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  • Inorganic Chemistry  (32)
  • Life and Medical Sciences  (17)
  • ASTRONOMY
  • SOLAR PHYSICS
  • Wiley-Blackwell  (49)
  • 1980-1984
  • 1975-1979
  • 1970-1974  (49)
  • 1971  (49)
Collection
Publisher
  • Wiley-Blackwell  (49)
Years
  • 1980-1984
  • 1975-1979
  • 1970-1974  (49)
Year
  • 1
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 2 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 383 (1971), S. 263-271 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In mixtures of 7 vol. acetonitrile and 3 vol. acetic acid, solutions or suspensions of copper(II) acetate can be reduced with hydrazine hydrate to solutions of copper(I) acetate. In this way, purely white copper(I) acetate can be isolated.Other copper(I) carboxylates can be prepared by reduction of copper(II) carboxylates or by reaction of solid carboxylic acids with copper(I) acetate.By adding acetyl chloride to solutions of copper(I) acetate in acetonitrile/acetic acid mixtures, solutions of chlorocuprates(I) are formed. From these, highly pure copper(I) chloride can be obtained.By adding alkali acetate or tetramethyl ammonium chloride to solutions of chlorocuprates(I), the pure compounds Cs3[Cu2Cl5], Rb2[CuCl3] and NMe4[Cu2Cl3] were obtained.
    Notes: In Mischungen von 7 Vol. Acetonitril und 3 Vol. Essigsäure lassen sich Lösungen oder Suspensionen von Kupfer(II)-acetat mit Hydrazinhydrat zu Kupfer(I)-acetat-Lösungen reduzieren. Daraus kann rein weißes Kupfer(I)-acetat isoliert werden. Weitere Kupfer(I)-carboxylate können analog durch Reduktion der Kupfer(II)-carboxylate oder durch doppelte Umsetzung einer festen Carbonsäure mit Kupfer(I)-acetat dargestellt werden. Bei Zugabe von Acetylchlorid zu Lösungen von Kupfer(I)-acetat in Acetonitril/Essigsäure-Mischungen entstehen Lösungen von Chlorocupraten(I). Daraus kann reinstes Kupfer(I)-chlorid gewonnen werden.Bei Zugabe von Alkaliacetat bzw. Tetramethylammoniumchlorid zu Chlorocuprat(I)-Lösungen werden Chlorocuprate(I) der Zusammensetzung Cs3[Cu2Cl5, Rb2[CuCl3] und NMe4[Cu2Cl3] in reiner Form erhalten.
    Additional Material: 3 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 288-296 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition metal manganates with spinel structure are prepared by joint decomposition of MnSO4 and MeSO4 (Me = Co, Zn, Cu, Ni) about 1000°C in the fused sodium potassium sulfate eutectic. Complete series of mixed oxides MexMn3-xO4+γ have been observed within the limits: Co: 0 〈 x 〈 3; Zn: 0 〈 x 〈 1,5; Cu: 0 〈 x 〈 1; Ni: 0 〈 x 〈 1. The compounds Co2.2Mn0.8O4 to Co1.9Mn1.1O4, ZnMn2O4, Zn1.25Mn1.75O4 may be prepared in high yield and as single-phase compounds. The oxygen deficit of the manganates has the limits 0,02 〉 γ 〉 -0.08. The lattice constants of the spinels are compared with literature dates.
    Notes: Durch gemeinsame Zersetzung von MnSO4 und MeSO4 (Me = Co, Zn, Cu, Ni) in der eutektischen K—Na-Sulfat-Schmelze bei Temperaturen um 1000°C sind grobkristalline Übergangsmetall-Manganate darstellbar. Dabei wurden lückenlose Reihen im Spinellgitter kristallisierender Mischoxide MexMn3-xO4+γ in folgenden Grenzen erhalten: Co: 0 〈 x 〈 3; Zn: 0 〈 x 〈 1,5; Cu: 0 〈 x 〈 1; Ni: 0 〈 x 〈 1. Folgende Verbindungen lassen sich mit definierter Zusammensetzung in guter Ausbeute darstellen: Co2,2Mn0,8O4 bis Co1,9Mn1,1O4, ZnMn2O4 und Zn1,25Mn1,75O4. Das Sauerstoffdefizit der Manganate lag zwischen 0,02 〉 γ 〉 -0,08. Die Gitterkonstanten der Spinelle werden mit Literaturangaben verglichen.
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Stabilitätskonstanten der Komplexe von Mn++, Fe++, Co++, Ni++, Cu++, Zn++, Cd++ und UO++2 mit 5, 7-Dichlor-, 5, 7-Dibrom- und 5, 7-Dinitro-8-hydroxychinolin und der entsprechenden N-Oxide sind in Dioxan/Wasser-Gemischen (75/25) bei 35°C in Gegenwart von 0,20 m Natriumperchlorat durch Titration nach Irving und Rossotti bestimmt worden. Eine mögliche Erklärung für die beobachtete Abhängigkeit der Stabilitätskonstanten der Komplexe bei Variation des Liganden und andererseits bei Variation des Metalls wird vorgeschlagen.
    Notes: The stability constants of complexes of Mn++, Fe++, Co++, Ni++, Cu++, Zn++, Cd++ and UO++2 with 5,7-dichloro-, 5,7-dibromo- and 5,7-dinitro-8-hydroxyquinoline and their corresponding N-oxides have been determined in 75 + 25 v/v dioxan + water medium at 35°C in presence of 0.20 M sodium perchlorate by pH-titration technique as given by IRVING and Rossotti. A possible explanation for the observed orders of the stability constants of the metal complex with the different ligands, and of the complexes of a particular ligand with different metal ions is also proposed.
    Additional Material: 1 Ill.
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  • 5
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isoquinoline-type Heterocycles from β-Amino Acids, 2. Stereospecific Syntheses of (±)-6.7-Dialkoxy-3-aryl-4-(methoxycarbonyl)-1.2.3.4-tetrahydroisoquinolines and their DerivativesMethyl (±)-3-amino-2.3-diarylpropionates (1) yield under the conditions of the Pictet-Spengler reaction 6.7-dialkoxy-3-aryl-4-(methoxycarbonyl)-1.2.3.4-tetrahydroisoquinolines (2). The cyclization proceeds stereospecifically both in the erythro- and threo-series. Reduction of the trans- and cis-3-aryl-4-(methoxycarbonyl)tetrahydroisoquinolines with lithium aluminium hydride leads to the corresponding 4-hydroxymethyl derivatives (3). According to n. m. r. studies, the 3-aryl-4-(methoxycarbonyl)tetrahydroisoquinolines in deuteriochloroform solution exist in a half-chair conformation with equatorial-pseudoequatorial substituents at C-3 and C-4 for the trans- and pseudoaxial methoxycarbonyl group for the cis-forms. In the trans-4-hydroxymethyl derivatives the substituents at C-3 and C-4 have axial-pseudoaxial orientation, whereas in the cis-compounds the hydroxymethyl group is pseudoaxial. In these cases the preferred conformations are stabilized by intramolecular OH…N bond formation.
    Notes: (±)-3-Amino-2.3-diaryl-propionsäure-methylester (1) liefern unter den Bedingungen der Pictet-Spengler-Reaktion 6.7-Dialkoxy-3-aryl-4-methoxycarbonyl-1.2.3.4-tetrahydro-isochinoline (2). Der Ringschluß vollzieht sich stereospezifisch sowohl in der erythro- als auch in der threo-Reihe. Die trans- und cis-3-Aryl-4-methoxycarbonyl-tetrahydroisochinoline werden mit Lithiumalanat zu den jeweiligen 4-Hydroxymethyl-Derivaten (3) reduziert. Nach den NMR-Spektren besitzen die 3-Aryl-4-methoxycarbonyl-tetrahydroisochinoline in Deuteriochloroform eine Halbsessel-Konformation mit äquatorial-pseudoäquatorialen Substituenten am C-3 und C-4 in der trans- bzw. mit pseudoaxialer Methoxycarbonylgruppe in der cis-Reihe. Bei den trans-4-Hydroxymethyl-Derivaten liegen die gleichen Substituenten axial-pseudoaxial, in der cis-Reihe liegt die Hydroxymethylgruppe pseudoaxial vor. In den beiden letztgenannten Fällen sind die bevorzugten Konformationen durch die innere OH…N-Bindung stabilisiert.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1967-1975 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Specifically 14C-Labelled 2-AllylpiperidineThe dehydration of 3-(2-piperidyl)propan-1-ol and of 1-(2-piperidyl)propan-2-ol (1 and 4) was reinvestigated. In each case the major product was 2-propenylpiperidine (5). An unequivocal synthesis of 2-allylpiperidine (3) is reported and the preparation of [2-14C]-3 is described.
    Notes: Die Dehydratisierung von 3-[Piperidyl-(2)]-propanol-(1) und 1-[Piperidyl-(2)]-propanol-(2) (1 bzw. 4) wurde erneut untersucht. In beiden Fällen war 2-Propenyl-piperidin-(5) das Hauptprodukt. Es wird eine eindeutige Synthese von 2-Allyl-piperidin (3) beschrieben, die zur Darstellung von [2-14C]-3 benutzt wurde.
    Additional Material: 2 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 2694-2701 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of 5-Hydroxy-3-phenyl-1-(3-methyl-1-isoquinolyl)pyrazoleAn X-ray crystal structure determination shows that the product of the reaction of methyl phenylpropiolate with 1-hydrazino-3-methylisoquinoline is 5-hydroxy-3-phenyl-1-(3-methyl-1-isoquinolyl)pyrazole. The crystal asymmetric unit contains two independent molecules.
    Notes: Die röntgenographische Strukturbestimmung weist das Produkt aus Phenylpropiolsäuremethylester und 1-Hydrazino-3-methyl-isochinolin (1b) als 5-Hydroxy-3-phenyl-1-[3-methylisochinolyl-(1)]-pyrazol aus. Die Kristalleinheit enthält zwei unabhängige Moleküle.
    Additional Material: 2 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3486-3497 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reinvestigation of the Products Obtained from the Complexes of tert-Butylacetylene with Palladium ChlorideThe structure of the compounds 3 and 4 obtained from the complexes 1 and 2 by treating with hydrogen or bromine were reinvestigated. For 3 and 4 now 1.2-dihydrofulvene structures are proposed. The previously proposed structures of type A and B were excluded. It was established that the fulvene obtained from 3 and HCl has a 1.3.6-tri-tert-butylfulvene structure. Chemical and spectroscopical supports for this new structures are reported.
    Notes: Die Struktur der aus den Komplexen 1 und 2 bei der Umsetzung mit Brom oder Wasserstoff erhaltenen Verbindungen 3 und 4 wurde neu untersucht. Diesen Verbindungen wird eine monocyclische Struktur mit 1.2-Dihydro-fulven-Gerüst zugeschrieben, was die früher vorgeschlagenen Formeln vom Typus A und B ausschließt. Demnach erwies sich 7 (aus 3 und Chlorwasserstoff) als 1.3.6-Tri-tert.-butyl-fulven. Chemische und spektroskopische Beweise zur Stütze der vorgeschlagenen Strukturen werden wiedergegeben.
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  • 9
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The morphology of the retinal pigment epithelium and photoreceptor cells has been studied in the common newt Triturus viridescens dorsalis by light, conventional transmission and scanning electron microscopy.The pigment epithelium is formed by a single layer of low rectangular cells, separated by a multilayered membrane (Bruch's membrane) from the vessels of the choriocapillaris. The scleral border of the pigment epithelium is highly infolded and each epithelial cell contains smooth endoplasmic reticulum, myeloid bodies, mitochondria, lysosomes, phagosomes and an oval nucleus. Inner, pigment laden, epithelial processes surround the photoreceptor outer and inner segments.The three retinal photoreceptor types, rods, single cones and double cones, differ in both external and internal appearance. The newt, rod, outer segments appear denser than the cones in both light and electron micrographs, due to a greater number of rod lamellae per unit distance of outer segment and to the presence of electron dense intralamellar bands. The rod outer segments possess deep incisures in the lamellae while the cone lamellae lack incisures. Both rod and cone outer segments are supported by a peripheral array of dendritic processes containing longitudinal filaments which originate in the inner segment. The inner segment mitochondria, forming the rod ellipsoid, arelong and narrow while those in the cone are spherical to oval in shape. The inner segments of all three receptor cell types also contain a glycogen-filled paraboloid and a myoid region, just outside the nucleus, rich in both rough and smooth endoplasmic reticulum. The elongate, cylindrical nuclei differ in density. The rod nuclei are denser than those of the cones, contain clumped chromatin and usually extend further vitreally. Similarly, the cytoplasm of the rod synaptic terminal is denser than its cone counterpart and contains synaptic vesicles almost twice as large as those of the cones. Photoreceptor synapses in rods and cones are established by both superficial and invaginated contacts with bipolar or horizontal cells.
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  • 10
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The adventitia of the crayfish heart is composed of cells that are separated from each other by an intercellular space about 280 Å wide. Desmosomes are present on apposing surfaces of adjacent cells. A basal lamina underlies the adventitia and consists of a dense, amorphous substance that contains numerous fine filaments.The myocardial cells are striated and an external lamina 0.1 μ thick is present on the surface of the plasma membrane. The nuclei and most of the cytoplasm, glycogen and mitochondria are located at the cell periphery. The myofibrils are composed of thick and thin filaments and confined to the core of the cell. A T system and a well-developed SR are present. Elements of these organelles form dyads at levels that correspond to the H bands, and triads at levels that correspond to the Z bands of the peripheral myofibrils. The relationship of the T tubules to the myofibrils is discussed.Locus cells exhibit a unique pattern of intracellular myofibrillar branching. They branch from a region which has a structure similar to the Z band material. The myofibrils radiate outwardly in various directions and form numerous cellular branches which form intercalated discs with adjacent myocardial cells. These discs are more complex than those observed in poikilothermic vertebrates but are simpler than those in mammals.An endocardium is lacking in the crayfish heart but interstitial cells are present in close association with the myocardial cells and neural elements. Terminal nerve processes deeply embedded in the myocardial cells are described.
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