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In addition, the formation of 3 a from 6 seems to exclude a mechanism in which the oxonium intermediate of the 1,3-shift would be trapped by water, forming an ortho-ester-like intermediate that would rearrange to the enone see scheme below, unless two distinct mechanisms are in action for propargylic ethers and esters. This hypothesis is currently being investigated. equation presented at
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In addition, the formation of 3 a from 6 seems to exclude a mechanism in which the oxonium intermediate of the 1,3-shift would be trapped by water, forming an ortho-ester-like intermediate that would rearrange to the enone (see scheme below), unless two distinct mechanisms are in action for propargylic ethers and esters. This hypothesis is currently being investigated. equation presented at
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We would like to thank a referee for drawing our attention to the crucial issue of the formation of HSbF6, its form in solution and the role it might play under the reaction conditions
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