Abstract
Abstract Ionic liquids (ILs) are suitable media for the Co 2 (CO) 8 -catalysed intramolecular and intermolecular Pauson–Khand (PK) annelation, provided that the reaction is carried out under a CO pressure of 10 bar. Two diethyl allyl propargyl malonates were quantitatively converted into the relevant cyclopentenones, whereas heteroatom tethered enynes gave lower yields in their cyclocarbonylation products. A moderate yield in the corresponding Pauson–Khand product was obtained reacting phenylacetylene with norbornene.
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