l‐methyl‐l‐cyclo‐decen‐6‐one has led to the elucidation of the hitherto partly unknown configuration of the intermediates.
Die Cardenolide der Samen von Strophanthus vanderijstii Staner. 2. Mitteilung. Trennung der wasserlöslichen Glykoside Glykoside und Aglykone, 254, Mitteilung
Authors: Brenneisen K. , Euw J. V. , Tamm Ch. , Reichstein T.
Published: December 2004

The presence of 19 cardenolides (G, H, J, K, L1 L2 L3 M1, M2 M3 M4 M5, O, P1, P2, Q1, Q2, Q3 and R) could be traced in the water‐soluble parts obtained after fermentation from the seeds of Stropkalzthus vartderijstii STANER. Eight of these (G, H, J, K, L1, L2, L3 and M1) could be isolated in crystal line form, and two (O and P2) in amorphous but homogeneous form, according to paper chromatography. P2 M2 and M3 were obtained as crystalline O‐acetyl derivatives. The presence of M4 M5 and of three components in the Q group became evident only after degradation reactions.
Über die Herstellung von 2‐Amino‐5‐Pyrazincarbonsäure und Derivaten
Authors: Felder E. , Pitré D. , Grabitz E. B.
Published: December 2004

2‐Acetylaminoquinoxaline was oxidized with potassium permanganate to 2‐acetyl‐aminopyrazine‐5,6‐dicarboxylic acid which yielded 2‐aminopyrazine‐5,6‐dicarboxy‐lic acid by acid hydrolysis. This acid was decarboxylated in high yield to 2‐amino‐pyrazine‐5‐carboxylic acid which was further converted into its methyl ester, ethylester and amide, and into 2‐hydroxypyrazine‐5‐carboxylic acid.
BECKMANN‐Umlagerung und Fragmentierung. 1. Teil. Mechanismus sowie Nachweis der Zwischenstufen Fragmentierungsreaktionen. 7. Mitteilung
Authors: Grob C. A. , Fischer H. P. , Raudenbusch W. , Zergenyi J.
Published: December 2004

The mechanism of the BECKMANN rearrangement and the fragmentation of ketoximes 1 has been studied by determining rate constants and products in «80%» ethanol of several anti‐alkyl‐, ‐cycloalkyl‐, ‐aralkyl‐ and ‐phenyl‐ketoxime tosylates with stationary syn‐methyl and ‐phenyl substituents. The ratio of fragmentation to amide formation is not related to reaction rate, but increases with the stability of the carbonium ion R+ formed, as reflected by the solvolysis rates of the corresponding alkyl chlorides RC1. Fragmentation to nitriles, therefore, occurs after the rate‐deter‐ mining migration step.
Recherches sur les arǒmes 10ecommunication [1] Sur l'arǒme des fraises fraîches. Analyse des composés, esters et alcools volatils
Authors: Winter M. , Willhalm B.
Published: December 2004

The analysis of the volatile parts of fresh strawberry flavour is described. Among 35 substances identified, the following had not been found before in strawberries:

Carbonyl compounds: propanal, acrolein, crotonal, pent‐2‐enal, cis‐hex‐3‐enal, pentan‐2‐one, and heptan‐2‐one.

Alcohols: pent‐1‐en‐3‐ol, heptan‐2‐ol and benzylic alcohol.

Esters: propyl acetate, methyl caproate, hexyl butyrate, isopropyl butyrate, ethyl crotonate and trans‐hex‐2‐en‐1‐yl butyrate.
Scillarenin‐β‐D‐glucosid, ein neues Herzglykosid aus der roten Meerzwiebel 52. Mitteilung über Herzglykoside [1]
Authors: von Wartburg Albert
Published: December 2004

The isolation of scillarenin‐@‐D‐glucoside, a hitherto unknown glycoside from the red variety of squill (sea onion, Scilla maritima (BAKER) L.), is described. The structure of the new compound has been elucidated by acid hydrolysis to D‐glucose and the anhydrogenin scillaridin (VII), and by enzymatic degradation to the true aglycone scillarenin (VIII).
Ein neues Diterpen aus Salvia officinalis L. und eine Notiz zur Konstitution von Pikrosalvin
Authors: Linde Horst
Published: December 2004

Aus den Blättern von Salvia officinalis L. konnte eine neue Diterpen‐diphenol‐carbonsäure (äls Diacetylverbindung) isoliert und in ihrer Konstitution aufgeklärt werden. Durch eine relativ einfache und übersichtlich verlaufende Reaktionsfolge liess sich eine Verknüpfung rnit dem in derselben Pflanzenart von BRIESKORN et al. aufgefundenen Pikrosalvin erzielen, womit die von diesen Autoren postulierte Konstitution XIII (vgl. [6]) für Pikrosalvin im Sinne der Formel XIV modifiziert werden sollte. Pikrosalvin selbst liess sich in dem untersuchten Drogenmuster nicht auffinden.
Über die Synthese des 1,2,4‐Triacetylbenzols
Authors: Hopff H. , Grasshoff J.
Published: December 2004

The unknown 1,2,4‐triacetylbenzene has been prepared by oxidation of 2,4‐di‐ethylacetophenone with aqueous potassium permanganate. With amino acids in low concentrations, it gives deeply coloured solutions.
In den Catecholamin‐Metabolismus eingreifende Substanzen. 3. 2,3‐Dihydroxyphenylacetamide und verwandte Verbindungen
Authors: Carlsson A. , Corrodi H.
Published: December 2004

A series of new derivatives of 2,3‐dihydroxyphenylacetamide and congeners is described. Results are reported which support the view that these compounds inhibit in mammals the enzymatic hydroxylation of phenylalanine to tyrosine, of tryptophan to 5‐hydroxytryptophan, and of tyrosine to dopa, without inhibiting catechol‐O‐methyl‐transferase (COMT). In this regard they differ from the earlier published 3,4‐dihydroxyphenylacetamides (dopacetamides) Most potent are α‐ethoxy‐2,3‐dihydroxyphenylacetamide and α‐isopropyl‐2,3‐dihydroxyphenylacetamide.
Die Konstitution von Brefeldin A
Authors: Sigg H. P.
Published: December 2004

The constitution of Brefeldin A, a mold metabolite from Penicillium brefeldianum DODGE, has been elucidated as 1 by chemical degradation.
Die ESR.‐Spektren der Radikal‐Ionen des 1,3,6,8‐Tetraazapyrens
Authors: Gerson F.
Published: December 2004

1,3,6,tetraazapyrene (I) forms a radical anion by alkali metal reduction in 1,Z‐dimethoxyethane as well as a radical cation in conc. sulphuric acid. The ESR hyperfine structures of the radical ions are very similar, and this similarity is discussed in terms of simple MO‐theory.
Zum Mechanismus der Metallionen‐Katalysierten Hydrolyse von Adenosintriphosphat (ATP). I
Authors: Schneider P. W. , Brintzinger H.
Published: December 2004

The rate of hydrolysis of ATP metal ion complexes – as well as the sign of optical rotation of the resulting ADP complexes – are shown to result from special steric arrangements of metal ion, adenine ring and phosphate groups in the respective nucleotide complexes. It is concluded that catalytic – and possibly also enzymatic – enhancement of reactivity of ATP depends on the selective coordination of either a metal ion or a proton to the β‐PO2−group. Such selective coordination – versus the concurrent coordination to the more basic terminal –P032−group – is brought about by the occurrence of an additional ligand in juxtaposition to the β‐PO2− group, providing a kind of chelate effect in favour of the complex isomer in which the terminal POP bond is labilized.
Optische Messung der Kinetik von simultaner Diffusion und chemischer Reaktion 1. Ordnung in planparallelen Platten
Authors: van Tets A. , Günthard Hs. H.
Published: December 2004

The kinetics of a process is considered which consists of simultaneous diffusion and first order decay reaction of a substance within thin slabs. Several formulas, tables and graphs are given which may be useful for the determination of the relevant constants oi the model, i. e. surface and bulk diffusion coefficients 𝒟 and D, and rate constant k respectively. For this model it is shown that the saturation value of optical density may rather easily be estimated from a plot of optical density vs logarithm of time t (see table 1).
Über chelatbildende Salicylsäure‐Analoge der Thiophenreihe
Authors: Courtin A. , Class E. , Erlenmeyer H.
Published: December 2004

Derivatives of 2‐carboxy‐3‐hydroxy‐thiopheneand of 3‐carboxy‐4‐hydroxy‐thio‐ phene have been synthesized in order to examine the influence of different bond orders on the chelating properties of the salicylic acid grouping in these compounds, which show a blue color reaction with aqueous FeCl3.
Die Glykoside der Wurzeln von Asclepias glaucophylla SCHLECHTER. Glykoside und Aglykone, 257. Mitteilung
Authors: do Nascimento J. M. , Tamm Ch. , Jäger Herb. , Reichstein T.
Published: December 2004

The roots of Asclepias glaucophylla SCHLECHTER are very rich in steroids;two distinct groups are present: cardenolides and ester glycosides of pregnane derivatives.
Über die Sorption von Gasen an Feststoffen. 1. Mitteilung: Konstruktion einer Thermo/Vakuum‐ und einer Thermo/Druck‐Waage
Authors: Böhlen B. , Guyer A.
Published: December 2004

Es werden zwei Thermowaagen beschrieben, die es ermöglichen, in einem weiten Temperaturbereich Wägungen bei Drucken von 0–760 Torr bzw. 1–20 ata durch zu‐führen. Ihre Arbeitsweise wird diskutiert und anhand von Eichmessungen werden Genauigkeit und Leistungsfähigkeit der beiden Geräte überprüft.
Über die Sorption von Gasen an Feststoffen. 2. Mitteilung: Praktische Anwendungsbeispiele einer Thermo/Vakuum‐und einer Thermo/Druck‐Waage
Authors: Böhlen B. , Hausmann W. , Guyer A.
Published: December 2004

Anhand einiger praktischer Beispiele werden verschiedene Anwendungsmöglichkeiten einer neuen Thermo/Vakuum‐ und einer Thermo/Druck‐Waage aufgezeigt.
Synthèse de La Phe2‐Orn8‐vasopressine et de la Phe2‐oxytocine, deux analogues de la vasopressine doués d'une activité Pressorique sélective
Authors: Huguenin R. L.
Published: December 2004

Phe2‐Orn8‐vasopressin and Phe2‐Orn8‐oxytocin have been prepared by synthesis Both analogues, but especially the second one, have a more selective pressor activity than the natural vasopressins and than most hitherto synthesized analogues these hormones.
Substances naturelles isolées de microorganismes. 1re communication, Préliminaire. Nouvelles ptéridines et nouvelles porphyrines obtenues à partir de Pseudomonas roseus fluorescens J. C. MARCHAL 1937
Authors: Viscontini M. , Pouteau‐Thouvenot M. , Bühler‐Moor R. , Schroeder M.
Published: December 2004

A partir d'un bouillon de culture synthétique de Pseudomonas roseus fluorescens J. C. MARCHAL 1937, nous avons isolé et caractérisé l'hydroxyméthyl‐8‐ptérine, la L‐thréo‐trihydroxypropyl‐8‐ptérine que nous appelons monaptérine, et une zinco‐porphyrine que now appelons usticaphyrine.
Welkstoffe und Antibiotika. 30. Mitteilung. Ausgangsprodukte zur Totalsynthese des Javanicins
Authors: Hardegger E. , Steiner K. , Widmer E. , Corrodi H. , Schmidt Th. , Knoepfel H. P. , Rieder W. , Meyer H. J. , Kugler F. , Gempeler H.
Published: December 2004

Zur Herstellung von Ausgangsprodukten zur Synthese des Javanicins wurden, ausgehend von Vanillin (1) über Methoxyhydrochinon (2), dessen Ester 2a, b und 1, 2, 4‐Trimethoxybenzol (2c) mit FRIES'scher Verschiebung, FRIEDEL‐CRAFTS‐Reaktion und MANNICH‐Kondensation eine grössere Anzahl Verbindungen vom Typus 3, 4, 5, 6 hergestellt, welche die neu eingeführten Substituenten in o‐, m‐, p‐Stellung zu den bereits vorhandenen Sauerstoff‐Funktionen tragen. Weitere Auf‐baureaktionen unter Anwendung von Malonestersynthesen führten zu monocyclischen Präparaten von Typus 20, 21, die z. T. bereits sämtliche C‐ und O‐Atome des Javanicins in der richtigen Anordnung aufwiesen, bisher aber nicht zu Javanicin‐Derivaten cyclisiert werden konnten.
Welkstoffe und Antibiotika. 33. Mitteilung. Selektive Spaltung der Äther chelierter Phenole und Synthese von Javanicin
Authors: Hardegger E. , Widmer E. , Steiner K. , Pfiffner A.
Published: December 2004

Es gelang unter sehr milden Reaktionsbedingungen Phenoläther, welche ein ortho‐ bzw. peri‐ständiges Carbonyl enthalten, mittels Aluminiumchlorid in Nitrobenzol in wasserlösliche Aluminiumkomplexe umzuwandeln, deren Zersetzung mit Wasser oder Säure zu den freien Phenolen führte. Die Methode erlaubte u. a. die Herstellung von Javanicin und Anhydrojavanicin aus synthetischem Javanicin‐A‐dimethylather, womit die Konstitution der Naturstoffe Javanicin und Fusarubin bezüglich der Lage der Methoxylgruppe endgültig gesichert erscheint.
Recherches expérimentales sur l'ozonation des fumarate, maléate et cinnamate d'éthyle, suivie par spectrographie d'absorption IR
Authors: Briner E. , Fliszár S. , Rossetti G. P.
Published: December 2004

L'ozonation des fumarate, maléate et cinnamate d'éthyle a été étudiée en tenant compte des trois processus intervenant de façon plus ou moins marquée: (1) l'attaque par l'ozone de la liaison éthylénique, conduisant à la formation d'aldéhyde; (2) la scission spontanée des ozonides, aboutissant à la production d'aldéhyde et d'acide; (3) l'autoxydation des aldéhydes formirs lors de l'attaque par l'ozone.
Isomere des Chanoclavins aus Claviceps purpurea (Fr.) Tul. (Secale cornutum) 63. Mitteilung über Mutterkornalkaloide
Authors: Stauffacher D. , Tscherter H.
Published: December 2004

From a rye ergot alkaloid fraction rich in chanoclavine we isolated three new crystalline alkaloids, each a stereoisomer of the known chanoclavine. Their configurations could be elucidated by NMR.‐spectra. According to the nomenclature of the dihydro‐d‐lysergic acid series the isolated alkaloids are named: chanoclavine‐(I) (formerly named chanoclavine), chanoclavine‐(II), rac. chanoclavine‐(II) and isochanoclavine‐(I).
Eine experimentelle Methode zur Ermittlung der Singulett‐Triplett‐Konversionswahrscheinlichkeit und der Triplett‐Spektren von gelösten organischen Molekeln Messungen an 1,2‐Benzanthracen
Authors: Labhart Heinrich
Published: December 2004

Small changes in optical density due to chopped cross illumination are measured as a function of wavelength. The theory of this effect shows that from such measurements it is possible to find not only the spectrum of molecules in the lowest triplet state, but also the quantum yield of triplet generation. Measurements were made with outgassed solutions of 1,2‐benzanthracene in hexane at room temperature. The triplet‐triplet spectrum has been determined in the range from 270 to 510 mμ (see fig. 5) and the quantum yield for triplet generation was found to be νT = 0.55 ± 0.10.
Die Farbreaktion der Phenole mit dem Chlor/o‐Tolidin‐Reagens
Authors: Weber S. H. , Langemann A.
Published: December 2004

Phenols produce colours with chlorine/o‐tolidine, a method usually applied for the detection of NH‐groups. A series of phenols has been tested and the results are compared with standard tests for phenols. The procedure described is particularly suitable for spray reagents in paper and thin layer chromatography.
Intrasphärische und extrasphärische Komplexe mit Phosphatliganden. Infrarotspektren von Phosphatkomplexen in wässeriger Lösung
Authors: Brintzinger H.
Published: December 2004

The structures of complexes with ligands containing the PO32− group – monomethyl phosphate, diphosphate, monomethyl diphosphate and adenosine‐5′‐triphosphate – have been studied by infrared absorption measurements in aqueous solution.
Die Glykoside der Samen von Vallaris solanacea (ROTH) O. K. Isolierungen. Glykoside und Aglykone, 263. Mitteilung
Authors: Kaufmann Heinz , Wehrli W. , Reichstein T.
Published: December 2004

The seeds of Vallaris solanacea (ROTH) O.K. are very rich in cardiac glycosides. Eight KEDDE‐positive substances have been detected through paper‐ and thinlayerchromatography. All of them could be isolated in crystalline form. The yields varied between 0,03% and 0,9% with respect to the dry weight of the seeds.
Zur Kenntnis der BOHN‐SCHMIDT'schen Reaktion. 1. Mitteilung. Isolierung und Strukturaufklärung neuartiger Verbindungen aus der Oleumschmelze von α‐Hydroxyanthrachinonen
Authors: Winkler J. , Jenny W.
Published: December 2004

In the course of an investigation of the BOHN‐SCHMIDT reaction, cyclic bis‐sulfonic esters of tetrahydroxy‐anthracenes have been isolated from solutions of 1‐hydroxy‐, 1,4‐dihydroxy‐, 1,5‐dihydroxy‐, and 1,4,5,8‐tetrahydroxy‐anthraquinones in high‐percent oleum. The constitution of the new compounds is confirmed by UV., IR., NMR. and mass spectra.
Organische Phosphorverbindungen XVII. Darstellung von Alkylen‐bis‐phosphonsäurechloriden und Alkylen‐bis‐thiophosphonsäurechloriden und deren Reaktion mit GRIGNARD‐Verbindungen
Authors: Maier Ludwig
Published: December 2004

The synthesis and some physical properties of alkylene bis‐(phosphonic dichlorides), Cl2P(O)(CH2)n(O)PCl2, and of alkylene bis‐(phosphonothioic dichlorides), Cl2P(S)(CH2)n(S)PCl2, a new class of compounds, are reported. The reactions of alkylene bis‐(phosphonothioic dichlorides) with GRIGNARD reagents and of CH3P(S)Br2 with di‐GRIGNARD reagents are also described. Some physical properties of several diphosphine disulfides and of two cyclic tertiary phosphine sulfides have been determined.
Eine ergiebige Synthese von Rosenoxid
Authors: Ohloff G. , Lienhard B.
Published: December 2004

Es wird ein ergiebiger Weg zur Darstellung eines Gemisches der Rosenoxide 6 und 7 beschrieben. Die aus dem Epoxid 8 des β‐Citronellols – über die Öffnung des Oxiranringes durch sekundäre Amine – erhaltenen N‐Oxide liefern durch Pyrolyse das 2,6‐Dimethyl‐3‐octendiol‐(2,8) (4), das mit Säuren in die diastereomeren Tetrahydropyran‐Derivate 6 und 7 übergeführt wird.
Über spezifisch adsorbierende Silicagele IV
Authors: Erlenmeyer H. , Bartels H.
Published: December 2004

The substances which give specific adsorbing footprints on silica gels seem to be those having sufficiently low Rf‐values in thin layer chromatograms on silica gel with water as solvent.