allylhomoallylethers do not undergo the expected ring closing metathesis reaction if ethyl vinyl ether is added to the reaction mixture. Instead, upon heating, a selective isomerization of the substrates to allyl vinyl ethers is induced. These then undergo a Claisen rearrangement to produce pent-4-enals.
如果将乙基
乙烯基醚添加到反应混合物中,
二烯丙基-和烯丙基高
烯丙基醚不会发生预期的闭环复分解反应。相反,在加热时,会诱导底物选择性异构化为烯丙基
乙烯基醚。然后这些经历克莱森重排以产生pent-4-enals。