In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Computed Properties of C4H4O3, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 4971-56-6, name is Furan-2,4(3H,5H)-dione. In an article，Which mentioned a new discovery about 4971-56-6
New cycloaddition has been established for the synthesis of indoline-spiro benzofurodiazepine derivatives. Those reactions were conducted by reacting readily available and inexpensive starting materials, such as benzene- 1,2-diamines, tetronic acid and indoline-2,3-diones, in aqueous solution under microwave irradiation. When mono-substituted benzene-1,2-diamines as an amine component was employed, the reaction regioselectively resulted in the poly-functionalized indoline-spiro benzofurodiazepine with good yields. The present green synthesis shows attractive characteristics such as the use of water as reaction media, concise one-pot conditions, short reaction periods, easy work-up/purification and reduced waste production without the use of any strong acids or metal promoters.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem