4971-56-6, Name is Furan-2,4(3H,5H)-dione, belongs to tetrahydrofurans compound, is a common compound. COA of Formula: C4H4O3In an article, once mentioned the new application about 4971-56-6.
Stereochemical control for construction of steroidal side chains by kinetic protonation of tetronate derivatives is described.Kinetic protonation of the (22R)-tetronates (4 and 11) proceeded with the inversion of the stereochemistry at the C-22 position to afford the corresponding (22S)-tetronates (3 and 12), whereas the same treatment of 9a and 9b gave only a mixture of stereoisomers.Furthermore, isomerization of the double bond of 7a and 7b led to the formation of (20E)-olefin (8a) and (20Z)-olefin (8b) (84:16) with moderate stereoselectivity.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem