Intramolecular cyclization of dicobalt hexacarbonyl complexes of allyl propyl ethers on adsorbent surfaces. A convenient mode of preparation of 3-oxabicyclo[3.3.0]octenes and 4-hydroxymethylcyclopentenone derivatives

1. The intramolecular Khand-Pauson reaction is substantially accelerated when it is carried out on the surface of a Chromatographic adsorbent in the absence of a solvent. 2. A method has been developed for the preparation of substituted 3-oxabicyclo[3.3.0]-oct-5-en-7-ones, by cyclization of the dicobalt hexacarbonyl complexes of allyl propargyl ethers. 3. A novel cyclization reaction of dicobalt hexacarbonyl complexes has been found, which provides a convenient synthetic route to 4-hydroxymethylcyclopent-2-en-1-ones.