Abstract
The following interconversions occur in weakly alkaline acidic, and aqueous alcoholic solution: protoaescigenin-3.22.24.28-tetraacetate -3.21.24.28-tetraacetate, protoaescigenin-3.21.24-triacetate -3.28.24-triacetate, and protoaescigenin-21-tiglic acid esters -28-tiglic acid ester. The transesterification is fastest in the alkaline medium and slowest in aqueous alcohol.

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