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Copper(I) Bromide Promoted Reaction Of Grignard Compounds With Propiolaldehyde Diethyl Acetal. An Efficient Synthesis Of Allenic Ethers And α,β-ethylenic Aldehydes

G. Tadema, P. Vermeer, John Meijer, Lambert Brandsma
Published 2010 · Chemistry
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Interaction between ethereal solutions of Grignard compounds RMgBr and propiolaldehyde diethyl acetal I in the presence of copper(I) bromide gives allenic ethers, III. Acid hydrolysis affords trans-α,β-ethylenic aldehydes, IV, in good to excellent yields.

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