Abstract
Abstract When 9,9-ethylenedioxy-6-methoxycarbonyl-5-methyl-2-oxabicyclo[4.4.0]decan-3-one was treated with benzeneseleninic anhydride and selenium dioxide, the former yielded preferentially the 4,5-dehydrogenated compound (2) together with small amounts of the 5-formyl compound (3) and the contraction product (4) of the δ-lactone ring, while the latter produced solely 2 in a poor yield.
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