The α-methoxy-4-methoxybenzyl carbocation reacts with the solvent trifluoroethanolâwater (50 : 50 v/v) with a rate constant ks= 3 à 107 sâ1; ks increases by less than twofold when the carbocation is destabilised by replacement of the strongly electron donating α-OMe substituent by the strongly electron withdrawing α-CF3 substituent.
α-甲氧基-4-甲氧基苄基碳正离子与溶剂
三氟乙醇→
水(50:50 v/v)反应,速率常数ks= 3 × 107 s→1;当碳正离子通过强吸电子α-
CF3 取代基取代强给电子α-OMe 取代基而不稳定时,ks 增加不到两倍。