Aldehyde Addition to 1,3-Butadiyne-Derived Zirconacyclocumulenes: Stereoselective Synthesis of cis-[3]Cumulenols

作者: Xiaoping Fu , Yuanhong Liu , Yuxue Li

DOI: 10.1021/OM100287D

关键词:

摘要: The direct addition of aldehydes to zirconacyclocumulenes generated through the coupling reactions benzynezirconocenes with 1,3-butadiynes is achieved cleanly under controlled reaction conditions, which provids a highly stereoselective method for synthesis tetra-substituted [3]cumulenols. DFT calculations suggest that there an equilibrium between seven-membered zirconacyclocumulene (3) and less stable but more reactive five-membered α-alkynylzirconaindene (2) in process. aldehyde reacts zirconaindene intermediate cyclic SE2′ pathway afford cumulenol products after hydrolysis.

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