Reference of 4100-80-5, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.4100-80-5, Name is 3-Methyldihydrofuran-2,5-dione, molecular formula is C5H6O3. In a Article£¬once mentioned of 4100-80-5
On the regioselectivity of Wittig reactions with unsymmetrically substituted succinic anhydrides
Phosphorane ylids react readily with succinic anhydrides to give enol-lactones.With highly substituted succinic anhydrides, condensation occur at the less substituted carbonyl group, suggesting that the reaction is sterically controlled.This, however, is not the case in monosubstituted anhydrides where effects other than steric become dominant.Condensation of phosphorane 1a with methoxysuccinic anhydride occurs selectively at the carbonyl group adjacent to the substituent.Stabilization of the transition state through complexation between the oxygen atom of the substituent and an electron-deficient phosphorus of the ylid is proposed.Key words: cyclic anhydrides; Wittig reaction, regioselectivity; stabilized ylid.
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Tetrahydrofuran – Wikipedia,
Tetrahydrofuran | (CH2)3CH2O – PubChem