First, we considered the orbital phase among the bonds.8 Both the p and r orbitals in the C@C double bond are orthogonal and cannot interact with each other. However, they should be com- bined in-phase toward the electrophile as a result of the extended anomeric effect, since the p and r orbitals of the C@C double bond are donors and the vacant orbital of the electrophile /⁄E—su