t‐BuOK at −10 °C produces the corresponding 1‐aryl‐2‐halocyclopropenes, which react with cyclopentadiene to produce fairly good yield of [4+2]‐cycloaddition products with more than 90% of the endo‐isomer. The higher yield obtained from hexane medium then from methanol and ionic liquid demonstrates that the reaction is a nonpolar process.
在-10°C下用t -BuOK处理一系列1-芳基-2,2-二卤代
环丙烷,生成相应的1-芳基2-卤代环
丙烯,它们与
环戊二烯反应生成[4 + 2]的相当好的收率环加成产物具有90%以上的内聚异构体。从己烷介质获得的产率比从
甲醇和
离子液体获得的产率更高,表明该反应是非极性过程。