Browsing by Autor "Klaus Peseke"

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    Push‐pull‐Butadiene. VIII. Reaktionen von substituierten Penta‐1,4‐dien‐1,1,5,5‐tetracarbonitrilen
    (Wiley, 1987) Klaus Peseke; Manfred Michalik; U. Schönhusen; José Quincoces; R. Radeglia
    Push‐pull‐Butadienes. VIII. Reactions of Substituted 1,4‐Pentadiene‐1,1,5,5‐tetracarbonitriles 4‐Aryl‐2‐methylthio‐1,4‐pentadiene‐1,1,5,5‐tetracarbonitriles 1 react with bromine to give the nicotinonitriles 2 . Compounds 2 and hydrazine hydrate yield the pyrazolo[3,4‐b]‐pyridines 7 . Bis(methylthio)nicotinonitriles 9 are prepared by the treating of 2 with methanethiol in an alkaline solution. Compounds 1 can be converted with hydrobromic acid or hydrochloric acid to the nicotinonitriles 2a‐‐c and 2d‐‐f , respectively.
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    <sup>1</sup>H‐NMR‐spektroskopische Untersuchungen zur Stereochemie von Butadienderivaten
    (Wiley, 1983) Nilo Castañedo; Klaus Peseke; H. Kelling; Manfred Michalik
    1 H‐N.M.R. Spectroscopic Investigations on Stereochemistry of Substituted Butadienes The butadienes 1–6 , obtained by Knoevenagel condensation of furfuryliden, 5‐bromofurfuryliden, and benzylidenaceton with malononitril and ethyl cyanoacetat respectively, have been investigated 1 H ‐n.m.r. spectroscopically. Structure and configuration of the isomers could be determined with the help of deuteration experiments, anisotropy effects, and Eu(fod) 3 shift reagents measurements.