Safety of 4,4-Dimethyldihydrofuran-2,3-dione, Chemical engineers work across a number of sectors, processes differ within each of these areas, but chemistry and chemical engineering roles are found throughout, and are directly involved in the manufacturing process of chemical products and materials.
Triphenylphosphine-carbon tetrahalide reagent reacts with 4,4-dimethyloxolan-2,3-dione to afford two dihalomethyleneoxolanes, 8 and 9.The major reaction course can be changed by the addition order of the reagents.Reaction mechanisms are discussed.
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Reference：
Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem