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.
当 9,9-乙二
氧基-6-甲
氧基羰基-5-
甲基-2-
氧杂双环[4.4.0]
癸烷-3-one 与
苯硒酸酐和
二氧化硒处理时,前者优先得到 4,5-
脱氢化合物(2 ) 以及少量的 5-甲酰基化合物 (3) 和 δ-内
酯环的收缩产物 (4),而后者仅以低产率产生 2。