The Structural Determination of the Ozonides and Their Reaction with Stabilizel Phosphorus Ylides

The ozonides reacted with stabilized phosphorus ylides to give the α,β-unsaturated carbonylcompounds in high yield. The Z/E ratio is dependent on the substituent of the ozonide. Their possiblemechanism was described.     

Stereoselective Synthesis of(Z)-α-Alkylidene-γ-Butyrolactones via Pd-Catalyzed CO Insertion and Cyclization

Four new (Z)-2-phenoxymethylene-α-pentanolide derivatives and four (Z)-2-phenoxymethyl-2-penten-γ-lactone derivatives were prepared via Pd-catalyzed carbon monoxide insertion and intramolecular cyclization. All compounds were characterized by IR, 1H NMR, 13C NMR, MS spectra and elemental analysis. The plausible mechanism of the reaction was discussed.