Abstract
Dehydration of methyl glycyrrhetate (VI) and β-amyrin with PCl 5 and with Fuller's earth afforded ring-A contracted products in which double bond migrations may occur. HI-induced dehydration of VI afforded a conjugated enonene 18α derivative. Solvolysis of VI sulphonate esters under a variety of conditions gave a number of ring-A contracted and uncontracted products in which the new ethenoid linkage was mostly confined to ring A.
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