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  • 1
    Electronic Resource
    Electronic Resource
    NMR Study of Solid Phloroglucinol (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 362-366 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wide line NMR investigation of solid phloroglucinol has been made over the temperature range 77 °K to 400 °K at the radio frequency 7.5 Mc/s. It has been shown that the second moments (mean square width) of the spectra for the temperatures at which the lattice is effectively rigid, namely below 290 °K are consistent with the assumed model of phloroglucinol, thereby giving an NMR check of the molecular structure of the sample. The rotation of the molecule is observed at all temperatures above 290 °K and the correlation frequencies for molecular reorientation are found to be in excess of 105 Hz. The activation energy is found to be 23.04 kcal/mole.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150303
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Broad line proton magnetic resonance investigations on solid L-alanine: Crystal structure and molecular reorientations (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 443-448 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Broad line NMR investigations on solid L-alanine have been carried out over the temperature range 77°K to 493°K. A comparison between the observed and theoretical values of the second moment has been made, to provide check on the crystal structure and to study the molecular motions. Investigations reveal the presence of NH3 group motion at about 230°K. The activation energy for NH3 group rotation has been computed to be 7.19 ± 1.0 kcal/mole. The crystal lattice remains rigid below 230°K. There is a possibility of torsional oscillation of the CH3 group at about 352°K.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150310
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies of the Metal Chelates of some SCHIFF Bases derived from ethanolamine (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 843-849 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The SCHIFF bases, 4-(2-hydroxy-ethylimino) pentane-2-one (abbr. HEA) und 1-[N-(2′-hydroxyethyl)iminomethyl]-2-naphthol (abbr. HNA) form solid complexes with Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Cd(II) and UO2(II). The elemental analyses, molecular weight, magnetic moment values and electronic spectral data have been used to establish the stoichiometry and structures of these compounds. Based on the studies it is concluded that Co(II), Zn(II) and Cd(II) complexes of these SCHIFF bases display tetrahedral structures whereas Pd(II) complexes exhibit a square-planar configuration. Cu(II) complexes of HEA and HNA are tetrahedral. Ni(II) complexes of HEA and HNA were found to possess octahedral and tetrahedral configurations, respectively.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150506
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  • 4
    Electronic Resource
    Electronic Resource
    Single step synthesis of Fluorinated 4H-1,4-Benzothiazines as possible anticancer agents (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 153-156 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330139
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  • 5
    Electronic Resource
    Electronic Resource
    Potentiometric study on the composition and stability of acetylacetoneanthranilic acid (SCHIFF's base) Complexes of Zinc (II) and Palladium (II) (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 371-376 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The condensation of acetylacetone with anthranilic acid in presence of piperidine as the condensing agent gives acetylacetoneanthranilic acid SCHIFF'S base (H2AA) which forms complexes with Zinc (II) and Palladium (II). The dissociation constants of H2AA have been determined by interpolation at half n̄ values and also by algebraic method which give the values 4.85 and 8.25 at 30° ± 1 °C for the dissociation constants. The stability constants of Zinc (II) and Palladium (II) complexes have been determined adopting CALVIN and MELCHIOR'S extension of BJERRUM'S method and the values of log k1 are found to be 2.92 and 3.97 respectively at 30° ± 1 °C. In these complexes 1:1 metal-ligand stoichiometry is observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130222
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  • 6
    Electronic Resource
    Electronic Resource
    NMR Study of Solid p-Amino Benzoic Acid - structure and group rotation (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 251-257 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Broad line NMR investigations of solid p-amino benzoic acid reveal the presence of intramolecular motion in solid state. The spectra were recorded in the temperature range from 77°K to the melting point of the sample (459°K). A transition was observed at about 330°K. From the temperature dependence of the second moment, this transition has been assigned to the rotation of the NH2 group about the C—N bond.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150209
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear Magnetic Resonance Investigation of ortho, meta and para xylenes at low temperature (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 185-191 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton magnetic resonance spectra have been measured between 4°K and their melting points for solid ortho, meta and para xylenes. It is found that lattices of these xylenes become rigid at about 4.2°K. The internal rotation of CH3 groups is observed at all temperatures above 95°K causing spectral narrowing.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19743160203
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  • 8
    Electronic Resource
    Electronic Resource
    One pot Synthesis of 2-(3,4-Dimethoxybenzoyl)-3-methyl-4H-1,4-benzothiazines (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 109-112 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320114
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