5-(Tetrahydro-2-furyl)pentanoic trifluoroacetic anhydride reacts in the presence of trifluoroacetic acid to yield 6-trifluoroacetoxy-9-nonanolide together with (E)-non-5-en-9-olide; treatment of the same mixed anhydride with titanium(IV) chloride gives 6-chloro-9-nonanolide, and its reaction with trifluoroacetic acid in the presence of sodium iodide leads to 6-iodo-9-nonanolide.
5-(四氢-2-
呋喃基)
戊酸三氟乙酸酐在
三氟乙酸存在下发生反应,生成 6-三
氟乙酰氧基-9-
壬醇内酯和 (E)-壬-5-烯-9-醇内酯;将相同的混合酸酐与
氯化
钛(IV)处理,可生成 6-
氯-9-
壬醇内酯,其与
三氟乙酸在
碘化钠存在下发生反应,可生成 6-
碘-9-
壬醇内酯。