, transition-metal-free, photocatalyst-free, and oxidant-free trifluoromethylation has been demonstrated. Triflicanhydride (Tf2O), being inexpensive and readily available, was chosen as the radical trifluoromethyl source. Thianthrene was used as a recyclable Tf2O-activating reagent, and a high-yielding and scalable trifluoromethylation reaction was achieved. Density functional theory and mechanistic
已经证明了一种有吸引力的、多功能的、操作简单的、可见光诱导的、无过渡金属、无光催化剂和无氧化剂的三氟甲基化。三氟甲磺酸酐 (Tf 2 O) 便宜且容易获得,被选为自由基三氟甲基源。噻蒽被用作可回收的 Tf 2 O 活化剂,实现了高产和可扩展的三氟甲基化反应。密度泛函理论和机理研究表明,可见光激发的自由基均裂过程参与了该反应,产生了关键的三氟甲基自由基中间体。
Catalyst-free electrochemical trifluoromethylation of coumarins using CF<sub>3</sub>SO<sub>2</sub>NHNHBoc as the CF<sub>3</sub> source
The introduction of a perfluoroalkyl moiety into dye molecules changes the properties of the compounds. The 4-perfluoroalkyl disazo dyes were more soluble in hexane and showed a better dichroism than the alkyl analogs. A novel methacrylate copolymer with a pendant naphthylene disazo dye containing a perfluorobutylsulfonyl group showed a slow relaxation behavior after corona poling. 7-Diethylamino-4-methyl-3-(perfluoroalkyl)coumarins were more stable than the non-perfluoroalkylated derivatives to UV irradiation. (C) 1999 Elsevier Science S.A. All rights reserved.