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note
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The possibility that intermediate 11 might form via a concerted [4 + 2] cycloaddition of 1 and TAS-vinylketene 2 cannot be excluded.
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The TBDMS siloxy alkyne 23 was prepared from allylacetylene by employing the method of Julia (see Supporting Information). In general, however, the use of TIPS derivatives is preferred because of their increased stability to purification and storage.
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44
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33947093389
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