In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Product Details of 105-21-5, 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
Solid acid catalysis of tandem isomerization-lactonization of olefinic acids
The conversion of unsaturated acids to gamma-lactones is catalyzed by the solid sulfonic acid catalysts Amberlyst-15 and Nafion SAC-13 in refluxing chlorobenzene. For 3- and 4-enoic acids, in which double bond migration is not required for gamma-lactone formation, yields are 95-100%. For 5-, 6-, 9-, and 10-enoic acids, the lactone yield decreases from 95% to 25% as the distance between the olefin and carboxylic acid groups increases. Amberlyst-15 is the preferred catalyst in these reactions because of its lower cost and reusability.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem