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GC analysis of incomplete reaction mixtures led to thermally induced cyclization of remaining epoxide 3 and intermediates 7 and 10 in the GC inlet, thus leading to innaccurate measurements of selectivity.
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GC analysis of incomplete reaction mixtures led to thermally induced cyclization of remaining epoxide 3 and intermediates 7 and 10 in the GC inlet, thus leading to innaccurate measurements of selectivity.
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Our previous investigations indicate that epoxy alcohol cyclizations promoted by water are under kinetic control and that endo:exo regioselectivity does not change throughout the reaction; please see ref 21.
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Our previous investigations indicate that epoxy alcohol cyclizations promoted by water are under kinetic control and that endo:exo regioselectivity does not change throughout the reaction; please see ref 21.
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For a more detailed discussion of the difficulties associated with calculating rate constants for the reactions of 3, 10, and especially 7 directly from concentration versus time data, please see the Supporting Information.
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For a more detailed discussion of the difficulties associated with calculating rate constants for the reactions of 3, 10, and especially 7 directly from concentration versus time data, please see the Supporting Information.
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Other unidentified products were also observed during the cyclization of isolated 7, which account for nearly 30% of the consumption of 7 and explain the difference between k obs 3 and (k hydrolysis 7 + k 5 7). The same unknown compounds were observed in trace amounts in the cascade reaction of 3, where they constitute only about 1% of total concentration after three half-lives. These species were ignored in the kinetic analysis.
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Other unidentified products were also observed during the cyclization of isolated 7, which account for nearly 30% of the consumption of 7 and explain the difference between k obs3 and (k hydrolysis 7 + k 5 7). The same unknown compounds were observed in trace amounts in the cascade reaction of 3, where they constitute only about 1% of total concentration after three half-lives. These species were ignored in the kinetic analysis.
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