bluuebunny/crossref_metadata_2025_split huggingface dataset:
Über Muscarin. 15. Mitteilung [1]. Reduktion von Normuscaron mit Borwasserstoff und bicyclische Derivate der Muscarinreihe
Authors: Hardegger E. , Halder N. 
Published: December 2004

AbstractDie Reduktion von Normuscaron (IIb) mit Borwasserstoff führte wie die meisten andern bisher untersuchten Reduktionsmethoden zu allen 4 Norbasen (III, IIIa, IIIb, IIIc) der Muscarinreihe, für deren chromatographisch‐analytische Bestimmung ein einfaches, zuverlässiges System gefunden wurde. Zwei stereoisomere Verbindungen mit der Struktur des N‐Benzylderivats II wurden nebst dem N, N‐Bisnormuscaron (IIa) erstmals hergestellt.
Nichtstationäre Kinetik bei SN1, SN2, E1, E2 und E1cb‐Mechanismen
Authors: Frei K. , Günthard Hs. H. 
Published: December 2004

AbstractFor the SN1, SN2, E1, E2, AND E1cb mechanisms exact solutions of the kinetic equations are compared with solutions obtained under the hypothesis of stationarity. Exact integrals are calculated numerically for a set of the essential reaction rate constants. Comparison with the stationary state solution demonstrates that both types of solutions are approximately equal in many cases if the transient particle concentration remains low, whereas the conventional requirement | \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop x\limits^. $\end{document} | = 0 is unimportant. For approximation of exact kinetics by stationary kinetics, however, neither condition is sufficient nor necessary. Practical criterions for recognition of deviations from stationary kinetics are given.
Etude sur les composés organométalliques III [1]. Action d'organomagnésiens sur des complexes du tétrachlorure de titane
Authors: Boustany Kamel S. , Bernauer Klaus , Jacot‐Guillarmod André 
Published: December 2004

AbstractThe reaction between RMgX and TiCl4,2L (L = pyridine, piperidine or quinoleine) is shown to give a high yield of organo‐titanium (IV) compounds. As expected, the decomposition of the latter is reduced to a minimum by the ligand L initially present, allowing the preparation of etheral solutions of R4Ti (R = benzyl, phenyl or butyl). R4Ti is obtained whatever may be the initial molar ratio of RMgX/TiCl4, 2L.
Über Inhaltsstoffe des Haschisch. 2., vorläufige Mitteilung. Synthese von (−)‐Δ6, 1‐3, 4‐trans‐Tetrahydrocannabinol, sowie von (±)‐Δ6, 1‐3, 4‐trans‐Tetrahydrocannabinol
Authors: Petrzilka T. , Sikemeier C. 
Published: December 2004

AbstractAcids, such as p‐toluenesulfonic acid, mediate the direct formation of optically active (−)‐Δ6,1‐3,4‐trans‐tetrahydrocannabinol from (+)‐cis‐or (+)‐trans‐p‐menthadiene‐(2,8)‐ol‐(1) and olivetol.
Sur la composition de l'arôme de cacao
Authors: Marion J. P. , Müggler‐Chavan F. , Viani R. , Bricout J. , Reymond D. , Egli R. H. 
Published: December 2004

AbstractA gas‐chromatographic separation of cocoa aroma, followed by infra‐red and mass‐spectrometric identification, has yielded, besides 22 of the 91 previously described constituents, 35 new substances (8 aliphatic, 1 alicyclic, 7 aromatic, 9 o‐heterocyclic, 4 pyrrolic, and 6 pyrazinic).
Stoffwechselprodukte von Mikroorganismen. 57. Mitteilung. Boromycin
Authors: Hütter R. , Keller‐Schien W. , Knüsel F. , Prelog V. , Rodgers G. C. , Suter P. , Vogel G. , Voser W. , Zähner H. 
Published: December 2004

AbstractA new strain of Streptomyces antibioticus (WAKSMAN et WOODRUFF), ETH 28829, produces a novel antibiotic, boromycin, which appears to be the first well defined boron containing organic compound to have been found in nature. Boromycin is a complex of boric acid with a tetradentate organic complexing agent, that yields by hydrolysis D‐valine, boric acid, and a polyhydroxy compound of macrolide type.
Podophyllum‐ Lignane: Struktur und Absolutkonfiguration von Podorhizol‐β‐D‐glucosid ( = Lignan F). 19. Mitt. über mitosehemmende Naturstoffe [1]
Authors: Kuhn M. , Von Wartbung A. 
Published: December 2004

AbstractPodorhizol‐β‐D‐glucoside (1) ( = lignan F), C28H34O13, a new lignan from the roots and rhizomes of Podophyllum species, represents one of the rare glucosides which are cleaved by acids as well as by bases. Acid hydrolysis furnished the intact aglycone podorhizol (3) and in addition two cyclisation products characterized as desoxy‐podophyllotoxin (10) and (−)‐isodesoxypodophyllotoxin (11), respectively. Base catalysed fission of the glucoside 1 yielded D‐glucose and anhydropodorhizol (9). Podorhizol was smoothly oxidized to the corresponding ketone podorhizone (5), which upon treatment with NaOCH3 underwent cleavage into methyl 3,4,5‐trimethoxy‐benzoate (8) and the benzylbutyrolactone derivative 7. These findings combined with spectroscopical evidence revealed the structure of podorhizol as a 2,3‐dibenzylbutyrolactone derivative.
Synthesen in der Carotinoid‐Reihe. 22. Mitteilung. Totalsynthese von Rhodoxanthin
Authors: Mayer H. , Montavon M. , Rüegg R. , Isler O. 
Published: December 2004

AbstractThe total synthesis of rhodoxanthin according to the scheme C14 + C12 + C14 is reported.
Développement électrolytique et photolyse de plaques minces d'halogénures d'argent
Authors: Fernández‐Garcia J. G. , Guillemin M. , Boissonnas Ch. G. 
Published: December 2004

AbstractThe silver grains, formed by the reduction of a monocrystalline surface of silver chloride (obtained by capillary ascension of molten chloride between two plates of glass), with an hydroquinone developer containing 1–2% of gelatine are orientated only in [001] planes.
Über Pterinchemie. 21., vorläufige Mitteilung [1]. Hydroxylierung der Tryptophans mittels Tetrahydropterin unter physiologischen Bedingungen
Authors: Viscontini M. , Mattern G. 
Published: December 2004

AbstractTryptophan wird an der Luft in wässeriger Lösung mittels Tetrahydropterin, Eisen(II) und Pyrophosphat unter physiologischen Bedingungen hydroxyliert, wobei das Substrat an verschiedenen Stellen angegriffen wird. Isoliert wurden 5‐Hydroxytryptophan, Melanin, Kynurenin, 3‐Hydroxykynurenin, Xanthommatin, ferner einfache Indolderivate und α‐Aminosäuren. Die Gesamtausbeute an Umwandlungsprodukten, die in 1½ Stunden unter milden Bedingungen erhalten wurden, entspricht 2–3% des eingesetzten Tryptophans.
Recherches sur la biochimie des cyclitols X. Sur les cyclitol‐déshydrogénases d'Acetobacter suboxydans I
Authors: Rapin A. , Haenni A. L. , Posternak Th. 
Published: December 2004

Abstract(1) On a étudié deux souches d'Acetobacter suboxydans désignées comme HL I et HL II, qui oxydent en monocétones les cyclohexanediols‐1,2 cis et trans et le cyclohexanetriol‐1,2,3/0(cyclitols inférieurs). Contrairement à la souche d'A.sub. KLUYVER de LEEUW, elles ne s'attaquent pas aux cyclitols supérieurs contenant au moins 4 OH voisins.
Recherches dans la série des cyclitols XXXVI. Oxydations biochimiques de cyclohexane‐tétrols et ‐triols et d'un méthoxy‐cyclohexanediol
Authors: Barbezat P. , Reymond D. , Posternak Th. 
Published: December 2004

AbstractL'oxydation par Acetobacter suboxydans KLUYVER‐DE LEEUW des (±)‐cyclohexanetétrols‐1,2,4/3 et ‐1,2,3/4 et du (±)‐cyclohexanetriol‐1,2/3 comporte une attaque de l'hydroxyle axial de chacun des antipodes des trois substrats. Cette oxydation est due aux déshydrogénases particulaires qui s'attaquent aux cyclitols supérieurs. Sous l'action d'une épimérase contenue dans les bactéries, les cétoses dérivés du (+)‐cyclohexanetétrol‐1,3,4/2 et des (+)‐ et (−)‐cyclohexanetétrols‐1,2,3/4 sont convertis en cétoses épimères.
Ternäre Komplexe in Lösung II. Einfluss von 2,2′‐Bipyridyl auf die Stabilität des Cu2+‐Glycin‐1:1‐Komplexes
Authors: Sigel Helmut , Griesser Rolf 
Published: December 2004

AbstractThe stability constant of the Cu2+‐2,2′‐bipyridyl‐glycine complex (log K = 7,88) was measured and compared with that of the binary Cu2+‐glycine complex (log K = 8,27). The value Δ log K = −0,4 (cf. equation (3)) is in the order which should be expected for the coordination of a mixed ON‐ligand to (Cu‐Bipy)2+ which results in the formation of a ternary complex (cf. [1]).
De la chimie des ptérines. 22e communication [1]. Sur le mécanisme d'oxydation des tétrahydroptérines et plus particulièrement de la méthyl‐5‐diphényl‐6,7‐tétrahydro‐5,6,7,8‐ptérine
Authors: Viscontini M. , Okada T. 
Published: December 2004

AbstractOn décrit comment la méthyl‐5‐diphényl‐6,7‐tétrahydro‐5,6,7,8‐ptérine s'autoxyde en milieu alcalin en utilisant un atome‐équivalent d'oxygène pour former l'hydroxy‐4a‐méthyl‐5‐tétrahydroptérine quinolique correspondante. L'oxydation est catalysée par Fe3+, qui forme d'abord un complexe avec la tétrahydroptérine. Dans ce complexe un électron est transféré de la tétrahydroptérine sur le fer. Un mécanisme radicalaire d'oxydation des tétrahydroptérines, basé sur ces données expérimentales, est proposé et discuté.
Gas‐chromatographische und massenspektrometrische Untersuchung von Phytylubichinon, Vitamin K1 und Vitamin K2
Authors: Vetter W. , Vecchi M. , Gutmann H. , Rüegg R. , Walther W. , Meyer P. 
Published: December 2004

AbstractThe trimethylsilyl ethers of reduced vitamins K1, K2, and of phytylubiquinone were investigated by means of gas chromatography and mass spectrometry.
Die Glykoside der Blätter von Isoplexis canariensis (L.) G. DON. 2. Mitteilung
Authors: Spengel Sigrid , Hauser Emil , Linde Horst H. A. , Vaz Anthony X. , Meyer Kuno 
Published: December 2004

AbstractAus den getrockneten Blättern von Isoplexis canariensis liess sich nach leichter Abänderung des früher [2] beschriebenen Verfahrens in etwa 1% Ausbeute ein Kristallisat gewinnen, das aus den zwei Glykosidgemischen «A» und «B» im ungefähren Verhältnis 1:4 besteht. Diese unterscheiden sich nur im Zuckerteil ‐ Canarobiose beim Glykosid «A» und Digilanidobiose beim Glykosid «B» ‐ und besitzen die gleichen Aglykone: Uzarigenin, Canarigenin und Xysmalogenin. −2 der 3 Komponenten des Glykosids «A», nämlich Uzarigenin‐glucosido‐canarosid und Canarigenin‐glucosido‐canarosid, konnten als einheitliche Kristallisate gewonnen und in die Desglucoprodukte übergeführt werden. Das der 3. Komponente des Glykosids «A» entsprechende Desglucoprodukt, das Xysmalogenin‐canarosid, liess sich aus dem Monosidgemisch «e» [2] (das aus «A» durch enzymatische Hydrolyse entsteht) gewinnen. ‐Das Glykosid «B» konnte bisher noch nicht in seine 3 Komponenten aufgeteilt werden. Aus seinem Monosidgemisch «d» wurden Uzarigenin‐digitoxosid sowie Canarigenin‐digitoxosid als einheitliche Glykoside und, nach saurer Hydrolyse, Xysmalogenin, das Aglykon des dritten Digitoxosids von «d», gewonnen. ‐ Aus den Mutterlaugen der Glykosidgemische «A» und «B» konnten noch die Substanzen C und «D» erhalten werden. C ist Canarigenin‐glucosido‐fucosid, während «D» ein Gemisch mehrerer Glykoside darstellt.
Über Inhaltstoffe von Achillea santolinaL. (Compositae). 1. Mitt.: Die Stereochemie von Desacetoxy‐matricarin
Authors: Linde Horst H. A. , Ragab Mohamed S. 
Published: December 2004

AbstractDie Stereochemie des Santolins = Desacetoxy‐matricarins = Leukodins wird abgeklärt.
Recherches sur la formation et la transformation des esters LXXVI [1] Sur la réaction de l'isocyanate d'o‐méthoxycarbonyl‐phényle avec quelques acides amino (ou hydrazino) alcoyl‐orthophosphoriques et ‐sulfuriques
Authors: Cherbuliez Emile , Espejo O. , Jindra H. , Rabinowitz J. 
Published: December 2004

Abstracto‐Methoxycarbonyl‐phenyl isocyanate reacts with mono‐aminoalkyl orthophosphoric and sulfuric acids to yield the corresponding 1,2,3,4‐tetrahydroquinazoline‐2,4‐dione‐3‐ethyl phosphoric (or sulfuric) monoesters which are isolated as sodium salts. 1,2,3,4‐Tetrahydroquinazoline‐2,4‐dione‐3‐ethyl phosphoric acid has been isolated by adding hydrochloric acid to an aquous solution of its sodium salt.
Zur Struktur von H3Co(CN)6 und Ag3Co(CN)6
Authors: Ludi A. , Güdel H. U. , Dvořák V. 
Published: December 2004

AbstractThe X‐ray powder patterns of H3Co(CN)6 and Ag3Co(CN)6 have been indexed on the basis of a hexagonal unit cell:

equation image

The length of the NXN‐bond along the c‐axis is 3.29 Å for X  H and 4.24 Å for X  Ag. These distances are in agreement with data obtained from infrared spectra and with structural properties of similar compounds.
Chronoamperometrische Untersuchung der Thalliumabscheidung aus methanolischer Lösung an einer Silberelektrode vom Kammertyp
Authors: Schmidt E. , Wüthrich N. 
Published: December 2004

AbstractUnter Anwendung einer chronoamperometrischen Dünnschichtmethode wurde die Abscheidung von Thallium auf Silberelektroden aus methanolischen Perchloratlösungen auf Kationenmonoschichtbildung hin untersucht. Die erhaltenen Stromspannungskurven unterscheiden sich nur wenig von den Chronoamperogrammen entsprechender wässeriger Lösungen, woraus geschlossen wird, dass die innerste Region der starren Doppelschicht der Silberelektrode in Gegenwart des Thalliumadsorbats in Wasser und Methanol im wesentlichen die gleichen Eigenschaften besitzt.
Sur la réaction fluorescente de l'acide borique avec l'hydroxy‐2‐methoxy‐4‐chloro‐4′‐benzophénone (HMCB) en milieu sulfurique‐acétique concentré et sur le rôle de certaines propriétés du milieu
Authors: Marcantonatos M. , Monnier D. 
Published: December 2004

AbstractBy analogy with some colour reactions of boric acid, the intensity of fluorescence emission of the “boric acid‐2‐hydroxy‐4‐methoxy‐4′‐chloro‐benzophenone” complex is found to be considerably increased in glacial acetic‐concentrated sulfuric acid medium. This effect is studied with relation to some properties of the medium, especially acidity and viscosity.
Lineare Korrelation der chemischen Verschiebung der Vinylprotonen mit den LCAO‐MO‐π‐Elektronendichten in meta‐ und para‐substituierten Styrolen und Zimtsäuren
Authors: Wehrli F. W. , Pretsch E. , Simon W. 
Published: December 2004

AbstractA linear correlation was found between the proton chemical shifts of the vinyl protons in m/p‐substituted styrenes and cinnamic acids and the π‐electron densities of the corresponding carbon atom, calculated by the simple LCAO‐MO procedure, using standard values for the perturbation parameters.
Reduktive Photoalkylierung des Flavinkerns und Flavinkatalysierte Photodecarboxylierung von Phenylacetat Studien in der Flavinreihe. 15. Mitteilung [1]
Authors: Walker W. H. , Hemmerich P. , Massey V. 
Published: December 2004

AbstractStructure and properties of leucoflavin derivatives obtained through flavinsensitized photodecarboxylation of phenylacetate ions are described. The photoreduction of flavin with phenylacetate as donor is shown to be a quantitative photoalkylation, the benzyl residue entering either position 5 (nitrogen) or the bridge position 4a (carbon) of the flavin nucleus, depending on the conditions. The isomers were isolated, and identified by IR., NMR., and elementary analysis. The benzyl residue migrates from N(5) to C(4a) upon heating.
Die Glykoside der Wurzeln von Asclepias swynnertonii S. Moore. Glykoside und Aglykone,303. Mitteilung
Authors: Jäggi Kurt , Kaufmann H. , Stöcklin W. , Reichstein T. 
Published: December 2004

AbstractThe roots of Asclepias swynnertonii S. Moore are very rich in glycosides, the major portion being pregnane glycosides besides small amounts of cardenolides. Six cardenolides could be identified by means of chromatography: coroglaucigenin, ascleposide, uzarigenin, uzarin, corotoxigenin and frugoside, of which the first two mentioned substances could be preparatively isolated.
Dünnschichtchromatographie als Hilfsmittel in der Radiochemie. 2. Mitteilung [1]. Untersuchung von Produkten der Neutronenbestrahlung einiger anorganischer Salze
Authors: Seiler H. , Seiler M. 
Published: December 2004

AbstractThe chemical fate of sodium pyrophosphate and sodium salts of chloro‐acids in neutron irradiation, and the influence of the presence of metal‐ions was investigated by using thinlayer chromatography for separations of reaction products, and radiometric measurements.
Fragmentierung von α‐Aminoketoximen. IV. Teil Der Einfluss sterischer. Faktoren Fragmentierungsreaktion, 17. Mitteilung
Authors: Grob C. A. , Sieber A. 
Published: December 2004

Abstract(N‐Methyl‐2‐piperidyl)phenyl ketoxime acetate(10b) and (N‐methyl‐2‐pyrrolidinyl)‐phenyl ketoxime acetate (13b) undergo quantitative fragmentation in 80% ethanol to yield benzonitrile and the cyclic imonium salts 11 and 14. Their reaction rates are approx. 107 and 108, respectively, as high as those calculated for the homomorphous compounds, viz. 2‐methylcyclohexylphenyl ketoxime acetate (12b) and 2‐methylcyclopentylphenyl ketoxime acetate (15b), which undergo quantitative Beckmann rearrangement. Synchronous fragmentation therefore provides a very large driving force for ionisation, even when the stereo‐electronically suitable conformation is not the prevalent one, as with 10b.
Fragmentierung von α‐Aminoketoximen. V. Teil. (2‐Chinuclidinyl)‐phenyl‐ketoxim. Zur Gültigkeit der BREDTschen Regel bei energiereichen Zwischenstufen Fragmentierungsreaktionen, 18. Mitteilung
Authors: Grob C. A. , Sieber A. 
Published: December 2004

AbstractThe reaction of (2‐quinuclidinyl) phenyl ketoxime tosylate (1) in aqueous ethanol or tetrahydrofuran yields 10 to 20% of benzonitrile and 4‐piperidyl‐acetaldehyde (6), the tautomer of 2‐quinuclidinol (5), besides N‐(2‐quinuclidinyl)‐benzamide (4). In phenol some 2‐phenoxyquinuclidin (21) and benzonitrile are obtained besides phenyl N‐(2‐quinuclidinyl)‐benzimidate (20). Furthermore, the α‐aminoketoximetosylate 1 reacts 2 to 4 times as fast as the homomorphous (bicyclo[2.2.2]‐2‐octyl) phenyl ketoxime tosylate (7). By contrast the latter untergoes quantitative Beckmann rearrangement to the amide 12.
Sur les relations entre structure polypeptidique et activité Strépogénique. 1. Peptides de la cystine
Authors: Baudet P. , Borecka I. , Cherbuliez E. 
Published: December 2004

AbstractThe authors propose for the characterization of strepogenic substances of known composition the specific activity, i. e. the number of WOOLLEY units per μmole.Starting from L‐leucyl‐L‐cystinyl‐L‐leucyl‐L‐valyl‐L‐glutamic acid (of very high strepogenine activity, 400 WOOLLEY units per mg, 230 WOOLLEY units per μmole) seven peptides have been synthesized by suppression and/or replacement of amino acid residues. A study of the relation between activity and structure of these peptides shows that:

In this group cystine is an indispensable element for activity.
This amino acid must either be linked on each side to leucine residues or linked by its carboxyles to leucine, its amino groups being free.
From these results, the conception emerges that the strepogenine polypeptides may be characterized by an amino acid (in this group of peptides, cystine) which must be linked to particular amino acid residues. If this conception is correct, there should exist several types of strepogenines depending on the nature of the amino acid essential for their activity.
Zur informationstheoretischen Deutung der thermodynamischen Mischungsfunktionen einiger einfacher Gittermodelle
Authors: Milićević B. 
Published: December 2004

AbstractThe thermodynamic functions of mixing for some simple lattice models (perfect, athermal, and simple mixtures) have been derived by means of SHANNON'S uncertainty measure and the fundamental ideas of JAYNES' information‐theoretical formalism.
Elektromotorische Eigenschaften eines Gallium‐Silicium‐Kalium‐Glases zur Messung von Kaliumionen‐Aktivitäten
Authors: Štefanac Z. , Simon W. 
Published: December 2004

AbstractA gallium glass for the measurement of potassium ion activity is described. The corresponding glass electrodes show a selectivity for potassium over sodium of about 10.
Methode zur Konstitutionsaufklärung der Reaktionsprodukte der Umsetzung von Cellulose mit Formaldehyd. 18. Mitteilung über textilchemische Untersuchungen [1]
Authors: Patel S. , Rivlin Joseph , Samuelson T. , Stamm O. A. , Zollinger H. 
Published: December 2004

