In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Computed Properties of C7H12O2, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 105-21-5, name is Gamma-heptalactone. In an article，Which mentioned a new discovery about 105-21-5
Palladium chloride catalyzed reaction < room temperature, one atmosphere > of primary, secondary, and tertiary allylic alcohols with carbon monoxide and oxygen, hydrochloric acid, and cupric chloride in tetrahydrofuran affords five-membered ring lactones.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem