Concepedia

A New Ruthenium-Catalyzed Hydrogen-Transfer Reaction:  Transformation of 3-Benzyl But-1-ynyl Ethers into 1,3-Dienes and Benzaldehyde

Kuo‐Liang Yeh, Ching‐Yu Lo, Heh‐Lung Huang, Rai‐Shung Liu

Journal of the American Chemical Society · 2002 · 52 citations · 15 references

DOI

Concepts

Abstract

We report a ruthenium-catalyzed reaction for various 3-benzyl but-1-ynyl ethers with suitable functionalities. Treatment of these substrates with TpRu(PPh3)(CH3CN)2PF6 (8.0 mol %) catalyst in 1,2-dichloroethane (80 degrees C, 12 h) afforded functionalized 1,3-dienes and benzyl aldehyde in good yields. This process is considered to be a tandem dealkoxylation and transfer hydrogenation. Deuterium-labeling experiments reveal that the migration of different hydrogen atoms proceeds regiospecifically. A plausible mechanism is proposed on the basis of the results of isotope experiment.

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