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Synthesis 1986; 1986(3): 216-218
DOI: 10.1055/s-1986-31621
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Cyanomethylen- und Nitromethylen-Derivate der Quadratsäure

Gunther Seitz* , Klaus Köhler
  • *Pharmazeutisch-Chemisches Institut der Philipps-Universität, Marbacher Weg 6, D-3550 Marburg/Lahn, Bundesrepublik Deutschland
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Publication Date:
20 August 2002 (online)

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Cyanomethylene and Nitromethylene Derivatives of Squaric Acid The Wittig-Horner reaction of diethyl cyanomethane phosphonate with various squaric acid diamides leads to novel push-pull substituted cyclobutenes 5, 6, and 7. In contrast, the diaminoquadrain 9, by way of nucleophilic substitution, yields the dianion 11. In addition the first synthesis of pseudooxocarbor anions with nitromethylene groups is described.