bluuebunny/crossref_metadata_2025 huggingface dataset:
Zur Tryptophanpyrrolase-Aktivität in der embryonalen Hühnerleber
Authors: Leibenguth Friedrich
Published: March 2015

Es wird der Verlauf der Tryptophanpyrrolase-Aktivität vom 6. Bebrütungstage bis zum Schlüpfen in der embryonalen Leber von Hühnern der Rasse Cathlines verfolgt sowie die Beeinflussung der Aktivität durch Folsäure im in vitro-Versuch und nach Injektion von Testosteronpropionat und 5-Fluoruracil getestet.

Die Kynureninformylase wird als im Überschuß vorhanden angesehen. Die Tryptophanpyrrolase-Aktivität steigt vom 5. bis 8. Tag langsam an, schnellt dann innerhalb von 3 Tagen auf den vierfachen Betrag und sinkt bis zum Schlüpfen allmählich wieder ab. Der Aktivitätsverlauf wird mit der zweiphasigen Wachstumskurve der Leber verglichen. Testosteronpropionat-Gaben beeinflussen sowohl im Lang- als auch im Kurzzeitversuch weder die Tryptophanpyrrolase noch das Leberwachstum noch die Regression des rechten Müller sehen Ganges bei weiblichen Embryonen. Das Basenanaloge 5-Fluoruracil hat je nach Entwicklungsstadium und Einwirkungsdauer einen fördernden oder hemmenden Einfluß auf die Aktivität der Tryptophanpyrrolase. Ob der erstere der beiden Effekte in der Aufhebung einer cytoplasmatischen Repression des Enzyms besteht, kann noch nicht entschieden werden.
Untersuchungen zur Faraday - Spektroskopie
Authors: Haberditzl W. , Köppel H.
Published: March 2015

Mit einer lichtelektrischen Faraday - Apparatur wurde die Dispersion der Magnetooptischen Rotation (MOR) verschiedener hexakoordinierter, oktaedrischer Co (II) - und Co (III) -Komplexe im sichtbaren und nahen UV-Wellenlängenbereich gemessen. Als Solventen wurden H2O, Dimethylsulfoxid und Dimethylformamid verwendet. Die durch Darstellung der spezifischen Drehung [α]sp als Funktion der Wellenlänge gewonnenen MOR-Spektren zeigen einen charakteristischen anormalen Dispersionsverlauf. Die bisherigen MOR-Messungen sowie die anormale Frequenzabhängigkeit der Spektren werden zusammenfassend interpretiert.
Vanadates of Lead (II): An Electrometric Study
Authors: Saxena R. S. , Jain M. C.
Published: March 2015

The formation and compositions of lead vanadates formed by the interaction of lead nitrate and different alkali vanadates (ortho, pyro, meta and poly) have been investigated by means of pH, e.m.f. and conductometric titrations between the reactants at several concentrations in the presence of 20% alcoholic media. The well defined breaks and inflections in titration curves provide definite evidence for the formation and precipitation of ortho-3PbO · V2O5, pyro-2PbO · V2O5 and meta-PbO · V2O5 vanadates of lead at pH ranges 7.5-9.0, 5.75-7.25 and 4.25 — 5.25 respectively.
Zum Mechanismus der Eigenhalbleitung einiger Trithione
Authors: Eicke Hans Friedrich
Published: March 2015

Apparent conductivities as a function of temperature have been determined for a number of trithiones in the solid state. An assumption proposed by MANY, HARNIK, and GERLICH permitted assessment of their charge carrier mobilities. A possible conduction mechanism has been discussed based on a rough correlation between mobilities and activation energies.
Thymidinkinase in bestrahltem Weizen
Authors: Kern Hartmut
Published: March 2015

Im Rahmen vergleichender strahlenbiologischer Untersuchungen an Weizensorten unterschiedlicher Sensibilität gegenüber Röntgenstrahlen 1.2 werden z. Z. biochemische Analysen durchgeführt. Die Einwirkung ionisierender Strahlung führt zu einer dosisabhängigen Keimverzögerung, damit verbunden zu unterschiedlicher Reduzierung von Nucleinsäure- und Proteinsynthesen und u. a. zur Hemmung und schließlich zur Einstellung der Mitosetätigkeit. Trocken bestrahlte Karyopsen bieten die Möglichkeit, den Übergang aus dem Ruhezustand in die ersten Phasen der Keimung zu verfolgen und dabei kausale Zusammenhänge zwischen Strahlenursache und deren Wirkung zu erfassen.
Über die Schwingungsspektren von Silber- und Thallium-Oxoanionen und ihre Deutung
Authors: Baran Enrique J. , Aymonino Pedro J. , Müller Achim
Published: March 2015

Die Valenzschwingungen zahlreicher Ag- und Tl-Salze von Oxoanionen sind gegenüber anderen Salzen stark nach kleineren Wellenzahlen verschoben. Entsprechendes gilt auch für Thio- und Nitridoanionen. Dieser Befund läßt sich durch die Ausbildung von schwachen kovalenten Bindungen zwischen Ag bzw. Tl und den Anionen deuten, da dies zur Schwächung der α-Bindungen im Anion führt.
1H-NMR chemische Verschiebungen von Thiocarbonsäure-äthylestern
Authors: Radeglia Reiner , Scheithauer Steffen , Mayer Roland
Published: March 2015

We follow the changes of the chemical shifts of both the methylen groups and of the methyl group in esters of the type R-CH2-COO-CH2-CH3, R-CH2-COS-CH2-CH3, R-CH2-CSO -CH2 -CH3, and R -CH2 -CSS -CH2 -CH3. In passing from the normal ester to the thiol, thion, and dithio ester the chemical shifts of the groups mentioned change by characteristic amounts independent from R for the investigated systems. Deviations from the increment system are discussed.
Radioprotective Effect of 5-Azacytidine in AKR Mice
Authors: Veselý J. , Gostof R. , Čihák A. , Šorm F.
Published: March 2015

The administration of 5-azacytidine to mice (AKR strain) prior to irradiation with a supralethal close of X-rays markedly reduces their mortality. In the pretreated animals the number of blood leukocytes and of bone marrow nucleated cells is considerably higher than in the animals that have been only irradiated. It is supposed that the radioprotective effect of 5-azacytidine favourably influences the proliferation of the stem-cells which are responsible for the repopulation of the bone marrow.
Infrarot-Spektren von Pyryliumperchloraten
Authors: Arnold G.
Published: March 2015

The influence of substituents and the aromatic systems to the characteristic infrared frequencies of benzo-. naphtho[1,2-b], and naphtho[2,1-b] pyrylium salts have been investigated. A change of the carbonium structure to a oxonium structure of the pyrylium cation can be observed by special substituents in α-position of the pyrylium ring which strongly increase the conjugation in the pyrylium system.
Untersuchungen über die Oberflächenstruktur des Thylokoidsystems der Chloroplasten mit Hilfe von Antikörpern gegen die Ferredoxin-NADP-Reduktase
Authors: Berzborn Richard J.
Published: March 2015

Our earlier results are confirmed by new experiments with ultrasonically disrupted isolated thylakoid systems and with “broken chloroplasts”: Chloroplast membrane systems are not agglutinated directly by antisera against ferredoxin-NADP reductase, although this protein is an integral part of the surface of the thylakoids. An indirect agglutination of the preparations, however, occurs, when the thylakoid systems are incubated with antisera against the reductase and then an antiserum against rabbit-γ-globulin or soluble reductase is added. Therefore the hypothetical deepenings discussed in the former publication must be located in the surface of the outer membranes of the thylakoid stacks. The thylakoid systems cannot be agglutinated directly by antibodies against reductase, because the antibody molecules are too short to connect the reductase located in the deepenings of the particles. The minimum depth of the cavities therefore must be about 60 A. The maximum depth is estimated experimentally to be about 200 A.

By treatment with EDTA the molecular structure of the thylakoid surface is altered in such a manner, that after this treatment the thylakoid systems can be agglutinated by antibodies against reductase directly. This treatment with EDTA is said to detach protruding knobs of the coupling factor of the photosynthetic phosphorylation. Thus our results are in agreement with the hypothesis, that the coupling factor is a protruding knob. Ferredoxin-NADP reductase would be located in the surface of the outer membranes of the thylakoid system between the knobs. - Other possible hypotheses to explain our immunological results are excluded by several control experiments.
Photovoltaic Effect of Acriflavine in Collodion Film
Authors: Tomita Giiti
Published: March 2015

The photovoltaic effects of free and bound acriflavine were studied to find the elemenatary processes in photochemical behaviours of the dye. The observed photopotential in aqueous acriflavine solution is positive or negative against the dark electrode, depending on pH. The positive sign implys that the photoreduction of dye is more predominant than the photooxidation. The negative sign is obtained when the photooxidation is the predominant reaction.

Using the electrode coated directly or indirectly with a very thin film of acriflavine-dispersed collodion, the contributions from photo-reduction and -oxidation to the photopotential were separated. The spectral sensitivity of photopotentials gives us an useful information about the oxidationreduction mechanism of bound dyes. The photo-ejection of an electron from the excited singlet state of dye molecule, which was considered by LIM and others1 to be responsible for the delayed fluorescence of acriflavine in rigid media, seems to be favourable for understanding of photopotential properties at shorter wavelengths of excitation.
Synthese von Diaza[4.4]spirenen
Authors: Dürr Heinz , Schrader Lutz
Published: March 2015

The synthesis of substituted diaza [4.4] spirenes (3) by 1.3-dipolar addition of diazo-cyclopentadienes to alkynes is described. If the 1- or 4-position of the diazo-cyclopentadienes contains an H-atom, bicyclic pyridazine derivatives are formed with alkynes. The uv-spectra of the diaza [4.4] spirenes (3) are discussed with regard to the new term “spiroconjugation”.
Synthese und Eigenschaften von 3-Äthoxy-1.2-dithiolium-Salzen
Authors: Faust J. , Fabian J.
Published: March 2015

Die farblosen, feuchtigkeitsempfindlichen 3-Äthoxy-1.2-dithioliumfluoborate (1, X = BF4) können durch Umsetzung von 1.2-Dithiolonen- (3) (2) mit Triäthyloxoniumfluoborat in Dichlormethan erhalten werden. Das Fluoborat-Anion ist austauschbar, ein nucleophiler Angriff ist an verschiedenen Stellen des reaktionsfähigen Moleküls möglich. Dialkylsulfate, Alkyltosylate und Alkylhalogenide sind zur Alkylierung der 2 ungeeignet, die Umsetzung von 3-Chlor-1.2-dithiolium-Salzen (4) mit Alkoholen führt ebenfalls nicht zu 3-Alkoxy-1.2-dithiolium-Verbindungen.

Die charakteristischen Absorptionen der 3-Äthoxy-1.2-dithioliumionen (1) im Ultravioletten werden angegeben und durch SCF-LCI-PPP-Berechnungen theoretisch abgeleitet. Ein Vergleich dieser Absorptionen mit den Spektren der 1.2-Dithiolone-(3) (2) in konzentrierter Schwefelsäure zeigt, daß die Carbonyl-Verbindungen unter diesen Bedingungen am Sauerstoff protoniert werden.
Einfluß von Effektoren auf Molekulargewicht und Aktivität der Glutamat-Dehydrogenase (GluDH) aus Rinderleber in vitro.
Authors: Mosebach K.-O. , Kempfle M.
Published: March 2015

We studied the molecular weight of cristalline GluDH from beef liver 1) in different dilutions, 2) after treatment with NADH and diethylstilbestrol. 3) after treatment with 6 M guanidine-HCl. When we diluted GluDH there was a spontaneous dissociation of the molecule into subunits. The molecular weight decreased from 2,000,000 (at 20 mg/ml) to 310.000 (at 0.01 mg/ml). After concentrating the solution again we got back the associated molecule. After treatment with NADH and diethylstilbestrol we obtained a dissociation of GluDH into subunits, too, but with a significant loss of enzymatic activity. This effect is reversibel — after dialysis we found the associated molecule again. When we treated GluDH with 6 M guanidine-HCl we found a complete dissociation of the molecule into subunits with a molecular weight of 52,000. This treatment caused an irreversibel loss of enzymatic activity.
Reaktionen der Hydrogenase aus Rhodopseudomonas capsulata im partikelgebundenen und gelösten Zustand
Authors: Klemme J.-H.
Published: March 2015

In cell free extracts of Rps. capsulata obtained by exposure of cells to ultrasonic oscillation, about 90% of the hydrogenase is associated with the particulate chromatophore fraction. The particulate enzyme reacts with methylene blue (MB), menadione, phenazonium methosulfate (PMS), dichlorophenolindophenol (DCPIP), cytochrome c, p-benzoquinone (BQ), ferricyanide and O2,, but does not react with benzylviologen (BV), pyridinnucleotides and flavinnucleotides. Treatment of chromatophores with sodiumlaurylsulfate inactivates the hydrogenase reaction with PMS, DCPIP, BQ and ferricyanide. The MB-linked or menadione-linked hydrogenase is not destroyed by the detergent. The hydrogenase reaction with BV is increased more than 20-fold after incubation of the chromatophores with the lipid-dispersing agent. Treatment of chromatophores with acetone and petroleum ether almost completely inactivates the hydrogenase reaction with PMS and BQ. The reaction rate of the DCPIP-linked and the ferricyanide-linked hydrogenase is somewhat decreased, whereas the MB-linked, the menadione-linked and the BV-linked hydrogenase reactions still exhibit about 100% of the original activity. By extraction of the acetone-treated chromatophores with glycine-NaOH-buffer (pH 9), about 10 — 15% of the particulate hydrogenase is solubilized. The enzyme was 9-fold purified by ammonium sulfate precipitation and chromatography on DEAE-cellulose. The purified enzyme contains no cytochrome. The relative reaction rates of the solubilized enzyme with different electron acceptors are similar to the corresponding reaction rates of the acetonetreated chromatophores. Extraction of chromatophores with n-butanol results in the solubilization of 5 — 10% of the particulate enzyme. By extraction of acetone-treated chromatophores with 0,5% Triton X-100, 40% of the particulate hydrogenase is solubilized. The fractionation of the extract with ammonium sulfate results in the isolation of a cytochrome c-containing particle which exhibits a 3-fold increased hydrogenase activity.
Zur Kenntnis der Umsetzung von 3H-Trichlorphon zu DDVP
Authors: Dedek W. , Koch H. , Uhlenhut G. , Bröse F.
Published: March 2015

Aus 3H-markiertem Chloral wird C1-3H-markiertes Trichlorphon hergestellt und im wäßrigalkalischen Medium zu DDVP umgesetzt, wobei (83 ± 6) Prozent der im Trichlorphon eingesetzten 3H-Aktivität im DDVP wiedergefunden werden. Die Umlagerungsreaktion beginnt daher bevorzugt mit der Ablösung des Protons an der OH-Gruppe des Trichlorphons.
Zum Verhalten des mindertoxischen Insektizids 32P-Bromophos nach cutaner Applikation am Rind
Authors: Dedek Wolfgang , Schwarz Heinz
Published: March 2015

Nach cutaner Applikation von 20 mg/kp 32P-Bromophos an lactierende Rinder wurde die in Blut und Milch nachweisbare Aktivität untersucht. Durch Dünnschichtchromatographie konnte gezeigt werden, daß Bromoxon nicht als Metabolit auftritt und nur im Blut ~0,01 ppm Bromophos vorhanden ist. Als hauptsächlicher Metabolit entsteht wahrscheinlich Desmethylbromophos mit Konzentrationen von 0,4 — 0,7 ppm in Blut und Milch. Mit toxikologisch bedeutsamen Rückständen ist nach cutaner Applikation von Bromophos daher nicht zu rechnen.
Eine einfache Methode zur Synchronisation größerer Populationen des Ciliaten Tetrahymena pyriformis (EHRENBERG)
Authors: Hildebrandt Armin , Duspiva Franz
Published: March 2015

Wie viele andere Ciliatenarten, so phagocytiert auch Tetrahymena pyriformis Eisenpartikel. Die Phagocytose ist phasenspezifisch; Zellen in Teilungsphase nehmen kein Eisen auf. Auf diesem Verhalten beruht ein neues Ausleseverfahren zur Synchronisation größerer Populationen von Tetrahymena pyriformis Stamm GL bzw. HSM, das hier in Einzelheiten beschrieben wird. Der erzielte Synchroniegrad kann 70% betragen.
Electrometric Studies on Thorium Arsenates as a Function of pH
Authors: Saxena R. S. , Prasad Shiva
Published: March 2015

The formation and composition of thorium arsenates obtained by the interaction of thorium nitrate and different alkali arsenates (meta, pyro and ortho) at specific pH levels 7.2, 8.3 and 11.1 have been studied by employing electrometric techniques involving amperometric, pH, potentiometric and conductometric titrations. The results provide cogent evidence for the formation of three thorium arsenates having the molecular formulae ThO2·2 As2O5, ThO2·As2O5 and 3 ThO2·2 As2O5 in the vicinity of pH 4.2, 4.9 and 5.6 respectively. Analytical investigations of the compounds have also been carried out which substantiate the results of electrometric study.
Über Phosphazene, XXX.
Authors: Schmidpeter Alfred , Weingand Caspar , Hafner-Roll Elke
Published: March 2015

The ammonolysis of a chlorophosphorane is characterised by the side by side substitution and condensation competing with one another. The different results fit into one reaction model from which the determining factors may be derived. Within the normal temperature range condensation proceeds only as long as both Cl and NH2 functions at the phosphorus are present.

Presubstitution by dialkylamines reduces condensation. Thus the partially alkylsubstituted tetraamino phosphonium and hexaamino diphosphorus nitride salts P (NR2)2(NH2)2
⊕, N [P (NR2) (NH2)2] 2⊕ and N [P (NR2) 2 (NH2)] 2⊕ are synthesised.
Ternäre E-Phasen von Hauptgruppenelementen I.
Authors: Axel H. , Eisenmann B. , Schäfer Herbert , Weiss Armin
Published: March 2015

CaMgSi, CaMgGe und CaMgSn sind isotyp und kristallisieren im geordneten Anti-Blei (II) - chloridgitter. Im Gegensatz zu allen bisher bekannten E-Phasen sind in den neu aufgefundenen nur Hauptgruppenelemente enthalten.
Die primäre Proteinstruktur von Stämmen des Tabakmosaikvirus
Authors: Jauregui-Adell J. , Hindennach I. , Wittmann H. G.
Published: March 2015

The sequence of amino acids within the coat protein of the strain Holmes rib grass of tobacco mosaic virus (TMV) has been determined. In this communication the amino acid compositions of the coat protein and of all tryptic peptides are reported. Furthermore the experimental details are given for the elucidation of the amino acid sequences within the first three tryptic peptides, containing 61 amino acids.

