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  • 1
    Electronic Resource
    Electronic Resource
    Decolourization of Crystal Violet induced by ultrasonic waves (1968)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 38 (1968), S. 130-136 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High frequency ultrasonic waves of frequency 1 Mc/s. have been employed to study the decolourization of dilute aqueous solution of crystal violet. The process is irreversible and the kinetic study shows it to be unimolecular one. The deaeration of the solution by nitrogen does not affect the rate of the decolourization. The addition of certain substances such as alcohol, acetone, ether, glycerine, dioxan and allylthiourea inhibits the decolourization to a considerable extent. Oxidation and subsequent destruction of the dye molecule has been found to be the cause of the fading of the dye solution.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19680380304
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  • 2
    Electronic Resource
    Electronic Resource
    Notiz über neue Synthesen von Δ5-B-Nor-cholesten (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 362-363 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990154
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Ageing on Coagulation Constants of ferric hydroxide sol (1965)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 30 (1965), S. 155-157 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: During slow coagulation of Ferric Hydroxide slo with NaCI and KCI, the ageing effect on the constants a, m, and n of BHATTACHARYA's equation, \documentclass{article}\pagestyle{empty}\begin{document}$$ 1/{\rm c} - {\rm a} = \frac{{\rm n}}{{\rm m}} \cdot {\rm t} + {\rm l/m} $$\end{document} has been studied. A decrease in the values of a, m and n has been found on ageing of the sol.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19650300308
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of γ-radiation on synthetic fibres-II irradiation in the presence of chemicals (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 7 (1969), S. 85-100 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polyester- und Polyamid-Garn wurden in Gegenwart von Chemikalien wie Ammoniak, Chlor, Methylmethacrylat, Vinylacetat und Acrylnitril mit kontrollierten Dosen von γ-Strahlen bestrahlt. Die physikochemischen sowie mechanischen Eigenschaften der bestrahlten Garne wurden untersucht. Die Ergebnisse zeigen, daß durch Bestrahlung in Gegenwart dieser Chemikalien merkliche Verbesserungen einiger wünschenswerter Fasereigenschaften möglich sind.
    Notes: Polyester and polyamide yarns have been irradiated under controlled doses of γ-rays in presence of chemicals like gaseous ammonia and chlorine as also methyl methacrylate, vinyl acetate, and acrylonitrile monomers. The irradiated monomers have been tested for some of the more important physico-chemical and mechanical properties. The results indicate that the improvements obtained in various desirable properties are of much higher order when irradiation is carried out in presence of the chemicals employed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1969.050070108
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  • 5
    Electronic Resource
    Electronic Resource
    Studies in effect of γ-radiation on synthetic fibres-I (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 6 (1969), S. 127-135 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Einwirkung von γ-Strahlen auf Polyester- und Polyamid-Garn in verschiedenen Dosen in Gegenwart sowie unter Ausschluß von Luft untersucht. Die Veränderung in den Fasereigenschaften wie Schmelzpunkt, relative Viscosität, Festigkeit und Farbstoffaufnahme wurde ermittelt. Die in dieser Arbeit gefundenen Ergebnisse zeigen, daß - obwohl mit höheren Strahlungsdosen die Faserstoffe beschädigt wurden - es mit kontrollierter Bestrahlung jedoch möglich ist, einige Fasereigenschaften ohne wesentlichen Faserabbau zu verbessern.
    Notes: Polyester and polyamide yarns have been exposed to γ-rays with varying doses of irradiation, both in vacuum and in the presence of air. The changes in such properties of the polymers as melting point, relative viscosity, tensile strength, and dye absorption have been investigated. The results of the present study indicate that, though with higher doses there is degradation of the polymer, under controlled conditions certain desirable properties of the fibre are greatly improved without affecting the mechanical strength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1969.050060112
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  • 6
    Electronic Resource
    Electronic Resource
    Spectrophotometric study of Co(II) - chrome azurol S chelate (1968)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 38 (1968), S. 125-129 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation of a red coloured chelate between divalent cobalt and tri sodium salt of sulpho-dichlorohydroxy dimethyl fuchson dicarboxylic acid (CAS) with λmax at 450 mμ has been reported. The composition of the chelate employing spectrophotometric method has been determined by the continuous variation, mole ratio and slope ratio methods. The chelate has a composition corresponding to Co(CAS)2 and is stable between the pH range 10.5 to 11.5. Stability constant of the chelate has been found to be (log K = 8.00) involving a free energy change of formation ΔG° = -11.0 K cals.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19680380303
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  • 7
    Electronic Resource
    Electronic Resource
    Bromide Alkoxides of Tantalum (1967)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 36 (1967), S. 24-28 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of tantalum pentaalkoxides (ethoxide, isopropoxide and tertiarybutoxide with acetyl bromide give the products: Ta(OEt)4Br; Ta(OEt)3Br2; Ta(OEt)2Br3 · MeCO2Et; Ta(OEt)Br4 · MeCO2Et; Ta(OPr1)4Br; Ta(OPr1)3Br2; Ta(OPr1)2Br3 · MeCO2Pr1; TaOBr3. MeCo2Pr1; Ta(OBut)4Br and TaOBr3 · MeCO2But. These products were found to be viscous liquids or solids. All these bromide alkoxides except the tertiarybutoxide derivatives were found to be soluble in benzene. The tetraalkoxide monobromide derivatives could either be distilled or sublimed unchanged under reduced pressure. The tetraalkoxide monobromide derivative was found to be dimeric in boiling benzene.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19670360104
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the polymerization of 3.3-bis-(chloromethyl)-oxacyclobutane with anhydrous aluminium chloride (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 108 (1967), S. 67-72 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die kationische Polymerisation von 3.3-Bis-chlormethyl-oxacyclobutan mit wasserfreiem Aluminiumchlorid wurde bei verschiedenen Temperaturen, Initiatorkonzentrationen und Polymerisationszeiten untersucht mit dem Ziel, höhermolekulare Polymere zu erhalten. Die Beziehung zwischen der Viskosität in Cyclohexanon und dem Molekulargewicht des Polymeren wurde bestimmt. Auf Grund der Resultate wird ein Mechanismus vorgeschlagen, welcher dem der Polymerisation mit BF3 ähnlich ist.
    Notes: The cationic polymerization of 3.3-bis-(chloromethyl)-oxacyclobutane with anhydrous aluminium chloride was studied varying the temperature, initiator concentration, and reaction time in order to get a polymer of high molecular weight. The viscosity-molecular weight relationship of this polymer was determined in cyclohexanone. A mechanism similar to that proposed for BF3 as initiator has been put forwarded in the light of experimental results obtained.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1967.021080104
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  • 9
    Electronic Resource
    Electronic Resource
    Organic compounds of niobium and tantalum. Reactions of niobium and tantalum pentaethoxides with glycols (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 351 (1967), S. 219-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neue Niob- und Tantalverbindungen der Typen (EtO)3M(glycol), (EtO)M(glycol)2 und M(glycol)3 wurden aus den Pentaäthoxiden und verschiedenen Glykolen (z. B. Butan-1.3-diol) hergestellt. Sofern in Benzol löslich, sind die Verbindungen darin dimer.
    Notes: Following three types of new compounds (EtO)3M(glycol), (EtO)M(glycol)2 and M(glycol)3 (where M is niobium or tantalum) were isolated by the reactions of niobium and tantalum pentaethoxides with various glycols (butane-1.3-diol, neopentyl glycol and hexane-1.6-diol). Molecular weights of the few soluble compounds show that they are dimeric in benzene.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673510312
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  • 10
    Electronic Resource
    Electronic Resource
    Organic derivatives of niobium and tantalum. Reactions of Niobium and Tantalum Pentaethoxides with catechol (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 353 (1967), S. 109-112 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Reaktion der Pentaähoxide von Niob und Tantal mit Brenzkatechin (B—H2) liefert die neuen Verbindungstypen (ÄtO)3M(B), (ÄtO)M(B)2 und M(B)3. Die Mono- und Dibrenzkatechin-Derivate tauschen ihre Äthoxygruppen mit t-Butanol unter Bildung der entsprechenden t-Butoxy-Verbindungen aus.
    Notes: Reactions of niobium and tantalum pentathoxides with catechol have been studied in different stoichiometric ratios and the following three types of new derivatives, (EtO)3M (Catechol); (EtO)M(Catechol)2 and M(Catechol)3 (M = Nb; Ta) have been isolated. The mono- and di-catechol derivatives interchange their ethoxide groups with tertiary butanol yielding the corresponding tertiary butoxide derivatives.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673530115
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