Treatment of 19β-hydroxyolean-11,13(18)-dien-3β-yl acetate with boron trifluoride etherate yields 11-oxo-α-amyrin acetate, together with olean-9(11),12,18-trien-3β-yl acetate and an unidentified trienyl acetate.
R. Leonard and J. B. Thomson, J. Chem. Soc., Chem. Commun., 1972, 1281b DOI: 10.1039/C3972001281B
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