It has been found that the strain Holmes rib grass differs very extensively in the primary structure from the other TMV strains whose sequences are known. It differs from each of the other strains in more than 50% of the amino acid positions and it contains two amino acids less per protein subunit than the other TMV strains.
Die primäre Proteinstruktur von Stämmen des Tabakmosaikvirus
Authors: Wittmann H. G. , Hindennach I. , Wittmann-Liebold B.
Published: March 2015

Experimental data for determining a) the amino acid sequences of eight tryptic peptides containing 95 amino acids and b) the order of the tryptic peptides are given. Combining the data of this and of a previous paper the complete amino acid sequence of the coat protein of the TMV strain Holmes rib grass (HRG) is established (Fig. 5). It is compared with three other TMV strains the sequences of which have been determined before (Fig. 6).

Differences and similarities between the sequences of the four TMV strains are discussed. HRG has a deletion of two amino acids and it is the most distantly related of the four TMV strains. When the sequence of HRG is compared to that of any of the other strains it turns out that in each case more than 50% of the 156 positions contain different amino acids (Fig. 7).

The number of positions with the same amino acid in all strains and mutants so far studied is 30 per cent. These positions are not randomly distributed but clustered mainly in two regions. This finding probably reflects the restriction of amino acid exchanges by the spatial structure of the viral rod.
Sphingolipide und Glykolipide von Pilzen und höheren Pflanzen.
Authors: Wagner H. , Zofcsik W. , Heng I.
Published: March 2015

Aus der Phosphatidfraktion der Erdnuß (Arachis hypogaea L.) wurde ein phosphorhaltiges Sphingoglykolipid isoliert, das in der qualitativen und quantitativen Zusammensetzung seiner Sphingosinbasen, Fettsäuren und Zuckerbausteine mit dem Phytoglykolipid (PhGL) aus Soja und Mais große Ähnlichkeit aufweist. Nach dem Ergebnis der Mol.-Gew.-Bestimmungen ist für das Erdnuß-PhGL eine Polymerstruktur wahrscheinlich.
Untersuchungen des Verhaltens von Kephalin/Cholesterin-Membranen in Metallchloridlösungen
Authors: Berger R. , Fritz H. P.
Published: March 2015

Das Leitfähigkeits- und pH-Verhalten einer Kephalin/Cholesterin-Modellmembran wurde in Gegenwart von 0,1 M Metallchlorid-Lösungen untersucht. Bei den Lösungen der Erdalkalichloride, von CuCl2, CoCl2 und FeCl3 ergab sich eine deutliche Leitfähigkeitsabnahme als Funktion der Zeit.

Da einwertige Kationen aus der Membran gedrängt werden, wenn mehrwertige Ionen in der Lösung vorhanden sind und umgekehrt, muß ein lonenaustausch an solchen Modellmembranen angenommen werden, der sich durch pH-Messungen eindeutig sichern läßt.
Zum Verhalten von Spirobipyranen und ihren farbigen Formen
Authors: Schiele Cajetan
Published: March 2015

Ten types of symmetrically and asymmetrically synthesized spirobipyrans and their basic o-hydroxyarylvinylpyryliumsalts were investigated. A clearer understanding was achieved of the mechanisms involved in the processes from ring opening to the formation of colored species. The investigations were concerned with unsubstituted asymmetric spirobipyrans as well as those substituted in α-position to the spiro-C-atom in one of the double bonds of the pyran ring-systems. The purpose was to understand the behaviour of the compounds by measuring changes in their structural parameters.
Wechselwirkung pflanzlicher Wachstumshormone mit Membranen
Authors: Weigl Josef
Published: March 2015

A strong physical association of indoleacetic acid. 2.4-dichloro-phenoxyacetic acid, indolepropionic acid and indolebutyric acid with lecithin was found which might have physiological significance (regulation, polar mobility). The association is assumed to be mainly due to bonding between the complementary charged groups of the phospholipid and auxin molecules and to specific interaction of the more hydrophobic parts of the molecules.

The following interactions were established:

Lecithin dissolved in CCl4 moves indoleacetic acid and 2.4-dichloro-phenoxyacetic acid out of an aqueous phase. Cholesterol, long chain fatty acids and amines did not give this interaction with indoleacetic acid and 2.4-dichlorophenoxyacetic acid 4, 5.

1 mole lecithin was found to bind up to 0.8 mole indoleacetic acid. Cephalin and phosphatidylserin exhibit a weaker interaction. Indolepropionic acid and indolebutyric acid were found to compete with indoleacetic acid. There was no effective competition of benzoic acid, phenoxyacetic acid, phenylacetic acid, cholesterol and several fatty aids with indoleacetic acid for the binding sites on the lecithin molecule. 2,4-dichlorophenoxyacetic acid appears to be bound stronger than indoleacetic acid and phenoxyacetic acid. Indoleacetic acid and 2.4-dichlorophenoxyaetic acid were incorporated into swollen lecithin lamellae.

Similar interactions are to be expected for other hormones and phospholipids. The lipoprotein structures of cell membranes may be visualized to interact even more specificly with growth hormones than our model system. It is suggested that interaction of hormones with membranes should be considered in theories on regulation. Experiments on ion permeability indicate an influence of indoleacetic acid on cell membranes.
Phosphorylchloridfluorid-amid, Phosphoryldichlorid-amid und N-Trichlorphosphoranyliden-phosphoryl-chloridfluoridamid
Authors: Roesky H. W. , Niecke E.
Published: March 2015

Durch Umsetzung von Phosphoryltrihalogeniden mit Ammoniak in Äther konnte Phosphorylchloridfluorid-amid, Phosphoryldichlorid-amid und das bereits bekannte Phosphoryldifluorid-amid gewonnen werden.

Phosphorylchloridfluorid-amid reagiert mit Phosphorpentachlorid zu N-Trichlorphosphoranyliden-phosphoryl-chloridfluoridamid, O = PFClN = PCl3.

Die neuen Verbindungen werden durch ihre Elementaranalyse, IR-Spektren und 31P-, 19F- und 1H-KMR-Spektren charakterisiert.
Eine Synthese der Α-Kette des Schafinsulins unter ausschließlicher Verwendung säurelabiler Schutzgruppen
Authors: Zahn H. , Danho W. , Klostermeyer H. , Gattner H. G. , Repin J.
Published: March 2015

Die Α-Kette des Schafinsulins wurde als geschütztes Derivat Boc-Gly-Ile-Val-Glu (OBut) -Gln-Cys (Trt) - Cys (Trt) - Ala-Gly-Val-Cys (Trt) - Ser-Leu-Tyr (But) -Gln-Leu-Glu (OBut) - Asn-Tyr (But) - Cys (Trt) -Asn-OBzl ** aus fünf Fragmenten aufgebaut, durch Bromwasserstoff in Trifluoressigsäure von den Schutzgruppen befreit und zur Reinigung in das Tetra-S-sulfonat überführt. Nach Kombination mit B-Kette aus nativem Insulin lieferte das Präparat kristallines Insulin.
Zur Photosynthese grüner Pflanzen I: Versuche mit H2
18O und K2C18O3 an Chlorella pyrenoidosa Chick / Photosynthesis in Green Plants I. Experiments with H2
18O and K2C18O3 on Chlorella pyrenoidosa Chick
Authors: Budzikiewicz, H. , Inhoffen H. H.
Published: March 2015

1. A method is described for the simultaneous monitoring of H2O, O2, CO2 and their 18O-labelled analogs in experiments on the photosynthesis both of aquatic and terrestrial plants. The apparatus consists of a Varian-MAT mass spectrometer with a modified inlet system equipped at the entrance of the ion source with a polyethylene membrane permeable for H2O, O2 and CO2.

2. Experiments have been performed with Chlorella pyrenoidosa Chick. using H2
18O and K2C18O3 as substrates while H2O and O2 and CO2 in solution as well as their 18O-labelled analogs were monitored during dark and light periods.

3. It has been observed that the isotopic composition of the photosynthetic oxygen corresponds to that of the surrounding water and differs grossly from that of the dissolved CO2 and K2CO3. It is concluded that either H2O is the precursor of the photosynthetic oxygen or that in case CO2 is involved a very fast and complete equilibration between the latter and H2O has to occur after CO2 enters the cell.
Über das Verhalten der in Acrylamid getrennten löslichen Proteine aus Erbsenwurzeln bei verlängerter Elektrophorese-Dauer / Behaviour of the soluble Proteins of Pea Roots under extended Electrophoresis in Acrylamide Gels
Authors: Polter Conrad , Müller-Stoll W. R.
Published: March 2015

The soluble proteins from distinct sections of pea seedling roots, in different developmental stages, were separated by acrylamide disc-electrophoresis. Each time eight columns charged with the same protein preparation were separated simultaneously. Each column was subjected to electrophoresis seven minutes longer than the previous one. In this way the more quickly running protein bands left the columns step by step whereas the remaining ones broadened and in some cases split. In columns of the tip section only one new band was observed while those of the second section showed several new bands. The protein spectra of the differentiation stage of older root parts had the largest increase in number of bands. At present one can not decide wether the analogous bands from different root sections contain primarily different proteins or that the protein is oxidized at a different rate.
Strahleninduzierte freie Radikale in phosphoroorganischen Verbindungen II
Authors: Lassmann G. , Damerau W. , Lohs Kh.
Published: March 2015

The structure of radicals in X-irradiated polycrystalline phosphonic acid esters (trichlorphontype) and trichlorphon single crystals has been investigated by ESR. At room temperature in trichlorphon the radical (R0)2 > P(O) - CHOH - ĊCl2 (R = CH3) is formed by removal of a chlorine atom. The g-factor is 2,010 and the hyperfine parameters are αH
β= 7 ± 0,5 G for the isotropic β-proton and αCL= 7 - 14 G for the two anisotropic chlorine atoms.

The structure of this radical type is not influenced by a substitution of the methyl groups by larger alkyl groups (R = C2H5, C3H7, C4H9 etc.). ESR-spectra of some other irradiated insecticides are described.

Difficulties in the analysis of ESR spectra of aliphatic radicals with chlorine-hyperfine structure (especially quadrupole-effects) are discussed.
The Binding of Lithium Carmine to a2-Macroglobulin
Authors: Picard J. J. , Heremans J. F.
Published: March 2015

The colloidal dye lithium carmine was added in vitro to normal human serum. Electrophoretic experiments showed that the dye was associated mainly with α2-globulins, small amounts with the albumin and only traces with the γ-globulins. The main complex was eluted with the macroglobulin peak obtained by gel filtration on Sephadex G-200 and sedimented in the heavy fraction on density gradient ultracentrifugation. The dye-protein complex could be precipitated with an antiserum specific for a2-macroglobulin. Gel filtration of a solution of pure a2-macroglobulin, to which lithium carmine was added, demonstrated that the dye was bound to this protein.
Überschüssige Plastidenchinone in Blättern
Authors: Lichtenthaler H. K.
Published: March 2015

The synthesis of plastidquinones was studied during the development through the degeneration of Ficus leaves and compared with chlorophyll and carotenoid synthesis.

1. The plastidquinone content of Ficus chloroplasts increases steadily with increasing age of leaf tissue. The augmentation of the plastidquinone level is mainly due to the synthesis of the reduced quinone forms plastoquinol 45 (Plastohydrochinon 45) and a-tocopherol, the chromanol of α-tocoquinone. In several years old leaves the concentration (moles) of plastoquinol 45 and α-tocopherol reaches or exceeds that of chlorophyll a.

2. The naphthoquinone vitamin K1 (phylloquinone) as well as the oxidized quinone forms (α-tocoquinone and plastoquinone 45) seem not to be produced in excess amounts. The levels of the latter increase, however, in older and senescent leaves, apparently by oxidation of some α-tocopherol and plastoquinol 45 respectively.

3. The production of excess plastidquinones starts very early during leaf development. The main synthesis phase begins after the end of chlorophyll and thylakoid synthesis and continues in senescent Ficus leaves during the breakdown of chlorophyll until the early yellow stage.

4. The young pale green leaves still rolled up within the buds, possess a quinone and carotenoid composition which is quite different from that of fully expanded leaves. It resembles that of shortly illuminated etiolated seedlings.

5. The carotenoid level of older fully grown Ficus leaves slowly increases, mainly by synthesis of lutein. These additional carotenoids represent excess amounts, which are deposited together with the excess plastidquinones in the plastoglobuli of the plastid stroma.

6. There is no indication for a re-incorporation of excess plastidquinones in the general chloroplast metabolism. Thus the excess plastidquinones, accumulated in the osmiophilic plastoglobuli, may be regarded as secondary plant products.
Nucleinsäuren in chloroplasten.
Authors: Ruppel Hans Georg
Published: March 2015

Chloroplasten-Ribosomen (67s) von Allium porrum besitzen eine niedermolekulare, einheitliche RNS-Komponente mit einer Sedimentationskonstanten von 5s. Die 5s-RNS der Chloroplasten-Ribosomen wird nach Chromatographie an methyliertem Serumalbumin mit einer höheren NaCl-Konzentration von der Säule eluiert als die entsprechende 5s-RNS der Cytoplasma-Ribosomen.

Auf Grund der gleichen Sedimentation und des einheitlichen Verhaltens bei Gelfiltration an Sephadex G-100 kann auf eine ähnliche wenn nicht gleiche Molekülgröße der 5s-RNS aus Cytoplasma- und Chloroplasten-Ribosomen geschlossen werden.

In grünen und etiolierten Pflanzen von Zea Mays werden neben Cytoplasma-Ribosomen auch Plastiden-Ribosomen nachgewiesen. Beide Ribosomenklassen besitzen neben ihren hochmolekularen RNS-Komponenten jeweils eine 5s-RNS.

Damit kann ganz allgemein gesagt werden, daß Plastiden-Ribosomen, unabhängig vom Entwicklungszustand der Plastiden, 3 RNS-Fraktionen besitzen: 5s, 16s, 23s.
Separation of poliovirus specific RNA structures by analytical gelelectrophoresis
Authors: Koschel Klaus
Published: March 2015

Die analytische Gelelektrophorese an Agarose-Polyacrylamidgelen gestattet eine Auftrennung der poliovirus-spezifischen RNS-Strukturen: Einzelstrang-RNS, doppelsträngige replikative Form (RF) und replikative Intermediatform (RI). Unter den verwendeten Bedingungen werden die RNS-Arten nach ihrer Molekülgröße getrennt. Auch in dieser Trennmethode zeigt sich die Inhomogenität der mehrsträngigen RI-Struktur.
Quantitative Treatment of the Function of Plastoquinone in Photosynthesis
Authors: Stiehl H. H. , Witt H. T.
Published: March 2015

I. The function of plastoquinone PQ in photosynthesis has been measured by absorption changes in the UV at 265 nm. These measurements have been refined by the application of the very sensitive repetitive pulse technique. The reduction and oxidation of plastoquinone in chloroplasts have been measured 1. in short flashes, 2. in long flashes and 3. in double flashes. The results can be described by the empirical equations 1 — 13.

II. A molecular mechanism for these reactions of plastoquinone is presented. Two electron chains are arranged parallel to each other in such a way that two chlorophyll-aII are in contact with a twin of PQ-PQ (see fig. 12).

Firstly, plastoquinone is reduced by chlorophyll-aII into PQ-— —PQ-. Secondly, the semiquinone PQ- — PQ- dimutates in a first-order reaction into PQ= and PQ. Thirdly, the free diffusion within the plastoquinone pool results at light reaction I in a conmutation of PQ=+PQ into two single PQ- molecules. These are oxidized via intermediates (cytochrome-f etc.) by chlorophyll-a1+. The conmutation is the rate limiting step of the overall reaction.

III. The theoretical treatment of the postulated molecular mechanism in II results in equations 14 — 31. These equations agree quantitatively with the experimental equations 1 — 13.

The postulated semiquinone twin PQ- — PQ- has been attributed to the as yet chemically unknown substance X-320 with absorption changes in the UV at 320 nm.

The reaction mechanism of PQ regulates the kinetics and reaction patterns of the whole electron transfer system from H2O to the endstanding electron acceptor.

The rate of reduction of the electron acceptor ferricyanide and the rate of O2-production from H2O have been calculated from the PQ-mechanism. These rates are in quantitative accordance with the measured rates of ferricyanide reduction and O2-production.
Über die Biosynthese der p-Aminobenzoesäure II. / Biosynthesis of p-Aminobenzoic Acid II.
Authors: Altendorf K. H. , Bacher A. , Lingens F.
Published: March 2015

Starting with a polyauxotrophic mutant 62-1 of Aerobacter aerogenes, which accumulates chorismic acid, a p-aminobenzoic acid deficient mutant was obtained by treatment with 1-methyl-3-nitro-1-nitrosoguanidine. The mutant was found to produce an intermediate of p-aminobenzoic acid biosynthesis not observed hitherto. This compound feeds one of two p-aminobenzoic acid deficient mutants of Escherichia coli. It becomes converted to p-aminobenzoic acid by heat treatment in aqueous solution.
Über die Abhängigkeit der relativen biologischen Wirksamkeit hochenergetischer Bremsstrahlen von der durchstrahlten Materieschicht / Dependence of the Relative Biological Efficiency of High Energy Bremssstrahlen on the Depth in a Phantom
Authors: Stähler F. , Zywietz F. , Ewert W. , Künkel H. A.
Published: March 2015

The Relative Biological Efficiency (RBE) of 6-GeV-bremsstrahlung on 3-days-old seedlings of Vicia faba was investigated with the Deutsches ElektronenSynchrotron. Dosimetry was carried out by means of the butanol-sensitized FeII/FeIII-reaction. In a Lucite-phantom we observed an increase of the RBE from 0,65 at the surface to values of about 2 at a depth of 40 cm. As changes of that order of magnitude are doubtless beyond the limits of the maximum experimental error we suppose that production of heavy particles by nuclear reactions such as (γ, n) or (γ, p) in deeper layers of matter might cause an increase of the linear energy transfer of the beam.
Metallkomplexe mit polymeren Liganden, V / Metal Complexes with Polymeric Ligands, V
Authors: Biedermann Hans-G. , Graf Wolfgang
Published: March 2015

Poly-1-vinyl-2-pyrrolidinone of various molecular weight forms with transition metal chlorides in specific mixtures of solvents the following complexes: [Me(II)Cl2(C6H9NO)2]100, [NiCl2(C6H9NO)1]100, [Co(C6H9NO)2]n, Me = Fe, Co, Ni, Cu, Zn, n = 220, 360, 6300.

The IR spectra and electrical conductivity measurements are discussed.
A Graph-theoretical Analysis of the HOMO-LUMO Separation in Conjugated Hydrocarbons
Authors: Gutman I. , Knop J. V. , Trinajstić N.
Published: March 2015

Graph-theoretical rules concerning the HOMO-LUMO separation in conjugated hydrocarbons are given. It has been found that a closure of odd-membered rings will not essentially change the HOMO-LUMO energy gap (ΔΕ). However, ΔΕ will be shifted down or up depending whether a (4m + 1)-or (4m + 3)-ring is closed. A closure of an even-membered ring increase the value of ΔΕ in the case of (4m + 2)- and decrease ΔΕ value in the case of (4m)-cycles if delocalized rings are formed. The effect is opposite if quinonoid rings are generated.
Spektralphotometrische Analyse von mehrstufigen Protolyse-Gleichgewichten über einheitliche Teilbereiche / Spectrophotometric Analysis of Multistep Protolyte-Equilibria by Means of Uniform Segments
Authors: Blume Rüdiger , Polster Jürgen
Published: March 2015

A method to analyze spectrophotometric titrations of one-step dissociation-equilibria is applied to titrations of polyelectrolytes with small pK-differences. As criteria for the spectrophotometric uniformity, absorbance and absorbance-difference-quotient diagrams are referred to. By means of these methods otherwise not determinable absorbance coefficients and pK-values of the uniform parts of the titration can be determined. The methods are demonstrated using the titration of o-phthalic acid and (1,2,4)-benzenetricarboxylic acid.
HBr-Quantenausbeute von mehrfach bromierten organischen Verbindungen in Methanol / HBr Quantum Efficiency of Brominated Organic Compounds in Methanol
Authors: Arnold G.
Published: March 2015

Polybrominated HBr-donors were irradiated with UV light of the wavelength λ = 257 nm and 290 nm in methanolic solution and methanolic spiropyran solution. The quantum efficiency of the generation of HBr has been determined and discussed. With spiropyran present in the irradiated solutions the results can be explained only by the assumption of an energy transfer process between spiropyran and HBr-donors.
Notizen: Reversible innerkristalline Redoxreaktionen von Schichtchalkogeniden / Reversible Intracrystalline Redox Reactions of Layered Chalcogenides
Authors: Schöllhorn Robert , Lerf Anton
Published: March 2015

Ternary solvated layer chalcogenides (Ax)x+(Solv)y[MX2]x- (1) may be oxidized to the binary compounds MX2. The reaction is reversible layered chalcogenides MX2 can be reduced by chemical or electrochemical means to solvated polyelectrolyte compounds 1.
Notizen: Synthese eines Peptids mit vermutlicher Wirkung des Wachstumshormon-freisetzenden Hormons (GH-RH) / Synthesis of a Peptide with Suggested Activity of Growth Hormone-Releasing Hormone (GH-RH)
Authors: Zech Karl , Voelter Wolfgang
Published: March 2015

A new synthesis for the tripeptide Pyr-Ser-Gly-NH,, with mutual GH-RH activity is described. Z-L-Pyr-OH is reacted with HO-NSu to the protected amino acid derivative Z-L-Pyr-ONSu. Further intermediates in the synthesis are Z-L-Pyr-L-Ser(Bzl)-OH and Z-L-Pyr-L-Ser(Bzl)-Gly-NH,.
Über die Hydratisierung eines α,β-ungesättigten Aldehyds / On the Hydration of an α,β-Unsaturated Aldehyde
Authors: Sommermeyer Klaus
Published: March 2015

N,N,N-Triethyl-N-[β-formyl-vinyl]-ammoniumperchlorat (1), a cationic α, β unsaturated aldehyde reacts with water at the carbonyl group. No addition was found to the olefinic double bound. This unusual behavior will be explained. The temperature dependence of the equilibrium constant measured by 1H NMR spectroscopy result in ΔH = —3.8 ± 0.5 kcal/Mol, ΔS30
°C = —20 ± 3 e. u.
Spektroskopische Untersuchungen zum Jahn-Teller-Effekt des Cu2+-Ions in Verbindungen vom Typ A2 CuL6, I / Spectroscopic Ivestigations with Respect to the Jahn-Teller-Effect of Cu(II) in Compounds of the Type A2CuL6, I
Authors: Friebel Claus
Published: March 2015

Structural relations between perovskite-related lattices of the type A2CuL6 and the perovskite compounds A2
(12) [BCu](6)L6 (1: 1 order in the octahedral sites, elpasolite type) are demonstrated by two examples, the compounds A,Cu(OH)6 [A = Ba, Sr] and Ba2CuF6. From the ESR spectra a coupling of Jahn-Teller-distorted Cu-ligand-octahedra in these compounds corresponding to a “disturbed” type of antiferrodistortive order can be deduced. This result is in agreement with recent X-ray structure determinations. The ligand field spectra of the hydroxocuprates(II) indicate tetragonally elongated CuO6-octahedra with very long axial distances. From the ESR investigations further conclusions can be drawn concerning structural differences between the Ba- and the Sr-compound [Sr2Cu(OH6)], the atomic parameters of which are still unknown.
Ternäre Erdalkali-Beryllium-Silicide und -Germanide mit AlB2-Struktur. Ternary Alkaline-Earth-Beryllium-Silicides and -Germanides of AlB2-Structure
Authors: May Nicosia , Müller Wiking , Schäfer Herbert
Published: March 2015

The new phases ABe0,75X1,25 with A = Ca, Sr, Ba and X = Si, Ge have been prepared. They crystallize in the AlB2-structure. The Be- and X-atoms are statistically distributed on the B-positions of this structure.
Complexes of Al(III) and Be(II) with Biguanide
Authors: Nandi S. D. , Banerjee P.
Published: March 2015

Three complexes of biguanide (C2N5H7) having the compositions [Be (C,Ν5Η6) OH · H2O], [Be (C2N5H7),] (OH)2, and [(C2N5H7)2Al(OC2H5)Cl] Cl have been synthesised and characterized by elemental analysis and IR spectra.
Sulfenylierung C H-acider Thion- und Dithiocarbonsäureester / Sulphenylation of C H-acidified Thione- and Dithiocarboxylates
Authors: Thimm Konrad , Voss Jürgen
Published: March 2015

Reaction of alkyl thione- and dithiomalonates and -benzoylacetates as well as alkyl thiobenzoylacetates with 2-nitrophenylsulphenylchloride yields disulphides by attack of the reagent at the thione sulphur atom whereas ethyl α-arylthio-B-hydroxy-cinnamate is obtained from ethyl β-hydroxy-cinnamate.
CaCuSb(Bi) und SrCuSb(Bi) - Ternäre Phasen im „aufgefüllten“ NiAs-(Ni2In)-Typ / CaCuSb(Bi) and SrCuSb(Bi) - Ternary Phases in the „Filled“ NiAs-(Ni2In)-Structure
Authors: Eisenmann B. , Cordier G. , Schäfer Herbert
Published: March 2015

The new compounds CaCuSb(Bi) and SrCuSb(Bi) were prepared and their structures determined. They crystallize in the „filled“ NiAs-(Ni,In)-structure.
Über die Reaktion von Thallium mit den dimeren π-Cyclopentadienyl-metall-tricarbonylen des Chroms und Molybdäns / About the Reaction of Thallium with the Dimer π-Cyclopentadienyl-metal-tricarbonyls of Chromium and Molybdenum
Authors: Behrens Helmut , Ellermann Jochen , Merbach Peter , Weps Peter
Published: March 2015

The complexes [π-C5Η5Μ(CO)3]3 (M = Cr, Mo) and Tl(π-C5H6)Cr(CO)3 have been prepared in quantitative yields by the reaction of [π-C5H5M(CO)3]2 (M = Cr, Mo) with metallic thallium. The reactions of Tl(π-C5H5)Cr(CO)3 with I2 and [π-Ο5Η5Cr(CO)3]2 are described.
Photoelektronenspektroskopische Untersuchungen an Bor-Verbindungen, IV1 / Ionisierungsenergien und Geometrie von Tetrazadiborinen Photoelectronspectroscopic Investigations on Boron Compounds, IV1 Ionization Energies and Geometry of Tetrazadiborines
Authors: Kroner Jürgen , Nölle Dieter , Nöth Heinrich , Winterstein Wolfgang
Published: March 2015

The photoelectron (PE) spectra of five boron-substituted derivatives of tetrazadiborine

are presented. They are discussed on the basis of a structural model (twist form of the ring system) which results from simple extended HÜCKEL calculations. Orbital energies calculated by the CNDO/S method agree quite well with observed ionization energies. According to these at least the first three bands correspond to ionizations from π-orbitals. Evidence for strong π-interactions can be deduced by comparison with PE spectra of diaminoboranes.
Spectral and Magnetic Properties of Dithiocyanato bis (Biguanide) Chromium(III) Thiocyanate
Authors: Syamal A.
Published: March 2015

A reinvestigation of the title compound is reported. The compound has been prepared by a modified method and characterised by infrared spectra, electronic spectra and magnetic susceptibility measurements. The infrared spectral data suggest that the two coordinated thiocyanate ions are bonded to chromium(III) through N atoms rather than the S atoms. The complex exhibits two ligand field bands at 20410 and 26660 cm-1 due to the transitions 4A2g → 4T2g and 4A2g → 4T1g (F) respectively. Electronic spectral and magnetic moment data suggest that the complex has an octahedral structure with d2sp3 bonding.
Organische Schwefelverbindungen, X / Organosulfur Compounds, X
Authors: Höhne Gerhard , Marschner Freimut , Praefcke Klaus
Published: March 2015

The photoelectron spectroscopic investigation of the unconjugated spiroketone of 1,3-oxathiol (1) shows that there is no significant interaction between the carbonyl group and the hetero-π-system, whereas in the UV-spectrum of this compound a long-wave band is measured, which can be assigned to an intramolecular charge-transfer and which causes the yellow colour of this aliphatic ketone.
Anwendung der Röntgen-Photoelektronenspektroskopie in der Phosphorchemie, II
Authors: Fluck E. , Weber D.
Published: March 2015

P2p binding energies and binding energies of other electrons in phosphorus(III) compounds, phosphonium salts and oxyacids of phosphorus and their salts are tabulated and discussed.
Benzodyazepine mit psychotroper Wirkung, X / Benzodiazepines with Psychotropic Activity, X
Authors: Bauer Adolf , Weber Karl-Heinz
Published: March 2015

Synthesis and several reactions of the N-aryl-1,4-benzodiazepine-mono-ones (8) are described. With the Sandmeyer-reaction of 3f, a substitution of the p-position of the N-phenyl ring may occur. The compounds exhibit only a slight action upon the central nervous system (CNS).
N-Alkyl-4.5.6.7-tetrabromisoindole / N-Alkyl-4,5,6,7-tetrabromo-isoindole
Authors: Kreher Richard , Herd Karl Josef
Published: March 2015

The reaction of N-alkyl-4,5,6,7-tetrabromo-isoindoline-N-oxides with acetic anhydrid/triethylamine is a convenient route for the preparation of N-alkyl-4,5,6,7-tetrabromoisoindoles, which can be isolated in crystalline form. The spectroscopic properties and chemical reactivity of the cyclic conjugated heterocyclic 10π-electron system towards dienophiles has been examined.
Notizen: Kinetics of the Oxidation of Acetaldehyde by Manganese(III) Sulphate
Authors: Murdia M. S. , Shanker R. , Bakore G. V.
Published: March 2015

Oxidation of acetaldehyde with manganese(III)- sulphate is first order with respect to acetaldehyde and the oxidant. The rate is independent of acidity (2.0 > [H+] < 5.0 ᴍ and initial [Mn(II)]. Formaldehyde is one of the products of oxidation. Activation parameters for the reaction have been evaluated. The rate of enolisation under similar conditions is less than the rate of oxidation. A mechanism involving a direct attack on the aldehyde by Mn(III) has been suggested.
Notizen: The Fluorine-19 NMR Spectrum of Methylthiotetrafluorophosphorane
Authors: Johannesen Rolf B. , Peake S. C. , Schmutzler R.
Published: March 2015

The low-temperature 19F NMR spectrum of the stereochemically non-rigid compound, CH3SPF4, shows three fluorine environments, one for the equatorial and two for the nonequivalent axial fluorine atoms. Each of the twelve lines of the upfield 19F- (axial) resonance shows further fine structure, due to coupling between 19F and the protons of the CH3S group. The center peaks of the two multiplet components reveal apparent quintet structure which, based on a computer simulation of the 19F spectrum of CH3SPF4, is rationalized in terms of accidental overlap of two quartets.
Notizen: Characterisation of Pairs of Isomeric Bisaminohexachlorocyclotetraphosphazatetraenes
Authors: Keat R. , Krishnamurthy S. S. , Sau A. C. , Shaw R. A. , Rao M. N. Sudheendra , Murthy A. R. Vasudeva , Woods M.
Published: March 2015

The isolation of three pairs of isomeric bisaminohexachlorocyclotetraphosphazatetraenes, N4P4Cl6R2 (R = NHBut, NHEt, NMePh) is described. Structures are proposed for the derivatives on the basis of 81P NMR data.