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The instability of α-monosubstituted selenothioesters 6 was in sharp contrast to that of α-disubstituted esters 7. For example, during the purification of 6 (R = cyclohexenyl, R′ = n-Bu) through silica gel column, the deep purple color of 6 gradually turned yellow to give a complex mixture, whereas ester 7c could be stored in the refrigerator at least for one month.
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The instability of α-monosubstituted selenothioesters 6 was in sharp contrast to that of α-disubstituted esters 7. For example, during the purification of 6 (R = cyclohexenyl, R′ = n-Bu) through silica gel column, the deep purple color of 6 gradually turned yellow to give a complex mixture, whereas ester 7c could be stored in the refrigerator at least for one month.
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