4971-56-6, Name is Furan-2,4(3H,5H)-dione, belongs to tetrahydrofurans compound, is a common compound. Formula: C4H4O3In an article, once mentioned the new application about 4971-56-6.
4-Methyleneoxetan-2-one (Diketene or DK) consists of a four-membered lactone ring adjacent to a methylene function. It can be used as a versatile precursor for the syntheses of wide range of heterocycles including fused and spiral biheterocycles. In this chapter, we try to cover the structural features and reactivity of DK, and underscore its applications as a flexible and useful synthon in the syntheses of four- and five-membered heterocycles as well as a wide variety of fused or spiro heterocycles. This chapter as part 1 is divided in accordance with the ring sizes and subdivided according to types, numbers, and arrangements of heteroatoms.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem