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  • 1
    Electronic Resource
    Electronic Resource
    Reactions between diisopropyl methylphosphonate and halides of divalent metal ions (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 267-279 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metall(II) Halogenide reagieren mit Diisopropyl Methylphosphonat (DIMP) bei 150-220°C unter Bildung der folgende Komplexe: M[(C3H7O)CH3POO]2 (M = Fe, VO); M2[(C3H7O)CH3POO]2[OOP(CH3)-O-P(CH3)OO], (M = Ca, Mn, Co Ni); Zn[OOP(CH3)-O-P(CH3)OO]; Cu[CH3POO(OH)]3 (aus CuCl2 · 2 H2O + DIMP); Cu[CH3PO3] (aus CuX2 + DIMP; X = Cl, Br). Diese Komplexe wurden mittels Elektronen- und Infrarot-Spektren und magnetischen Messungen charakterisiert.
    Notes: Metal(II) halides react -with diisopropyl methylphosphonate (DIMP) at 150-220°C with formation of the following complexes: M[(C3H7O)CH3POO]2 (M = Fe, VO); M2[(C3H7O)CH3POO]2[OOP(CH3)-O-P(CH3)OO], (M = Ca, Mn, Co Ni); Zn[OOP(CH3)-O-P(CH3)OO]; Cu[CH3POO(OH)]3 (from CuCl2 · 2 H2O + DIMP); Cu[CH3PO3] (from CuX2 + DIMP; X = Cl, Br). These complexes were characterized by means of their electronic and infrared spectra and magnetic susceptibilities.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713840312
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  • 2
    Electronic Resource
    Electronic Resource
    Utilisation d'ylides du phosphore en chimie des sucres VIISuite de la série «Utilisation d'ylides de phosphore non stabilisés en chimie des sucres». Communication précédente v. [3].. Synthèse de sucres ramifiés des types «streptose» et «apiose». Communication préliminaireUne communication plus détaillée est destinée à paraître dans cette revue. (1971)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 687-691 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new high-yielding route to branched-chain sugars of the streptose or the apiose type having at the branching point a configuration epimeric with that which would be obtained by the classical synthesis using Grignard reagents is described. The main steps are the preparation of branched-chain unsaturated cyano sugars by reaction of cyanomethylene triphenylphosphorane with keto sugars and the cis-dihydroxylation (KMnO4) of the so obtained cyano sugars. The cis and the trans isomers of a series of cyanovinylidenic sugars have been separated and the stereodependence of the long-range coupling constants in this class of compounds has been examined.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19710540227
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Struktur eines neuartigen Indolalkaloids, des Talbotins. 141. Mitteilung über Alkaloide [1]Herrn Dr. O. Isler, Basel, zum 60. Geburtstag gewidmet (1971)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 15-43 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From the leaves of the African Apocynacea Pleiocarpa talbotii Wernham a novel indole alkaloid, talbotine, C21H24N2O4, has been isolated. Talbotine (1) contains a secondary N(b)-atom and a cyclic hemiacetal group. Catalytic hydrogenation leads to 19, 20-dihydrotalbotine (6), hydrogenation in the presence of formaldehyde gives N(b)-methyl-19, 20-dihydrotalbotine (8). In the presence of sodium methoxide and methanol, 1 is converted into the lactone 12 and the methyl ester 13. In these reactions carbon 17 is lost as formic acid. These data, together with the analyses of the NMR. spectra of talbotine and its derivatives as well as the interpretation of the various types of the mass spectral fragmentation, lead to formula 1 for the alkaloid.Dehydrogenation of talbotine methyl ether (3) with palladium and maleic acid gives the ß-carboline derivative 26. The N(b)-methiodide of the latter is converted into N(b)-methyl-talbotine methyl ether on reduction with sodium borohydride. From these data as well as from the analyses of NMR. and IR. spectra the complete relative stereochemistry of talbotine could be derived. Application of the Horeau method to the nitrogen atom b of the methyl ether 3 on the one hand and to the hydroxyl group on C17 in N(b)-methyl-19, 20-dihydrotalbotine (8) on the other hand gives consistent results and establishes S configuration of centre 15.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19710540104
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  • 4
    Electronic Resource
    Electronic Resource
    Über Pterinchemie. 35. Mitteilung [1]. Herstellung von 6-aminomethyl-6-methyl-5,6,7,8-tetrahydropterin, ein Beitrag zur frage der Existenz von parachinoid-dihydropterinen (1971)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 811-818 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die erste Synthese eines 6, 6-disubstituierten Tetrahydropterins, nämlich des 6-Aminomethyl-6-methyl-5, 6, 7, 8-tetrahydropterins, wird beschrieben: Das durch Anlagerung von Blausäure an 6-Methyl-7, 8-dihydropterin entstandene 6-Cyano-6-methyl-5, 6, 7, 8-tetrahydropterin wird acetyliert, reduziert und anschliessend desacetyliert. Entgegen unserer Erwartung bildet das 6-Aminomethyl-6-methyl-tetrahydropterin bei der Oxydation durch Luftsauerstoff unter physiologischen Bedingungen kein Parachinoid-dihydropterin, sondern wird direkt zu 6-Methyl-7, 8-dihydropterin, Formaldehyd und Ammoniak abgebaut.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19710540305
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  • 5
    Electronic Resource
    Electronic Resource
    Gas chromatographic and mass spectrometric characteristics of some bicyclic thioketones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 297-301 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three bicyclic thioketones were examined by combined gas chromatography-mass spectrometry. Deuterium labelling was employed in the interpretation of the fragmentation processes in thiocamphor. Compared with the oxygen analogues, the thiones yielded on electron-impact a higher proportion of characteristic fragment ions containing the hetero-atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050307
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  • 6
    Electronic Resource
    Electronic Resource
    Reactions of 4-Benzylidene-3-methyl-5-oxopyrazoline, pyrazole blue, and rubazoic acid with GRIGNARD reagents (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 1143-1147 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: While 4-benzylidene-3-methyl-5-oxopyrazoline 1 and pyrazole blue 2 with GRIGNARD reagents gave 1,4-addition, rubazoic acid 3 gave 1, 2-addition on both sides with ethylmagnesium bromide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130621
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  • 7
    Electronic Resource
    Electronic Resource
    Relation between chemical Structure and Absorption Spectra of Monoazo Dyes containing the benzo(b)thiophene nucleus and its derivatives (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 1131-1138 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ultraviolet and visible absorption spectra of some azo dyes containing the benzo(b)-thiophene, benzo(b)thiophene-1,1-dioxide and 2,3-dihydrobenzo(b)thiophene-1,1-dioxide moieties are investigated in correlation to their molecular structure. It was found that the position of absorption bands depends upon the type of moieties attached to the azo centre.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130619
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  • 8
    Electronic Resource
    Electronic Resource
    The pyrolysis of neopentane at small extents of reaction (1971)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 3 (1971), S. 197-213 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrolysis of neopentane, at small extents of reaction, was studied by gas chromatography, in Pyrex reaction vessels between 450° and 530°C and in the initial pressure range 25-200 mm Hg. At initial time, this thermal decomposition can be essentially represented by a homogeneous long-chain radical mechanism. The rate constant of the unimolecular initiation process is approximately given by the expression \documentclass{article}\pagestyle{empty}\begin{document}$$k_{\rm 0} \simeq 10^{13} {\rm exp}\left({\frac{{50,000}}{{RT}}} \right){\rm mole}^{- {\rm 1/2}} {\rm .ml}^{- {\rm 1/2}} {\rm .s}^{- {\rm 1}}$$\end{document} The initial rate constant of the global reaction (order 3/2) is nearly equal to \documentclass{article}\pagestyle{empty}\begin{document}$$k_{\rm 1} + 10^{16.8} {\rm exp}\left({\frac{{82,000}}{{RT}}} \right){\rm s}^{- {\rm 1}}$$\end{document} This reaction is strongly inhibited by propene or isobutene and self-inhibited by the isobutene formed; an interpretation of all these inhibition phenomena of the neopentane pyrolysis is proposed. Our observations and conclusions, which have been summarized in communications during 1968 and 1969, are compared to those of other authors, particularly to the recent ones of Purnell and colleagues [13] and of Taylor and colleagues [14], [15].
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550030302
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  • 9
    Electronic Resource
    Electronic Resource
    Stereochemistry of nucleic acids and their constituents. X.For part IX of this series, see Sundaralingam and Arora.1 solid-slate base-slacking patterns in nucleic acid constituents and polynucleotides (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 175-219 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The base-stacking patterns in over 70 published crystal structures of nucleic acid constituents and polynucleotides were examined. Several recurring stacking patterns were found. Base stacking in the solid state apparently is very specific, with particular modes of interaction persisting in various crystalline environments. The vertical stacking of purities and pyrimidines in polynucleotides is similar to that observed in crystals of nucleic acid constituents. Only partial base overlap was found in the majority of the structures examined. Usually, the base overlap is accomplished by positioning polar substituents over the ring system of an adjacent base. The stacking interactions are similar to those found in the crystal structures of other polar aromatic compounds, but are considerably different from the ring-ring interactions in nonpolar aromatic compounds. Apparently, dipole-induced dipole forces are largely responsible for solid-state base stacking. It is found that halogen substituents affect base-stacking patterns. In general, the presence of a halogen substituent results in a stacking pattern which permits intimate contact between the halogen atom and adjacent purine or pyrimidine rings. Considering differences in the stacking patterns found for halogenated and nonhalogenated pyrimidines, a model is proposed to account for the mutagenic effects of halogenated pyrimidines.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360100113
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of chemical structure on the dynamic properties of sulfur-vulcanized, carbon black-reinforced natural rubber (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 1855-1868 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A comparison is made of the composition and properties of the different rubber vulcanizate networks obtained by varying the ratio of sulfur to sulfenamide accelerator and by the thermal aging of vulcanizates containing predominantly polysulfide crosslinks. It is concluded that the changes in network structure which can take place, for example, during the service life of natural rubber tires are not the direct cause of failures of the type associated with rubber fatigue at high temperatures. However, a reduction in the total number of crosslinks can accelerate failure by increasing the amount of heat generated during flexing. More stable networks giving improved resistance to fatigue at high operating temperatures are obtained by the use of higher ratios of accelerator to sulfur than are conventionally employed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1971.070150805
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