The reactivity of methyl 4, 5-epoxy-(2E)-pentenoate (2) toward various aromatic nucleophiles in the presence of boron trifluoride etherate was examined. When benzene derivatives possessing an electron-donating substituent were employed, meta-substituted benzenes attacked only the 4-position of 2, while ortho- or para-substituted benzenes simultaneously attacked the 4- and 2-positions of 2.
研究了甲基4, 5-环氧-(2E)-
戊烯酸酯 (2) 在
三氟化硼醚化物存在下对各种芳香核能体的反应性。当使用具有电子给体取代基的苯衍
生物时,间位取代的苯只攻击2的4位,而邻位或对位取代的苯则同时攻击2的4位和2位。