ウィッティヒ反応
Modified Wittig-Claisen tandem reaction is a cascade reaction that combines Wittig reaction and Claisen rearrangement together. The Wittig reaction generates the allyl vinyl ether intermediate that further participates in a Claisen rearrangement to generate the final γ, δ-unsaturated ketone or aldehyde product (Figure "Modified Wittig-Claisen tandem reactions").