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Keywords:

  • alkynes;
  • carbonyl compounds;
  • dienyl esters;
  • homogeneous catalysis;
  • rhodium
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Positive thinking: A cationic rhodium(I)/H8-binap complex catalyzes the chemo-, regio-, and stereoselective completely intermolecular [2+2+2] cross-trimerization of two aryl ethynyl ethers with both electron-deficient and electron-rich carbonyl compounds (see scheme; cod=1,5-cyclooctadiene). This reaction proceeded at room temperature to give aryloxy-substituted dienyl esters in good yields.