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  • 1
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2,3-Di(1-naphthyl)butadien-1,3 und 2,3-Di(2-naphthyl)butadiene-1,3 wurden durch Dehydrobromierung von 2,3-Di(1-naphthyl)1,4-dibrombutan bzw. 2,3-Di(2-naphthyl)1,4-dibrombutan unter Verwendung von Natriumethoxid in Dimethylsulfoxid als Dehydrobromierungsmittel synthetisiert. Die 2,3-disubstituierten 1,3-Diene wurden mit Ausbeuten von 70 bis 80% erhalten und charakterisiert. Die Polymerisation der beiden Diene mit Azobisisobutyronitril ergab Poly[2,3-di(1(bzw. 2)-naphthyl)butadien-1,3]. Die Polymere wurden charaktersiert.
    Notes: 2,3-Di(1-naphthyl)butadicne-1,3 and 2,3-di(2-naphthyl)butadiene-1,3 were synthesized by dehydrobromination of 2,3-di(1-naphthyl)1,4-dibromobutane and 2,3-di(2-naphthyl)1,4-dibromobutane, respectively, using sodium ethoxide in dimethyl sulfoxide as the dehydrobrominating agent. The 2,3-disubstituted dienes-1,3 were obtained in yields of 70 to 80% and were characterized. Polymerization of either of the two dienes with azobisisobutyronitrile gave poly[2,3-di(1(or 2)-naphthyl)butadiene-1,3]. The polymers were characterized.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 1 (1978), S. 304-306 
    ISSN: 0935-6304
    Keywords: Aromatic boronic acids ; Pinacol boronates ; Physical and chromatographic properties ; Mass spectra ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 333-337 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectra of a series of MgO-doped congruent LiNbO3 crystals were obtained with MgO concentrations up to 30 mol.%. Single crystals were successfully grown and no precipitates were discovered. The intensity, frequency and line width of the Raman phonons were studied as a function of doping percentage. An abrupt change was observed near the composition of 7.5 mol.% of MgO-doped LiNbO3 crystal. From the spectral changes it is proposed that Mg2+ replaces the mis-sited Nb5+ cation at Li sites first. When these mis-sited Nb5+ cations have been completely replaced, the Mg2+ cation then replaces the Li+ cation and creates vacancies at Li+ sites.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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