Unusual Regioselectivity in the Aldehyde Addition Reactions of Allenyl/Propargyl Zirconium Complexes Derived from γ-(2-Pyridyl) propargyl Ethers: Synthesis of …
Zirconium-mediated reactions of γ-(2-pyridyl) propargyl ethers with aldehydes afford α- hydroxyallenes selectively via the formation of allenyl/propargyl zirconium species. The reaction outcome is quite different to that of the reactions using propargylic ethers without a