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Synthesis 1985; 1985(9): 871-873
DOI: 10.1055/s-1985-31366
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2-Cyclopropen-1,1-dicarbonsäure- und Bicyclo[1.1.0]butan-2,2-dicarbonsäure-diester

Günther Maier* , Bernd Wolf
  • *Institut für Organische Chemie der Universität Gießen, Heinrich-Buff-Ring 58, D-6300 Gießen, Bundesrepublik Deutschland
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Publication Date:
27 September 2002 (online)

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2-Cyclopropene-1,1-dicarboxylic and Bicyclo[1.1.0]butane-2,2-dicarboxylic Diesters Cyclopropenation of bis[trimethylsilyl]-acetylene with diazomalonic esters affords 2,3-disilylated cyclopropene-1,1-dicarboxylic esters which are desilylated to 2-cyclopropene-1,1-dicarboxylic esters by treatment with potassium fluoride/crown ethers in acetonitrile. Two independent routes to silylated and non-silylated bicyclobutane-2,2-dicarboxylic esters are described.