Abstract(1) A method is described which allows the elucidation of the structure of cotton cross‐linked with formaldehyde. It consists of a permethylation process (5 methylations with dimethyl sulphate and sodium hydroxide in dimethyl sulphoxide, followed by two exchange methylations of the formalised sodium cellulosate with methyl iodide in n‐butanol), hydrolysis of the product in 72% sulphuric acid to the respective methylated glucoses, reduction of the mixture of glucoses to the respective sorbitols, blocking of all free hydroxyl groups by acetylation, trifluoroacetylation or formation of trimethylsilyl ethers, and vapour phase chromatographic separation of the derivatives.(2) It is shown that after permethylation practically no free hydroxyl groups can be detected and that scarcely any replacement of methylene or oxymethylene cross‐links by methyl groups has taken place. With the exception of losses in filtration of the permethylation product, all stages of the process proceed on an almost quantitative basis.
Lösungsmitteleffekte in Kernresonanzspektren gesättigter Kohlenwasserstoffe
Authors: Winkler T. , Von Philipsborn W. 
Published: December 2004

AbstractProton NMR solvent effects ν(CCl4) – ν(C6H6) have been measured for the methyl groups in 25 saturated cycloalkanes. Magnitude and sign of the Δ values are correlated with the molecular shape. The results are discussed with particular respect to stereochemistry, and they provide a new method for distinguishing between geometrical isomers.
Die Electronenzustände von Perimeter‐π‐Systemen: III. Das Elektronenspektrum des 1,6‐Methano‐[11] annulenium‐Kations
Authors: Grimme W. , Heilbronner E. , Hohlneicher G. , Vogel E. , Weber J. P. 
Published: December 2004

AbstractThe electronic spectra and the polarisation of the transitions have been determined for the 1,6‐methano‐[11] annulenium cation III and the 4,6‐dimethyl‐1,2‐benzotropylium cation IV. The observed sequence of polarisation of the prominent bands corresponding to the lowest electronically excited states is in agreement with the predictions derived from molecular orbital models of the PARISER‐PARR‐POPLE type. The influence of partial conjugation between the bridged centre and of the inductive effect of the methylene group in III has been investigated.
Synthese von 2‐ und 3‐(1,2,3,6‐Tetrahydropyridyl)‐indolen
Authors: Beck D. , Schenker K. 
Published: December 2004

AbstractThe synthesis of a series of 2‐ and 3‐(1,2,3,6‐tetrahydro‐4‐pyridyl)‐indoles by reduction of the corresponding pyridinium compounds with sodium borohydride is described. A substantially improved mode of preparation for 3‐(4‐pyridyl)‐indole is given.
Reaktionen von Steroid‐Hypojoditen IX. Beitrag zum Mechanismus der oxydativen Cyanhydrin‐Cyanketon‐Umlagerung Über Steroide, 212. Mitteilung
Authors: Kalvoda J. 
Published: December 2004

AbstractThe intramolecular character of the oxidative cyanohydrin‐cyanoketone rearrangement has been proven by cross experiments using 14C‐labeled compounds. The shown stereochemical requirements of the reaction and its analogy to the hypoiodite oxidation [3] of monohydric alcohols lead to the formulation of a reaction mechanism involving an internal addition of a carbon radical centre to the triple bond of a cyano group.
Organische Phosphorverbindungen XXXI. Ein einfaches Verfahren zur Herstellung von Alkylen‐ bzw. Arylen‐ bzw. diphosphiniten und von Bis‐(dialkyl‐ und diaryl‐phosphinyl)‐alkanen
Authors: Maier Ludwig 
Published: December 2004

AbstractThe reactions of dialkylamino‐dialkyl‐ or diaryl‐phosphines, R2PNR′2 (R = C6H5 C4H9, C2H5; R′ = CH3, C2H5) with unsaturated alcohols, functional alcohols, α, ω‐alkane‐diols and α, ω‐alkane‐dithiols have been studied. The preparation of a large number of alkylene (or arylene) bis‐phosphinites and of bis‐phosphinyl‐alkanes is reported and their physical properties listed.