(CH3)3SiCF3 reacts with fluoro ketones in the presence of excess KF in CH3CN to produce alkoxides derived from formal addition of CF3- to the carbonyl carbon. These alkoxides may be isolated as such or acidified to the corresponding alcohols. Ketones to which this technique was applied include (CF3)2C = O, CF3C(O)CF2Cl, CF3C(O)CF2H, and [(CF3)2CF]2C = O. The last compound reacts with replacement of one of its perfluoroisopropyl groups by CF3. With 2 equiv of TMS-CF3, the acid fluorides RC(O)F (R = CF3CF2, n-C3F7, n-C7F15) yield products of the form RC(CF3)2OX (X = K, H) due to both substitution and addition of CF3 at the carbonyl. Similarly, F2C = O with 3 equiv of TMS-CF3 provides a novel and high-yield synthesis of the perfluoro-tert-butoxide group. Phosgene does not appear to react directly with the TMS-CF3/KF system, but is converted first to F2C = O. The intermediate ketone CF3CF2C(O)CF3 is observed in reactions of equimolar amounts of CF3CF2C(O)F and TMS-CF3.
在 CN中加入过量的KF,(
CH3)3Si 与
氟酮反应,生成羰基碳上形式上加成
CF3-的烷氧基。这些烷氧基可以以
游离酸的形式分离出来,也可以被酸化为相应的
醇类。此方法应用于多种
酮类,包括( )2C=O、 C(O)
CF2Cl、 C(O)
CF2H和[( )2CF]2C=O。其中,最后一个化合物反应时会将一个
全氟异丙基群被 取代。
使用2当量的TMS- ,酸
氟化物RC(O)F(R=
CF2、n-
C3F7、n-
C7F15)生成形式为RC( )2OX(X=K、H)的产物,这是由于 在羰基上的取代以及加成所致。类似地,F2C=O与3当量的TMS- 反应,可以得到一种新型且高产率的
全氟叔
丁基醚的生成方法。
光气似乎不会直接与TMS- /KF系统反应,而会首先转化为F2C=O。在研究等当量的
CF2C(O)F与TMS- 的反应时,观察到了中间体酮
CF2C(O) 的形成。